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اهداف: این پژوهش برای شناخت توانایی اراضی استان لرستان برای کشت دوم ارزن علوفه‌ای به کمک سامانه اطلاعات جغرافیایی(GIS)، فرآیند تحلیل شبکه‌ای(ANP) و منطق فازی انجام گرفت.مواد و روش‌ها: به‌منظور شناخت توانایی اراضی ابتدا لایه رستری عوامل محیطی مؤثر بر کشت ارزن علوفه‌ای شامل دمای کمینه، بیشینه و متوسط، ارتفاع از سطح دریا، شیب، pH، بافت، ماده‌آلی، نیتروژن کل، پتاسیم و فسفر قابل‌دسترس در محیط GIS تهیه گردید. سپس به‌کمک توابع فازی نقشه هر عامل استانداردسازی شد و وزن هر عامل به کمک ANP مشخص شد. با تلفیق لایه‌های وزن‌دار شده لایه‌های نهایی تولید و براساس منطق فازی به چهار طبقه خیلی‌مناسب، مناسب، ضعیف و نامناسب پهنه‌بندی شدند. یافته‌ها: نتایج نشان داد ارزش فازی اراضی زراعی برای کشت ارزن علوفه‌ای بین 35/0 تا 88/0 بود. بیشترین سطح محدوده مورد مطالعه به‌طبقه مناسب(42/60 درصد) و کمترین سطح به‌طبقه خیلی‌مناسب(35/16 درصد) تعلق داشت. بررسی نقشه‌های تناسب‌بندی اقلیمی، توپوگرافی و حاصل‌خیری خاک نشان داد این عوامل به‌ترتیب باعث محدود شدید در 27/38، 15/38 و 44/7 درصد اراضی شدند. ارزیابی نقشه‌های عوامل اقلیمی، توپوگرافی و خاکی نشان داد به‌‌جزء pH خاک بقیه عوامل هر کدام در بخشی از محدوده مورد مطالعه موجب محدودیت برای کشت ارزن علوفه‌ای شدند.نتیجه‌گیری: بررسی نقشه نهایی استعدادسنجی نشان داد حدود 77 درصد منطقه مورد مطالعه دارای توانایی خیلی‌مناسب و مناسب می‌باشد و مناطق سردسیر به‌خصوص شرق و شمال شرق استان دارای توانایی ضعیف برای کشت ارزن علوفه‌ای با دو چین بودند.

Objective: The precise zoning of environmental factors in each region for agricultural activities provides a very important guide for decision-making by managers and policymakers in the agricultural sector and farmers. Therefore, this study was conducted to zone arable lands in Lorestan Province for summer (second) forage maize cultivation using GIS, network analysis process (ANP), and fuzzy logic in 2022. Methods: First, the raster layer of environmental factors affecting forage maize cultivation including climatic factors (minimum, maximum and average temperature), topography (altitude and slope), and soil (pH, texture, available potassium, available phosphorus, organic matter and total nitrogen) got prepared in GIS. Then, using fuzzy functions, the map of each factor was fuzzy and the weight of each factor was determined by ANP. The final layers were produced by combining the weighted layers, and finally these layers were zoned into four highly suitable, suitable, marginally suitable, and unsuitable layers. Results: The results of this study indicate that 96.35% of the study area has suitable conditions and 3.65% has marginal ones. Except for a small part of the north and south of the agricultural lands of Lorestan Province, the rest of the lands had suitable conditions. Evaluation of fuzzy maps showed that the highest fuzzy importance was related to climatic factors (0.63) and the least to soil factors (0.53). Conclusion: A separate evaluation of climatic, topographic and soil factors maps indicates that all factors except soil pH limit the cultivation of forage maize in Lorestan Province. [ABSTRACT FROM AUTHOR]

In order to investigate the effect of planting arrangement on growth indices and grain yield of a red bean cultivar (Sayyad cultivar), The experiment was conducted in a split-plot randomized complete block design with 4 replications in Jihad Agricultural Services Center of Al-Mahdi town, Azna. The main factor consisted three row spacings including 20, 30 and 45 cm and the sub-factor consisted three densities including 40, 50, and 60 plants m-2. The results showed that by reducing the row spacing dry matter accumulation, CGR and LAI at different periods of growth and grain yield increased. However, changing the row spacing did not have a significant effect on RGR and NAR. With increasing plant density, the dry matter accumulation, CGR and LAI over the course of plant development, RGR and NAR in reproductive stage and thus grain yield increased. Plant density had no significant effect on RGR and NAR in vegetative growth stage and maximum NAR. Considering the increase in most traits in the row spacing of 20 cm and a density of 60 plants m-2, this type of planting arrangement might be suitable for cultivation of red been under similar environmental conditions in Azna, Lorestan, Iran. [ABSTRACT FROM AUTHOR]

Using of nitrogen fertilizers may increase the photosynthesis and yield of crop plants. Hence, we investigated the effect of chemical nitrogen and rhizobium fertilizers on the photosynthesis and yield components of red beans (Sayad cultivar) in an experiment as a randomized complete block design with 4 replications in Al-Mahdi town, Azna, Iran. The treatments included zero (control), 100 and 200 kg ha-1 of urea and rhizobium, and rhizobium + 30 and 50 kg ha-1 of urea. The results of this experiment showed that the effect of fertilizer treatments was significant on leaf area index, level, efficiency and contribution of current photosynthesis, level, efficiency and contribution of remobilization, dry weight in pre-flowering and maturing stages and grain yield and its components. The chemical fertilizer and rhizobium application increased the amount of all the above traits except for the contribution of current photosynthesis. There was a strong correlation between grain yield and the level, efficiency and contribution of current photosynthesis and the level, efficiency and contribution of current of remobilization. The examined wide range of nitrogen fertilizers were potent to increase the photoassimilates production and, hence, yield and yield components of red bean in this region. [ABSTRACT FROM AUTHOR]