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Reducing Nitrogen Fertilization Level of Rice (Oryza sativa L.) by Silicate Application in Korean Paddy Soil  

Lee, Chang-Hoon (Division of Applied Life Science, Gyeongsang National University)
Yang, Min-Suk (Division of Applied Life Science, Gyeongsang National University)
Chang, Ki-Woon (Department of Agricultural Chemistry, Chungnam National University)
Lee, Yong-Bok (Division of Applied Life Science, Gyeongsang National University)
Chung, Ki-Yeol (Plant Environment Division, Yeongnam Agricultural Research Institute)
Kim, Pil-Joo (Division of Applied Life Science, Gyeongsang National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.38, no.4, 2005 , pp. 194-201 More about this Journal
Abstract
Silicate (Si) fertilizers are well-known for soil amendment and to improve rice productivity as well as nitrogen efficiency. In this study, we investigated the possible reduction level of nitrogen fertilization for rice cultivation by amending Si fertilizer application. Field experiments were carried out to evaluate the productivity of rice (Oryza sativa L.) on a silt loam soil, where three levels of nitrogen (0, 110 and $165kg\;ha^{-1}$) were selected and Si fertilizer as a slag type was applied at 0, 1 and 2 times of the recommendation level (available $SiO_2\;130mg\;kg^{-1}$). Application of Si fertilizer increased significantly the rice yield and nitrogen efficiency. With increasing N uptake of rice, 1 and 2 times of recommended levels of Si fertilization could decrease nitrogen application level to about 76 and $102kg\;N\;ha^{-1}$ to produce the target yield, the maximum yield in the non-Si amended treatment. Silicate fertilizer improved soil pH and significantly increased available phosphate and Si contents. Conclusively, the Si fertilizer could be a good alternative source for soil amendment, restoring the soil nutrient balance and to reduce the nitrogen application level in rice cultivation.
Keywords
Silicate; Nitrogen; Rice; Paddy soil; Nitrogen efficiency;
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