湖泊底泥与无机肥配施对土壤-蔬菜系统养分和重金属Cd的影响

Effects of Lake Sediment and Inorganic Fertilizer on Soil-Vegetable System Nutrient and Cd

采用田区试验研究湖泊底泥与无机肥配施对土壤和小白菜养分、重金属Cd以及蔬菜品质的影响。结果表明,湖泊底泥与无机肥配施能增加土壤和蔬菜的养分含量,同时导致土壤与小白菜中重金属Cd的含量增加。土壤中重金属Cd的含量未超标,小白菜Cd的含量在无机肥施用为N360P180K270和湖泊底泥投入量大于637.0t/hm2时超出我国蔬菜中重金属限量卫生标准。随着湖泊底泥与无机肥配施量加大,可显著增加小白菜产量、提高小白菜品质,且不同配施处理下小白菜的硝酸盐含量均未超出我国蔬菜硝酸盐限量标准。因此,本研究条件下,湖泊底泥以637.0t/hm2和无机肥N360P180K270配施为小白菜高产优质的环境安全施用量。

Effect of the lake sediment and inorganic fertilizer on nutrient of soil and pakehoi, Cd and vegetable quality by a field test. The results showed that lake sediment and inorganic fertilizer could increase nutrient content of soil and vegetable, at the same time it led to the increase of Cd content in soil and pakchoi. Cd content in soil was not overweight, when lake sediment input was more than 637.0 t/hm2 , together with inorganic fertilizer for N360 P;80 K270, the Cd content in cabbage could exceed our country heavy metal content in vegetables limited health standard. Lake sediment together with inorganic fertilizer could increase yield and improve quality of Chinese cabbage, and the nitrate content in Chinese cabbage was not more than the limited standards under different fertilizer treatment. In the sum, lake sediment（637 t/hm2） and inorganic fertilizer N560 P180K270 were good and environmental safety rate of fertilizer application for high-yield cabbage.