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Showing posts from July, 2014

Late season applications of nitrogen in spring wheat

Jochum Wiersma and Albert Sims, University of Minnesota
Interest in improving grain protein in hard red spring wheat (HRSW) with in-season applications of nitrogen (N) fertilizer may increase this year, since protein premiums and discounts are expected to be greater this year than last. Despite the late planting, the cool and wet weather has created a scenario where the crop may be a bit short on N to maximize grain protein.

There is an intuitive appeal to split apply N (N applied preplant and more N applied during the growing season) in HRSW since the crop takes up the majority of its N between jointing and flag leaf emergence. The practice of splitting the total N fertilizer gift in three or even four separate applications is commonplace in winter cereal production in the maritime regions of Europe, including the countries of Denmark, the Netherlands, the United Kingdom, and France. The objective of split N applications is to supply N when the crop needs it, improve N use efficien…