Effect of potassium and ascorbic acid on growth, yield and quality of olive CV. Khadrawi

الملخص EN

This study was carried out in a private olive orchard located near kasara village, Duhok governorate, Kurdistan region, Iraq, during growing season 2014 in order to study the effect of spraying olive tree 8 years old with three concentration of potassium fertilizer as potassium sulfate (0, 5 and 10 g.l-1) and three concentration of ascorbic acid (0, 200 and 400 mg.l-1).

The spraying of both potassium and ascorbic acid carried out twice per season, first two week after growth began, second month later.

Results indicate that spraying potassium at 10g.l-1 significantly increased leaf area, leaf dry weight, chlorophyll content, fruit weight, fruit flesh weight and fruits quality include fruit length, fruit width and TSS %.

Ascorbic acid at 400mg.l-1 significantly increased all vegetative growth, physical and chemical fruits properties except seed weight and TSS %.

Maximum values (38.77cm2, 0.184g, 60.32g, 8.533g, 1.903g, 3.40mm, 3.03mm and 16.25%) of leaf area, leaf dry weight, fruit weight, fruit flesh weight, fruit length, fruit width and TSS respectively were resulted from the interaction of 10 g.l-1 potassium + 400mg.l-1 Ascorbic acid compared to minimum values with untreated trees .