P-sorption and desorption in Savanna Brazilian soils as a support for phosphorus fertilizer management

Ciência e Agrotecnologia

Flávio Araújo Pinto²  Edicarlos Damacena De Souza¹  Helder Barbosa Paulino¹  Nilton Curi¹  Marco Aurélio Carbone Carneiro¹ 

[1] ,Universidade de São Paulo Escola Superior de Agricultura Luiz de Queiroz Piracicaba SP ,Brasil

关键词: Phosphorus adsorption capacity;    langmuir;    soil fertility management;    correction of P deficiency;    Capacidade de adsorção de fósforo;    langmuir;    manejo da fertilidade do solo;    correção da deficiência de P;   

DOI  :  10.1590/S1413-70542013000600005

来源: SciELO

【 摘 要 】

Phosphorus (P) sorption by soils is a phenomenon that varies depending on soil characteristics, influencing its intensity and magnitude, which makes it a source or drain of P. The objective of this study was to determine the Maximum Phosphorus Adsorption Capacity (MPAC) and desorption of P from soils under native Savanna Brazilian and verify the correlation between MPAC and P Capacity Factor (PCF) with the chemical and physical properties of these soils. The study was conducted in seven soils under native Savannas. The Langmuir isotherms were adjusted from the values obtained in sorption assays, being evaluated the MPAC, the energy adsorption (EA) and PCF, which was calculated according to the levels of P-adsorbed and P-sorbed. Values of MPAC were classified as high in most soils, ranging from 283 up to 2635 mg kg-1 of P in the soil and were correlated with soil organic matter, clay, silt, sand, base saturation and pH. The PCF was higher in soils where the MPAC was also higher. The use of only one attribute of soil (clay content) as a criterion for the recommendation of phosphated fertilization, as routinely done, is susceptible to errors, needing the use of more attributes for a more accurate recommendation, as a function of the complexity of the interactions involved in the process.

【 授权许可】

CC BY   
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