3 Results 3.1 Accuracy evaluation of UAV multispectral image data The UAV images were subjected to reflectance extraction of different band spectra according to the plots, as shown in Fig 3 , the spectral reflectance of different fertility periods were all in the band range of 450–550 nm, and the spectral reflectance curves of different regions showed an increasing trend, and the phenomenon of green wave peaks appeared around 550 nm, which was more consistent with the results of the literature.
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Remote sensing estimation of sugar beet SPAD based on un-manned aerial vehicle multispectral imagery.
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The sentences
Chloro-phyll content is a highly significant indicator for photosynthesis and growth development in crops.
The coefficient of variation of SPAD of sugar beet under normal irrigation showed a decreasing trend compared to the drought stress data, and also the SPAD of this population under normal irrigation was greater than that under drought stress during the rapid growth period of leaf clusters.