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http://dx.doi.org/10.7745/KJSSF.2011.44.6.1118

Rice Yield and Changes of Available Silicate in Paddy Soils from Long-term Application of Chemical Fertilizers and Soil Amendments  

Kim, Myung-Sook (National Academy of Agricultural Science)
Kim, Yoo-Hak (National Academy of Agricultural Science)
Hyun, Byung-Keun (National Academy of Agricultural Science)
Yang, Jae-E. (Department of Biological Environment, Kangwon National University)
Zhang, Yong-Seon (National Academy of Agricultural Science)
Yun, Hong-Bae (National Academy of Agricultural Science)
Sonn, Yeon-Kyu (National Academy of Agricultural Science)
Lee, Ye-Jin (National Academy of Agricultural Science)
Ha, Sang-Keun (National Academy of Agricultural Science)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.44, no.6, 2011 , pp. 1118-1123 More about this Journal
Abstract
The changes of available silicate (Avail. $SiO_2$) contents in paddy soils (sandy loam) were assessed from data of the 41 years fertilization plots in which the continuous rice cropping experiment started in 1954 at the National Academy of Agricultural Science. The treatments were no fertilization (O), inorganic fertilization (NPK), inorganic fertilizer plus rice straw compost (NPK+C), inorganic fertilizer plus silicate fertilizer as a soil amendment (NPK+S), inorganic fertilizer plus rice straw compost and silicate fertilizer (NPK+CS) and inorganic fertilizer plus rice straw compost, silicate fertilizer and lime (NPK+CSL). Available silicate contents in NPK+S, NPK+CS and NPK in surface soil reached at the highest content ($255{\sim}330mg\;kg^{-1}$) after 41 years and then levelled off. Available silicate contents in subsurface soil (25~30 cm) were higher in NPK+C and NPK+S treatments than those in other treatments. Continuous application of silicate fertilizer affected significantly on the levels of available silicate in surface and subsurface soils. Silicate uptake of top rice was more increased by 98% in NPK+CS and NPK+CSL over NPK. Grain yield also increased by 37~47% in NPK+CS and NPK+CSL as compared to NPK. The combined applications of inorganic fertilizers with silicate as a soil amendment are recommended as the best fertilization practice for fertilizer use efficiency, enhancement of soil fertility status in the continuous rice cropping system in Korea.
Keywords
Long-term application; Available silicate; Paddy soil; Rice yield; Silicate fertilizer;
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