تأثير الرش بالكايتوسان في الحاصل و الصفات الفيزيائية و الكيميائية و الفسلجية لثمار نخيل التمر Phoenix dactylifera L. صنفي البرحي و البريم

الملخص EN

The present study was conducted on date palm fruits, cvs.

Barhi and Bream during the growing season 2014.

The aim of the study was to investigate effects of spraying chitosan at the concentrations of 0% , 1% , 2% on yield and some physical , chemical and physiological characteristics of fruits.

The experiment included 9 trees for both cvs.

Complete Randomized Block Design was used with three replicates .

The results were analyzed by the analysis of variance of factorial experiment and mean values were compared using the Revised Least Significant Difference Test at 0.05 probability level .The results of study showed significant effect of spraying chitosan at the concentrations of 2% on the most of the studied parameters (length , diameter , fresh weight , size of fruits , yield , water content, total acidty and yield in addition to delay the ripening of fruits for both cvs.

Untreated fruits retain the highest percentage of total soluble solids , total sugars , reducing sugars and total protein.

Invertase and cellulase activities decreased in fruits treated with chitosan as compared with untreated fruits which recorded the highest activity of invertase and cellulase for both cvs.