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This article in AJ

  1. Vol. 100 No. 6, p. 1527-1534
     
    Received: Jan 3, 2008


    * Corresponding author(s): cauzfs@cau.edu.cn
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doi:10.2134/agronj2008.0005

On-Farm Evaluation of Winter Wheat Yield Response to Residual Soil Nitrate-N in North China Plain

  1. Zhenling Cuia,
  2. Xinping Chena,
  3. Yuxin Miaoa,
  4. Fei Lia,
  5. Fusuo Zhang *a,
  6. Junliang Lib,
  7. Youliang Yec,
  8. Zhiping Yangd,
  9. Qiang Zhangd and
  10. Chunsheng Liue
  1. a Dep. of Plant Nutrition, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China
    b Dep. of Agronomy, Qingdao Agricultural University, Qingdao 266023, China
    c College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou 450000, China
    d Institute of Soil Science and Fertilizer, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
    e College of Resources and Environmental Sciences, Shandong Agricultural University, Taian 271018, China

Abstract

High soil nitrate-N accumulation has been observed in North China Plain (NCP), but it was seldom considered as a N source in N management due to the lack of data on crop response to soil nitrate-N accumulation. A total of 124 on-farm N-response experiments were conducted from 2003 to 2006 in seven key winter wheat (Triticum aestivum L.) production regions of NCP to evaluate wheat yield response to residual soil nitrate-N. High soil nitrate-N accumulation ( ≥172 kg N ha−1 in 90 cm soil depth) was observed during wheat growing season. Compared with 165 nitrate-N ha−1 in 0 to 90 soil layer before sowing, added fertilizer N did not increase wheat yield under 262 kg nitrate-N ha−1 condition, but increased residual nitrate-N and N losses and reduced recovery N efficiency (P < 0.05). Wheat yield response to residual soil nitrate-N could be fitted by a linear plus plateau model, and calculated minimum soil nitrate-N content for maximum grain yield was 211 kg N ha−1 (R 2 = 0.31) before sowing across all 223 zero-N plots in 124 sites. When two growth periods (before and after shooting stage) were analyzed separately, the coefficient of determination between yield and soil nitrate-N increased significantly. We conclude that winter wheat yield response to added N fertilizer was unlikely if soil nitrate-N content exceeded 72 (0–30 cm soil depth) and 175 kg N ha−1 (0–90 cm soil depth) before sowing and shooting stage, respectively. According to these thresholds, 55% and 37% of farmer's fields did not need to apply N fertilizer before sowing and at shooting stage, respectively.

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Copyright © 2008. American Society of AgronomyCopyright © 2008 by the American Society of Agronomy