الفهرس 
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Abstract
Pots experiment was conducted out at the Faculty of Agriculture, Saba Basha, Alexandria University, Alexandria Governorate, Egypt, during the winter season of 2020 to study the effect of application of K- fertilizer sources on growth and chemical composition of spinach cv SCO-017 F1 (Denmark) grown in different soil texures. The pots factorial experiments was laid out in rondomized complete block design (RCBD) with three replications in both seasons. The first factor was the three soil texures (loam sandy, sandy loam, and clay loam), while the second factor was potassium sources and concerntrations (Potssium sulfate at 50%, potssium sulfate at 100%, potassium citrate at 50 %, potassium citrate at 100 %, potassium humate 50 %, potassium humate 100 %, and control).