Soil management effects on phosphorus sorption and external P requirement in oxisols of Malawi
| Autor: | Venon H. Kabambe, James H. A. Maida, Max William Lowole, Mnthambala F |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Conventional tillage
Chemistry Phosphorus chemistry.chemical_element Sorption 04 agricultural and veterinary sciences 010501 environmental sciences Crop rotation 01 natural sciences Soil management Tillage Agronomy Oxisol Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries 0105 earth and related environmental sciences |
| Zdroj: | Journal of Soil Science and Environmental Management. 7:106-114 |
| ISSN: | 2141-2391 |
| DOI: | 10.5897/jssem2015.0483 |
| Popis: | Oxisols are one of the major soils of Malawi and they are high in P sorption. Conservation agriculture has been practiced on this soil for some years now but soil management effects on P sorption and external P requirement (EPR) of Oxisols in Malawi have not, however, been determined. Soil management effects on P sorption and EPR of Oxisols in Malawi were therefore determined in the present study. The effects studied were conventional tillage (CT), no-tillage (NT) and crop rotation (CR). The soils differed considerably in their sorption characteristics, with the sorption maxima ranging from 413 to 345 mg P kg-1. Differences in sorption maxima and affinity due to soil management effects were statistically significantly (P ≤ 0.05). The sorption affinity (b) values ranged from 0.48 to 0.72 dm3 mg-1 and differences due to soil management effects were statistically significant (P ≤ 0.05) only between conventional tillage (CT) and no tillage (NT) or crop rotation (CR). The sorption affinity due to NT was not statistically significant from that of CR. The b values were the highest in soils that had been subjected to CT. Key words: Oxisols, soil management effects, sorption affinity, sorption maxima, external P requirement. |
| Databáze: | OpenAIRE |
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