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Agronomy Journal Abstract -

Growth, Yield, and Quality of Forage Maize Under Different Nitrogen Management Practices

 

This article in AJ

  1. Vol. 85 No. 2, p. 341-347
     
    Received: June 5, 1992


    * Corresponding author(s):
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doi:10.2134/agronj1993.00021962008500020033x
  1. W. J. Cox ,
  2. S. Kalonge,
  3. D. J. R. Cherney and
  4. W. S. Reid
  1. D ep. of Animal Sci., Cornell Univ., Ithaca, NY, 14853
    D ep. of Soil, Crop and Atmospheric Sciences, Cornell Univ., Ithaca, NY, 14853

Abstract

Abstract

Maize (Zea mays L.) forage producers need more information how N management affects dry matter (DM) yield, forage quality, and residual soil NO3 -N concentrations. Studies were conducted in New York to evaluate three hybrids under different sidedress N rates (0, 56, 140, and 255 kg N ha−1 at the V4 stage) and timing (70 + 70 kg N ha−1 at V4 and V8 and 75 + 75 + 75 kg N ha−1 at V4, V8, and R1 stages). The DM yields, which averaged 25% lower in 1991 (12.3 Mg ha−1) compared to 1990 (16.9 Mg ha−1), responded curvilinearly N rates with maximum economic yields of 140 and 160 kg N ha−1, respectively. Whole-plant neutral detergent fiber (NDF), acid detergent fiber (ADF), and N concentrations responded linearly to N rates in 1990 indicating that forage quality improved with each additional increment of N. Higher N rates, however, increased residual soil NO3-N concentrations in the upper 0.3 m soil depth in 1990 (0, 3, 30, and 32 mg kg−1) and 1991 (0, 0, 17, and 17 mg kg−1 for the 0, 56, 140, and 225 kg N treatments, respectively). Split-N applications compared to respective single rate N applications did not increase DM yields, improve forage quality, or decrease residual soil NO3-N concentrations. When applying higher rates of N fertilizer, maize forage producers must balance potential benefits of higher DM yields and improved forage quality with the potential risk of increased residual soil NO3-N concentrations.

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