نشریه پژوهش های علوم کشاورزی پایدار
سال دوم شماره 1 (پیاپی 5، بهار 1401)

In order to investigate the effect of humic acid on the quantitative and qualitative yield of flixweed under different drought stress conditions in the form of split plots based on randomized complete blocks with four replications in the research farm of the Faculty of Agriculture, Ghods Branch. The main factor of irrigation in 3 levels includes: normal irrigation, mild stress and severe stress in the main plots and the secondary factor of humic acid in 3 levels including: non-consumption, 100 mg/L, 200 mg/L spraying with humic acid was present in the subplots. The results of analysis of variance showed that the effect of irrigation levels at 5% and humic acid at 1% and the interaction between irrigation and humic acid at 5% were significant. The highest grain yield was related to the treatment of 200 mg/L humic acid under normal irrigation conditions. The results showed that in all irrigation levels, increasing humic acid consumption led to increased grain yield, so that in normal irrigation and mild stress conditions the least difference between humic acid levels and in severe stress conditions the highest difference between humic acid levels was observed. This means that humic acid showed the greatest effect in reducing the effects of drought stress compared to other levels of irrigation (mild stress and normal irrigation).

Given the growing population of the world, meeting the nutritional and medicinal needs of plant products is very important. It is very important to pay attention to the effects of cultivation date and suitable cultivation area in order to provide the nutrients needed by plants to achieve high yield and desired quality crops. One of the most important factors in the growth and yield of potatoes is nutrition and determining the appropriate planting date according to the geographical area, which is one of the main objectives of the present study. The research was conducted as a split plot in the form of a randomized complete block design with three replications in Jihad Keshavarzi research farms located in Islamabad, Zahkloot and Kerman provinces. The main factor of geographical areas in the stages of flowering and tuber filling and the sub-factor including two planting dates (October 5 and 25) were examined. The results showed that the results of analysis of variance showed that the effect of area treatment, culture date and foliar application on the concentration of chlorophyll an and leaf carotenoids was significant. While it was not significant on chlorophyll b concentration. All bilateral effects except region on planting date were significant in chlorophyll a but not significant on tripartite effect. The highest concentration of chlorophyll a (34.1 mg / g fresh leaf) was obtained in foliar application of 1% iron nanoparticles with 2% magnesium nanoparticles

Many studies have been conducted on the effects of drought stress in the country and other parts of the world on oil sunflower and have been published as authoritative articles. Conclusions from a series of studies conducted using meta-analytic science help us to identify the trend of the effects of factors affecting the quantity and quality of sunflower production. This research is separated from various agricultural studies published in prestigious Iranian and foreign scientific journals and articles that were judged to be used in meta-analysis and then coded from among 62 articles; A total of 28 articles were analyzed in the meta-analysis process. The stresses applied in the studied articles were measured in three categories of normal irrigation (control) - moderate Stress - severe Stress based on the percentage of reduction of traits. Then the measured traits, which included 1000-seed weight, number of seeds according to seed oil percentage, to grain yield, were extracted from the articles. The results of drought stress meta-regression revealed that only the height trait had a considerable effect in severe drought stress; however, in the regression analysis, it was discovered that as linear stress increased, some investigated features declined, while trait Seed oil increased. With rising drought stress, this pattern remained practically consistent. The effect size of moderate and severe grain yield was insignificant compared to the control, among the results, the maximum effect size was 15 related to grain yield (-3/77), study on seed number (-3/31), study on 1000-seed weight (-0/68) and study on oil content (-0/6), drought stress according to priority, first on grain yield, number of seeds. Overall, the findings revealed that severe drought stress could significantly impact seed output and other features

This study was conducted to investigate the effect of different tillage methods, different levels of previous crop residues and different cultivars of soybean on yield and yield components of this plant. This experiment was conducted in the form of a factorial design with a completely randomized block base with three replications and during the growing season of 1399-1400 in one of the farms of Moghan Agriculture and Industry and Livestock Company located in the northeast of Ardabil province. In this study, two types of tillage systems (conventional and non-tillage) and two levels of wheat crop residues (complete and no residues) on the yield of two types of soybeans (Williams cultivar and L17 cultivar) were evaluated. The results of the effect of the mentioned systems on plant height, number of plants, 1000-seed weight, crop yield, percentage of protein and fat of soybean showed that the type of tillage had the most effect and the amount of residues had the least effect on the mentioned parameters. According to the results of the study of the effect of different tillage systems, the amount of residues and the type of plant planted on the agronomic characteristics of soybean at different levels can be expressed that by planting cultivar L17 cultivar soybean The highest crop yield can be achieved with conventional tillage method and complete amount of previous crop residues.

In this study, the effect of adding Bahar narang (Citrus aurantium) (400 ppm) and encapsulated Bahar narang extract (2000 ppm) and storage time (0, 7, 14, 21 and 28 days) on chemical properties (pH, acidity, and dry matter) and total phenolic compounds, microbial and sensory properties (flavor and overall acceptance) of doogh were evaluated. The results showed that the amount of free and encapsulated Bahar narang extract had a significant effect on pH, acidity, phenolic compounds and the total count of mold and yeast (P< 0.05). As the increased the amount of free and encapsulated Bahar narang extract, the pH and phenolic compounds increased and the amount of acidity, mold and yeast decreased significantly (P> 0.05). Storage time also had a significant effect on all measurement factors (P< 0.05). Over time, the amount of phenolic compounds in the control sample and the sample containing free extract decreased and the count of mold and yeast in the control sample and treatment containing free extract increased, but in the sample of doogh containing encapsulated extract no mold and yeast were observed until the 21 day of storage. Phenolic compounds were also preserved until the last day of storage. The results of statistical analysis of sensory evaluation of doogh samples also showed that with the addition of Bahar narang extract, the flavor score and overall acceptance increased (P <0.05). The results indicate that the addition of Bahar narang extract increases the shelf life of doogh and improves its sensory properties.

The purpose of this study was to study the impact of the production cooperative on agricultural production and sustainable development and agricultural mechanization in Jahrom in 2021. The aim of this study was applied research in terms of purpose and descriptive research in terms of data collection. The statistical population in the present study includes all members of the companies of the Production Cooperative Company in Simakan region with 606 people, with the formula of calculating the volume of Cochran, 235 of them were selected as the sample size and simple random sampling method. The data measurement tool in this study is a researcher-made questionnaire. Required information was obtained to measure agricultural production and sustainable development with a researcher-made questionnaire tool that included 25 questions and three subscales. After analyzing the statistical data by SPSS software, the results showed that there was a significant relationship between the Agricultural Production and Sustainable Development Cooperative Company. There was also a significant relationship between the Cooperative of Production and Environmental Development, and the results showed that the Production Cooperative Company has an impact on economic development in the Jahrom region.

Sustainability of agriculture requires a change from conventional methods to efficient methods that, while meeting the growing demand for food, take into account the security of future opportunities and maintain the quality and quantity of natural resources, including soil. The purpose of this study was to investigate the factors promoting the development of conservation agriculture of of Boukan County in West Azerbaijan province. This research was descriptive-survey. Statistical population of the study was included all leading farmers of Boukan county (N: 85) that out of them, 70 sample were selected by Cochran Formula. The researcher-made questionnaire was used for data gathering that’s validity and reliability was confirmed by experts and Cronbach's alpha coefficient was 0.82. The research questionnaire consisted of factors facilitating conservation agriculture. The results of factor analysis showed that six factors included; infrastructure, educational, planning, economic and technological could explain about 73% of the variance of the factors promoting conservation agriculture.