Effect of Spraying with Boric Acid and Potassium Fertilizer on Three Eggplant Hybrids Solanum Melongena L. Under Unheated Plastic House Conditions

The study aimed to determine the response of three hybrids of eggplant, THURAYYA, JAWAHER, and BARCELONA to spraying with boric acid (BO3 H3) (17% B) at a concentration of 25 mg L-1 or high potassium fertilizer 3 g.L-1 as NPK (50) or a combination of both fertilizers under unheated greenhouse conditions. The experiment was carried out using Randomized Complete Block Design with three rep-licates. The results showed that the Barcelona hybrid was significantly superior in leaf area, dry weight of the vegetative group, fruit set percentage, leaf chlorophyll content, number of fruits, plant yield and fruit solanine content compared to the two hybrids Thurayya and Jawaher. Spraying with the fertilizer combination of potassium at a concentration of 3 g.L-1 and boron 25 mg.L-1 was significantly superior in increasing the studied indicators compared to plants treated with one of the factors or not treated. The results showed that the highest measures for all study indicators recorded a significant increase in the treatment of the Barcelona hybrid interaction and spraying with the fertilizer combination of 3 g.L-1 potassium and 25 mg.L-1 boron compared to all other interaction treatments between the study factors.