Abstract
A wide range of extractants have been used to extract S from soils but correlations with plant response have generally been poor. Direct evidence that ester sulfates contribute to plant S supply lead to the development of the 0.25 M KCl extract heated at 40°C for 3 hours. Sequential extraction showed that this extractant removed 5.9% of ester sulfates from unfertilised soil. Support of the efficacy of the extract was obtained using specific radioactivity data from plants and soil extract.
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Blair, G.J., Lefroy, R.D.B., Chinoim, N. et al. Sulfur soil testing. Plant Soil 155, 383–386 (1993). https://doi.org/10.1007/BF00025063
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DOI: https://doi.org/10.1007/BF00025063