Application Of Remote Sensing Inversion Of Soil Moisture In The Irrigation Water Management Research

China’s agricultural acreage, irrigation water, and water resources relative shortage of, therefore, do a good job of agricultural irrigation water management to save water and improve the efficiency of water use is very beneficial. Soil moisture content is an important index for the management of irrigation water. It is the important index of drought monitoring and important basis for judging crop water requirement before the crop irrigation; after crop irrigation, its change is the important basis for the evaluation of irrigation effect. Thus, it is important to obtain the continuous and timely information of soil moisture content for the scientific management of agricultural irrigation water.In this paper, one of the Chinese three large irrigation in Hetao irrigation area as the test area, the method of soil water of Hetao Irrigation District in 2014 using thermal infrared inversion, at the same time, the model of crop water demand estimation, remote sensing monitoring and irrigation area model and actual irrigation model of remote sensing monitoring were established, to estimate the water requirement, crop irrigation area and the actual amount of irrigation in Yongji irrigation area of Hetao Irrigation area. The content of this paper and the related conclusions are as follows:Using the TVDI model inversion of soil moisture in Hetao irrigation area in 2014-04-21, 2014-05-11, 2014-07-16 and 2014-08-16, The results show that, the correlation between soil moisture content and soil moisture content can reach 0.7, can monitor of soil moisture content in irrigation water management.In Hetao irrigation area of Yongji irrigation area as an example, soil moisture correction factor was obtained with the spatial distribution of soil moisture by remote sensing inversion. The spatial distribution of crop water demand in the irrigation region of Yongji was calculated based on the model of crop water demand monitoring using remote sensing in 2014-04-21、2014-05-11、2014-07-16 and 2014-08-16, which can Improve the degree of water information in irrigation management.Monitoring soil moisture content, Irrigation area and actual amount of irrigation in the field of April 2015(From April 20 th to 28) before and after irrigation using remote sensing monitoring irrigation area and remote sensing actual irrigation quantity model in the irrigation region of Yongji which planting structure based on 2014. According to the soil moisture content after and before irrigation, the actual irrigation area can be calculated accurately; combined with the characteristics of soil water holding, the actual amount of irrigation and space distribution can be estimated. The results show that, the regional scope of irrigation is consistent with the actual monitoring, the remote sensing monitoring irrigation area is 10.5% compared to the results of ground statistics; the total actual irrigation in the field of remote sensing is slightly larger than that of the ground, and the difference is 9.91%.The soil moisture content of the remote sensing monitoring was applied to the crop water demand, irrigation area monitoring and field actual irrigation amount is important for irrigation water management to evaluate crop irrigation and to evaluate the utilization of water after irrigation.