EFFECT OF SOME GROWTH REGULATORS AND FERTILIZING ON GROWTH AND FRUITING Off (VITIS VINIFERA L.) GRAPEVINES

Abstract

The present study was carried out during two consecutive seasons of ( 1993 I 1994) and 1994 I 1995) on 12 years old Thompson Seedless t,rrapevines, t,rrowing in a clay loamy soil in a private vineyard at Samannud region Gharbia Govemorat, Egypt to study the effect of some growth regulators i.e. Dormex (H2 CN2), GA3 and NAA and nutrient elements i.e Zn S04 , KN03 and urea,on growth and fruiting of Seedless grapevines. The study was dealing with spraying the donnant one year old wood

only canes after pruning with the following growth regulators and nutrient solutions. 1- Control (vines were sprayed with water).

2- Donnex (H2 CN2) at 1.25%. 3- Donnex (H2 CN2 ) at 2.5% .

4- Donnex (H2 CN2) at 5% . 5- GA3 at 50 ppm.

6- GA3 at 1000 ppm. 7- NAA at 25 ppm.

8- NAA at 250 ppm.

1 0- Zn S04 at 25% .

9- KN03 at 5% .

11- Urea at 1 0 %.

The above treatments were sprayed once at the following dates. On 15lli Dec., Jan., 1 at 15!1!. and Feb. 1§!. The experiment was designed according to the randomized completely block design to study the following 1-The effect of these treatments on the phonological phases of the

grapevines i.e. Time of the begining ofbudburst, begining of blooming end of blooming, begining of ripening stage (Veraison) and date of harvesting date. 2-The buds free ammo acids, total soluble and non-soluble sugars.

contents.

3-Bud behaviour (budburst percentage, fruitful shoots %and number of clusters per vine). 4- Yield per vine.