الفهرس 
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Abstract
to study the effect of potassium fertilizers levels and foliar application treatments as well as their interactions on growth, yield and some chemical constituents in both leaves and tubers of potato cv. Spunta. a field experiments was carried out at a Private Farm in Meet Habib Village, Gharbia Governorate, during Winter seasons of 2015/2016 and 2016/2017 seasons using design of strip-plot with three replicates. The vertical plots were allocated to three levels of mineral potassium fertilizers (K-levels) as soil application as follows : 1- 100 % of the recommended dose (96.0 kg K2O/fed). 2- 75 % of the recommended dose (72.0 kg K2O/fed). 3- 50 % of the recommended dose (48.0 kg K2O/fed). The horizontal plots were assigned to four foliar application treatments as follows : 1- Without foliar spraying (control treatment). 2- Spraying with commercial fertilizer (KTS) as a source of potassium and sulphur (36 % K2O and 25 % S) at the rate of 2.5 ml/liter water in each spraying. 3- Spraying with commercial fertilizer (MegaPot) as a source of nitrogen, potassium and sulphur (9 % N, 40 % K2O and 15.69 % S) at the rate of 1.5 g/liter water in each spraying. 4- Spraying with commercial fertilizer potassium sulphate (K2SO4) as a source of potassium and sulphur (50 % K2O and 17 % S) at the rate of 10 g/liter water in each spraying. Foliar spraying potato plants four times with commercial fertilizer (MegaPot as a source of nitrogen, potassium and sulphur) at the rate of 1.5 g/liter water exceeded other foliar application treatments and produced the highest values of vegetative growth characters, yield and quality parameters of tubers, except total sugars percentage, nitrite and nitrate concentrations in fresh potato tubers in both seasons.