The residual and broken microplastics(Microplastics,MPs)of mulch film continue to increase,which has become one of the important sources of MPs in farmland soil.A pot experiment was conducted to analyze the effects of mulch film MPs treatment levels(0.5%1%and 2%)on the morphology,physiology,biomass and nutrient absorption of corn.The results showed that compared with the control(CK),0.5%mulch film MPs had no significant effect on the growth of corn.With the increase of MPs levels of mulch film(1%and 2%)and the prolongation of exposure time(jointing stage and heading stage),corn plant height,stem width,leaf area,root length and surface area and biomass decreased significantly.The decrease of chlorophyll content and SOD enzyme content and the increase of MDA content in leaves indicated that mulch film mulching MPs caused photosynthetic damage and oxidative stress in corn.Higher levels of mulch film MPs(1%and 2%)also inhibited nutrient absorption by corn.The inhibition of MPs accumulation of soil mulch film on crop growth may reduce the advantage of mulch film mulching cultivation.
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