Effects of Root Temperature on Growth and Development of Lychee
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Abstract
The effects of root temperatures at 15 °C, 20 °C and normal root temperature (average 26.2 °C) on growth and development of lychee (Litchi chinensis Sonn.) cv. Jakrapad were studied. The results revealed that the plants grown at the normal root temperature had more growth rate of height, canopy width and stem diameter than those of the other treatments (15 and 20 °C). The color of leaves at normal root temperature and 20 °C changed faster than at 15 °C. However, the plants grown at 20 °C and normal root temperature had more length of new shoot and diameter of terminal shoots than at 15 °C, but the root temperatures at 20 and 15 °C had more number of new shoots than those of the normal root temperature. The trees grown at 20 and 15 °C had higher flower emergence, percentage of fruit set than the normal root temperature. The nitrogen content of the leaves was higher when the plants grown at normal root temperature than the other treatments. However, the phosphorus contents of leaves at normal root temperature and 20°C were higher than 15°C, but the potassium content was not significantly different.
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