Source: University of Minnesota
With fall field work underway, the Minnesota Department of Agriculture (MDA), the Minnesota Crop Production Retailers and soil scientists from the University of Minnesota urge agribusinesses to follow the state's voluntary best-management practices (BMPs) related to autumn applications of nitrogen.
Historically, anhydrous ammonia has been the primary nitrogen source for fall application. However, recent price increases for anhydrous may now have producers and dealers thinking about alternative sources, particularly urea. Alternative nitrogen sources are generally more soluble, resulting in greater chances of nitrogen loss. In addition, long-term nitrate data show an upward trend in both surface waters and many groundwater aquifers. These factors make it especially important for farmers to review and follow the BMPs for fall nitrogen applications.