Soil Solution as Affected by Plant Residues and Nitrogen Rates


Autoria(s): Rosolem, Ciro Antonio; da Silva, Rosemary Helena
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/01/2010

Resumo

Cation mobility in acidic soils with low organic-matter contents depends not only on sorption intensity but also on the solubility of the species present in soil solution. In general, the following leaching gradient is observed: potassium (K+) magnesium (Mg2+) calcium (Ca2+) aluminum (Al3+). To minimize nutrient losses and ameliorate the subsoil, soil solution must be changed, favoring higher mobility of M2+ (metal ions) forms. This would be theoretically possible if plant residues were kept on the soil surface. An experiment was conducted in pots containing a Distroferric Red Latosol, with soil solution extractors installed at two depths. Pearl millet, black oat, and oilseed radish residues were laid on the soil surface, and nitrogen (as ammonium nitrate) was applied at rates ranging from 0 to 150mgkg-1. Corn was grown for 52 days. Except for K+ and ammonium (NH4 +), nitrogen rates and plant residues had little effect upon the concentrations and forms of the elements in the soil solution. Presence of cover crop residues on soil surface decreased the effect of nitrogen fertilizer on Ca leaching. More than 90% of the Ca2+, Mg2+, and K+ were found as free ions. The Al3+ was almost totally complexed as Al(OH3)0. Nitrogen application increased the concentrations of almost all the ions in soil solution, including Al3+, although there was no modification in the leaching gradient.

Formato

13-28

Identificador

http://dx.doi.org/10.1080/00103620903360254

Communications In Soil Science and Plant Analysis. Philadelphia: Taylor & Francis Inc, v. 41, n. 1, p. 13-28, 2010.

0010-3624

http://hdl.handle.net/11449/5531

10.1080/00103620903360254

WOS:000274286300002

Idioma(s)

eng

Publicador

Taylor & Francis Inc

Relação

Communications in Soil Science and Plant Analysis

Direitos

closedAccess

Palavras-Chave #Ion speciation #leaching #liming #no-till
Tipo

info:eu-repo/semantics/article