Advancing Continuous Corn with Mid-Season Application of Nitrogen and Sulfur

summary

This project involved field experiments on Normania loam soil at the University of Minnesota Southwest Research and Outreach Center near Lamberton, MN and on Nicollet clay loam soil at the University of Minnesota Southern Research and Outreach Center near Waseca, MN during the 2022 growing season. The previous crop at both locations was corn, which had been stalk chopped and disk-ripped in the fall.

To accomplish the goal/objective “collect 0- to 6-inch soil samples and analyze for organic matter, pH, phosphorus, and potassium”, soil samples were collected from the 0- to 6-inch depth in April 2022 prior to preplant fertilization. One composite soil sample based on 10 cores was collected from each of the four replications at each location. The soil samples were dried in a forced-air oven at 95°F, crushed, sieved, and analyzed by the University of Minnesota Research Analytica Laboratory for organic matter (loss on ignition), pH (water), Bray-phosphorus 1, exchangeable K, and sulfate-sulfur.