تأثير التسميد باليوريا و السماد العضوي و الرش بحامض الجبرليك في نمو شتلات الإجاص Prunus salicina

Abstract EN

This study was carried out in the nursery of the Department of Horticulture and Landscape Design / College of Agriculture and Forestry / University of Mosul / Iraq, during the growth season of 2018, to study the effect of three levels of nitrogen fertilization (0, 1 and 2 ) g.

of urea.

transplant -1).

Addition of two concentrations of organic fertilizer ( Nutri green ) in a liquid state they are (zero and 4 ) cm3.

l-1.

And foliar spray of two concentrations of gibberellic acid (zero and 50 ) mg GA3.

l-1, and the study of all possible interactions among the three factors under study.

The most important results obtained that nitrogen fertilization has a clear role increasing in the characteristics of the studied vegetative growth.

Addition of (2 g.

of urea.

transplant -1) has resulted in obtaining the highest averages in the height of the main stem, the area of the leaf, the number of branches.

transplant -1, and the leaf area of transplants, while the highest diameter of transplants was recorded from the addition of (1g.

of urea.

transplant -1).

The results data assured that organic fertilization has a significant effect on increasing the height of the main stem and the leaves area of the transplants.

The gibberellic acid spraying had a significant effect on the increasing in transplants leaves area.

The interaction between the studied factors showed a clear effect on the improvement of most vegetative characteristics.

The data of the triple interaction among the levels of nitrogen and organic fertilization and foliar spray with the gibberellic acid, had a significant effect on all studied characteristics.

The treatment (2 g.

urea.

transplant -1 + 4 cm3 nutri green.

l -1 + zero GA3.

l-1) gave a significant increase in the rates of the height of the main stem and the diameter of the transplants, number of the leaves, whereas the treatment (1 g.

urea.

transplant -1.

+ zero cm3 nutri green + 50 mg.

GA3.

l-1) gave a significant increase in the proportion of budding able transplants.