Research on the Optimal Water Allocation of Rice Under Insufficient Irrigation Conditions

Rice is the representative of hydrophilic and humid crops, which consumes a large amount of water in the field. Southern China is the main rice-producing area. Relatively, weak water-saving awareness under the condition of abundant rainfall, climate change, and seasonal drought results in water shortage increasingly prominent. Based on the comprehensive consideration of rice water demand, water production function, water sensitivity index, and so on, an optimal allocation model of irrigation water under insufficient irrigation conditions is constructed to maximize the total yield of rice crops. The multi-constraint model is solved by the target approximation algorithm and the genetic algorithm. The results show that the genetic algorithm can effectively allocate the limited irrigation water.