FIELD experiment was performed to investigate the mitigation effects of foliar K on wheat under drought stress. Foliar potassium treatments, either in terms of sources and concentrations, relatively increased wheat water use by about 111 and 117 and 114 % for the foliar application of K 2 O-K 2 SO 4 and 120, 120 and 117% for the foliar application of K 2 O-K 2 SiO 3 at concentration treatments of 0.5, 1.0, and 2% respectively relative to control treatment (0.0 K 2 O) = 100. The positive mitigation effects of K on wheat water use were more pronounced for using K 2 SiO 3 than K 2 SO 4 respectively. The foliar application of potassium either in the forms of K 2 SO 4 or K 2 SiO 3 at the different tested concentrations increased the grain production per unit of water use. Where water use efficiency reached about 2.23, 2.34 and 2.27 kg/m 3 for K 2 SO 4 and 2.41, 2.39 and 2.33 kg/m 3 for K 2 SiO 3 at concentrations of 0.5, 1 and 2% K 2 O respectively compared to 1.99 kg/m 3 for the control treatment. It could be concluded that the foliar K application may act positively act to mitigate drought stress particularly when applied at the beginning of the emergence, tillering and flowering stages of wheat.
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