Título:	Derivation of differential buffer powers of the soil for cations.
Autor:	WIETHOLTER, S. COREY, R. B.
Afiliación:	SIRIO WIETHOLTER, CNPT.
Año:	1995
Referencia:	Revista Brasileira de Ciência do Solo, Campinas, v. 19, n. 1, p. 37-41, jan./abr. 1995.
Descripción:	Soil potassium (K) availability to plants is mainly a function of diffusion parameters, involving liquid and solid phases of the soil. General adoption of diffusion factors to determine K availibility is dependent on a method that allows rapid analysis of these parameters, especially the buffer power. The objective of this paper is to derive mathematically buffer powers of the soil for K, Na, Ca, Mg, Mn, and AI. Gapon's exchange equation was assumed to describe the reactions of cations between solid and solution phases of the soil. Equilibration of the soil with strontium to determine Lhe concentrations of the cations in the liquid phase is implied in the derivatious. The soil was considered a closed system, with a constant cation exchange capacity. Monovalent and divalent cation activities in the soil solution were expressed as monovalent K activity equivalence and divalent Ca activity equivalence, respectively. Each buffer power equation developed includes all major soil cations. It is expected that these expressions may be useful in diffusion-controlled nutrient plant uptake models as well as in determining plant availability of soil cations. Buffer power equations of Ca and Mg might also be useful in modeling lime dissolution rates in the soil.
Thesagro:	Química do Solo
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CNPT)