Effects Of Lake Sediment And Inorganic Fertilizer On Soil-vegetables System Nutrient And Cadmium

In recent years, with the rapid economy of society development, a large number ofindustrial wastewater discharged into freshwater lakes, leading to accelerated pollution ofmetal pollution in freshwater lakes. Heavy metal pollution in freshwater lakes includewater pollution and sediment pollution, and sediment pollution is particularly severe andcaused great harm to lake water quality because of long-term accumulation which wouldcause secondary pollution. Therefore, Recycling and Disposing the lake sedimentlegitimately are one of the important research for prevention and control of water pollution.Lake sediment resource utilization, which as today’s research hotspot, is one of the goodmeasures of solving lake sediment pollution problems since nitrogen, phosphorus, organicmatter and other nutrients are very rich in the lake sediment. Lake sediments contain alarge number of beneficial nutritive elements which are necessary for plant growth inagricultural production, thus it is the environmental method to combine lake sediment andinorganic fertilizer to apply to the agricultural production. However Lake sediment usuallycontains a large number of heavy metals which has become a key factor in restricting theresources utilization. In the process of plant growing, Small amounts of heavy metals canpromote the growth of plants, an excess of the heavy metals not only restrain plant growthbut also pollute the soil once again, even harm to human health indirectly. As a result,reasonable fertilizer of lake sediment and inorganic fertilizer as well as avoiding heavymetal pollution of soil and plant systems is of great research significance.In this paper, the effects of lake sediment and inorganic fertilizers on soil-vegetablesystem were studied, including Cadmium content of heavy metals in soils and vegetables,nutrient contents of soils and vegetables and the quality and production of the vegetables,through the method of combining field trials of cabbage and rape pot experiment.Effect of the lake sediment and inorganic fertilizer on nutrient of soil and pakchoi,heavy metal Cadmium and vegetables quality by field test. The results showed that lakesediment and inorganic fertilizer could increase nutrient content of soil and vegetable, atthe same time it led to the increase of Cadmium content in soil and pakchoi. Cadmiumcontent in soil were not overweight, when lake sediment input were more than637t·hm^-2,together with Inorganic fertilizer for N360P180K270(kg·hm^-2), the Cadmium content incabbage could exceed our country heavy metals in vegetables limited health standard. Lakesediment together with inorganic fertilizer could increase yield and improve quality ofChinese cabbage, and the nitrate content in Chinese cabbage vegetable were not more thanthe limited standards under different fertilizer treatment. In the sum, lake sediment(637 t·hm^-2) and inorganic fertilizer N360P180K270(kg·hm^-2) were good and environmentalsafety rate of fertilizer application for high yield cabbage.The study was conducted to investigate the effects of lake sediment and inorganicfertilizers on nutrients and heavy metals Cadmium accumulation of the soil and rapes plantand the quality and yield of rapes when using a pot experiment. The results indicated thatlake sediment and inorganic fertilizer could increase the nutrient content of the soil andrapes, at the same time lead to the increase in the Cadmium content of the soil and rapes.Heavy metal Cadmium content were not exceeded the standard in the soil, however,Cadmium content in the rapes beyonded tolerance limit of heavy metals in vegetables inChina when inputs of lake sediment were more than978t·hm^-2with N360P180K270(kg·hm^-2) as inorganic fertilizer application. The yield and quality of rapes increasedsignificantly with improving application of lake sediment and inorganic fertilizer, at thesame time the nitrate content of vegetables did not exceed limits at the different fertilizerconditions. Therefore, under this conditions of the test,978t·hm^-2of the lake sedimentsand N360P180K270(kg·hm^-2) as inorganic fertilizer were environmental safety applicationamount of high yield and quality of rapes.