Document Type : Original Article
Authors
1
Water and Irrigation Systems Engineering Department, Faculty of Agricultural Engineering, Al-Azhar University, Nasr City, Cairo,Egypt.
2
Soils and Water Dept. Faculty of Agriculture, Cairo, Al-Azhar University
3
Soils and Water Dept., Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo, Egypt.
Abstract
Two field experiments were elaborated for two seasons (2018/2019 and 2019/2020) under drip irrigation system in the open experimental farm (30° 3'19.49"N latitude, 31°19'10.19"E longitude) of Department of Soils and Water, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt, to investigate the impact of three levels of applied irrigation water: I1=100, I2=80 and I3=60% of irrigation water requirements (IR) and foliar application of potassium selenate (K2SeO4: 0.3 and 0.6 mM) and potassium silicate (K2SiO3: 5 and 10 mM) on the growth, yield and quality of faba bean (Vicia faba L., cv Sakha 3) and also the water use efficiency. The results indicated that increasing the applied irrigation water amount from 2219.75 (I3) to 3698.77 m3 ha-1 (I1), gave the highest mean values of plant height, num-ber of branches (NB), dry seeds weight, the weight of 100 dry seeds and dry seed yield as well as P and K content in seeds. In the contrary, the highest mean values of water use effi-ciency (WUE), protein and nitrogen (N) content in seeds occurred with 60% of IR for both seasons. Moreover, foliar spraying with potassium silicate at 10 mM led to a highly significant increase of all the studied parameters followed by foliar spraying with potassium selenate at 0.6 mM compared to the untreated plant's treatment. Consequently, it is recommended to grow faba bean plants (Sakha 3) with applying 80% of IR (2958.02 m3 ha-1) and foliar spray-ing with 10 mM potassium silicate and saving 20% of the amount of irrigation water for other uses in agriculture.
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