Biological and Chemical Evaluation of the Readily Available Sulfur Status of Mississippi Soils1
- J. O. Sanford and
- J. D. Lancaster2
A quick-cropping technique was adapted to study the immediately available S in soils. Forty Mississippi soils were cropped using this technique. Sulfur uptake by the crop was compared with the sulfate-S content of the soils. Correlation of the two variables proved highly significant (r = 0.87). Reduction in soluble sulfate content of soils during the short cropping period agreed rather closely with S absorbed by the crop.
A study of the distribution and availability of sulfate in the profile of soils of the Hill area of Mississippi showed that, in general, sulfate-S in the subsoil of a particular profile tended to exceed that in the corresponding surface soil. Sulfate-S in subsoils was almost as available as that in surface soils under the conditions of the experiment. Ratios of S uptake by plants to sulfate-S in soils were 1:1.5 for surface soils and 1:1.7 for subsoils.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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