Relationships between labile organic matter and nitrogen meneralization in Japanese agricultural soils with reference to land use and soil type
2006
Sano, S.(Kyoto Univ. (Japan)) | Yanai, J. | Kosaki, T.
The relationship between the amount of organic matter determined using various extraction methods and the nitrogen mineralization potential (Nsub(0)) in soil was examined with reference to land use (upland and paddy soils) and soil type (non-volcanic and volcanic soils). Surface soils were collected from agricultural lands all over Japan (n=72). Seven methods of extracting labile organic matter were used: water extraction (WE), hot water extraction (HE), extraction using an autoclave (AU), phosphate buffer extraction (PB), sulfuric acid extraction (SA), separation of light fraction (LF) and permanganate oxidation (PM). Significant relationships were observed between Nsub(0) and the content of organic N (OrgN) when the WE, AU, PB and LF methods were applied for all soil samples. Higher correlation coefficients were obtained for groups of similar soil samples in terms of land use and soil type. Namely, for the upland non-volcanic soils, PB-OrgN (r=0.66**,**P0.01) and SA-OrgN (r
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