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Evaluation of Sulfur Guidelines for Major Crops in MN

Start Date: 2016
Principal Investigator: Dan Kaiser
Organization: University of Minnesota, Department of Soil, Water, and Climate
Status: Ongoing

Background Info

This study will evaluate timing (fall versus spring), rate (0, 5, 10, and 20 lb. S per acre), and source (sulfate-S and elemental-S) applied for corn on poorly drained soils with high organic matter, evaluate the impact of S on protein content and composition of hard red spring wheat, and compare methods for analyzing S concentration in plant tissue and their ability to predict grain yield of corn, soybean, or spring wheat.

Objectives

Determine whether poorly drained soils in western Minnesota will respond to sulfur fertilizer

Evaluate the efficacy of fall and spring applied elemental S and SO4-S containing fertilizer sources on corn

Assess the impact of sulfur fertilizer on grain quality of hard red spring wheat

Develop NIR curves for hard red spring wheat to screen grain for common amino acids

Compare methods of detection of sulfur in plant tissue for prediction of crop yield response to sulfur fertilizer

Key Findings

Corn – there was no effect of sulfur source, timing, or rate on plant greenness at V10 or the concentration of S in the uppermost fully developed corn leaf at either of the 2016 locations. The only significant effects were for the timing by source interaction and timing by source by rate three way interactions at Renville. It is highly likely that there are significant different among the values listed in Table 4 but not key trends are present where a rate, source, or timing performed better than another.

Wheat – Funding from this study included work on developing NIR equations for selected amino acids and sugars for hard red spring wheat. This work is progressing but not completed yet.

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