RESULTS AND DISCUSSION Climatic conditions: The climatic data of monthly mean rainfall, maximum and minimum air temperatures
in Table 1. Total precipitation, monthly mean minimum and maximum temperature during the experimental period in 2006 and 2007 were 1,415.5; 1,151.0 mm; 16.0; 24.7 C; 30.9; 36.2 C, respectively. Climatic o o conditions in the Northeast Thailand were generally considered to be good for Napier grass growth and forage yielding. The climatic data of the present study are consistent with Cook et al. (2005) and JLTA (1996) who quoted that the optimum growth temperature of Napier grass is between 25-40 C and little growth below o about 15 C, with stop growing at 10 C, but re-grow with o o onset of warm and moist condition. During this study the temperature declined to 16 C during December, 2006 to o January, 2007 and in some days closed to 10 C, which o are likely to be having a major affect on stop growing of the grass. After then the maximum temperature at 36.2 C and 36.1 C. in March and April, 2007, o o respectively. The grass may storage carbohydrate in subterranean stem and regrowth very fast due to the optimum temperature, water supply and cattle manure application at that time.
RESULTS AND DISCUSSION Climatic conditions: The climatic data of monthly mean rainfall, maximum and minimum air temperatures
in Table 1. Total precipitation, monthly mean minimum and maximum temperature during the experimental period in 2006 and 2007 were 1,415.5; 1,151.0 mm; 16.0; 24.7 C; 30.9; 36.2 C, respectively. Climatic o o conditions in the Northeast Thailand were generally considered to be good for Napier grass growth and forage yielding. The climatic data of the present study are consistent with Cook et al. (2005) and JLTA (1996) who quoted that the optimum growth temperature of Napier grass is between 25-40 C and little growth below o about 15 C, with stop growing at 10 C, but re-grow with o o onset of warm and moist condition. During this study the temperature declined to 16 C during December, 2006 to o January, 2007 and in some days closed to 10 C, which o are likely to be having a major affect on stop growing of the grass. After then the maximum temperature at 36.2 C and 36.1 C. in March and April, 2007, o o respectively. The grass may storage carbohydrate in subterranean stem and regrowth very fast due to the optimum temperature, water supply and cattle manure application at that time.
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