Optimum Nitrogen Application Amount of Rice Transplanting Cultivation in Newly Reclaimed Land
2014
Choi, W.Y., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Jeong, J.H., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Kim, S., National Institute of Crop Science, RDA, Jeonju, Republic of Korea
This study was conducted to identify the optimal nitrogen amount of rice transplanting cultivation in newly reclaimed land, in light of minimum salt damage and high yield of rice. The nitrogen amount treatments were 11 kg/10 a, 14 kg/10 a, 17 kg/10 a, 20 kg/10 a and diagnostic fertilization. The average of soil salinity fell from 0.06% to 0.03% during 2 years after flooding and rice transplantation. The heading date was August 16 nitrogen at rate of 11 kg/10 a and 14 kg/10 a, August 17 at 17 kg/10 a and 20 kg/10 a. The lodging index tended to rise in proportion to nitrogen application amount; any of rice plants were not lodged at 11 kg/10 a, but the lodging index was 1 and 3 at 14 kg/10 a and 17 kg/10 a respectively. At 20 kg/10 a, however, over half of rice plants were lodged with the lodging index 7. The panicle number per hill was the highest at 17 kg/10 a, followed by the diagnostic fertilization, 20 kg/10 a, 14 kg/10 a and 11 kg/10 a. The percentage of ripened grains was similar to the weight of 1,000 grains of brown rice, and thus the rice yield was the highest at the diagnostic fertilization and at 17 kg/10 a equally, followed by 14 kg/10 a, 20 kg/10 a and 11 kg/10 a. The percentage of perfect kernels was the highest at 14 kg/10 a, followed by the diagnostic fertilization and 11 kg/10 a, 17 kg/10 a, and 20 kg/10 a. The amylose content was not significantly different by nitrogen application amount, but the protein content was closely correlated with it. Altogether, the optimal nitrogen application amount was found to be 16 to 18 kg/10 a on the premise that rice seedlings would be mechanically transplanted in newly reclaimed land.
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