Identification And Optimization Of Soil Water Movement Model Under Drip-Irrigation

Water is the source of all life on earth, water resource is very important in our life. Our daily production and life is inseparable from the water. The current global water resource condition is very serious, shortage of water resources is very badly. However, our country is lack of water badly, The extreme shortage of water resources and uneven distribution seriously restricts the development of our country’s economy.At present, the agriculture irrigation water consumption is very large, occupies the big proportion of the total water consumption. But there is a very serious waste phenomenon, the main reason is that many irrigation areas in China still adopts the traditional way of extensive irrigation. This kind of phenomenon is very common in the north of our country some agricultural irrigation area. So in order to solve the problem, our country promote water-saving irrigation. Drip irrigation technology is popular water-saving irrigation technology, it is more advanced all over the world. It can provide timely and right amount water for crops and fertilizers. Drops head flow relation with the quality of irrigation, affects the soil nutrient and moisture transmission. And it plays a very important role in the crop growth. Exploration and analysis of the transmission law research of soil moisture under the environment of drip irrigation, is the foundation for us to carry on the design parameters of drip irrigation, the precise management of farmland irrigation is of great realistic significance Samples were get from Changji region in Xinjiang, I observed the water conveying distance data. According to the observation data analyzed and summarized, I set up a first order transfer function model between water conveying distance and drop head flow. I used the genetic algorithm to optimize and identify several parameters of the model. In the same drip environment and water amount, I compared and analyzed the condition of soil water movement under the different drop head flow, and verified the first order transfer function model is effective. Through the model, we can design irrigation systems, and can realize timely right amount ground water and nutrient supply for crops root target, greatly reduces the waste of water resources.