Research On The Effects Of Zeolite On Water Irrigation Paddy Field Soil Environment And Rice Growth For Lead Pollution

Lead factors are brought into the land and water environment by natural and human activities,and they pose a threat to the safety of crops and people's health.Rice is one of the main food crops in our country,which is important in grain production,and the irrigation water in some areas has different levels of lead pollution.To explore the effect of using zeolite on soil environment and yield of rice and rice quality when the lead has polluted the water irrigation,and the accumulation and growth traits of the lead in rice plant,This paper regards rice as the material and adopts the micro area experiment based on the global research of the lead pollution of plant growth.Besides,the rice soil was applied different addition amount of zeolite(0?2500?5000kg·ha-1)and irrigated with different concentrations(0?0.25?0.2?0.15mg·L-1)lead wastewater during the period of growth,analysis of the effect of zeolite on lead pollution water irrigation paddy soil potassium,phosphorus,total nitrogen,total carbon,the influence of pH value and yield of rice,and rice quality and lead accumulation in rice plant and the influence of the rice growing.The main results were as follows:(1)Effects of zeolite on potassium,phosphorus,total nitrogen,total carbon and pH value of paddy soils irrigated by lead contaminated water.When no zeolites were applied,the lead sewage inhibited soil pH and the contains of instant potassium,total nitrogen,total carbon and the low concentration lead sewage activate instant phosphorus contains.When water is irrigated,zeolite reduces soil total carbon and instant phosphorus contains,improves soil pH,and increases soil nitrogen and instant potassium contains for W1.Under low concentrations of lead sewage irrigation,zeolite increase soil instant potassium and pH value,reduce the soil instant phosphorus and total carbon contains.When the quality of zeolite equals W2,soil total nitrogen contains will be lower.(2)The effects of zeolite on the growth of rice crop of paddy soils irrigated and rice yields by lead contaminated water.Lead in irrigation water inhibits the height of plant and tillering,and the effect of the increase on the concentration has no regularity.Under the water irrigation with the same lead factor concentration,the zeolite accelerates the plant height,above ground dry weight and dry weight,and its effect on the underground part varies because of irrigation water lead concentrations.The higher the lead concentration,the greater its promoting effect will be suppressed.Zeolite has promoting effect to the rice yield by irrigation low concentrations of lead water irrigation,when zeolite seems is different,the influence on rice yield is different,When the application of 2500 kg·ha-1,the rice production were reduced,the higher of lead water concentration,the more obvious;The application of 5000 kg·ha-1,the yield of rice were promoted.(3)The effects of zeolite on rice quality by lead contaminated water.With the decrease of lead concentration in irrigation water and the increase of water content,the effect of zeolite treatment on water content was higher than that of lead.With the increase of zeolite content,the protein content decreased,zeolite treatment had negative effect on protein content,but lead contaminated water had positive effect to protein.And the content of starch in rice decreased with the increase of zeolite content.Under different treatments,the water content and amylose content of rice was accorded with green rice standard.(Water?15.5%,amylose 13.0%?20.0%).(4)The effect of zeolite on lead-contaminated water irrigation of soil,the concentration and migration patterns of lead in soil and rice systems.The lead enrichment coefficient of rice organs can be arranged:root>stem>leaf>rice,when the lead sewage and concentrations in irrigation are steady,and its applying amount of zeolite is W2,the enrichment coefficient of lead in root will significantly increase while Pb enrichment coefficient in stem,leaf,and rice will decrease.The migration coefficient of Pb in stem,leaf and rice will decrease as the amount of zeolite increase.