Extraction and spatio-temporal analysis of phenological dates of winter wheat in north Henan Province of China from 2003 to 2018 based on MODIS NDVI time series.

From 2003 to 2018, the growth of winter wheat in northern Henan from the trefoil stage to the milky stage showed a trend of shortening, consistent with the relevant research results [ 32 , 33 ]. 4.4.2 Differences in regional changes of the phenological stages in northern Henan The average regression slope value of each city in the northern Henan was calculated to evaluate the difference of changing trend of phenological periods in the cities ( Fig 7 ).

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