The Kalman filter assimilation technique is applied to a simplified soil moisture model for retrieval of the soil moisture profile from near-surface soil moisture measurements. First, the simplified soil moisture model is developed, based on an approximation to the Buckingham–Darcy equation. This model is then used in a 12month one-dimensional field application, with updating at 1-, 5-, 10-, an...

In Xinjiang's perennial cotton (Gossypium hirsutum)-planting soil, the average residual amount of plastic film is as high 265.3 kg/hm2, and problem pollution with in tillage layer has become a major problem. To explore mechanism separation soil determine conditions favorable for film-soil, this study established constitutive model film-soil contact based on discrete element method used to simul...