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Sulphur fractionation in calcareous soils and bioavailability to plants
Hu, Z.Y ; Zhao, F.J ; McGrath, S.P
Plant and soil, 2005, Vol.268 (1-2), p.103-109
[Periódico revisado por pares]
Dordrecht: Kluwer Academic Publishers
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Título:
Sulphur fractionation in calcareous soils and bioavailability to plants
Autor:
Hu, Z.Y
;
Zhao, F.J
;
McGrath, S.P
Assuntos:
Acid soils
;
Agricultural soils
;
Agrology
;
Agronomy. Soil science and plant productions
;
Bioavailability
;
Biological and medical sciences
;
Calcareous soils
;
Chemical, physicochemical, biochemical and biological properties
;
Fundamental and applied biological sciences. Psychology
;
Grassland soils
;
Mineral components. Ionic and exchange properties
;
nutrient availability
;
Organic soils
;
Physics, chemistry, biochemistry and biology of agricultural and forest soils
;
Plants
;
Soil biochemistry
;
soil fertility
;
soil nutrients
;
Soil science
;
Soils
;
sulfates
;
Sulfur
É parte de:
Plant and soil, 2005, Vol.268 (1-2), p.103-109
Notas:
http://www.kluweronline.com/issn/0032-079X/contents
Descrição:
Sulphur fractionation and availability to plants are poorly understood in calcareous soils. Sixty-four calcareous soils containing varying amounts of CaCO3 were collected from ten provinces in China and their S fractions determined. Organic S was the predominant fraction of S, accounting for on average 77% of the soil total S. The amounts of adsorbed sulphate were found to be negligible. 1 M HCl extracted substantially more sulphate than either 0.01 M CaCl2 or 0.016 M KH2PO4, indicating the existence of water-insoluble but acid-soluble sulphate, probably in the form of sulphate co-precipitated with CaCO3. The concentrations of water-insoluble sulphate correlated positively with the contents of CaCO3 and accounted for 0.03–40.3% (mean 11.7%) of soil total S. To test the bioavailability of water-insoluble sulphate, a sulphate-CaCO3 co-precipitate labelled with 35S was prepared and added to a calcareous soil in a pot experiment with either $\mathrm{N}{\mathrm{H}}_{4}^{+}$ or $\mathrm{N}{\mathrm{O}}_{3}^{-}$ as the N source. In 29 days, wheat plants took up 10.6% and 3.0% of the 35S added to the soil in the $\mathrm{N}{\mathrm{H}}_{4}^{+}$ and $\mathrm{N}{\mathrm{O}}_{3}^{-}$ treatments, respectively. At the end of the pot experiment, the decrease of water-insoluble, acid-soluble, sulphate was more apparent in the $\mathrm{N}{\mathrm{H}}_{4}^{+}$ than in the $\mathrm{N}{\mathrm{O}}_{3}^{-}$ treatment. The results indicate that sulphate co-precipitated with CaCO3 in calcareous soils may become partly available for plant uptake, depending on rhizosphere pH, if the field precipitate is similar to the laboratory prepared sample studied.
Editor:
Dordrecht: Kluwer Academic Publishers
Idioma:
Inglês
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