While talking to agronomists from all over the Great Lakes Region, we have heard questions focused on nitrogen loss, population counts, and how late various corn maturities can be planted, but might we be missing the key questions to maximizing profitability of the 2017 corn crop. It is time to take a hard look at our nitrogen plans and adjust them for reality.
The target corn yield of 200+ bu/acre of April may not be a realistic yield goal with the delayed planting. One positive thing about reduced yield goals because of late planting, replanting, or reduced stand populations is that the nitrogen required to achieve this adjusted lower yield goal is likely also reduced. Early spring preplant and starter nitrogen has likely been subject to loss due to the wet conditions, but has the loss of nitrogen exceeded the loss of yield potential? Most likely no, and if you have plans to side-dress, be certain to adjust your nitrogen rates for you new yield goals.
With pre-plant nitrogen, utilize soil nitrate and ammonium tests to monitor fields that might be at risk. One benefit to late planted corn is that side dress nitrogen applications will also be delayed, usually into a period with weather conditions that have a lower risk of nitrogen loss, thus leading to potentially greater nitrogen use efficiency. Help from your Regional A&L Great Lakes Agronomist is only a phone call away!