Technique For Slight Salt-Water Reusing Irrigation Research

Huabei plain is relatively shortage of water resource area in china. Tianjin islocated on the lower basin of the Haihe river, due to its special nature geographicalfeature, Tianjin is lack of water resources supply. Agriculture is threatened by floodand lack of water. Tianjin is one of the areas, which are sufficient in water resource,whose average amount per person is 160m3. The problem of the lacking in waterresource is very serious in Tianjin. Since 1980s, the increase shortage of waterresources has seriously restricted by the rapid economic development of the world.In order to supply water safety to the city, Tianjin government has established thepolicy that water for cities and towns domestic is priority to water for industry, waterfor industry is priority to water for agriculture.To overcome the problems of lack of water resources and need of developing ofwater-saving agriculture situation, the exploitation of shallow slight salt water andsalt water and reuse of wastewater are new agriculture resource at present and in thefuture in Tianjin. This technique is reusing the slight salt water and salt water of3-5g/L content for irrigation in heavy clay soil, in order to achieve the objective ofthe water saving, high production and low-cost. Research in different clay soil, wellstructure and drilling well technology, enlarge well water quantity supplying,achieve to get high production, reusing salt water for irrigation, and realize theagriculture sustainable development. Establish a guideline for using slight salt water(less than 5g/L content) for farm irrigation. Develop a new technique for slightsaltwater irrigation construction system, shallow well (30m depth) constructiontechnique and well structure.Technique for slight salt-water reusing irrigation overcomes the problem ofshallow clay soil, extending slight salt-water content level of EPA for irrigation.Research indicates, slight salt water can flow into depth salt water in naturecondition;deep salt water can flow into shallow slight salt water by exploitation.Research test proved, the technique for digging well by pumping slurry can protectwall of well, is suitable for exploitation shallow slight salt water.