فهرست مطالب مهدی قیصری

Due to water scarcity, it is impossible to utilize all irrigated cropland in arid and semi-arid areas. Therefore, dense cultivation with a drip irrigation system that delivers water directly to the plant's root zone is an appropriate choice to enhance water productivity. The objectives of the present study were to compare wheat yield and water productivity under two different water distribution patterns in the drip-tape irrigation system and surface irrigation in full irrigation and deficit irrigation levels. The experimental treatments consist of two irrigation systems (drip-tape (DT), and surface irrigation (SU)), and three different irrigation levels (a full irrigation level (W1), two deficit irrigation levels, the irrigation interval twice, and the same irrigation depth of W1 level (W2), applied half of the irrigation depth of W1 level at the same time (W3)). The SU was implemented in place with 100% efficiency to avoid runoff. The yield in full irrigation level in DT was 5338.4 kg/ha and in SU was 5772.8 kg/ha. Applying deficit irrigation in two irrigation systems has different effects due to various water distribution patterns. In the DT, the most yield reduction was in W2, and in SU was in W3. The highest water productivity in DT was observed in W3 with a 1.44 kg/m3 value. The highest water productivity in SU was observed in W2 with a 1.46 kg/m3 value. For each irrigation system, some type of deficit irrigation management is optimal.

Considering the plant's positive response to nitrogen, farmers consume nitrogen fertilizers as much as possible. Excessive consumption of nitrogen fertilizers imposes additional costs on farmers, environmental pollution and direct negative impact on human health. Therefore, it is important to determine the amount of nitrogen-nitrate in the soil, plant and irrigation water in order to use nitrogen fertilizers optimally. In addition, according to the nitrogen balance, the amount of nitrogen deficiency is calculated and given to the plant, therefore the overuse of fertilizer is avoided. Most of the usual methods for nitrate measurement are time-consuming and expensive, spectroscopic measurement (spectrophotometer) makes it possible to determine the amount of nitrogen-nitrate in each of the soil, water and plant in the shortest time, inexpensively and accurately. In this research, we introduced a quick method of measuring the amount of nitrate in each of the water, soil and plant. The results are presented in terms of practical units in the field and soil for farmers and students, including kilograms of nitrogen per ton of product and the amount of nitrogen given through irrigation or nitrogen available in the soil in kilograms per hectare.

The purpose of this study was to determine the yield potential of winter wheat (Triticum aestivum) in Isfahan province and the appropriate cultivation date in different regions of the province using the CSM-CERES-Wheat plant model. For this purpose, 63 main areas of wheat cultivation were selected and their soil information was entered into the model. The model was run using meteorological data for 63 soil profiles, 18 different planting dates and 15 common wheat cultivars in the province with agronomic management without water and nitrogen stress. Average biomass production potential in the study area was 26392.47± 780.99 kg ha-1, grain yield 11914.17±442.62 kg ha-1, water productivity (WP) 1.73±0.11 kg m-3 and irrigation water efficiency (WPi) was 2.49±0.30 kg m-3. WP of the eastern regions of Zayandehrud basin (Varzaneh, Kabutarabad and lenjanat) was 12.82% higher than the western regions (Fereydunshahr, Fereydan and Chadegan) and WPi for the western regions was 16.30% higher than the eastern regions. In western and northwestern regions of the province, the production portion of green water is 38.31% and in eastern regions of the province is 18.86%. therefore, it is recommended to use the capacity of green water under any conditions in the western and northwest regions in addition to planting on suitable dates. Planting dates varied for different regions depending on whether the goal was to maximize the yield or water productivity index. Suitable planting date was obtained as following: for Fereydan, Fereydunshahr and Chadegan regions 26 September to 15 October, Khansar and Tiran 26 September to 25 October, Golpayegan 5 October to 5 November, Lenjanat, Najafabad, Kabutarabad and Varzaneh 15 October to 25 November.

Investigation of homogeneity regions using univariate characteristics is an important step in the regional frequency analysis method. However, some hydrological phenomena have multivariate characteristics that cannot be studied by univariate methods. Droughts are one of these phenomena their definition as univariate will not be effective for risk assessment, decision-making, and management. Therefore, in this study, the regional frequency analysis of drought was studied in multivariate methods using SEI (Standardized Evapotranspiration Index), SSI (Standardized Soil Moisture Index), and SRI (Standardized Runoff Index) indices in the Karkheh River basin from 1996 to 2019. The indices calculated probabilistic distribution between the variables of evapotranspiration, runoff, and soil moisture using multivariate L-moments method and Copula functions and considered meteorological, agricultural, and hydrological droughts simultaneously. The results of multivariate regional frequency analysis considering the Copula Gumbel as the regional Copula showed that the basin is homogeneous in terms of severity of SEI-SSI combined drought indices and is heterogeneous in terms of severity of SEI-SSI combined drought indices. However, after clustering the basin into four homogeneous areas in terms of characteristics of SPI (Standardized Precipitation Index), the basin is homogeneous in all areas in terms of univariate SEI, SSI, and SRI indices and is heterogeneous in the third and fourth clusters of SRI and SSI drought indices. Pearson Type (III), Pareto, normal, and general logistics distribution functions were found suitable to investigate the characteristics of SEI, SSI, and SRI drought indices in this case. Finally, large estimates of the types of combined droughts and their probability of occurrence showed that the northern and southern parts of the Karkheh River basin will experience short and consecutive droughts in the next years. Droughts in areas without meteorological data can be predicted in terms of joint probability using the multivariate regional frequency analysis method proposed in this study.

Regarding the scarcity of water resources in Iran, management of planting dates and irrigation is necessary for wheat production. The goal of this study was to determine the effect of two planting dates of November (PD1) and February (PD2) and two irrigation regimes: traditional (T) and supplementary (W) on wheat yield and irrigation water productivity in the east of Isfahan. Field experiments were carried out during two consecutive seasons’ autumn and winter in the crop year of 2016-2017 in a clay loam soil. The results showed that planting date significantly affected wheat yield and water productivity (P < 0.01). Yield in PD1 was 11.5% higher than PD2, while water productivity in PD1 was 9.0% lower than PD2. Supplementary irrigation in clustering period had a significant effect on wheat grain yield. Comparison of crop evapotranspiration (ETc) calculated by FAO-Penman-Monteith method with that of applied irrigation water showed that the later in TPD1 and TPD2 treatments were, respectively, 40.0 and 19.9% more than the ETc. In traditional irrigation management (T), lack of coordinations between the supplied water and the timely water requirement based on ETc led to high water losses due to deep percolation and runoff. Supplementary irrigation regime on both planting dates significantly increased yield, with no positive effect on water productivity. We concluded that due to supply-oriented water management in the east of Isfahan, farmers use irrigation water more than what is needed for wheat yield production leading to less yield and much low water productivity than the potentials realizable in the region.

Subsurface leaky irrigation systems are one of the novel irrigation systems developed in recent years. In this system, the pipes are located below the soil surface and water is distributed in root zone with a very low pressure of less than one meter water column. This system can be widely used in small gardens with quantitative and qualitative water restrictions. Optimal design of these systems depends on the effect of different parameters on water infiltraion and wetting pattern. For this reason, the volume of water infiltration is investigated at different Subsurface leaky irrigation strategies. The inlet discharge and volume of applied water at each strategy differs from 0.1, 0.2 and 0.35 liters per second and 30, 60 and 90 liters, respectively. The humidity of the soil is also measured in wetting area at the end of each experiment. The results show that inlet discharge in feeding stage has dramatic effect on water infiltration, while the volume of applied water has more effects in discharg stage. Measurements of wetting pattern at the end of experiments also showed that water infiltration increased by 17% with increasing the inlet discharge into the system. The developed models in feeding phase and discharge and feeding phase in non-free surface flow had correlation coefficients of 0.69, 0.77 and 0.66, respectively, which show their higher accuracy in comparison with other phases.

The emitter clogging by crop roots is a main problem for using subsurface drip irrigation system in an arid area under water stress condition. The goals of this study were to investigate the effect of treflan injection for preventing of emitter clogging by grass roots in subsurface drip irrigation (SDI) and the effect of these treflan on the visual quality of two grass species. The experiment was conducted in a factorial experiment according to completely randomized block design with three replications from 2012 to 2013. The experiment included three levels of treflan contain 0 (C0), 100 (C1) and 300 (C2) mg net Treflan per emitter per year, and two grass species of Festuca (F) and Brmudagrass ( B). The results showed that the injection of Treflan into SDI system decreased roots around the emitter outlet and consequently no emitter clogging was observed. Root penetrate and severe clogging problem was more for Brmudagrass in compared to Festuca. The results showed after two growing seasons there was no emitters clogging in high Treflan level injection. Also, increasing the concentration of treflan up to 300 mg per year per emitter had not effect on the visual quality of grass species. Due to the importance of environmental protection, it is recommended to use a high-tech emitter and dripline for subsurface drip irrigation with no or lower herbicides injection to prevent clogging of the emitter.

Double Ring (DR) and Time of Ponding (TP) methods are two field methods for determining infiltration rate in the sprinkler irrigation system. However, the boundary conditions and the nature of the flow on the soil surface in the sprinkler irrigation system are different from the DR method. The aim of this study was to investigate the relationship between the measured infiltration intensity values with the double ring and ponding time methods in different soil textures. The first factor consisted of two methods and the second factor consisted of five soil textures in Isfahan province and the experiments were performed in three replications in the form of a factorial statistical design. The results showed that the infiltration intensity values obtained from the DR method were on average 2.7 times higher than the values determined in the TP method and the final infiltration values of the DR method were 5 times higher than those of the TP method. The difference of infiltration values was higher in the fields with coarser texture (sandy clay loam) and less in the field with clay loam texture. The maximum final infiltration rate was observed in the field with loamy sand soil texture and the minimum final infiltration rate was observed in the field with clay loam soil texture. The results indicate the need to adjust and correct the final infiltration of DR method in the design of sprinkler irrigation systems. It is suggested to use TP method to determine the infiltration velocity values for designing sprinkler irrigation systems. If DR method is used, it is recommended that the infiltration values be modified with the given development equations before application.

Given the potential of modern irrigation system, it is important to perform intelligently irrigation, or in other words, determine the time, place and amount of water in order to maximize water use efficiency in the face of water shortages. This study was conducted to examine the effect of different levels of soil suction threshold before irrigation and crop rotation on yield and water use efficiency of maize in loam soil under drip-tape irrigation system. The three irrigation management levels contain; irrigation based on ETC calculation using FAO-PM equation (W1), soil moistures suction levels of 40 kPa (W2), and 20 kPa (W3), and two crop rotation contains; fallow-maize (Nfal) and wheat-maize sequence (Nseq). Total biomass, and leaf area index during the growing season and grain yield at maturity stage were measured. The maximum total biomass, grain yield, and leaf area index were observed in NfalW3 treatment with 25 ton/ha, 12.6 ton/ha, and 5.3 m2/m2, respectively. The difference between water use efficiency and irrigation water use efficiency was lowest in the third level of irrigation management, indicating a precise irrigation based on the water requirement of the plant and reducing evaporation and penetration losses.

The present study aimed to evaluate the growth and water use efficiencies of eight late-maturing corn hybrids in comparison to the common use of KSC704 and Maxima-FAO530 under different water-nitrogen management systems. Two irrigation regimes (based on 50% soil-water depletion as the normal irrigation and, on average. 16% less than normal as the deficit irrigation) and two nitrogen (N) application managements (3 and 16 split-application of 150 kg N from Urea, 45% N) were induced using the split-split plot experiment based on a completely randomized block design with four replications at Research Field of Isfahan University of Technology on 2017. The results showed that yield, forage and leaf area index were significantly (P<0.01) affected by the interaction of three studied factors (Irrigation × Nitrogen × Corn hybrid). For different corn hybrids, more water use efficiencies were achieved by deficit-irrigation regime and 16- split-applyication of N; in this regard, the SC719 hybrid had the highest value of 3.45 kg m-3. Generally, the performances of the studied late maturing corn hybrids were higher than those of the control hybrids of SC704 and SC530 at this planting date, which could be improved by using the deficit-irrigation regime and more split-application of the N fertilizer.

Irrigation management is one of the most important factors affecting the maize growth. The purpose of this study was to investigate the impact of different furrow irrigation management on maize growth. This research was carried out as split plot in a randomized complete block design at Kabootarabad Research Station in Isfahan Province. The main factor included three levels of surface irrigation regime; I1 (100%), I2 (80%), I3 (60%) and the sub-factor included conventional, alternative and constant irrigation methods. The studied parameters were plant height, fresh and dry yield, leaf area and leaf area index, which were measured at five stages of maize growth. The results showed that the effect of different irrigation regimes and different types of furrow irrigation was statistically significant on forage maize properties at 1% level. The highest impact on growth properties was corresponded to I1 regime and conventional furrow irrigation and the lowest one was corresponded to I3 regime and constant alternative furrow irrigation. plant height, fresh and dry yield in conventional and standard irrigation were equal to190 cm, 63978 and 20830 kgha-1 respectively. The same traits in I3 irrigation regime and constant alternative furrow irrigation were obtained 116 cm, 33635 and 8053 kgha-1 respectively. Changing the conventional furrow irrigation to constant alternate furrow irrigation until the harvesting stage led to save water consumption 39.3% and water use efficiency was increased 37%. Generally, by executing deficit irrigation up to 20% in conventional furrow irrigation or by using alternative furrow irrigation, in addition of saving water consumption and increasing irrigation water use efficiency, a reliable yield can be produced.

Creation and conservation of urban parks is challenging in arid environments where daily thermal extremes, water scarcity, air pollution and shortage of natural green spaces are more conspicuous. Water scarcity in the arid regions of Iran is major challenge for water managers. Accurate estimation of urban landscape evapotranspiration is therefore critically important for cities located in naturally dry environments, to appropriately manage irrigation practices. This study investigated two factor-based approaches, Water Use Classifications of Landscape Species (WUCOLS) and Landscape Irrigation Management Program (LIMP), to measure the water demand in a botanic garden. The irrigation water volume applied was compared with the gross water demand for the period from 2011 to 2013. On average, WUCOLS estimated an average annual irrigation need of 1164 mm which is 15% less than the applied value of 1366 mm while the LIMP estimate of 1239 mm was 9% less than the applied value. Comparison of estimated and applied irrigation showed that a water saving of 9% can be made by the LIMP method. The outcomes of this research stressed the need to modify the irrigation requirements based on effective rainfall throughout the year, rather relying on long-term average data.

According to the limited clinical observations and researches on cutaneous complications and hair growth changes of donor's site extremities, this study aimed to compare hair growth changes and cutaneous complications of donor's site extremity in patients who underwent coronary artery bypass graft between diabetic and non-diabetic patients.

Patients who attended the heart surgical clinic for routine follow-up 3-6 months after CABG (coronary artery bypass grafting) were evaluated. Their donor's sites in both extremities were compared with each other. Cutaneous changes were assessed and recorded by a dermatologist. After recording data, the incidence of these complications and the differences between diabetic and non-diabetic patients were evaluated.

From the 97 participants of this study, 77 were male and 20 were female. Of these patients 29 were diabetic. Ten had hypertrichosis, 3 had hair loss in donor's site extremity, 16 had hyperpigmentation changes, 21 had itches, 26 had colloid scar changes, 3 had dermatitis, and 9 had wound site infection. In this study there was no statistically significant difference regarding the incidence of complications in diabetic patients compared to non-diabetic patients (P>0.05).

The cutaneous complications in this study were similar to previous studies and the only significant finding was the incidence of hypertrichosis in donor's site extremity. In order to determine the prevalence and persistence of the complications more accurately, further studies on larger populations including follow-up of complications are warranted.

Irrigation management is one of the important factors influencing the development and distribution of plant roots, which is considered by many researchers. The purpose of this study was to study the growth and distribution of corn root in various irrigation management systems. This research was carried out as a split plot in a randomized complete block design at Kabootarabad Research Station in Isfahan. The main factor was consisted of three levels of irrigation regime I1 (100%), I2 (80%), I3 (60%) and the sub-factor was included three irrigation methods, conventional, alternative and fixed furrow irrigation. The measured parameters of root were length, surface, volume, fresh and dry weight, which were carried out in 5 stages of plant growth including 9-leaf, 14-leaf, inflorescence emergence, milking and physiological examination. The results showed that the effect of irrigation regimes and the type of irrigation method on root traits was statistically significant at 5% level. The highest amount of root traits was corresponded to I1 regime and conventional furrow irrigation, and the lowest one was corresponded to I3 regime and fixed furrow irrigation. The highest amount of root traits was obtained in the soil layer of 0-20 cm for all regimes and irrigation methods. From the 9-leaf to the milky stage, the root traits had a bullish trend, then after constant and at the end of growing season declined. Generally, a suitable root system for absorption of water and nutrients required by the plant can be achieved by application of a deficit irrigation rate up to 20% in conventional furrow irrigation or alternative furrow irrigation, which leads to save water consumption.

Location of soil moisture sampling in irrigation management is of special importance due to the spatial variability of soil hydraulic characteristics and the development of root system. The objective of this study was determination of the suitable location for soil moisture sampling in drip-tape irrigation management, which is representative of the average moisture in the soil profile (θavg) as well. For this purpose, soil moisture distribution (θij) at the tassel stage of maize and one irrigation interval (68-73 day after plant) were measured at the end of season. The results showed more than 70% length of the root of plant was located in 30 cm of the soil depth. By accepting ±10% error in relation to the averaged soil moisture, some region of soil profile was determined which was in the acceptable error range and also near the averaged soil moisture (0.9θavg<θRec<1.1θavg). By overlapping θRec in one irrigation interval, the appropriate location for soil moisture sampling was the horizontal distance from drip-tape line to 20 cm and the depth of 10-20 cm from the soil surface. To determine the appropriate place for soil moisture sampling, the development of root system and the maximum concentrated root length density in the soil profile extracting the maximal soil moisture should be taken in to account, parallel with the averaged soil moisture.

There are different tools to formulate strategic plans in each organization. The SWOT matrix is one of these tools that helps managers in managing the programs by analyzing the external and internal factors of each organization. The purpose of this research was to identify the strengths, weaknesses, opportunities and threats in the Libraries, Museums and Documents Center of Astan Qods Razavi based on SWOT matrix and offer executive solutions to improve the programs.

This research is a descriptive-survey. A researcher-made questionnaire was used to collect data. The validity of the questionnaire was confirmed by using the expert opinions of the faculty members and its reliability was calculated by using Cronbach's alpha (amounted to %98). The statistical population of this research was all affiliated managers and employees of the library deputy in Libraries, Museums and Documents Center of Astan Qods Razavi. After collecting internal strengths and weaknesses and external opportunities and threats, these factors were placed in a separate table and component weight scores were calculated using a rated weighting method. Finally, after analyzing the factors, based on the importance and weight of each factor, appropriate research strategies were formulated and effective executive strategies were developed to strengthen strengths and opportunities and reduce weaknesses and threats.

The results showed that belonging to the Astan Quds Razavi Libraries, presence of educated and expert personnel and experienced managers were of the greatest strength. Lack of space and standard library buildings in some libraries, proper mechanisms for weeding old resources and general attitude to the necessity of research were important weakness of these libraries. The most opportunities were attention of supreme leader and respected custodian of Astan Quds Razavi to qualitative and quantitative development of these libraries, presence of educated staff and existence of a suitable scientific and research potential in this area and presentation of these libraries to educational and cultural centers, belonging the libraries to Imam Reza and variety of services made in these libraries and the most important threats were academic credentials, lack of interest in studying after graduation, and the environmental and economic problems of society.

The results showed that the libraries have many opportunities and strengths for being in an aggressive situation that by relying on them, can be directed toward the way of organizational goals, overcoming existing obstacles and strengthening their weaknesses.

Water and nitrogen fertilizer management is essential for increasing water productivity, increasing product production and reducing environmental hazards in modern irrigation systems. The aim of this study was to investigate the interaction of water and nitrogen fertilizer on total biomass (TB) and irrigation water use efficiency (IWUE) of silage maize under drip-tape irrigation system. Four irrigation levels, including two deficit irrigation levels (W1=0.86ETc, W2=0.93ETc), a full irrigation level (W3=ETc), and an over irrigation level (W4=1.06ETc) and three nitrogen fertilizer levels, including no nitrogen fertilizer (N0), 150 kg N ha-1 (N150), and 200 kg N ha-1 (N200) were considered. The twelve experimental treatments arranged in a strip-plot design with complete randomized blocks with three replicates. The studied indices were stem height and diameter and total biomass during growth period. Irrigation management was performed, based on the calculation of corn evapotranspiration by using FAO-Penman Monteith (FPM) equation and soil moisture measurement in the root depth before each irrigation. The result showed that there was a significant effect of irrigation on total biomass and IWUE (P < 0.05). There was a significant effect of nitrogen on TB and WUE (P < 0.01). The minimum TB obtained for W1N0 treatment, 14537 kg/ha, and the maximum TB obtained for W4N200 treatment, 27893 kg/ha. The minimum IWUE for total biomass was 3.09 kg/m3 for W2 level and maximum was 3.57 kg/m3 for W4 level. Overall, TB and IWUE increased with increasing nitrogen. In general, the results showed that drip-tape irrigation system through increasing irrigation efficiency and decrease of soil surface evaporation would save water consumption and increase the water use efficiency and yield production.

Maximum Allowable Depletion (MAD) by affecting on number of irrigation in growing season and irrigation use reduction can be used as a managerial tool to save water. The purpose of this study was to investigate the effect of MAD in irrigation interval, applied irrigation water, top and root growth of grass under subsurface drip irrigation system. Three irrigation treatments which were MAD equal to 40%(W1), 60%(W2), and 80%(W3) arranged in a randomized complete blocks statistical design with three replications in 2012 and 2013 in Isfahan University of Technology. The soil moisture was measured daily using Moisture Meter GMK-770S in the root zone depth of grass to manage irrigation. The apparent parameters and root parameters of grass were collected periodically. These parameters were analyzed by Duncan's multiple range test and the results showed that the irrigation treatments had no significant effect on the root growth parameters and top weight. In the depth of 0-13 cm the maximum root volumetric density and fresh and dry root weighted density were occurred in W1, W2 and W3 treatments, respectively. On the average, 80.14% of the mentioned parameters were in of 0-5 cm depth and 19.86% of them were in of 5-13 cm depth. The maximum (3.93g/day) and minimum (3.21/day) dry biomass were observed in W1 and W3 treatments, respectively. Overall, the results indicated that although the increment of MAD to 80% in a clay-loam soil slightly decreased the shoot and root growth of mix sport grass under a subsurface drip irrigation system, it is a reasonable management solution with the aim of conserving water in the water shortage condition which had the least negative effect on apparent parameters of grass.

World's population growth and limited water resources and needing to more food production led to interest farmers to use nitrogen fertilizer more than soil requires and subsequently Nitrate leaching causes groundwater and environmental pollution. Therefore, researches has concentrated on improvement of nitrogen use efficiency, which numerical simulation is the effective solutions to optimize the management of water and fertilizer in the field in order to achieve the maximal yield and minimal nitrate pollution of soil, groundwater and drainage in water deficiency crisis condition. For this reason, the evaluation of new user friendly models in correct estimation of soil moisture and nitrogen content distribution and recognition of water and solutes movement in the soil and choosing the best management option for increasing productivity and economic performance and also reduction of nitrate pollution of soil and ground water source with the least limitations and high accuracy is necessary. The Eu-Rotate-N model has been developed for simulation of nitrogen use and specifically for optimization of nitrogen use in variation of vegetables in a wide range of conditions, which without the need to calibration has presented satisfactory results in many areas. So this study was conducted to evaluate the efficiency of Eu-Rate-N model in assessment of moisture and nitrogen distribution and yield under different nitrogen fertigation management for pepper plant.
Sweet pepper was planted at density of 8.33plant per m2 in a row planting method. 150kg per hectare per year of fertilizer was used during the season. Crop yield, soil water and nitrogen content were measured on a regular basis. The treatments consisted of three fertilizer level: zero (N0), the ratio of ammonium to nitrate 20:80 (N1) and 40:60 (N2), which was conducted in a completely randomized block with three replications in Isfahan. Irrigation based on daily monitoring of humidity was used with drip irrigation system. The irrigation Depth was calculated and applied with aim of replacing the water content deficiency in the root zone up to field capacity (FC) for the no water deficit treatment.
Coefficients were modified only for plant coefficients and length of each growth stage according to the area. To compare simulated data with measured data in field, indices of statistical root mean square error (RMSE), normalized root mean square error (NRMSE), coefficient of determination (r2) and index of agreement Wilmot (d) were used.
The NRMSE index for nitrate and soil water content was 11.45, 12.08, the RMSE was 0.89, 0.022, the r2 was 0.998, 0.996 and the d was 0.667, 0.66 respectively. All calculated indices for soil water and nitrate content were in the acceptable range. NRMSE index was less than 20 percent in all treatments which was indicating good ability of model in simulating soil water and nitrate content and r2 was more than 90 percent which pointed out to well process of simulation of the model. The simulation accuracy was greater at the end of the growing season. Comparing of RMSE statistical index for different depths showed that the simulation accuracy was increased by increasing depth which can be due to changes in surface evaporation and also the effect of environmental factors on surficial layers more than other layers. Generally the best simulation was related to the layer of 80 to 100 cm. And the average RMSE was 0.019 cm3 per cm3 for soil moisture content and 0.22 mg per kg for soil nitrate.In the layer of 80-100 cm the best simulation of soil moisture and nitrate content between treatments was related to N0 by the RMSE equal to 0.024 cm3 per cm3 and 0.21 mg per kg respectively and the weakest simulation was related to N3.The simulated yield in all treatments was less than its actual value. Comparison of simulations between three treatments demonstrated the usefulness of EU-Rotate N to examine the effects of management on, nitrate leaching.
The Eu-rotate-n model without calibration for site location was well capable of estimating soil water and nitrate content under different fertilizer management for Isfahan climatic conditions nevertheless it is suggested to use to calibrate yield functions to improve the yield simulation. Generally we can use Eu-rotate-n model for simulation of water and nitrogen content and eventually approach to integrated and optimal management in the farm in the hot, dry conditions of Isfahan.

The objective of this study was to evaluate emitters clogging by root of grass for four types of inline emitters under subsurface drip irrigation system. The experimental treatments consisted of four discharge emitters include 3.5, 4, 2.2 and 2 liters per hour (respectively T3, T2, T1 and T4). The four treatments were arranged in a randomized complete block design with three replications for two years. The soil texture of site was silty clay loam. Uniformity indexes at the beginning and end of the experiment consists of emitter flow variation (qvar), coefficient of variation (CV), coefficient of uniformity (CU), emission uniformity (EU), Range and statistical uniformity (Us)were measured. The EU value was 96, 87, 94, and 94% for new emitter in the beginning of the experiment and was 79, 19, 45, and 85% in the terminated of the experiment for T1, T2, T3, and T4 treatments, respectively. Our results showed that emitter clogging by root were 4% for T1 and T4 treatments, 24% for T2 and 36% for T3 treatments. Based on the findings emitters that were installed in the pipe (flat integral drip line) was more efficient than the cylindrical tube emitters clogging rooted.

Alfalfa (Medicago sativa L.) is the most important forage crap in the world and is widely cultivated especially, in arid and semi-arid regions. Because of it’s widely distribution, alfalfa has developed different morphological, physiological, and biochemical mechanisms across environmental stresses, especially drought. Thus, this experiment was conducted to determine catalase (CAT), ascorbate peroxidase (APX) and peroxidase (POX) activities, hydrogenperoxide, and malondialdehyde (MDA) contentsof roots and shoots of ten alfalfa cultivars (Qomi, Isfahani, Hamedani, Bami, Ordobadi, Gharayonje, Nikshahri, Yazdi, Baghdadi and Cody) under sixwater potential (0, -0.2, -0.4, -0.6, -0.8 and -1MP) during germination.Drought stress increased CAT, APX and POX activities, hydrogen peroxide, and MDA contents, in both root and shoot, however such alterations were cultivar-drought level-specific.According to the correlation between measured traits at drought condition, antioxidant enzymes activity in roots and shoots had negative and significant correlation with hydrogen peroxide and MDA contents of both root and shoot. Cultivars with higher enzyme activities had lower hydrogen peroxide and MDA contents (Qomi, Baghdadi, Nikshahri and Bami), while cultivars with lower enzyme activities and higher hydrogen peroxide and MDA content (Isfahani, Ordobadi and Hamedani), suggesting that tolerant cultivars may have retained sufficient water and had active enzymatic defense systems against oxidative injury, moreover, antioxidant enzymes activity can be used as biochemical indicator for drought tolerance in alfalfa cultivars.

Because of world population growth and limited water resources¡ irrigation should be moved in direction of producing more yield with less water. Therefore researches has concentrated on improvement of water and nitrogen use efficiency¡ which numerical simulation is the effective solutions to optimize the management of water and fertilizer in the field in order to achieve the maximal yield and minimal nitrate pollution of soil in water deficiency crisis condition.This shows the necessity of evaluating of new user friendly models to identify the correct distribution of water and solute in the soil and choosing the best management. The Eu-Rotate-N model has been developed for simulation and optimization of nitrogen use in vegetables rotation and without the need to calibration.This study in 2015 was conducted to evaluate the efficiency of Eu Rate-N model in simulation of moisture and nitrogen distribution and yield under drip and surface irrigation system and for pepper plant in a farm with silty clay loam soil in Isfahan. Four statistical index¡ RMSE¡ NRMSE¡ r2¡ d in order to model validation was calculated. These indexes for soil water content in both treatments and in the complete soil profile were 0.025¡ 13.26¡ 0.65¡ 0.996 respectively. Also NRMSE for soil nitrate content and plant yield in both treatment was less than 20 percent and r2 was more than 90 percent which pointed out to well efficiency and well process of simulation of the model. So the Eu-Rotate-N model efficiency for simulating soil water and nitrate content distribution and yield for pepper was confirmed and we can use Eu Rotate-N model for the simulation and optimization of agricultural water management in the hot and dry climate conditions in heavy soil texture for pepper.

The aim of this study was to investigate the feasibility of the use of geotextile filters to decrease suspended materials of wastewater to use in trickle irrigation systems to perform the experiment¡ a metal box was designed and made. Experimental treatments included four wastewater heads which were continued until clogging occurred. Outflow index¡ wastewater heads between geotextile layers¡ influent and effluent TSS (Total Suspended Solids) from filtration system were measured at specific times. The results showed that clogging rate of geotextile filters depends on physical and biological parameters. Furthermore¡ these results indicate that flow rate variation and wastewater head loss were the same while passing the geotextile layers and was independent of the clogging factor. However¡ the clogging time was related to the parameters of the swage quality. The flow rate trend variation versus time was linear with dramatic change at the beginning of experiment. However¡ after a while¡ it became logarithmic and slow. The decrease in flow rate for the 70-cm height of wastewater head was 8.83 lit/s/m until 27 mintutes of the beginning of the experiment and 3.47 lit/s/m at 56 mintutes of the end of experiment¡ respectively. In this study¡ some equations were developed to model the flow rate and wastewater head loss (RMSE= 9.6%¡ R2=0.86)¡ clogging of the filtration system and wastewater head loss (R2=0.968 RMSE=0.773Lit/s/m). Our results confirmed the accuracy of the models.

Woad (Isatis cappadocica Desv.) is a herbal plant, native to central and western Asia and from Brassicaceae family. In this research, we have investigated the effects of different irrigation levels on plant morphological and physiological attributes including canopy area, roots and shoots dry and fresh weight, roots length, proline concentration, shoots soluble carbohydrates content and antioxidant enzymes activity in a 4-replicate completely randomized design pot experiment. Irrigation regims consisted of replenishment of 100, 75 and 50 percent of soil water depletion (I100, I75 and I50) from the root zone. Results showed that drought stress had not significantly affected plants canopy area. The lowest and highest shoots fresh and dry weights were recorded in treatments I100 and I75-50, respectively. Roots fresh and dry weight and proline concentration were greater in I50 than the remaining irrigation levels. The shoot soluble carbohydrates content and root length were greatest in I50 level followed by I75 and I100. Also, there was an increasing trend in antioxidant enzymes activity from the second to fourth week after the commence of irrigation treatment. In I50, activity of ascorbat peroxidase, peroxidase and catalase enzymes were greater than the other irrigation levels. Superoxide dismutase was found to indicate greatest activities at the presence of I50 and I75 levels of irrigation.