Abstract: To effectively control the pollution of the residual membrane and promote the application of degradable plastic mulch film in maize planting,different kinds of the mulched maize field,including the field degradation characteristics of different kinds of degradable plastic mulch film and their effects on the maize yield were studied.The results showed that,compared with bare land planting,the mulched maize planting could increase the ground temperature,and the maize yield was significantly increased when using mulching with films,but not with the ordinary PE film.The degradation effect of six kinds of biodegradable plastic mulch film was better than the PE film.In the exposure experiment,the degradation of the photooxidation-biodegradable plastic mulch films from three manufactures was faster than the full biodegradable plastic mulch films,with the degradation starting in 40 days after covering the film.In the field experiments of mulched maize,the six kinds of biodegradable plastic mulch films were in the stage of large area cracking period when the experiment of maize mulching culture was carried out till the harvest time.In the landfill experiment,the total biodegradable plastic mulch film from 3 manufacturers showed an accelerated degradation when they were buried for 180 days,but the photooxidation-biodegradable plastic mulch film from 3 manufacturers did not degrade in the process.Therefore,it is feasible to replace the PE film with the biodegradable mulch film in the planting of mulched maize of harqin county.

Key words: Full biodegradable plastic mulch film, Photooxidation-biodegradable plastic mulch film, Maize, Effects of degradation, Yield