استجابة أشجار السدر للمعاملة بحامض الجبرليك و كلوريد الكالسيوم : أولا-تأثير الرش بحامض الجبرليك و كلوريد الكالسيوم في الحاصل و بعض الصفات الخضرية و الفيزيائية و الكيميائية و الفسلجية لثمار السدر صنف تفاحي Z . mauritiana Lam

Abstract EN

The present study was conducted on jujube trees "Ziziphus mauritiana Lam." , cv.

Tufahi during the growing season 2013 -2014.

The aim of the study will to investigate effects of spraying gibberellic acid at the concentrations of 25 mg/l , 50 mg/l and calcium chloride at the concentrations of 1% , 2% and their combinations on yield and some vegetative , physical , chemical , physiological characteristics of fruits.

The results of study showed significant effect of spraying gibberellic acid on all the studied parameters with the treatment of 50 mg/l gibberellic acid recording the highest significant increase in leaf area , total carbohydrates and the length , diameter , fresh weight , volume of fruits in addition to the water content, sucrose of fruits and the amount of yield.

Treatment of 2% calcium chloride gave the highest significant increase in vitamin C concentration, total carbohydrates of leaf and calcium and chloride concentrations in fruit.

Control treatment recorded the highest significant increase in dry mater , total soluble solids , total and reducing sugars, respiration rate and invertase and cellulase activities and carotene concentration in fruit skin .

The period after full bloom factor had a significant effect on the studied vegetative parameters with the period of 10/2/2014 recording the highest significant increase in leaf area, carbohydrates content.

The combination treatment of 50 mg/l gibberellic acid and the period of 10/2/2014 recording the highest significant increase in leaf area.

The combination treatment of 2% calcium chloride and the period of 10/2/2014 was superior in carbohydrates content while the combination treatment of untreated fruits and the period of 3/2/2014 gave the highest activity of cellulase.