نشریه علوم به زراعی گیاهی
سال هشتم شماره 2 (پاییز و زمستان 1397)

In order to study the combined effect of biological and chemical fertilizers of phosphorus and nitrogen on quantitative and qualitative characteristics of sunflower, this experiment was conducted as a factorial based on a randomized complete block design with three replications in a field in Izeh County during 2017 cropping season. The experiment treatments included phosphorous fertilizer in 4 levels (totally, triple superphosphate fertilizer as base, 70% triple superphosphate fertilizer and the remaining through fertile-2 phosphate biological fertilizer, 40% triple superphosphate fertilizer and the remaining through fertile-2 phosphate biological fertilizer, entirely through fertile-2 phosphate biological fertilizer) and nitrogen fertilizer in 3 levels (entirely through the urea fertilizer, 70% urea fertilizer and the remaining throughazotobacter, 40% urea fertilizer and the remaining through azotobacter). The results showed that the effects of biological and chemical fertilizer phosphorus and nitrogen significantly increased grain weight, seed yield and oil yield. The highest seed yield was for 70% superphosphate fertilizer treatment and the remaining for fertile-2 and 70% urea fertilizer and the rest for azotobacter respectively 3170 and 2736 kilogram in hectare and the lowest one was in the treatment of fertile-2 entirely biological fertilizer and 40% urea along with azotobacter respectively with 2173and 2506 kilogram in hectare. With regard to these results, application of 70% superphosphate fertilizer and the remaining through fertile-2 phosphorous biological fertilizer and 70% urea fertilizer and the rest throughazotobacterrelative to other treatments caused qualitative and quantitative yield increase in sunflower and is recommended in the region.

In order to investigate drought tolerance of maize hybrids, a split plot experiment was conducted in a randomized complete block design (RCBD) with three replications in the research field of Payame Noor University (PNU) of Kermanshah in 2013. The main factor included drought stress (stress and normal condition) and sub factor including nine corn hybrids. The results of analysis of variance indicate the different reaction of the hybrids studied for grain yield and the ability to select hybrids based on yield. Comparison of numerical values ​​and rank of each hybrid based on grain yield based on grain tolerance index showed that hybrids number one, three, seven and eight were identified as drought tolerant hybrids.Results of correlation analysis showed that MP, GMP, STI, HAR, K1, K2, SSPI and YI had positive and significant correlations with Yp and Ys.They are suitable for choosing high yield hybrids in both conditions. Gabriel's bi-plot drawing was performed based on the analysis of the main components. Based on this breakdown, the first two components justify about 98 percent of the variance. The results showed that the studied hybrids were located in two groups of high yield potential and weak potential, so that hybrids number one, three, seven and eight were placed in the vicinity of drought stress tolerance vectors as superior hybrids. The cluster analysis, based on the superior indices of the studied hybrids grouped the hybrids into two clusters that are similar to the Gabriel bi-plot.

Application of bio-fertilizers in Sustainable Agriculture perform important role at increasing of crop pro-duction and improving soil fertility. In order to investigate combine application of biological and chemical phosphorus fertilizers and micronutrients on morpho-physiologic characteristics of barley, present research was conducted via split plot experiment according randomized complete blocks design with three replications in Ramhormoz during 2016-17. The main treatments consisted of phosphorus fertilizers and bio-fertilizers in four levels (Non use phosphorus fertilizer or control, bio-fertilizer “Barvar2”, bio-fertilizer “Barvar2” with 150 kg.ha-1 superphosphate fertilizer and 200 kg.ha-1 superphosphate fertilizer) and spray micro-nutrient (included micronutrients of zinc, iron and manganese) at three levels (no spray micro-nutrient or control, spray micro-nutrient at 0.002 and 0.004 concentration) belonged to sub plots. Results of analysis of variance indicated effect of combine application of biological and chemical phosphorus fertilizers and micronutrients on measured traits was significant. Mean comparison result of phosphorus fertilizers showed that bio-fertilizer “Barvar2” with 150 kg.ha-1 superphosphate fertilizer had maximum peduncle length (9.46 cm), awn length (11.95 cm), leaf area index (4.5), chlorophyll index (40.26) and days to rippening (185 day) also spray micro-nutrient at 0.004 concentration achieved maximum rate of mentioned traits. According mean comparison results of interactions of treatments the highest seed yield (400.1 g.m-2) and main spike weight (2.89 gr) belonged to bio-fertilizer “Barvar2” with 150 kg.ha-1 superphosphate fertilizer and spray micro-nutrient at 0.004 concentration. Generally to achieved optimum yield use bio-fertilizer “Barvar2” with 150 kg.ha-1 superphosphate fertilizer and foliar application micro-nutrient at 0.004 concentrations for Ramhormoz weather conditions can be advised.

In order to investigate the effect of different amounts of chemical fertilizers (urea) and organic (sugar cane filter) on wheat yield, an experiment was conducted in 2014 as split plots in a randomized complete blocks design with three replications in the land cultivation plant of Haft Tape sugar cane (Shush) was implemented. Sugar cane filter fertilizer was used in four levels (without filter cake (T1), 20 t / ha (T2), 40 t / ha (T3) and 60 t / ha (T4) as the main factor and Fertilizer urea was considered as a sub factor in there levels of fertilizer: No-fertilizer (N1), 100 kg/ha (N2) and 200 kg / ha (N3). The results of analysis of variance of treatments showed that the effect of sugar cane filter at 5% probability level and fertilizer urea at 1% probability level was significant for all studied traits except for 1000 seed weight. Also, interaction of treatments on yield and yield components of wheat was not significant. The results of the comparison of the mean of the data showed that the increase of sugar cane filter as a organic matter to soil, plant height, spike length, spikelet number per spike, number of seeds per spike, number of spikes per square meter, 1000 grain weight, grain yield per square meter and harvest index significantly increased. The treatment of 60 tons of filter cake per hectare increased seed yield by about 137. 6 gr/m2 (from 648.4 to 510.5 gr/m2), equivalent to 21.2% of the control (without filter cake). Using Urea fertilizer, the measured traits significantly increased compared to the control. The application of urea fertilizer at 200 and 100 kg/ha increased grain yields of 228.5 and 201.3 gr/m², equaling 33.6% and 32.6%, respectively. In general, the results showed that increasing the use of urea and organic fertilizers has led to a significant increase in growth and functional attributes, and the best treatment for chemical fertilizers and organic fertilizers is 200 kg/ha and 60 T/ha of filter cake, respectively.

This research carried to evolution response of rapeseed varieties to salt stress. In first experiment growth response of five rapeseed varieties (Fornex, Consoul, Orient, Opera and Okamer) to four salinity levels (0, 40, 80 and 120 mmol NaCl) was investigated using a factorial experiment with randomized complete blocks design in three replications. Results indicated under highest salinity, highest and lowest seedling dry matter obtained from Fornex (3.3 gr) and Okamer (1.2 gr). In twice experiment, salt tolerance mechanism in Fornex (salt tolerance) and Okamer (salt sensitive) was evaluated. Results showed Fornex salt tolerance due to lowest Na+ and Malondealdehaid leaf concentration and highest K+ and Peroxidase activity in compared Okamer varity. Results indicated decrease in Na+, increase in K+ and K/Na and Peroxidase activity have reasonable role in salt tolerance in canola cultivars.

In order to evaluate of weeds control at different levels of sulfur coated urea on yield and qualitative characteristics of sugar beet, a study was carried out as split plot design in randomized complete blocks design with four repetitions in Shoushtar region during 2016. Experimental treatments consisted of four different levels of sulfur coated urea (SCU) (0, 150, 180 and 250 kg.ha-1). The use of herbal treatments of chloropyralide + Des Modifam + Moeifam + Autophamousite and metamitron + Modifem + Autophamousite as a sub-agent. The results showed that weed dry weight was affected by different amounts of urea with sulfur coating and increased with increasing sulfur content of urea, which increased the weed weight of weeds, so that it was highest in application of the highest amount of urea with sulfur content per hectare with no weeding of weeds. The amount of 237 grams per square meter was obtained. Also, in the effects of fertilizer interaction and weed control, the highest yield of sugar beet (13421 kg) was attributed to full weed treatment and the highest application rate of sulfuric urea. The highest root yield of sugar beet (57004 kg ha-1) was related to weed control and application of the highest amount of sulfur urea. Among the weed control treatments, the highest root yield of sugar beet (46711 kg.ha-1) was obtained in metamitron + Des medifam + Autophamousite herbicide application and application of the highest amount of urea with sulfur content per hectare. Also, the highest percentage of pure sugar in the treatment of non-application of sulfur content of urea with non-control of weeds was 18.6% and 20.30%, respectively. In general, it can be said that Urea fertilizer with sulfur coating with the use of Médifam + Des Moiifam + Autophamousite + Metamitron has the optimum performance of sugar beet.

Salinity is one of the growth limiting factors in agricultural. In order to determination of the most effective traits on soybean yield at different levels of salinity stress, a factorial experiment with 3 replications was conducted in greenhouse of Sari Agricultural Sciences and Natural Resources University in 2016. Treatments consisted of four soybean genotypes (Hill, Dayr, Ford and Williams), three levels of sulfur (control, 5 and 10 grams of sulfur powder) and three levels of salinity (control, 4 and 8 dS/m). Analysis of variance showed that simple effects of sulfur, genotype, salinity and interaction between sulfur and salinity were significant at 0.01 probability level. Correlation coefficients between studied traits showed that there was a positive and significant correlation between grain yield and all traits except for the Na+/K+ ratio. By using stepwise regression analysis in the control treatment, sulfur content, in 4 ds/m salinity, traits of Na+ percentage, fresh weight of shoot and seed protein percentage, and in salinity of 8 ds/m seed number per plant were entered in model. path analysis of grain yield showed the highest positive direct effect in the control, second level and the third level of salinity were sulfur content, Na+ and number of seeds per plant, respectively. The results of this study showed that the traits of sulfur content, Na+ percentage, fresh weight and protein percentage are the scales related to grain yield, which can be used as an indirect selection scale for genetic improvement of yield in saline regeneration programs.

In order to investigate the effect of planting density and different irrigation regimes on the yield of pearl millet in Ahvaz, Iran, in 2017, was carried out. The experiment was conducted as a split-plot based on randomized complete block design with three replications. In this study, the irrigation regime was considered as the main-plot at three levels (90, 120 and 150 mm evaporation from classA evaporation pan) and the plant density as the sub-plot at four levels (20, 30, 40 and 50 plants/m2 ). The results showed the irrigation regime had a significant effect on fresh and dry leaf weight, fresh and dry weight of stem, plant height, stem diameter, and chlorophyll a and b at 1% probability level. Also, the plant density had a significant effect on leaf fresh and dry weight, fresh and dry weight of stem, plant height and stem diameter at 1% probability level. The interaction of irrigation regime and plant density on leaf fresh and dry weight, fresh and dry weight of stem and plant height was significant at 1% probability level. In general, according to the results, it can be concluded that with increasing drought stress all measured traits decreased. Therefore, considering the environmental conditions of the experimental area as well as the economic aspects of applying and performing irrigation after 90 mm of the evaporation pan, treatment is more suitable. Also, among the densities studied, the density of 50 plants/m2 had the highest biological yield of total forage millet. As the final result, the best treatment was determined using a density of 50plants/m 2 and irrigation after 90 mm evaporation from the evaporation pan.

In order to evaluation of two types of planter for mechanized rapeseed sowing, an experiment was conducted in Agriculture Faculty of Islamic Azad University, Shoushtar Branch during 2014 and 2015. A strip plot in the form of randomized complete blocks design was applied with three replications. Main Plots were including planter types: a1; precision pneumatic Planter (mod. V5 Gaspardo - Italy), a2; grain driller (made by Barzegar Hamedan). Subplots were two levels of forward speed including: b1; 4 Km/hr and b2; 6 Km/hr. Rate of damaged seed in seed metering device, uniformity of planting depth, uniformity of seed distance on row, seed emergence and field capacity were measured for each machine. Results showed that in five parameters Gaspardo precision pneumatic planter had better result compared to the Barzegar Hamedan grain driller. This advantage was significant at in five parameters at 5% of probability. Gaspardo precision pneumatic planter than Barzegar Hamedan grain driller reduced the rate of seed damage at 3.83% and increased the rate of uniformity of planting depth, uniformity of seed distance on row, seed emergence and field capacity at the rates of 11.4, 39.3, 24.2 percent, 0.38 ha/hr respectively. Forward speed had no significant effect on the rate of damaged seed, uniformity of planting depth, uniformity of seed distance on row, but seed emergence significantly decreased and field capacity significantly increased with increasing forward speed.