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International Journal of Botany

Year: 2007 | Volume: 3 | Issue: 2 | Page No.: 179-187
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Authors

Mahmoud M. Shaaban

Otmar Loehnertz

Mohamed M. El-Fouly

Keywords

Research Article

Grapevine Genotypic Tolerance to Lime and Possibility of Chlorosis Recovery through Micronutrients Foliar Application

Mahmoud M. Shaaban, Otmar Loehnertz and Mohamed M. El-Fouly
Pot experiment was conducted in the greenhouse of Soil Science and Plant Nutrition Department, Geisenheim, Germay with 3 Egyptian and 3 German grapevine cultivars grown under low (1.5%) and high (20%) carbonate in the soil. The experiment aimed at studying the capacity of different grapevine cultivars to macro- and micronutrient utilization under high soil carbonate conditions and how far micronutrients foliar application can recover lime-induced chlorosis. Data revealed that high lime content of the soil caused depression of total concentrations of nitrogen, phosphorus, iron and manganese in the leaves of all cultivars and decreased magnesium, zinc and copper in leaves of Egyptian cultivars. Potassium and calcium concentrations in the leaves were increased as an effect of high lime in the soil. Acid soluble iron concentrations were decreased with the plant age, however decreases were more severe in the leaves of cultivars grown under high lime conditions, especially for the Egyptian cultivars. Acid soluble iron was mostly proportional to total chlorophyll content in the leaves and the German cultivars were more resistant to chlorosis than the Egyptian cultivars. Micronutrients foliar applications could increase acid soluble iron and zinc concentrations and consequently chlorophyll content of the leaves. The best treatment was the combination of iron, zinc and manganese.
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