Modification and Validation of Ritchie Model for Evaporation of Maize Field in Saline Alkali Soil

In order to study the evaporation law of the soil between the corn trees of Daqing salt-alkali soil, the evaporation simulation value of different growth stages in the experimental period was compared with the measured value according to the Ritchie model theory, and the model fit was not well matched by using a homemade microsteaming seepage instrument to study the evaporation of the whole fertility period of corn in the green wind garden test area of Daqing High-tech Zone, as well as rainfall and soil moisture content. The accuracy of the two parameters in Ritchie’s model directly determines the accuracy of the model’s prediction of evaporation. The first U value and the second-stage α values were revised, respectively, and the model verification was based on the different growth-and-long-term values of corn, and the analysis showed that the average monthly rainfall was a function relationship with the average monthly evaporation. The modified Ritchie model has a maximum evaporation fit of 0.96 for maturity and a minimum fit of 0.91 for seedling. It provides an accurate evaporation prediction model for the accurate prediction of evaporation between saline soil corn classes in Daqing area and provides a theoretical basis for water quantity management and soil salinization prevention and control in the corn planting process.