Study On The Irrigation Technique Of Slight Saline Water In NingXia Diversion Yellow River Irrigation Area

This thesis aimed at the technique of the slight saline water irrigation which needed to solved immediately in Ningxia Diversion Yellow River Irrigation Area,and the paper depended on saving water irrigation experiment field at XiYongGu township of YanZiDong of District of HuiNong City where belongs to Ningxia Diversion Yellow River Irrigation Area and adopted orthogonal test design and infiltration experiment after studied completely the present situation and trend of the technique of the slight saline water irrigation. The method of different slight saline water irrigation, the moving regulation of soil water, soil salinity and groundwater which were influenced by the slight saline water irrigation were systematically studied on in this thesis, the study results are as follows.-1 The study situation and the trend of slight salt water irrigation technique were summed up at home and abroad, and it pointed out the research direction of slight saline water irrigation utilization.2 According to the basic principle of TDR and object which the soil of the typical plain was silted up in Ningxia Diversion Yellow River Irrigation Area, It was the first time that measuring soil moisture and calibrating empirical formula of measuring soil salt content at home:Y=1.20587+3.001637 X₁-0.0188487 X₂. It is good for making the best of this kind of instrument and reducing test work in Ningxia Diversion Yellow River Irrigation Area.3 By orthogonal test design, the paper analysed slight saline water irrigation for corp corn physiology index and effects of product, and got method and measure of safely utilizing slight saline water irrigation under keeping much higher product and keeping soil from salt harm intimating through two—year exprement.4 Application many goal decision model,the paper enduced degree of among factors by experiment and analyzed the method of different slight saline water irrigation.The result accorded with the field experiment and validated nicety the selecting method of different slight saline water irrigation.5 Through the indoor experiment, the paper adoped the model of soil water to imitate the moving regulation of the slight salt water irrigation. The results are precise and can be used in water—salt moving simulation prediction.This paper has solved the problem of application of the slight salt water irrigation in Ningxia Diversion Yellow River. It was important to improve the efficiency of water resources, solve the problem of lacking water and avoid to soil salinization and safeguarding water environment in NingXia.