Diffusive fluxes of phosphorus, potassium and metallic microelements as affected by soil compaction. Issue 19 (28th October 2018)

• Record Type: Journal Article
• Authors: Silva, Sérgio Ricardo; Barros, Nairam Félix de; Silva, Ivo Ribeiro da; Comerford, Nicholas Brain
• Is Part Of: Communications in soil science and plant analysis. Volume 49:Issue 19(2018)
• Page Start: 2369
• Page End: 2378
• Publication Date: 2018-10-28
• Subjects: Ion-exchange membrane -- nutrient diffusion -- nutrient transport -- soil bulk density -- soil solution; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2018.1510947
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: The objective was to evaluate the effects of soil compaction on phosphorus (P), potassium (K), zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) diffusive fluxes. The experiment consisted of two Oxisols and eight compaction pressures. The soil samples were placed in diffusion chambers, simultaneously with two ion-exchange membranes (anionic and cationic), compressed and incubated for 20 days. The P, K, Zn, Cu, Fe, and Mn diffusive fluxes (PDF, KDF, ZnDF, CuDF, FeDF, and MnDF) were determined. The compaction decreased the PDF in the oxidic-gibbsitic soil, and increased KDF, ZnDF, CuDF, and MnDF, in both soils. There was a higher diffusion of Zn, Cu, and Mn in the kaolinitic than the oxidic-gibbsitic soil. The descending order of cationic-microelement diffusive flux was MnDF > ZnDF ⋙ FeDF > CuDF. Presumably, Fe was mainly diffused as organic complexes with net negative charges, whereas Zn and Mn as free ions and, or, inorganic and organic complexes with positive charges. Abbreviations : CuDF, cupper diffusive flux; FeDF, iron diffusive flux; KDF, potassium diffusive flux; MnDF, manganese diffusive flux; PDF, phosphorus diffusive flux; ZnDF, zinc diffusive flux; AEM, anion-exchange membrane; CEM, cation-exchange membrane