The rate of oxidation of elemental sulphur fertilizers
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Uncropped field experiments were begun in June, 1979, and continued from 12 to 15 weeks after the addition of sulphur fertilizer on three soils, to determine the rate of conversion of elemental sulphur to soluble sulphate. For very finely divided elemental sulphur, which was worked thoroughly into the soil at the start of the experiment, approximately one-half to two-thirds appeared as soluble sulphate. For commercial fertilizers formed as pellets or water degradable granules of elemental sulphur, which were worked thoroughly into the soil at the start of the experiment, there was little, or no, conversion to soluble sulphate. At the last soil sampling the pellets and degradable granules of elemental sulphur were: found to be intact in all three soils. These experiments indicate that for annual crops the pellets or granules are not suitable sulphur fertilizers when added at the time of seeding, or soon before. It must be emphasized, however, that the experiments were not designed to supply information on the effectiveness of the fertilizers when applied well before time of seeding, or in the previous fall. Likewise, the experiments were not designed to test any effect of tillage on rate of oxidation of these commercial elemental sulphur fertilizers.
Part OfSoils and Crops Workshop
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