Effect of Spraying Ascorbic Acid, Citric Acid and Yeast on Vegetative Growth, Yield and Fruit Quality of 'Florda prince'1 Peach Grown in NewReclaimed Land

摘要

The present experiment has been conducted during the two seasons of 2009 and 2010 on 9-years old "Florda prince" peach trees budded on "Nemagurd" rootstock grown in sandy new reclaimed land at EL-Nubaria, Behera Governorate. Treatments included ascorbic acid at 50 and 100 ppm, citric acid at 50 ppm and 100 ppm and yeast at 2 and 3 g/L were sprayed once at full bloom or twice at full bloom and after fruit set, also, each compound was sprayed alone. The results mentioned that, the treatments of ascorbic acid at 50 ppm, citric acid at 50 ppm and yeast at 2g/L. increased significantly shoot length and leaf area as compared to the control (unsprayed trees). Also, the highest fruit yield was resulted from the application of yeast twice at 3 g/1, while thelowest fruit yield was gained from the control trees. Furthermore, in general, all treatments increased weight, dimensions, firmness, TSS, acidity %, T.S.S. / acid ratio, vitamin c and total sugars in fruits of "Florda prince" peach. However, the most effective treatment for increasing growth and yield as well as improving fruit quality was found from yeast at 3 g/L (twice application) in the two seasons of study as compared with the control treatment which recorded the lowest growth, fruit yield and quality values