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Evaluation of Available Soil Silicon Extracting Procedures for Oriental Melon  

Cho, Hyun-Jong (Division of Life and Environmental Science, Daegu University)
Choe, Hui-Yeol (Division of Life and Environmental Science, Daegu University)
Lee, Yong-Woo (Division of Life and Environmental Science, Daegu University)
Chung, Jong-Bae (Division of Life and Environmental Science, Daegu University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.37, no.4, 2004 , pp. 251-258 More about this Journal
Abstract
Soil testing for silicon (Si) in the upland soils has not been sufficiently investigated. The objective of this study was to identify a suitable Si extraction method for upland soils of oriental melon (Cucumis melo L.). Thirty-eight surface soil samples and matured leaf samples were collected from plastic film houses in Sungju, Gyeongbuk province. In the laboratory, six different methods were used for extracting Si from the soils. The methods included 0.5 N HCl extraction, 1 N sodium acetate buffer (PH 4.0) extraction, citric acid 1% extraction, water extraction, Tiis buffer pH 7.0 extraction, and extraction after incubation with water for 1 week. The concentration of dissolved Si in soil extracts from all methods was determined colorimetrically. With 1 N sodium acetate buffer extraction, as the available soil Si increased, the concentration ofSi in oriental melon leaf increased until around $14g\;SiO_2\;kg^{-1}$ was reached in the form of a saturation curve. Also, among the methods studied, extraction with 1 N sodium acetate buffer was the only method provided a significant linear correlation with oriental melon leaf Si content in the range of extractable soil Si lower than the level which inducing Si saturation in oriental melon leaf. These results indicate that 1 N sodium acetate buffer extraction procedure is the best soil Si test method for upland soils of oriental melon. This sodium acetate buffer extraction procedure is rapid and quite well acquainted with scientists and farmers, since the method has been used for routine paddy soil testing.
Keywords
Silicon; Available silicate; Soil test; Oriental melon;
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