A comparison between different vegetation water indices in the ability of monitoring water status of wheat in April

Abstract

Using the data of wheat spectrum and water content in 6th April and 23rd April, we figure out the values of NDVI, NDWI, GVMI, PVI and WI, which are among the most frequently used water indices, and make correlation and regression analyze between these indices and EWT and FMC, two indices indicate the water content of wheat leaves. Through analysis and comparison, we find that FMC has a better correlation with water indices than EWT in this period, that in different period the best water index to monitor the water content of wheat is different, and that along with the growth of wheat, the effect of these indices in monitoring water content of wheat becomes much better.