Effects To Crops And Soil Under Polyethylene As The Main Ingredient Of Degradable Plastic Film

It is an important way for preventing"white pollution"to develop and promote environment-friendly biodegradable plastic film, which is holding back the development of agriculture. Compared with ordinary plastic film, biodegradable plastic film takes less time to degrade, and it has low molecular weight residues, mainly linear low density polyethylene (LLDPE). The research into the effect of low molecular weight polyethylene ( LMWPE ) on horse bean growth and soil microenvironment was of great significance to promote use of biodegradable plastic film. In the experiments, we simulated natural conditions and different molecular weight polyethylene particles were added in different dosages to pot-soils in which horse bean were planted. The plant height leaves numbers and pod numbers were measured during whole growth periods, as well as the activities of urease, peroxidase and sucrase in the soil responding to LMWPE. During the whole growth period, compared with the processing of cultivated horse bean and not added of LMWPE (CK1), plant height, leaf numbers and the activities of Urease, peroxidase which the processing of added LMWPE (Addition by covering plastic film 1, 10, 50, 100 conversions) and the cultivation of horse bean were significantly higher than CK1 treatment. The more polyethylene were added, the higher significantly the soil enzyme activities, plant height and leaf numbers, but the soil invertase activities and the pod numbers had no significant difference. It showed that LMWPE have no adverse effects to the growth of horse bean and soil enzyme activities, there were significant positive correlation between plant height and the numbers of leaf and pod.