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Journal of Biological Sciences

Year: 2001 | Volume: 1 | Issue: 10 | Page No.: 908-911
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Research Article

Extractable Phosphorus in a Range of Bangladesh Soils and its Critical Limits for Chickpea

A. B. M. S. Islam, M. Q. Haque, M. H. Rahman, M. A. Hoque and M. K. Alam

ABSTRACT

The experiment was conducted at BINA net house with 17 extensively cultivated soils of Bangladesh to evaluate P extractability of four extractants and to determine its critical limit for chickpea. The soils were analyzed for P status by four extraction methods. The mean extractable P in soils was found to be in the order of Nelson > Olsen > Hunter > Bray. Influence of soil pH was the most dominant factor in P extraction. For the soils with low pH (<6.0), the amounts of P removed by different extractants except Bray-P were positively correlated with organic matter content whereas such correlation was negative for high pH soils (>6.0) indicating the stability of phosphorus organic matter complex formation at elevated pH. Dry matter yields were remarkably increased with addition of increasing rate of phosphatic fertilizer and the soils having low extractable P responded better to the applied P. In high pH soils, dry matter yield gave a positive relationship with extractable phosphorus. The P content and P uptake were also positively and significantly correlated with extractable P in these soils. In all and low pH soils, relative dry matter yield was positively correlated with extractable P, whereas such correlation was negative in high pH soils. The critical limit of soil extractable P for chickpea for Olsen, Bray, Nelson and Hunter extraction methods was found to be 14.0, 9.0, 23.0 and 11.0 (graphical approach) and 14.5, 12.5, 23.0 and 15.0 ppm (statistical approach) respectively.
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