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Forms and retention of phosphorus in an illite-clay soil profile with a history of fertilisation with pig manure and mineral fertilisers
- Source :
-
Geoderma . Jan2007, Vol. 137 Issue 3/4, p455-465. 11p. - Publication Year :
- 2007
-
Abstract
- Abstract: Phosphorus (P) binding to minerals and ion exchange capacity in different clay fractions were examined for a non-calcareous soil in southwest Sweden. The soil had received pig slurry during three decades, 2 kg lower than the recent maximum load of 22 kg P ha−1 year−1 as regulated by livestock density legislation. The topsoil was found to contain 33% clay by weight. Illite was the predominant clay mineral and constituted 13% of total soil. Vermiculite (10%), K-feldspar (14%) and plagioclase (21%) also constituted significant proportions of the mineralogical matrix. Within the most fine-grained clay fraction, 50% of which was less than 0.1 μm in particle size, illite and vermiculite dominated totally, 50 and 23% respectively. In fine-grained (FG), most fine-grained (MFG) and colloidal fractions, there were strong relationships (Pearson correlation coefficient 0.98–1.00) between calcium (Ca) and P. There was a low molar ratio Ca:P in added manure and the presence of Ca–P complexes in the fine soil fractions was indicated. In contrast, in the coarse soil fraction (>2 μm), there was a clear relationship (Pearson coefficient 0.97) between P and iron oxide (Fe2O3) and between P and aluminium oxide (Al2O3) throughout the soil profile. Thus even for non-calcareous soils, formation of Ca–P complexes should be taken into account with regards to losses of colloidal P to drainage water. [Copyright &y& Elsevier]
- Subjects :
- *ANIMAL waste
*SOIL fertility
*SOIL amendments
*PLANT nutrition
Subjects
Details
- Language :
- English
- ISSN :
- 00167061
- Volume :
- 137
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Geoderma
- Publication Type :
- Academic Journal
- Accession number :
- 23604693
- Full Text :
- https://doi.org/10.1016/j.geoderma.2006.10.003