Phosphorus status of some paddy soils in Bangladesh |
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Authors: | Kazuhiko Egashira Jyuri Takenaka Sachiko Shuto Abu Zofar Md Moslehuddin |
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Institution: | 1. Faculty of Agriculture , Kyushu University , Fukuoka, 812-8581, Japan;2. Faculty of Agriculture , Kyushu University , Fukuoka, 812-8581, Japan;3. School of Agriculture, Kyushu University , Fukuoka, 812-8581, Japan;4. Department of Soil Science , Bangladesh Agricultural University , Mymensingh, 2202, Bangladesh |
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Abstract: | Abstract Phosphorus status of Bangladesh paddy soils covering the major paddy soil types was assessed in terms of parent materials and physiography. Total P concentration ranged from 172 to 604 mg kg?1 in the topsoil and from 126 to 688 mg kg?1 in the subsoil, and varied with the physiography to which the soils belonged. In most soils, the available P concentration was much higher for the topsoil than for the subsoil. The inorganic P concentration was higher than the organic P concentration, except for one soil series from the Old Himalayan Piedmont Plain, and was significantly and positively correlated with the total P concentration. Among the inorganic forms, only the concentration of Al-bound P showed a significant correlation with that of available P based on the Bray P-2 method in both topsoil and subsoil. In general, the P status was critically low in paddy soils of the terrace area. Normal growth of paddy rice in this area is expected to be difficult without application of P fertilizer. |
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Keywords: | Bangladesh paddy soil phosphorus status physiography |
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