تأثير الرش باليوريا و النفثالين حامض الخليك على الحاصل و جودة الثمار في أشجار العنبة Mangifera indica L.

الملخص EN

The present study was conducted at a private orchard in Abi El-Khssib district, Basrah Governorate during the growing season of 2003-2004 to investigate the effect of spraying urea fertilizer at the concentrations of 0 %, and 2 %, and 4 % and the growth regulator “naphthalene acetic acid, NAA” at the concentrations of 0 mg / l and 20 mg / l and 40 mg / l on yield and fruit quality of mango trees “Mangifera indica L.”.

The results of this study were as follows : 1- Foliar spray of mango trees with urea fertilizer at the concentration of 2 % resulted in significant increases in fruit length, seed fresh weight, fruit content of total acidity and reducing sugars, fruit skin content of chlorophyll A and total chlorophyll, whereas the increases were not significant in L / D ratio, moisture content and N concentration per fruit.

Spraying mango trees with the same fertilizer at the concentration of 4 % gave significant increases in the number and weight of fruits per tree and fruit content of sucrose, but the increases in yield per hectare and total sugars of fruit were insignificant.

The untreated trees had significant increases in fruit diameter, volume, fresh and dry weights, flesh fresh weight, vit.

C concentration and total soluble solids per fruit, fruit skin content of chlorophyll B and carotene, but the increase in the percentage of fruit juice was not significant.

2- Foliar spray of mango trees with NAA at the concentration of 20 mg / l gave significant increases in fruit diameter, volume, fresh and dry weights, flesh fresh weight, fruit content of total soluble solids, sucrose and total sugars.

Spraying mango trees with 40 mg / l NAA produced significant increases in the number and weight of fruits per tree, fruit length, moisture content, juice percentage, total acidity, vit.

C and N concentration per fruit, fruit skin content of chlorophyll B and carotene, but the increases were not significant in yield per hectare and L / D ratio.

The untreated trees had significant increases in seed fresh weight, fruit content of reducing sugars and fruit skin content of chlorophyll A and total chlorophyll.

3- The interaction between urea fertilizer and NAA growth regulator had influencail effects on mango trees.

The combination treatment of 0 % urea and 20 mg / l NAA gave significant increases in weight of fruits per tree and yield per hectare, fruit diameter, volume, fresh and dry weights, flesh fresh weight, fruit content of total soluble solids and sucrose, whereas the combination treatment of 0 % urea and 40mg / l NAA significantly increased moisture content, juice percentage and vit.

C per fruit, fruit skin content of chlorophyll B and carotene.

The combination treatment of 2 % urea and 0 mg / l NAA produced significant increases in fruit content of total acidity, reducing and total sugars and fruit skin content of chlorophyll A.

The combination treatment of 2 % urea and 20 mg / l NAA significantly increased fruit skin content of total chlorophyll, while the combination treatment of 2 % urea and 40 mg / l NAA recorded significant increases in fruit length and seed fresh weight but the increase in L / D ratio was not significant.

The combination treatment of 4 % urea and 20 mg / l NAA produced significant increases in the concentration of N and sucrose per fruit.

The combination treatment of 4 % urea and 40 mg / l NAA had a significant increase in total number of fruits per tree.