Phosphorus adsorption and desorption in undisturbed samples from subtropical soils under conventional tillage or no‐tillage
| Autor: | Jessé Rodrigo Fink, Jovana Bavaresco, Cimélio Bayer, Alberto Vasconcellos Inda, José Torrent, Vidal Barrón |
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| Rok vydání: | 2016 |
| Předmět: |
Conventional tillage
Soil test Chemistry Soil Science Soil science 04 agricultural and veterinary sciences Plant Science Ultisol 010501 environmental sciences complex mixtures 01 natural sciences Soil management Adsorption Oxisol Desorption Environmental chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries 0105 earth and related environmental sciences |
| Zdroj: | Journal of Plant Nutrition and Soil Science. 179:198-205 |
| ISSN: | 1522-2624 1436-8730 |
| Popis: | The dynamics of P in soil is greatly influenced by the adsorption of phosphate onto Fe-oxides. Access of phosphate to the surface of these minerals depends on the degree of soil aggregation, which in turn is influenced by soil management system. The primary purpose of this work was to investigate P adsorption and desorption in undisturbed and disturbed soil samples from an Ultisol (Rhodic Paleudult) and an Oxisol (Humic Hapludox) under conventional tillage (CT) or no-tillage (NT). Phosphorus adsorption and desorption in undisturbed soil was studied by using a continuous flux system containing a P solution for adsorption measurements or deionized water and Mehlich-I solution for desorption measurements. The Oxisol, which had higher clay, hematite, and goethite contents than the Ultisol, exhibited the highest maximum P adsorption capacity (Pmax) values in disturbed samples. Also, the disturbed Ultisol samples had lower Pmax values under NT than under CT. The undisturbed soil samples exhibited no significant differences in P adsorption between soil management systems, but P desorption was more marked under NT than under CT. The samples of Oxisol under NT exhibited lower P adsorption rates and higher P desorption rates than the CT samples of the same soil. The decreased P adsorption in undisturbed samples relative to disturbed samples suggests that P adsorption is influenced by physical properties of soil. |
| Databáze: | OpenAIRE |
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