Retrieving rice (<i>Oryza sativa</i> L.) net photosynthetic rate from UAV multispectral images based on machine learning methods.

Generally, the VIs had a better relationship with Pn at the jointing–booting stage, but the r value became worse as the growth stage advanced; however, it might be that the number of samples was relatively small and therefore no VIs passed the highly significant correlation test ( p < 0.01).

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As shown in Figure 2B , SPAD generally showed a trend of initially increasing (N1–N3) then decreasing (N3–N4) and finally ending up with a small increase (N4–N5) with the increase of nitrogen application under the same leakage conditions.

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