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This article in CM

  1. Vol. 3 No. 1
     
    Accepted: Oct 20, 2004


    * Corresponding author(s): binfordg@udel.edu
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doi:10.1094/CM-2004-1124-01-RS

Foliar Fertilization of Roundup Ready Soybeans

  1. Gregory D. Binford *a,
  2. Brian K. Hearn,
  3. Mark A. Isaacs,
  4. David J. Hansen and
  5. Richard W. Taylorc
  1. a Department of Plant and Soil Sciences, University of Delaware, Townsend Hall, Newark 19716;
    c Department of Plant and Soil Sciences, University of Delaware, Townsend Hall, Newark 19716

Abstract

Roundup Ready (RR) soybeans (Glycine max) have become the dominant type of soybean grown throughout most soybean growing areas. This RR soybean technology allows the opportunity to add foliar fertilizers to glyphosate. This opportunity is attractive to growers because it eliminates the cost of application associated with foliar fertilization. Nonetheless, if this application of fertilizer results in no yield increases, the purchase of the fertilizer would decrease overall profitability. We evaluated soybean yield response to several foliar fertilizers on Coastal Plain soils over eight site-years. Norcop, Nutrition Plus, Ele-Max (Mn), and 8-0-0-9 were applied with glyphosate on RR soybean. Nitrogen containing products (CoRon) were also evaluated for potential yield responses when applied during early reproductive growth. With the exception of the 8-0-0-9, our results showed no injury to soybean foliage when these products were used at recommended rates. The 8-0-0-9 caused serious foliar injury when applied at a rate of N at 25 lb/acre. The effectiveness of glyphosate herbicide was not affected by the foliar fertilizers. Overall, our results indicated that there was no yield increase from adding these foliar fertilizers to glyphosate, and there was no yield increase from the application of N fertilizers during early reproductive growth.

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