Identifying and responding to soybean inoculation failures
Applying 60 to 70 pounds of actual nitrogen per acre will correct the deficiency and provide an economic return up to 10 bushels per acre if applied timely. Ideally, the supplemental nitrogen should be applied between the R1 growth stage, or one open flower on 50 percent of the plants, and the R2 growth stage, or one open flower on one of the upper two nodes on the main stem on 50 percent of the plants. However, positive results have been reported from nitrogen applications made at R3, or one pod 3/16 of an inch long on one of the upper four nodes on the main stem on 50 percent of the plants.
Broadcast applications of Urea-Ammonium Nitrate (UAN) solutions such as 28 percent UAN will damage the foliage, so these materials should be applied to the soil. Urea can be broadcast without burning the foliage as long as the foliage is dry. Consider adding a urease inhibitor to urea and 28 percent UAN to reduce volatilization losses.
This article was produced by the SMaRT project (Soybean Management and Research Technology). The SMaRT project was developed to help Michigan producers increase soybean yields and farm profitability. Funding for the SMaRT project is provided by Michigan State University Extension and the Michigan Soybean Checkoff program
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