Study of Grain Filling in Chickpea Cultivars under Drought Stress and N Fertilizer

Plant photosynthetate partitioning is important in seed yield formation. In this research، in order to study grain filling procedure of chickpea in the presense of drought stress and nitrogen (N) fertilizer on remobilization rate، final grain weight and grain yield were measured. Experiment was performed in an split-factorial using randomized complete block design with three replications. Drought stress treatment stand in main plots in three levels consist of no drought stress (complete irrigation)، moderate drought stress (irrigation at planting and early flowering) and severe drought stress (no irrigation). Nitrogen fertilizer in two levels (0kg N/ha and 25kg N/ha) and four chickpea cultivars (Azad، Hashem، ILC482 genotype and endemic mass of Bivanij) stand in sub plots. The results showed that that drought stress had significant effect on all the characters and all the characters except the remobilization and its efficiency was significant. Also، with increasing drought stress، remobilization amount، share and efficiency and rate of grain filling rate increased but duration of grain filling، final grain weight and grain yield was decreased and dry matter accumulation was lessIn non stress condition، during the growing season of chickpea was higher and Assimilate accumulation in it was higher، ultimately lead to increasing in final grain weight and grain yield per unit area. Effect of nitrogen fertilizer on stem dry weight and remobilization of it was significant and with application of N fertilizer these traits were reduced.