Effect of Organic Fertilizer Rates on the Water Requirements of Snap Beans (Phaseolus vulgaris L.) plants

A field experiment was carried out during successive autumn seasons of 2019 and 2020 in EL-Kassasien Horticulture Research Station Ismailia Governorate to investigate the effect of water requirements rates (720, 960 and 1200 m³ / fed) combined with different amounts of organic manure (10, 20, 30 m³) on vegetative growth, chemical composition of plant foliage as well as green pods yield and its quality of snap bean (Phaseolus vulgaris L. cv. Poulista) grown under sandy soil condition using drip irrigation system. A split plot designed with three replicates was adopted. Irrigation quantities treatments were placed in the main plots and amounts of organic manure treatments were located randomly in the subplots.  Results showed that all vegetative growth characteristics, chemical compision characteristics, pods quality and pods yield as well as WUE were significantly increased with increasing rate of applied irrigation water in both seasons. In addition increasing amount of applied irrigation water from 720 to 1200 m³/fed. exhibited the highest values of most studied parameters of snap beans plants in both seasons of study. Results show also clearly that studied paremeters were significantly increased with increasing amount of applied organic manure from 10 to 30 m³/fed. in both seasons of study.        The highest values were obtained with adding highst amounts of organic manure (30 m³/Fed.) then irrigate plants by highest rate of water (1200 m³/Fed.) and vice versa.