Estimation of Evapotranspiration and Crop Coefficient of Chinese Cabbage Using Eddy Covariance in Northwest China

Chinese cabbage is a key vegetable crop in northwest China. It of great significance to study the evapotranspiration (ET) and coefficient (Kc) for agricultural water-saving management this area. Eddy covariance (EC) was used measure ET Kc China from 1 May 16 October 2020, order analyze characteristics these variables under plastic mulch. The results showed that average first higher middle late stages, with values 1.08 1.09 during heading maturity respectively. second stage, 1.10 1.13 rosette annual 0.81. Although periods, water use efficiency still 28.96 kg·ha?1·mm?1. 505.3 mm. revealed variation pattern cabbage, which provides an important scientific basis irrigation guide practice planting.