The efficiency of phosphorus extractants for a soil treated with phosphatic fertilizers and cultivated to rice
DOI:
https://doi.org/10.1590/S0103-90161995000300025Keywords:
Available soil-P, uptaken-P, extractants-P, rock phosphate, soluble-phosphate, rice, Oryza sativaAbstract
In order to assess the efficiency of several extracting procedures for soil phosphorus a pot experiment was carried out using a Red Yellow Latosol. Previously two successive croppings had been made, P fertilizers being applied only in the first one. The following products were used at the rates of 50 and 150 mg.kg-1 soil: Yoorin (thermo-phosphate), "Fosmag", Araxa and Gafsa rock phosphates. Mehlich-1, Bray-1, anion exchange resin, and isotopic dilution ("E" value) methods were used as extracting procedures of available soil-P. The closest correlations between soil - P and either dry matter yield or phosphorus taken up by the rice plant were found with Bray-1 (r = 0.92) and resin (r = 0.91). Phosphorus determined by Mehlich-1 extracting solution showed high correlation with plant parameters (r = 0.96) only when the Araxa rock phosphate treatments were excluded from the calculation. High correlations (r = 0.98) were found between the values corresponding to Bray-1 and resin methods.Downloads
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Published
1995-12-01
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All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.How to Cite
The efficiency of phosphorus extractants for a soil treated with phosphatic fertilizers and cultivated to rice . (1995). Scientia Agricola, 52(3), 561-568. https://doi.org/10.1590/S0103-90161995000300025