Effect of deficit irrigation on some growth parameters, yield and water productivity of broad bean crop

Abstract

This experiment was conducted to evaluate the effect of the deficit irrigation on some growth parameters, crop productivity and crop water productivity of broad bean crop (Nubaria 1) during winter seasons of (2018/2019) and (2019/2020) in Faculty of Agriculture farm (Latitude of 30 0 25 \ 10.9N and longitude of 30 0 32 \ 34.2 E, mean altitude 32 meters above sea level), Al-Azhar University, El-Sadat City, Monufyia Governorate, Egypt. The experiment was a randomized complete block design The irrigation system was used under drip irrigation system. The plant growth periods are divided into three stages: vegetative growth stage (S1), flowering stage (S2) and seed filling stage (S3). The irrigation treatments are 100% of ETcrop (DI1) in all growth periods as a control, 85% of ETcrop (DI2) in one of the growth periods, then complete the remaining growth periods by 100% of ETcrop and 70% of ETcrop (DI3) in one of the growth period, then complete the remaining growth periods by 100% of ETcrop. The water requirements of broad bean crop were calculated from data of Central Laboratory for Agricultural Climate using CROPWAT 8.0 program. The results showed that the highest values of growth parameters (plant length, leaves number and dry weight) and yield of broad bean were obtained after irrigated by 100% of ETcrop followed by treatments which were irrigated with 85% of ETcrop at flowering stage without significant difference between them when compared to other treatments. The water productivity of 70% of ETcrop treatments is higher than the other treatments, although the yield of these treatments is the lowest compared to 100% and 85%.