Due to the cold weather, no crops were growing in the northeast of China during this monitoring season (October 2019 to January 2020). CropWatch Agroclimatic Indicators (CWAIs) showed that all agricultural meteorological indicators were close to average level. Overall precipitation decreased by 3%, but was significantly above average in late October, mid-November and mid-December. The photosynthetically active radiation decreased by 1%, and temperature decreased by about 0.7°C. The temperature was close to average level in October and November, and increased to above average level in January 2020.
For the potential biomass, most areas are above average in the northeast China. Since the potential biomass is the result of the synthesis of agricultural meteorological conditions, the higher potential biomass indicates favorable agricultural meteorological conditions during this monitoring season in northeast China. If the rainfall and temperature remain appropriate until the sowing period, it will also be conducive to the emergence and early growth of crops.
Figure 4.7 Crop condition in northeast China in 2019
(a) Crop condition development graph based on NDVI
(b) Spatial distribution of NDVI profiles
(c) Time series rainfall profile
(d) Time series temperature profile
(e) Maximum VCI
(f) Potential biomass departure from 5YA