BEHAVIOR OF PHOSPHORUS IN PADDY SOILS OF THAILAND : I. Contents of Inorganic, Organic, and Available Soil P in Relation to Rice Plant P-Nutrition

概要

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analyses of the phosphorus content in soil and rice plant samples from paddy fields in Thailand showed that : 1) The contents of Org-P and Org-P/T-P were very low, 69 μg/g and 19% on the average, respectively. 2) Org-P contents were regulated by the T-P and T-C contents. 3) The low content of Org-P and Org-P/T-P was attributed to the larger extent of mineralization of Org-P under submerged conditions and higher rate of decomposition of organic matter in the tropics compared with the conditions in the temperate region. 4) The contents of available P differed remarkably between the soil groups and are highly correlated with the contents of Org-P as well as of Inorg-P. 5) P concentration in rice plants was correlated with certain P test values which differed between the coil groups and corresponded to the Inorg-P contents. It appeared that Org-P is a less important source of available P in Thailand than in the temperate region. 6) The content of available P in Fresh Water Alluvial soils and loamy Low Humic Gley soils depended more on the capacity factor of available soil P than on the intensity factor.
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