Mahmoud Al-Shihadat^*(1)

(1). Administration of Horticulture Research, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.

(*Corresponding author: Dr. Mahmoud Al-Shihadat. E-Mail: mahmod.h.sh@hotmail.com

Received: 31/05/2016                           Accepted: 19/06/2016

Abstract

The experiment was carried out on vineyard with 10 years old grapevines of cultivar Al-Helwani (Vitis vinifera L.), which grown in Daraa governorate, during three seasons (2008, 2009 and 2010) to study the effect of organic, mineral fertilization rates and the application depth of triple superphosphate (T.S.P) on the phenological phases of grapes. Three mineral fertilizer rates of (N. P. K) were used, i.e., 75-25-50, 150-50-100, and 300-100-200 Kg/ha. The triple super-phosphate was added by broadcast on the soil surface, and in depth of 30 cm, in three replications, in addition to a control without fertilization. Besides the addition of dried granulated manure in January. The results showed that there was no significant effect to the addition of compost and depth phosphate fertilization on the length of flowering stage, and there were no significant differences among the treatments that used. While a significant decrease was achieved in the length of the flowering stage with the addition of NPK fertilization, with the rates of 1.1, 1.08, and 1.05% for the first, second, and third rates, respectively. The results also clarified a delay in maturity with the addition of compost as compared with control (P≥0.05), while in terms of phosphate depth addition, there were significant differences between the treatments on maturity. The maturity was earlier (70 days) when superphosphate was broadcasted, and the maturity took more days (73 days) when was added in depth of 30 cm. The maturity took more time (74 days) with the addition of the third rate of superphosphate significantly. The maturity took (68 days) with the addition of the first rate of superphosphate, while the length of maturity was about (71) days in control.

Key words: Grapevine, Al-Helwani, Phenological phases, Phosphate fertilizer, Organic fertilization.

Full paper in Arabic: PDF