Effects of Microbial Fertilizer on Yield and Quality of Head Lettuce
In view of the problem of excessive amount of chemical fertilizer in the production of lettuce in Beijing suburbs,the effects of partial replacement of chemical fertilizer by microbial fertilizer on the yield and quality of head lettuce in spring greenhouse in Beijing were studied by setting three treatments:conventional fertilization(T1),nitrogen reduction fertilization(T2)and partial replacement of chemical fertilizer by microbial fertilizer(T3).The results showed that compared with conventional fertilization,nitrogen reduction fertilization hindered the growth of head lettuce and reduced the yield.The partial replacement of chemical fertilizer by microbial fertilizer promoted the growth of head lettuce,and significantly increased the mass per plant and yield of lettuce.T3 treatment improved the quality of head lettuce,significantly reduced the nitrate content,and increased the content of vitamin C.The total nutrient input of T3 treatment was the least,and the N partial productivity reached 730.92 kg/kg,which was 57.17％higher than that of T1.Therefore,the microbial fertilizer part of the chemical fertilizer,not only reduced the input of chemical fertilizer nutrients,but also increased the yield of head lettuce,improved product quality,could be used as one of the recommended fertilization measures in the production of head lettuce in the suburbs of Beijing.
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