University of Maryland Extension

Webinar: Is There a Best Way to Fertilize Corn with Nitrogen? (1 CEU)

Tuesday, Dec. 4, 2018 - 12:00pm to 1:00pm
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Dr. Fred Below and Brad Bernhard

An American Society of Agronomy webinar sponsored by Verdesian Life Sciences.

Assuring adequate nitrogen (N) availability during key stages of plant growth is a major factor affecting yield and profitability of corn. Nitrogen uptake by modern corn hybrids follows a sigmoidal pattern over time with limited uptake before the V8 growth stage. Between V8 and flowering, two thirds of total plant N uptake occurs, equal to a rate of 7 lbs. of N per acre per day for a period of at least 21 continuous days. Side-dressing N to coincide with this period of maximum uptake is a logical approach to assure adequate N availability, while limiting its potential for loss. A relatively new technology known as the Y-drop allows for placement of side-dressed N directly next to the crop row, where proximity to roots and stem flow of water helps to assure availability by creating a zone of high N concentration directly in the plant’s rooting zone. Alternatively, technologies that inhibit nitrification of ammonium-N, prevent the volatilization of urea, or time the release of urea with water (such as polymer coated urea), along with banding of the N fertilizer, are other ways to assure adequate N availability at the right time and in the right place. In this webinar, we will present findings from our recent research examining the impacts of different combinations of N fertilizer sources, different timings of N application, use of loss mitigating technologies, and varying N placement techniques on corn N use and productivity. 

MDA is offering 1 CEU for Nutrient Management with proof of attendance.

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