Document Type : Research Paper

Authors

1 Department of plant genetic and production, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran

2 Agriculture and Natural Resources Research and Education Center of Hamedan Province, Hamedan, Iran

Abstract

Considering the importance and value of water and optimal use of nitrogen in order to maintain production productivity and simultaneously reduce the negative environmental effects, two experiments were conducted in the 2017-2018 and 2018-2019 cropping season in the research farm of the Faculty of Agriculture, University of Kurdistan. The experiments were performed as a split plot in a randomized complete block design with four replications. Experimental treatments were included the different levels of irrigation as the main plots (25% (W1), 50% (W2), 75% (W3) and 100% (W4) of crop water requirement) and different levels of nitrogen fertilizer as a sub-plots (25% (N1), 50% (N2), 75% (N3) and 100% (N4) based on crop nitrogen requirement). The results showed that all the studied traits except the time of reaching the maximum pod area index were affected by the main and interaction effects. The highest grain yield was obtained in W4N4 treatment (5069 kg.ha-1) and the lowest grain yield was obtained in W1N1 and W1N2 treatments at 880 and 899 kg.ha-1, respectively, which decreased by 82.6 and 82.2% compared to control treatment, respectively. The grain and biological yield of W4N3 (4826 and 17589 kg.ha-1) and W3N4 (4712 and 17657 kg.ha-1) treatments, represented of 25% reduction in nitrogen consumption and 25% reduction in water consumption, respectively compared to the control treatment (W4N4) were recognized as superior treatments in this study in order to improve productivity.

Keywords