RESPONSE OF THOMPSON SEEDLESS AND ROUMI RED GRAPE CULTIVARS TO FOLIAR SPRAYS WITH YEAST EXTRACT AND GA3
Faten, H.M.Ismaeil*; M.T. Wahdan** and A.F. El-Sheikh**
*Agric.Botany Dep. Agric. Fac. Moshtohor, Zagazig Univ.
**Hort. Dep. Agric. Fac.Suez chanal Univ.
ABSTRACT
Yeast extract (100 and 200 ml/L) and GA3 (20 and 40 ppm) were foliar sprayed on Thompson Seedless and Roumi Red grape cultivars. The treatments were done before flowering (2nd week of April) and at full bloom (1st week of May). Fruit set (%) and number of clusters/vine of both cultivars were increased significantly. In addition, yield was increased as a result of cluster weight, length and berries weight. Number of berries/cluster also improved significantly by yeast extract + GA3 and yeast extract treatment alone for “Thompson Seedless” and “Roumi Red”, respectively.
All treatments increased juice percentage of “Thompson Seedless” berries, however, juice content of “Roumi Red”, soluble solids content (SSC), SSC/acid ratio and total sugars were increased while acidity decreased significantly for both cultivars.
The combination of yeast extract at 100 ml/L and GA3 at 40 ppm is recommended for improving yield and fruit quality of Thompson Seedless and Roumi Red grape cultivars. |
