ارزیابی درصد پروتئین دانه، میزان کلروفیل و فعالیت برخی آنتی اکسیدانت‌های نخود تحت تراکم های مختلف کاشت و آبیاری تکمیلی

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In order to evaluate the effects of different levels of supplementary irrigation and plant density on some physiologic characteristics in chickpea cv. Hashem under rainfed condition, a field study was conducted in east of Golestan province during 2012-13 cropping season. Treatments were arranged as split plot in randomized complete block design with four replications. Different supplementary irrigation levels (rainfed without irrigation (I0), supplementary irrigation in flowering stage (I1) and supplementary irrigation during pod filling stage (I2)) were assigned to main plots and sub-plots comprised of different plant densities (20, 30, 50 and 70 plants/m2). Means comparison of studied traits was indicated that the highest amount of grain protein percent was gained under I0 treatment (P<0/05). I2 was caused increasing to 36% in relative leaf water content in compare to I0 ones. I1 and I0 had the highest and the lowest amount of leaf chlorophyll content with 613 and 374 unite, respectively. Supplementary irrigation decreased superoxide dismutase enzyme activity in compare to rain feed condition (I0) in leaves. Catalase enzyme activity under I0 condition in compare to I1 and I2 was more 43% and 53%, respectively. The highest amount of leaf chlorophyll content was seen in 70 plants per/m2. Supplementary irrigation in flowering stage × 70 plants/m2 had the highest grain economic yield among whole studied treatments In this survey, the most significant and positive correlation among yield components with grain yield was seen by leaf chlorophyll content (R2= 0/74**).