Study On Reclaimed Water Irrigation Security On Grain Of LongKou City

This article researched the wheat and corn which are irrigated by reclaimed water throughthe laboratory and field test. In the test four irrigation scheme are used and the irrigation wateris reclaimed water after the treatment of sewage treatment plant of Longkou City. And analyzethe effect of the reclaimed water used for irrigation on groundwater, soil, crop yield indicators,quality indicators and toxicological indicators. The results prove that the reclaimed water canbe used for agricultural irrigation under certain conditions.(1) Combined with the original heavy metal content of the reclaimed water with the fieldtest method to determine the soil heavy metal content, and determine the heavy metal in the soilof residual degree. Through sampling from the0-60cm layer of soil, test and analyze thecontent of heavy metals in each layer. Discusse the result in different irrigation level and theheavy metal content change over time under the conditions of reclaimed water irrigation. It isproved that under the certain conditions and in the short term (the time of the test is2years),reclaimed water irrigation won’t influence the soil environmental significantly.(2) Using the indoor soil column test to research the heavy metal elements migration.According to the shandong province agriculture irrigation water rationing, assurance P=50%,take net irrigation quota200m3/mu years. The testing time is3years. And each pillar needtotal water7.2L according to the fixed year. Collecting filtrate from the bottom of soil columnafter the trial starts, and then to number each collect samples, seal. After the test, testing thesample filtrate, through analysis the heavy metal content in the filtrate, and analysis theinfluence of using the recycled water irrigation for groundwater, it is proved that under thecertain conditions and short term reclaimed water irrigation won’t affect the groundwaterquality.(3) Study the yield, quality and the heavy metal content of the winter wheat and maize indifferent irrigation level and different irrigation water recycled water irrigation through thefield test, Evaluating the affect on the using the reclaimed water for irrigation on the quality ofwinter wheat and maize yield. Analysis the accumulation of heavy metal elements in theorganization situation of different crops, through analysis the specific data, it is showed that incertain conditions of short term (the time of the test is2years) reclaimed water irrigation of the crops will not influenced the yield, quality and the accumulation of the heavy metals of thecrop.