ISHS Acta Horticulturae 171: I International Symposium on Water Relations in Fruit Crops
WATER RELATIONS AND NUTRITIONAL LEVEL OF LEAVES AND FRUITS OF APPLE |
| Authors: | B. Marangoni, P. Rossi Pisa |
| Abstract:
Thirteen-year -old apple trees (cv "Golden Delicious" grafted on M 7 rootstock) were investigated to determine the influence of different soil water regimes upon nutritional level (mineral and organic compounds). The trees were drip-irrigated daily (4 l/h). In three plots the soil was covered by means of a movable shelter (30 cm from the ground) to avoid rainfall interference. Three control plots without irrigation were provided. Soil moisture, weight and fruit mineral and organic compounds were determined during the growing season. Tissue analysis was carried out on leaves in the middle of July. Results showed the influence of water supply on total nitrogen and nitrate contents, mainly in the first few weeks after full bloom. The rate of increment of soluble carbohydrates and starch is dependent on the water regime. At harvest, soluble carbohydrates were higher in the fruit of non-irrigated trees, whilst they showed a different trend in their accumulation. Relationship between K and Ca contents on fruits was influenced by water regime. | |
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