The yield evaluation and water productivity on common bean and cowpea in irrigation management condition and nitrogen fertilizer

This research was carried out to evaluate irrigation management and water productivity in common bean and cowpea in Astaneh-Ashrafieh in 2016 and 2017. The present study was conducted as split plot in a randomized complete block design with three replications. The main treatments were irrigation of 40, 60, 80 and 100% water requirement and sub plots without fertilizer and 30, 60 and 90 kg N ha-1 in two common bean cultivars and cowpea. The results of this study showed that the effect of irrigation in both cultivars on biological yield, pod and seed, at 1% level, and nitrogen fertilizer effect at 1% level on biological yield, and at 5% level on seed yield were significant. Interaction of irrigation and fertilization at 1% level was significant on water productivity in biological yield, pod and seed yield. During the research years, the highest amount of seed yield due to irrigation on cultivars in 2016 and 2017, in 100% water requirement, was 1137 and 1183 kg ha-1 respectively, and in the common bean cultivar it was 2400 and 2512 kg ha-1 respectively. The maximum seed yields from nitrogen fertilizer on cultivars at 2016 and 2017 of age at 30 kg N ha-1 cultivars at 949 and 953 kg ha-1, respectively, and in cowpea, it was 1436 and 1509 kg ha-1 respectively. The highest seed yield in 2016 and 2017 in 100% water requirement and 30 kg N ha-1 in cowpea cultivar was 1580 and 1643 kg ha respectively. The maximum seed yield in the 2016 and 2017 of in 100% water requirement and 60 kg N ha-1 in conventional bean cultivars was 3486 and 3646 kg ha-1, respectively. The highest amount of water productivity in seed in 2016 and 2017 of cowpea in 100% water requirement and 30 kg N ha-1 in cowpea was 0.35 and 0.33 kg m-3 respectively, and the maximum amount of water use productivity in seed in 2016 and 2017 in 100% water requirement and 60 kg N ha-1 in commn bean cultivars was 0.70 and 0.69 kg m-3 respectively.