Evaluation of Phosphorus Status of Some Upland Soils in Myanmar

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In order to evaluate the phosphorus status of upland soils in Myanmar, 26 upland and 8 lowland soil samples were collected form surface (0～15cm deep) and subsurface (15～30cm deep) layers at 17 different places on different parent materials in eastern, central and lower parts of Myanmar. Concentrations of total, available, organic, and inorganic P were considerably varied with soils with ranges of 132 to 1414, 1 to 135, 37 to 265, and 89 to1167mg P/kg, respectively. The concentrations were higher for the soils applied with P fertilizer in all of the four P parameters. In most soils, the available, organic and inorganic P concentrations depended on the concentration of total P. In the sequential fractionation, inorganic P was separated into soluble and loosely-bound P, Al-P, Fe-P, occluded P, and Ca-P in the slightly acid to neutral soils and into Ca_2-P, Ca_8-P, Al-P, Fe-P, occluded P, and Ca10-P in the neutral to slightly alkaline soils. In the former soils, the available P concentration was correlated with the concentrations of soluble and loosely-bound P, Al-P and Ca-P at the 1% significant level, and those pools were estimated as the main source for available P. In the latter soils, although Ca2-P, Ca8-P and Al-P were the predominant forms, the total P concentration was highly correlated with the concentrations of all forms of inorganic P, and total P was consequently considered to contribute to increase of plant-available P. Suitable crop selection or appropriate soil and fertilizer management practice was suggested depending on the phosphorus status of soils.
九州大学の論文

Evaluation of Phosphorus Status of Some Upland Soils in Myanmar

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