Model development for prediction of soil water dynamics in plant production

Optimizing water use in agriculture and medicinal plants is crucially important worldwide. soil sensor-controlled irrigation systems are increasingly becoming available. however it is questionable whether irrigation scheduling based on soil measurements in the top soil could make best use of water for deep-rooted crops. in this study a mechanistic model was employed to investigate water extraction by a deep-rooted cabbage crop from the soil profile throughout crop growth. the model accounts all key processes governing water dynamics in the soil-plant-atmosphere system. results show that the subsoil provides a significant proportion of the seasonal transpiration,about a third of water transpired over the whole growing season. this suggests that soil water in the entire root zone should be taken into consideration in irrigation scheduling,and for sensor-controlled irrigation systems sensors in the subsoil are essential for detecting soil water status for deep-rooted crops.