Performance of extracting procedures in soil treated with several sources of phosphorus

Authors

  • R. Stefanutti USP; Centro de Energia Nuclear na Agricultura
  • T. Muraoka USP; Centro de Energia Nuclear na Agricultura
  • E. Malavolta USP; Centro de Energia Nuclear na Agricultura

DOI:

https://doi.org/10.1590/S0103-90161994000100017

Keywords:

phosphate fertilizers, extracting agents, available phosphorus

Abstract

In order to evaluate the direct and residual effects of ordinary granulated superphosphate as compared to magnesium thermophosphate (Yoorin), supplied at four rates (0,50,100 and 200 ppm), seven successive croppings were carried out in the glasshouse. Available phosphorus was assessed after the third, fourth and seventh harvest by using Mehlich 1, Bray 1, anión exchange resin and isotopic dilution (E value). The highest correlation coefficients between available P and either total dry matter or total P content was found to occur with data provided by Mehlich 1 and resin. Phosphorus extracted by Bray 1 as well as that estimated by the E value showed lower "r" coefficients.

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Published

1994-04-01

Issue

Vol. 51 No. 1 (1994)

Section

Earth Science

License

All content of the journal, except where identified, is licensed under a Creative Common attribution-type BY-NC.

How to Cite

Performance of extracting procedures in soil treated with several sources of phosphorus . (1994). Scientia Agricola, 51(1), 105-112. https://doi.org/10.1590/S0103-90161994000100017