Study On The Amount Of Improved Utilization Of Soil Water Resources By Mulching Field In Baoding Plain

Baoding plain is a primary bread basket in Hebei province, winter wheat, maize and cotton are the main crops. The special geographic position and weather condition of Baoding plain lead to the complexion that short of water is a natural problem, and it also determined the peculiar status of irrigation in the farming. In Baoding plain, more than seventy percent of the total consumption of water is agricultural using water, which is the main consumption of water resources. In recent years, the demand of industrial using water and living using water are increasing continually because of population expanding and industry developing, which occupied large of agricultural using water and threatened the produce of food supplies and the sustaining development of agriculture.Agricultural water resources not only include the irrigation water resources but also involve the soil water resources supplied by precipitation directly. The reserve of soil water resources is abundant, if we make full use of it we may find that it will substitute a large number of irrigation water, and it also has a significant meaning to relax the contravention that existed in the demand and supply of water.At present, more and more experts and scholars have realized the function of soil water resources to agricultural cultivation, but there is no an embedded and subtle research about the effect of filed mulching on improve the utilization of soil water resources. This paper carried out a systemic study bases on the former study of the experts on the soil water resources and the effect of field mulching on improve the utilization of soil water resources in Baoding plain. The main contents are: ①Put forward the meaning of soil water resources;②Confirmed the calculating model of soil water resources, analysed the dynamic variety of soil moisture and the amount of soil water resources in the year of different frequency;③Combining the water requirements of main crops, analysed the amount of soil water resources and the excess and deficit of soil water resources of main crops in their growing stage to supervise the irrigation;④Clarified the characteristic of the effect of field mulching on water saving and yield increasing, carried out the typical investigation to the effect of field mulching, analysed the amount of saving water and increased yield of different crops of different mulching measures, and according to the above results as the current standards, analysed the amount of improved utilization of soilwater resources of different crops of different mulching measures in the year of different frequency because of the improved WUE;(§)Combining the current area of mulched field of different crops, calculated the total amount of the improved utilization of soil water resources in the year of different frequency in Baoding plain, this is also the amount of irrigation saving water. In current conditions, we can save 7.7> 7.2> 5.1 percent of the total amount of agricultural using water in the year of different frequency by mulching field, and the effect of field mulching is prominent.The aim of the paper based on the study is to ascertain the reserve of soil water resources and the effect of filed mulching on water saving in Baoding plain, and also in order to provide the academic basis to make full use of soil water resources to saving irrigation water. It has great realistic significance to relax the status of short of water and ensure the sustaining development of agriculture and improve the entironments.