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A field experiment has been carried out at the Ismailia Agricultural Research station, Agricultural Research Center (ARC), Egypt, during the summer seasons of 2017 and 2018. It aimed to study the effect of deficit irrigation during vegetative growth and addition of humic acid (Hu), gibberellic acid (GA3), silicon (Si), potassium (K) and calcium (Ca) on peanut yield and its components. The present work included three irrigation treatments, T1 irrigation with amount of 100% ETc, imposed from 10 days after sowing until harvest, T2 irrigation with amount water equal to 60%ETc imposed 10 days after sowing until 38 days after sowing after which with 100% ETc until harvest, T3 irrigation with amount of water equal to 80% ETc imposed from 10 days after sowing until 38 days after sowing follows with 100% ETc maintained until harvest. Foliar spray included 5000 ppm Hu, 150 ppm GA3 and 200 ppm Si. Potassium K was added as soil application before sowing at a rate of 100 kg ha-1 as K2SO4 and Ca was applied during soil preparation as CaSO4 at rate of 500 kg ha-1. The fully irrigated treatment T1 100% ETc yielded the highest pods and kernel yield but non-significant difference from T2 and T3. WUE and IWUE increased by deficit irrigation during vegetative growth. Application of Hu, GA3, Si, K and Ca significantly increased peanut pods and kernel yield and had significant effect on WUE and IWUE.

Enhancing Water Use Efficiency in Sandy Soil Using some Organic and Mineral Additives under Deficit Irrigation during Vegetative Growth of Peanut