Characterization and grouping of paddy soils in Shiga Prefecture with reference to clay minerals and microbial biomass
2009
Nishibori, Y.(Shiga-ken. Agricultural Technology Promotion Center, Azuchi (Japan)) | Shibahara, F. | Takehisa, K. | Kitagawa, Y. | Kyuma, K.
Representative paddy soil samples from fifty points in Shiga Prefecture were analyzed for clay mineral composition and microbial biomass to characterize the prefecture's paddy soils, including general physicochemical properties. The soils were grouped to facilitate multiangle utilization of soil functions, including food production and environmental conservation. 1) The amount of microbial biomass in soils ranged from 343 to 1,653 mg C/kg (mean=742) for carbon and from 45.0 to 216.7 mg N/kg (mean=86.5) for nitrogen, depending on soil type and manuring practice. Soil grain size distribution and clay mineral composition seemed to be related to the geographical process of formation of Lake Biwa and lowlands. 2) Component analysis extracted three primary components (PCs): PC1 representing organic and biological characteristics, PC2 representing clay quality and base status, and PC3 representing available phosphate. 3) Cluster analysis identified four types of paddy soil in Shiga Prefecture according to organic matter and clay mineral component properties and compositions.
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