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Continued from page 2 Soil sulfur tests often do not predict crop response to sulfur fertilizer very well, according to Jones. Therefore, producers should consider other factors to determine if sulfur fertilization is necessary. Sulfur deficiency is more likely in coarse, shallow soils and in soils with low organic matter. “If past yields or protein levels have been unexpectedly low and don’t respond to additional nitrogen fertilizer, sulfur may be deficient,” Jones said. Strip trials with gypsum or ammonium sulfate can determine if winter wheat is responsive to sulfur in a given field.

More resources available

MSU Extension has several resources for making fertilizer decisions available at store., including Montana Wheat Production Guide, Fertilizer Guidelines for Montana Crops, Interpretation of Soil Test Reports for Agriculture and Developing Fertilizer Recommendations for Agriculture.

The MSU Fertilizer Recommendation tool (sarc.montana. edu/php/soiltest) and the Economic Nitrogen Calculator ( nitrogen/index.html) are online tools to help calculate fertilizer requirements. Questions about this or other soil fertility topics may be directed to Jones at [email protected] or 406-994-6076 or may be addressed by visiting the MSU Extension soil fertility website at landresources.montana. edu/soilfertility.

For questions on identifying physiological leaf spots and crop diseases, contact McKelvy at [email protected] edu or call 406-994-5572. Information on sample submission to the Schutter Diagnostic Lab can be found on the lab’s website at diagnostics.montana. edu/contact.html.

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