Sewage Irrigation On Crop And Soil

In recent years, both the shortage and the pollution of water resources are deteriorating gradually. Therefore, the irrigation with sewage has become an important way to save water, which is widely used now. However, with the development of sewage irrigation, people are becoming more and more concerned about the effect of the minimum element in the sewage, especially the heavy metal ion on the crops and soil environment. Based on the researches both at home and abroad, the paper studied on the influence of heavy metal such as Cr, Pb on the field and crop's growth by means of field experiments on wheat and maize. This paper has been listed on the basis of reading and analyzing large amount of document data, has summed up the theory being related to the problem detailed, the result shows that:In local test, the investigation on the heavy metal inside crops shows that the number inner spring wheat are as following, Pb> Cr, while the number is largest in root. Besides that, there is much more heavy metal in the parts of flower, leaf and root than in the stem and seed. After Irrigation (heavy metal contents are less in sewage water) ,heavy metal all falls off to some extent in soil , the Pb , Cr accumulation are related to the kind of foul water in the maize and the wheat; The foul water effect physiology of the maize and the wheat , broad irrigation may possibly make output increase by , It can be say that moderate broad irrigation has acted on crop growth; Pot culture wheat Cr,Pb alone effect left ting over heavy metal is more than r Cr,Pb both effect in body, at the same time, it's opposite for mass and the rate of photosynthesis in wheat. The irrigation initial stage transfusion effect plays main role for soil middle Cu ion concentration distribution , the Cu ion is hit by the prompt irradiation with soil transfusion in soil; Later , the transfusion effect are not already notable , distribution of Cu ion is effected mainly by the soil adsorption and the ion. the Cu ion has gathered in the soil that 65 cm depths.