Effect of Manganese on Growth and Development of Lychee
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Abstract
The effect of manganese on growth and development of lychee (Litchi chinensis Sonn.) cv. Jakrapad were conducted. The two years old lychee trees were grown in 100 liter pot filled with fine sand during October 1995 to March 1997 at the Department of Horticulture, Faculty of Agriculture, Chiang Mai University. In this study, the concentrations of manganese were 2.18, 4.18, 6.18, 8.18 and 10.18 ppm. It revealed that manganese at all treatments showed no significant difference in number of both perfect and male flowers per inflorescence.
Manganese affected the mineral content of the leaves, at higher rate of concentration caused an increase of nitrogen and thus potassium content accumulated significantly. But at any rates there were no influence on phosphorus, manganese and iron contents.
The observations of this studies were found that the high concentrations of manganese caused in toxicity on lychee trees. At 6.18 ppm. reduced leaf size, curled and thick leaves, hairy leaves on the lower surface. Whereas at 10.18 ppm., caused chlorosis and necrosis on the leaves.
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