 This research demonstrated the potential of hyperspectral remote sensing observations to estimate light use efficiency, LUE, and gross primary production, GPP, in a cornfield. The authors found that combining the PRI and SAEF retrievals from Nadir hyperspectral reflectance measurements at 688 nanometers provided the best results for estimating GPP. Additionally, this study showed that the PRI and SAEF could be used together to improve the accuracy of GPP estimates. This article was authored by Yen Ben Cheng, Elizabeth M Middleton, Qingyuan Zhang, and others.