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Ground versus aerial canopy reflectance of corn: Red-edge and non-red edge vegetation indices
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-03-20 , DOI: 10.1002/agj2.20657
Zachary Sumner 1 , Jac J. Varco 1 , Jagmandeep S. Dhillon 1 , Amelia A. A. Fox 1 , Joby Czarnecki 1 , W. Brien Henry 1
Affiliation  

Constant-rate blanket applications of fertilizer N can result in both an over and under supply relative to crop utilization on a field-by-field basis. Variable-rate (VR) applications tailored to better meet crop demand can improve N use efficiency on spatially variable soils. The objectives of this study were to compare the response in corn (Zea mays L.) canopy reflectance derived vegetation indices (VI) to varying fertilizer N rates and to determine relationships between resulting VIs acquired using two different sensing platforms. Four fertilizer N rates in 50/50 split at V1–2 and V6–7 leaf stages were applied, from deficient to excessive, to create varying corn nutritional N status. Sensing and biophysical sampling were performed throughout the season for analysis and comparison to calculated VIs. Grain yield plateaued around 135±10 kg N ha–1 across the study. Furthermore, strong relationships between VIs and fertilizer N rates were found, with the strongest using combined indices that incorporate the red-edge wavelength (720 nm). Relationships strengthened at later growth stages. The response models were found to be sensor specific, VI specific, and mostly non-transferable between sensors. Results from this study demonstrate the utility of using remote sensing technologies to predict corn N status more accurately for eventual use in VR prescription development.

中文翻译:

玉米的地面与空中冠层反射率:红边和非红边植被指数

与田间作物利用相比,氮肥的恒定速率全面施用可能导致供应过剩和供应不足。为更好地满足作物需求而定制的可变速率 (VR) 应用可以提高空间可变土壤上的氮利用效率。本研究的目的是比较玉米(Zea maysL.) 冠层反射率得出的植被指数 (VI) 与不同的肥料 N 比率,并确定使用两个不同传感平台获取的结果 VI 之间的关系。在 V1-2 和 V6-7 叶阶段按 50/50 比例施用四种氮肥,从缺乏到过量,以产生不同的玉米营养氮状况。整个季节都进行了传感和生物物理采样,用于分析和与计算出的 VI 进行比较。谷物产量稳定在 135±10 kg N ha –1 左右整个研究。此外,还发现 VI 与肥料 N 率之间的密切关系,其中最强的是使用包含红边波长 (720 nm) 的组合指数。关系在成长后期得到加强。发现响应模型是特定于传感器的、特定于 VI 的,并且在传感器之间大多不可转移。这项研究的结果证明了使用遥感技术更准确地预测玉米 N 状态以最终用于 VR 处方开发的实用性。
更新日期:2021-03-20
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