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The present investigation was carried out during 3 successive seasons from 2008 to 2010. The work in the first year was considered as a preliminary trial. This investigation was conducted on 14-year-old King Ruby grapevines cultivar growing at a private vineyard called Chycheny located at meniet samanood village near Mansoura city, Dakahlia Governorate, Egypt. The study aimed to evaluate the effect of different sources of compost tea with or without citric acid on vegetative growth, leaf mineral content, physical and chemical characteristics of clusters and berries, yield and pruning wood weight. Most tested treatments gave generally a significant increase of different studied parameters especially in the second season of study, where, T7 (compost tea A + compost tea B + citric acid) gave the highest significant increase in shoot length and total chlorophyll content (112.1 144.6 cm), (1.013 0.957 mg/g F.W.) as compared with that of control (91.2 112.6 cm), (0.923 0.695 mg/g F.W.) in 2009 and 2010 seasons, respectively. In addition, T7 gave a significant increase of NPK content in the leaf petioles (2.94 and 2.72 N %), (0.43 and 0.43 P%) and (2.11 and 2.12 K%) as compared with that of control (2.39 and 2.37 N%), (0.27 and 0.27 P%) and (1.16 and 1.17 K%) in 2009 and 2010 seasons, respectively. Also, this treatment gave a pronounced increase in yield/vine (15.90 and 12.00 kg/vine) as compared with that of control (9.03 and 8.07 kg/vine) in 2009 and 2010 seasons, respectively. Same treatments gave higher increase in the total sugars and total anthocyanin content in berry skin (17.133 – 17.577 %), (45.85 – 50.14 mg/100g) as compared with that of control (14.19 and 14.56 %), (23.52 and 23.08 mg/100g) in 2009 and 2010 seasons, respectively. Also, T7 gave the highest values on weight of pruning wood at winter season (2.63 and 2.83 kg/vine) comparing with control (2.17 and 1.78 kg/vine) in 2009 and 2010 seasons, respectively.

USING DIFFERENT SOURCES OF COMPOST TEA ON GRAPES