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Determination of Optimum Rate and Interval of Silicate Fertilizer Application for Rice Cultivation in Korea  

Song, Yo-Sung (National Institute of Agricultural Science and Technology, RDA)
Jun, Hee-Joong (National Institute of Agricultural Science and Technology, RDA)
Jung, Beung-Gan (National Institute of Agricultural Science and Technology, RDA)
Park, Woo-Kyun (National Institute of Agricultural Science and Technology, RDA)
Lee, Ki-Sang (National Institute of Agricultural Science and Technology, RDA)
Kwak, Han-Kang (National Institute of Agricultural Science and Technology, RDA)
Yoon, Jung-Hui (National Institute of Agricultural Science and Technology, RDA)
Lee, Choon-Soo (National Institute of Agricultural Science and Technology, RDA)
Yeon, Byeong-Yeol (National Institute of Crop Science, RDA)
Kim, Pil-Joo (Gyeongsang National University)
Yoon, Young-Sang (Kongju National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.5, 2007 , pp. 354-363 More about this Journal
Abstract
In order to investigate the optimum rate and interval of silicate fertilizer application for rice cultivation, Chucheong byeo variety, one of commonly cultivated rice cultivar in Korea was planted on two different wetland rice soils located on Hwaseong-si from 2002 to 2005; Jisan series(a member of the fine loamy, mixed, mesic family of Fluvaquentic Endoaquepts), known as "Productive Paddy Soil", without any conspicuous limiting factor, and Seokcheon series (a member of the coarse loamy, mixed, nonacid, mesic family of Fluvaquentic Endoaquetps), known as "Sandy Paddy Soil", sandiness being major limiting factor. There were three rate treatments of silicate fertilizer application; the amount of silicate fertilizers needed to adjust the available soil silicate contents to 130, 200, and $270mg\;kg^{-1}$ was applied, in the first year only. There was an additional plot; applying the amount of silicate fertilizer needed to adjust soil available silicate to 130 ppm every year, which would serve as the base for the evaluation of residual effects of silicate fertilizers in the plots where different rates of silicate fertilizer were applied. From the yield data in first year, it was found that optimum available silica in the soil are $154mg\;kg^{-1$ and $160mg\;kg^{-1}$, in Jisan and Seogcheon soils, respectably. The duration of residual effects of silicate fertilizer was different depending upon the amount of applied silicate fertilizers and the soils. The higher the application rate, the residual effect lasted longer, and the residual effect was lasted longer in Jisan(clay loam) soil than in Seogcheon(sandy loam) soil. During four years, sum of the rate of contribution to increase available soil silica of applied silicate fertilizer in different soils ranged 18.6% and 24.1% in Jisan soil and Seogcheon soil, respectively. This may suggest that much portion of applied silicate would be either lost from the soil or remain in the soil as insoluble form. This deserves further study.
Keywords
Rice; Silicate fertilizer; Application rate; Application interval;
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