Elaboration of a nitrogen nutrition indicator for winter wheat based on leaf area index and chlorophyll content for making nitrogen recommendations
Elaboration of a nitrogen nutrition indicator for winter wheat based on leaf area index and chlorophyll content for making nitrogen recommendations
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DOI：
10.1016/j.eja.2006.10.001
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发表时间：
2007-07-01
影响因子：
5.2
通讯作者：
Mary, Bruno
中科院分区：
文献类型：
--
作者：
Houles, Vianney;Guerif, Martine;Mary, Bruno
太阳领域的遥感在田间尺度上提供绿叶面积指数和叶绿素含量的间接测量。该信息可用于构建一个与作物自身氮素状况相关的指标，用于提出氮肥推荐量，且在田间尺度上有所变化。我们提出以参照最佳氮素状况确定的氮吸收亏缺作为冬小麦作物的一个指标。提出并比较了从绿叶面积指数（GLAI）和叶绿素含量（Cab）计算作物氮吸收亏缺的三种方法。第一种方法是根据叶绿素含量评估氮营养指数。第二种方法评估冠层的氮含量，第三种方法则根据冠层所含叶绿素的量直接估算冠层吸收的氮量。这些方法在两年内两个地点获得的三个数据集上进行了校准和验证，实验中的氮肥施用量从0到300千克/公顷不等。测量包括从冬末到抽穗期干物质（范围为5.9 - 17.5吨/公顷）、绿叶面积指数（范围为0.1 - 6）、叶绿素含量（范围为0.3 - 0.9克/平方米叶或0.1 - 4.5克/平方米土壤）和氮吸收（范围为38 - 234千克/公顷）的时间演变。我们发现，当考虑冠层中叶绿素的总量（克/平方米土壤）时，吸收的氮与叶绿素之间的关系比考虑叶绿素含量（克/平方厘米叶）时更稳定。因此，第三种方法在描述和预测方面都取得了最佳效果，误差约为20千克氮/公顷。（C）2006爱思唯尔有限公司。保留所有权利。
Remote sensing in the solar domain provides indirect measurements of green leaf area index and chlorophyll content on a within-field scale. This information can be used to build an indicator related to the nitrogen status of the crop itself used to make nitrogen recommendations, varying on the within-field scale. We propose as an indicator for winter wheat crops the nitrogen absorption deficit determined by reference to optimal nitrogen status. Three methods for calculating the nitrogen absorption deficit of the crop from the green leaf area index (GLAI) and the chlorophyll content (Cab) are proposed and compared. The first method consists in evaluating the nitrogen nutrition index from the chlorophyll content. The second evaluates the nitrogen content of the canopy and the third directly estimates the quantity of nitrogen absorbed by the canopy from the quantity of chlorophyll that the canopy contains. The methods were calibrated and validated on three datasets obtained on 2 years and two sites, on experiments were nitrogen dressing varied from 0 to 300 kg ha(-1). Measurements consisted in time evolution from end of winter to earing stage of dry matter (range 5.9-17.5 t ha(-1)), GLAI (range 0.1-6), chlorophyll content (range 0.3-0.9 g m(-2) leaf or 0.1-4.5 g m(-2) soil) and nitrogen absorption (range 38-234 kg ha(-1)). We. found that the relationship between absorbed nitrogen and chlorophyll was more stable when considering integrated quantities of chlorophyll in the canopy (g m(-2) soil) than when considering chlorophyll content (g cm(-2) leaf). As a consequence, the third method gave the best results, both for description and prediction, with an error of about 20 kg N ha(-1). (C) 2006 Elsevier B.V. All rights reserved.