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This article in AJ

  1. Vol. 87 No. 5, p. 884-887
     
    Received: Oct 14, 1994
    Published: Sept, 1995


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doi:10.2134/agronj1995.00021962008700050017x

Implications of Nitrogen Management Strategies for Nitrate Leaching Potential: Roles of Nitrogen Source and Fertilizer Recommendation System

  1. Robert P. Durieux ,
  2. Hugh J. Brown,
  3. E. J. Stewart,
  4. J. Q. Zhao,
  5. William E. Jokela and
  6. Frederick R. Magdoff
  1. P lant and Soil Science Dep., Univ. of Vermont, Burlington, VT 05405
    D ep. of Natural Resources, Ball State Univ., Univ., Muncie, IN 47306.

Abstract

Abstract

Using the soil-based pre-sidedress nitrate test (PSNT) rather than the yield-goal-based cropping and manure history (CMH) to recommend N for corn (Zea mays L.) frequently results in less N applied. Our objectives were (i) to determine if this reduction in application snbstantially reduces the potential for N leaching and (ii) to compare dairy manure and commercial fertilizer as N sources, both within PSNT-based systems. The 4-yr field study included (i) a control (no manure or N fertilizer), and three N fertilizer rates based on (ii) PSNT, no manure added (PSNT−M); (iii) cropping and manure history (CMH), no manure added; and (iv) dairy manure application with additional sidedress N if recommended by the PSNT (PSNT+M). The PSNT−M treatment received 112 kg N ha−1 in 1990 and 123 kg N ha−1 in subsequent years, while the CMH treatment received 168 kg N ha−1 in all 4 yr. Corn yield, N uptake (defined as net aboveground N accumulation), spring and fall soil NO-3 levels, and overwinter NO3-N losses were measured. Silage yields of PSNT+M generally were greatest (average of 16.5 Mg ha−1), followed by PSNT−M and CMH treatments, which were similar (14.8 Mg ha−1). The CMH system resulted in the highest soil NO3-N levels (to 120 cm) at harvest and greatest overwinter net profile NO3-N loss (average 66 kg ha−1). The results indicate (i) a reduced residual N after harvest and therefore reduced potential for N leaching when using the PSNT for N recommendations and (ii) similar or higher yields using manure compared with commercial fertilizer.

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