A comparison of 5 soil phosphorus extraction methods applied to different soils of South of Iran |
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| Authors: | Roghayeh Shahriaripour Ahmad Tajabadipour Isa Esfandiarpoor Vahid Mozafary |
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| Institution: | Department of Soil Science, University of Rafsanjan, Rafsanjan, Iran |
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| Abstract: | Phosphorus (P) fertilization is commonly based on soil testing, for which a variety of different soil P extraction methods are in use. In this research, the correlation and calibration of five extraction techniques for available P were studied: Soltanpour and Schwab, Olsen, EDTA-Na2, Paauw and Morgan in 168 different soil samples from 63000 ha of Sirjan pistachio orchards of Kerman province, Iran. The Morgan reagent extracted the most P and then EDTA-Na2> Olsen> Soltanpour and Schwab> Paauw extracted more phosphorus, respectively. Positive and significant correlation (P < 0.05) existed among all extractants. The correlation coefficients between different extractants and plant P concentration indicated that, EDTA-Na2 (P < 0.01), Olsen and Paauw methods (P < 0.05) had positive and significant correlation with leaf P concentration and thus with due attention to acceptable relationship with plant indices, the Olsen and EDTA-Na2 methods could be used to advise on available P. |
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| Keywords: | Correlations extractants pistachio trees plant phosphorus soil phosphorus |
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