Monitoring Freeze Injury to Winter Wheat Using Remote Sensing

Freeze injury is a common disaster for winter wheat, and monitoring freeze injury using remote sensing is of great economic significance, but little research work about it has been done in China. Freeze injury is related to crop growth stage and low air temperature in spring. Daily meteorological and agricultural observation data including daily lowest air temperatures and soil surface temperatures from 76 stations from March 1st to April 30th in 1995 and NOAA AVHRR images in the eastern China's Shandong Province were analyzed and an applied freeze injury monitoring method was developed. Freeze injury happens when NDVI suddenly reduces at cold air temperature and winter wheat is at a susceptible growth stage in spring.