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Use of efficient K dose is an important complementary strategy in improving rice yield, quality and reducing cost of production. The price of K fertilizers is getting higher day by day and becoming unaffordable to farmers. Potassium (K) is an essential nutrient that affects most of the biochemical and physiological processes that influence plant growth and metabolism of rice. Field experiments were conducted during 2013 and 2014 seasons at the farm of Sakha Research Station, Sakha, Kafr ElSheikh, Egypt to compare foliar application of Potassium Sulfate (K2SO4) with soil application of Potassium sulfate and their combination on yield of Egyptian hybrid rice 1(EHR1) crop. Five treatments from potassium sulfate as a soil application or a foliar application and their combinations were used. The increase in panicle number/m and panicle weight were a maximum when half dose of recommended potassium as basal (59.5 kg.ha) + 2% Potassium sulfate as a foliar application were applied at panicle initiation (P.I). Grain yield of the treatment K3 (half recommended dose of potassium as basal + 2% potassium sulfate as foliar application at P.I) proved to be superior over all treatments. Among all treatments tested the highest values of potassium uptake was observed in K3. Our results suggested that foliar application of Potassium sulfate at 2 % concentration 15 days after transplanting and at P.I was active, appropriate and could produce rice yield equal to the yield obtained with soil application of potassium sulfate at the rate of 119 kg ha. From the economic point of view side, spraying with Potassium Sulfate at the concentration of 2%, 15 days after transplanting (DAT) plus spray with the same concentration at panicle initiation (PI) was the best treatment to grain more yield with high economic value.

RESPONSE OF EGYPTIAN HYBRID RICE VARIETY TO SOIL AND FOLIAR APPLICATION OF POTASSIUM SULFATE FERTILIZER