Data/hora: 16/06/2024 19:27:34

Provedor de dados: | 90
País: | Brazil
Título: | Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol
Autores: | Sato,Shinjiro; Comerford,Nicholas Brian.
Data: | 2005-10-01
Ano: | 2005
Palavras-chave: | Liming; Phosphorus bioavailability; Langmuir; Partition coefficients; Atlantic Forest.
Resumo: | Liming is a common practice to raise soil pH and increase phosphorus (P) bioavailability in tropical regions. However, reports on the effect of liming on P sorption and bioavailability are controversial. The process of phosphorus desorption is more important than P sorption for defining P bioavailability. However few studies on the relationship between soil pH and P desorption are available, and even fewer in the tropical soils. The effects of soil pH on P sorption and desorption in an Ultisol from Bahia, Brazil, were investigated in this study. Phosphorus sorption decreased by up to 21 and 34 % with pH increases from 4.7 to 5.9 and 7.0, respectively. Decreasing Langmuir K parameter and decreasing partition coefficients (Kd) with increasing pH supported this trend. Phosphorus desorption was positively affected by increased soil pH by both the total amount of P desorbed and the ratio of desorbed P to initially sorbed P. A decreased K parameter and increased Kd value, particularly at the highest pH value and highest P-addition level, endorsed this phenomenon. Liming the soil had the double effect of reducing P sorption (up to 4.5 kg ha-1 of remaining P in solution) and enhancing P desorption (up to 2.7 kg ha-1 of additionally released P into solution).
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000500004
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832005000500004
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.29 n.5 2005
Fonte: | info:eu-repo/semantics/openAccess