الفهرس 
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Abstract
Two field experiments were carried out during the two successive summer seasons of 2019 and 2020 in the private farm at Keshek Village, Abou- Hamad distract, Sharkia Governorate, Egypt to study the effect of potassium rates (45, 60, 75 and 90 kg K2O/fed.) as soil applications and different sources of potassium (potassium citrate at 1 ml/l, potassium humate at 3 g/l, potassium thiosulfate at 1ml/l and potassium silicate at 3 ml/l, beside, unsprayed treatment (control) as foliar spray, on plant growth, fruit yield and its components as well as fruit quality of eggplant (cv. long black). The results revealed that the interaction between K2O at 90 kg/fed. and foliar spray with potassium citrate (KC) at 1 ml/l gave the highest values of plant height, number of branches and leaves/plant, fresh weight of branches, leaves and shoots, dry weight of branches, leaves and shoots/ plant, the concentrations of chlorophyll a, b, total chlorophyll a+b and carotenoides in leaf tissues, N,P and K contents and uptake by shoots of eggplant grown in clay soil at 110 days after transplanting followed by the interaction between K2O at 90 kg/fed. and spraying with potassium humate (KH) at 3 g/l in both seasons. On the other hand, the lowest values of all above-mentioned characters were recorded with 45 kg K2O/fed. and sprayed with water in both seasons. Furthermore, the interaction between K2O at 90 kg/fed. as soil application and KC at 1 ml/l as foliar application increased yield/plant, early yield, and total yield, total protein and total carbohydrates and K contents as well as dry matter (%) in fruits with no significant differences with K2O at 75 kg/fed. and spraying with KC at 1 ml/l as for total yield, followed by the interaction between 90 kg K2O/fad. and spraying with KH at 3g/l in both seasons. As for potassium use efficiency, the highest values were recorded with the interaction between 45 kg K2O/fed. and spraying with KC at 1 ml/l (245.3 and 247.2 kg fruit/kg K2O) in the 1st and 2nd seasons, respectively.