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首页> 外文期刊>Soil Science Society of America Journal >In-Season Optical Sensing Improves Nitrogen-Use Efficiency for Winter Wheat
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In-Season Optical Sensing Improves Nitrogen-Use Efficiency for Winter Wheat

机译：季节内光学传感可提高冬小麦的氮利用效率

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Optical sensor-based N management strategies are promising approaches to improve N-use efficiency (NUE) and reduce environmental pollution risk. The objective of this study was to evaluate an active optical sensor-based in-season N management strategy for winter wheat (Triticum aestivum L.) in the North China Plain (NCP). Initially, 10 field experiments were conducted at four villages in NCP in the 2004/05, 2005/06, and 2006/07 growing seasons to evaluate the in-season N requirement prediction developed by Oklahoma State University. Then the N application rates, winter wheat grain yield, NUE, economic returns, residual N content after harvest and apparent N loss were compared among three different management systems on a total of 16 farmer fields in 2005/2006 and 14 farmer fields in 2006/2007. The systems included a sensor-based system, a soil test-based approach crediting soil residual mineral N (Nmin) to different depth at different growth stages, and common farmer practices. Averaged across site-years, the sensor-based, soil Nmin-based N management strategies, and farmer practices produced similar grain yields but used 67, 88, and 372 kg N ha-1, respectively. Nitrogen-use efficiencies were 61.3, 51.0, and 13.1% for the three methods of N recommendations, correspondingly. Their residual N content in the soil and apparent N loss were 115, 122, and 208 kg N ha-1, and 4, 15, and 205 kg N ha-1, respectively. The optical sensor-based N management strategy is relatively easy to use, has better potential to improve NUE and economic returns, and reduces residual soil N content and apparent N loss than other methods currently used in the NCP.
机译：基于光学传感器的氮管理策略是提高氮利用效率（NUE）和降低环境污染风险的有前途的方法。这项研究的目的是评估基于主动光传感器的华北平原冬小麦（Triticum aestivum L.）的季节氮管理策略。最初，在2004 / 05、2005 / 06和2006/07生长季节，在NCP的四个村庄进行了10个田间试验，以评估俄克拉荷马州立大学制定的季节中的氮需求预测。然后比较了三种不同的管理系统在2005/2006年和2006/2006年的14个农民田间的三种施用管理制度下的氮肥施用量，冬小麦籽粒产量，NUE，经济收益，收获后残留的N含量和表观N损失。 2007年。该系统包括基于传感器的系统，基于土壤测试的方法，可将不同生长阶段的土壤残留矿质N（Nmin）记入不同深度，以及农民的常见做法。基于站点年的平均值，基于传感器，基于土壤Nmin的氮管理策略和农民的实践产生了相似的谷物单产，但分别使用了67、88和372 kg N ha-1。三种氮素推荐方法的氮素利用率分别为61.3％，51.0和13.1％。它们在土壤中的残留氮含量和表观氮损失分别为115、122和208 kg N ha-1，以及4、15和205 kg N ha-1。与NCP中目前使用的其他方法相比，基于光学传感器的N管理策略相对易于使用，具有改善NUE和经济回报的更大潜力，并减少了残留土壤N含量和表观N损失。

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