We evaluated the optical and thermal reflectance of maize (Zea mays L.) interseeded with cover crops using remotely sensed canopy temperature and multispectral imagery. In 2017 and 2018 annual ryegrass (Lolium multiflorum Lam.), crimson clover (Trifolium incarnatum L.), oilseed radish (Raphanus sativus L.), and a mixture of annual ryegrass and crimson clover were interseeded in maize at V3 and V6 at three different cover crop seeding rates in small research plots at two experimental farm sites within the network of Michigan State University. The same cover crop species were interseeded in maize at V3 and V6 at a single seeding rate in on-farm replicated strip trials and also a full-scale field trial at five locations in Michigan. Canopy temperature and multispectral reflectance were remotely measured 10–12 times throughout each season at all sites using fixed wing aircraft at 1-m spatial resolution. Optical and thermal reflectance were also measured remotely using an unmanned aerial vehicle (UAV) with 2-cm spatial resolution three times during the growing season at the small plot sites. Normalized difference vegetation index (NDVI) and normalized difference red-edge (NDRE) were calculated for each of the experimental sites. No significant differences were detected between the interseeded treatments and control with regards to the optical and thermal reflectance and maize grain yield. Variability at field scale was due to inherent differences and not caused by the interseeding treatments.

中文翻译：

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使用遥感图像评估跨空间尺度与覆盖作物播种的玉米的高分辨率光学和热反射率

我们使用遥感冠层温度和多光谱图像评估了与覆盖作物间种的玉米 ( Zea mays L.)的光学和热反射率。2017、2018年度黑麦草（Lolium multiflorum Lam.）、深红三叶草（Trifolium incarnatum L.）、油菜萝卜（Raphanus sativusL.)，在密歇根州立大学网络内的两个实验农场的小型研究地块中，在 V3 和 V6 的玉米中以三种不同的覆盖作物播种率将一年生黑麦草和深红色三叶草的混合物种在玉米中。在农场重复条带试验和密歇根州五个地点的全面田间试验中，相同的覆盖作物物种以 V3 和 V6 的单一播种率在玉米中播种。使用固定翼飞机以 1 米空间分辨率在所有地点每个季节对冠层温度和多光谱反射率进行 10-12 次远程测量。在小地块的生长季节期间，还使用具有 2 厘米空间分辨率的无人机 (UAV) 远程测量了光学和热反射率 3 次。计算每个试验点的归一化差异植被指数（NDVI）和归一化差异红边（NDRE）。在光学和热反射率以及玉米籽粒产量方面，未检测到间种处理和对照之间的显着差异。田间规模的变异是由于内在差异而不是由间种处理引起的。