IRRIGATION OPTIMIZATION BY MODELING OF PLANT-SOIL INTERACTION

摘要

Irrigation scheduling is an important issue for crop management,rnin a general context of limited water resourcesrnand increasing concern about agricultural productivity.rnMethods to optimize crop irrigation should take into accountrnthe impact of water stress on plant growth and thernwater balance in the plant-soil-atmosphere system. In thisrnarticle, we propose a methodology to solve the irrigationrnscheduling problem. For this purpose, a plant-soil interactionrnmodel is used to simulate the structural-functionalrnplant growth conditioned by water status. The system dynamicsrnis driven by a delay differential system. By consideringrna price for the crop yield and for the water resource,rnan optimal control problem can be formulated inrnorder to find the optimal irrigation strategy. The solution isrnobtained by dynamic programming. In order to handle therndelay term of the system due to the continuous mechanismrnof plant senescence and the curse of dimensionality, the iterativernapproach of dynamic programming is used.