Study On Water Requirement And Crop Coefficient Of Typical Crops In Shule River Basin

With the continuous population growth,the continuous improvement of people's living standards and the rapid development of social economy,water resources demand continues to increase,water shortage crisis has become increasingly prominent,especially agricultural water resources is more scarce,the situation is more and more serious,has become The main factors restricting the sustainable development of regional economic society.At present,the intensity and scale of water resources development are getting bigger and bigger,the shortage of water resources is becoming more and more serious,and the utilization rate of water resources is not high.Especially,the situation of water shortage in arid areas is becoming more and more serious.In order to alleviate the current water shortage problem,Are actively exploring the study,to find a reasonable,feasible and effective solution to the problem of water resources,so that limited use of scientific and rational water resources to improve the use of water resources efficiency.The development and utilization of water resources in arid areas is mainly agricultural and the development of agriculture is very important to local economic development.The development and utilization of water resources in the Shule River Basin in the arid areas of Northwest China is close to or even beyond the carrying capacity of water resources,The proportion of agricultural water up to 90%,a serious shortage of water resources,scientific planning of water resources is currently a very important work.Because of the large difference of water demand between different crops,the research and analysis of crop water demand and crop coefficient,improve the efficiency of agricultural production water use,to provide scientific basis and data support to enhance the water resources management level of the river basin to improve water use efficiency and carrying capacity,Accelerate the construction of water-saving society,so that the utilization of agricultural water resources to achieve social,economic and ecological benefits of organic unity,promote and promote the sustainable use of river basin water resources and healthy development.Based on the meteorological data and irrigation experiment data of the experimental station in the basin,the water demand and crop coefficient of typical crops in the watershed—maize and alfalfa were studied.According to the meteorological data collected by the automatic meteorological system of the experimental station and the soil moisture data collected by the soil moisture automatic monitoring system,the main meteorological,hydrological elements and soils in the watershed were collected and sorted out.The relevant historical hydrology and meteorological data were collected and sorted out.Water samples were collected and analyzed by seasonal variation and characteristics.Using the Penman-Monteith method recommended by the Food and Agriculture Organization of the United Nations(FAO),combined with the meteorological data,the reference crop evapotranspiration was calculated.The water balance method was used to calculate the(K_c),and the variation law of K_c was calculated according to crop water demand and reference crop evapotranspiration value.To study and analyze the water demand and crop coefficient of each stage of the crop,we can guide the irrigation area to develop water plan and adjust the crop planting structure in the irrigation area to provide scientific basis and data support for the irrigation management of irrigation area,so as to improve the efficiency and efficiency of agricultural production and improve the management level of irrigation area,To achieve the rational development of irrigation water resources,efficient use and scientific management.