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http://dx.doi.org/10.7745/KJSSF.2011.44.3.448

Estimation of Nitrogen Optimum Level for Rice Planting after Italian Ryegrass (Lolium multiflorum Lam.) Cultivation  

Song, Yo-Sung (National Academy of Agricultural Science, RDA)
Park, Woo-Kyun (National Academy of Agricultural Science, RDA)
Lee, Ye-Jin (National Academy of Agricultural Science, RDA)
Lee, Jong-Sik (National Academy of Agricultural Science, RDA)
Yun, Hong-Bae (National Academy of Agricultural Science, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.44, no.3, 2011 , pp. 448-451 More about this Journal
Abstract
To establish the optimum nitrogen level for rice planting after Italian ryegrass cultivation, one experiment was conducted on a normal paddy soil (Jeonbug series soil taxonomy) with six different nitrogen treatments for two years from 2009 to 2010. The treatments were including no nitrogen fertilization (Free N), 50%-Basal N, 75%-Basal N, 100%-Basal N, 150%-Basal N and 100% of basal fertilization with $30kg\;N\;ha^{-1}$ (100%+N30-Basal N) for decomposing of Italian ryegrass stubble. The highest rice yields were 8,420 obtained by 100%-Basal N. 150%-Basal N and 100%+N30-Basal N produced a rice yield of $8,190kg\;ha^{-1}$. Those of 50%-Basal N and Free N were produced 8,020 and $7,370kg\;ha^{-1}$, respectively. The correlation between rice yield and nitrogen treatment showed a quadratic relationship in high significant. According to this regression, the highest level of nitrogen treatment was $73kg\;ha^{-1}$ and the highest rice yield was $8,405kg\;ha^{-1}$. Nitrogen uptake rates were relatively higher with lower amounts of nitrogen fertilizer treated.
Keywords
Italian ryegrass; Rice planting; Nitrogen application rate;
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