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首页> 外文学位 >Nitrogen management in wheat (Triticum aestivum L.): Grain yield and quality as influenced by topography and fertilization.
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Nitrogen management in wheat (Triticum aestivum L.): Grain yield and quality as influenced by topography and fertilization.

机译：小麦（Triticum aestivum L.）的氮素管理：地形和施肥对谷物产量和品质的影响。

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摘要

Excessive N fertilization of soft red winter wheat ( Triticum aestivum L.) may lead to undesirable protein concentrations. The inter-relationships between wheat grain yield, grain protein concentration, soil nitrogen (N) levels and N fertilization on two variable landscapes (site 1 and 2) in Southwestern Ontario were examined. Six N rates (0 to 145 kg N/ha) were applied to plots (400 m long), arranged in a randomized complete split block design with four replicates. Along each plot, samples for soil N test and grain yield were collected on a 20-m interval resulting in a 3 x 20 m grid-sampling pattern (456 sampling points/site). Upper slope positions typically had lower yields and higher protein concentrations than the lower slope positions. For each field the most economic rate of N (MERN) for yield calculated from quadratic regression models was determined to be 103.1 and 105.2 kg N/ha at sites 1 and 2, respectively. The MERN varied with slope position at site 2 suggesting the potential to variably apply N. Protein concentrations followed a sigmoidal response to applied N. Although the response was similar for each slope position, there was a greater risk of exceeding the desirable protein concentration at the upper slope positions.
机译：过量施肥的软红冬小麦（Triticum aestivum L.）可能会导致蛋白质浓度过高。研究了安大略省西南部两个变量景观（站点1和2）的小麦籽粒产量，籽粒蛋白质浓度，土壤氮（N）水平和氮肥之间的相互关系。将六种氮肥（0至145 kg N / ha）应用于地块（400 m长），以随机完整的分块设计布置，重复四次。在每个样区中，以20 m的间隔收集土壤N试验和谷物产量的样品，从而形成3 x 20 m的网格采样模式（456个采样点/站点）。与较低斜率位置相比，较高斜率位置通常具有较低的产量和较高的蛋白质浓度。对于每个田地，根据二次回归模型计算出的最经济的氮产量（MERN），在地点1和地点2分别确定为103.1和105.2 kg N / ha。 MERN随位点2上的斜率位置变化而变化，这表明可能会施加氮。蛋白质浓度对施加的氮呈S形响应。尽管每个斜率位置的响应相似，但存在更大的风险，可能会超出目标值。上坡位置。

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  • 作者

    Denys, Christopher John.;

  • 作者单位

    University of Guelph (Canada).;

  • 授予单位 University of Guelph (Canada).;
  • 学科 Agriculture Agronomy.; Biology Plant Physiology.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 91 p.
  • 总页数 91
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;植物学;
  • 关键词

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