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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921


ALVES, Marcelo Eduardo  and  LAVORENTI, Arquimedes. Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies. Pesq. agropec. bras. [online]. 2004, vol.39, n.3, pp.241-246. ISSN 0100-204X.

The remaining phosphorus (Prem) has been used for estimating the phosphorus buffer capacity (PBC) of soils of some Brazilian regions. Furthermore, the remaining phosphorus can also be used for estimating P, S and Zn soil critical levels determined with PBC-sensible extractants and for defining P and S levels to be used not only in P and S adsorption studies but also for the establishment of P and S response curves. The objective of this work was to evaluate the effects of soil clay content and clay mineralogy on Prem and its relationship with pH values measured in saturated NaF solution (pH NaF). Ammonium-oxalate-extractable aluminum exerts the major impacts on both Prem and pH NaF, which, in turn, are less dependent on soil clay content. Although Prem and pH NaF have consistent correlation, the former has a soil-PBC discriminatory capacity much greater than pH NaF.

Keywords : ammonium-oxalate-extractable Al; phosphate adsorption; phosphorus buffer capacity.

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