Effects of Controlled-Release Urea on Growth and Yield of Rice Varieties Pathum Thani 1 and RD41
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Abstract
Fertilizer application in paddy fields normally uses chemical fertilizer with a high rate and many times of applications. These may cause the leaching of fertilizer and a lack of nutrients for the rice plant. It has been reported that controlled-released fertilizer (CRF) could increase fertilizer use efficiency. However, the information on rice was limited. Therefore, this research aimed to determine the effects of CRF on the growth and yield of rice varieties Pathum Thani 1 and RD41 which were grown under paddy field conditions. Three treatments, including twice applied of uncoated fertilizer (N-P2O5-K2O = 23-9-13) at 50 kg/rai (F-50), once applied as basal fertilizer of CRF at 50 (CRF-50) and 37.5 kg/rai (CRF-37.5). The results found that the yield of both varieties applied with CRF at 50 kg/rai was higher than those applied with uncoated fertilizer at the same rate. Moreover, the application of CRF-37.5 had no significant difference in Pathum Thani 1 when compared with F-50. While it gave a higher yield in RD41. In addition, the decrease in fertilizer rating did not have negative effects on rice growth. The information from this research can be used as a guideline for efficient fertilizer management in the rice field.
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