Question

What is Sulfur Granite ? ​

Answer 1

Answer:

Approximately 95 percent of the total sulfur in soils is found in organic matter. As soil organic matter breaks down, the S in the organic form mineralizes to sulfate-sulfur, the only form that plant roots can absorb. While we have an understanding of how sulfur reacts with crops, there still is a lot we don't know about the forms of sulfur in soil over the growing season.

A recent study funded by AFREC compared elemental and sulfate-sulfur, applied in the fall and the spring in poorly drained soils to test the need for sulfur in soils with high organic matter. With this study, we found that there are instances when sulfur should be applied to soils with high organic matter, but that the amount of sulfur required is small.

Current sulfur guidelines for Minnesota suggest the potential for sulfur response is greatest when soil organic matter concentration in the top six inches is less than four percent. However, we have noticed fields with sulfur deficiencies in Western Minnesota that do fit this relationship and required further research.

The amount of plant available sulfur can be relatively low early in the growing season. Current hybrids with increased vigor can show striping that looks like sulfur deficiency early in the season. We've consistently seen symptoms typical of sulfur deficiency in Western Minnesota in a number of trials. If striping goes away by the V5 growth state corn yield has seldom been impacted.

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Answer 2

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Approximately 95 percent of the total sulfur in soils is found in organic matter. As soil organic matter breaks down, the S in the organic form mineralizes to sulfate-sulfur, the only form that plant roots can absorb. While we have an understanding of how sulfur reacts with crops, there still is a lot we don't know about the forms of sulfur in soil over the growing season.