By Blake Jackson
High fertilizer costs and heavy rainfall across Missouri are making nitrogen management in corn more difficult this season. Excess rain can saturate soils, leading to nitrogen loss and leaving crops deficient.
Rescue nitrogen is an additional application used when corn shows signs of nitrogen deficiency, such as yellowing. While these applications have traditionally been profitable due to yield increases, rising fertilizer prices now require stronger yield gains to justify the cost. As a result, decisions about applying rescue nitrogen are more dependent on individual field conditions.
Farmers are encouraged to evaluate the financial return before applying nitrogen. A simple breakeven calculation that includes nitrogen price, application cost, and corn price can help determine whether the investment will pay off. For example, higher nitrogen and application costs mean growers need a greater yield increase to break even.
Research shows that corn can respond well to rescue nitrogen, but results vary widely depending on conditions. Nitrogen loss is often uneven across fields, meaning some areas may benefit more than others. The highest returns typically come from the first amounts of applied nitrogen, especially in the most deficient zones.
Timing is also flexible, as corn can still respond to nitrogen applications later in the growing season.
Overall, farmers should carefully assess field variability, costs, and expected yield response to make informed decisions about rescue nitrogen applications.
For more information, contact a local MU Extension agronomist or review the Rescue Nitrogen Brief
Photo Credit: gettyimages-oticki
Categories: Missouri, Crops, Corn