Effect of Growing Season and Fertilizer Application Rate on Yield of Rice cv. RD41 under Bang Nam Priao Soil Series
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Abstract
The objective of this study was to determine the time and the optimal amount of fertilizer rate on growth and yield components of early variety rice cv. RD41 under Bang Nam Priao soil series. The experiment was done at Chachoengsao Rice Research Center during rice planting time dry season (2016) and wet season (2017). The experimental design was split-plot in a randomized complete block that included two main plots (dry and wet seasons). The sub-plot was fertilizer rate seven treatments with three replications. The result found that time, fertilizer rate, and interaction between them significantly affected plant height during the age of 15-45 days after planting (p < 0.05). The rice grew in the wet season showed higher attitude than the dry season, about 61 %. Amount of nitrogen at the rate of 24-6-6 in wet season significantly increased plant height but decreased tillering. However, applying the same rate of fertilizer in the drying season significantly increased the tiller number to 42 % compared to the rate of 6-6-6. Nevertheless, time, fertilizer rate, and their interaction showed no effect on panicle length. Moreover, the result noted that panicle number, filled grain rate, 1,000-seed weight, and grain yield of rice cv. RD41 gained seven different fertilizer rates were not different. But, fertilizer at the rate of 12-6-6 in the wet season tended to increase the highest of rice grain yield (655 Kg/rai). Then, the rice farmer should consider the optimal fertilizer rates according to the conditions and environment in their area for achieving sustainable rice production.
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