Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

Pesquisa Agropecuária Brasileira

Marcelo Eduardo Alves¹  Arquimedes Lavorenti¹ 

[1] ,Escola Superior de Agricultura Luiz de Queiroz Dep. de Ciências Exatas Piracicaba SP ,Brazil

关键词: ammonium-oxalate-extractable Al;    phosphate adsorption;    phosphorus buffer capacity;    alumínio extraível com oxalato;    adsorção de fosfato;    fator capacidade de fósforo;   

DOI  :  10.1590/S0100-204X2004000300006

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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