ANALYSIS ON POLLUTION SITUATION OF MULCH FILM RESIDUAL IN FARMLAND SOILS IN QINGDAO CITY

摘要

The application of plastic film mulching technology poses a great threat to the safety and health of the agricultural environment while improving the agricultural productivity of China. In this paper, 27 representative crop planting areas were selected in five major agricultural production areas in Qingdao City, and the status of mulch residue in the soil of perennial mulched farmland was investigated. The results showed that the average residue was 32.3 kg hm-2, and the median value was 27.3 kg hm-2. Among them, the residual film volume of 7 crops was over 40 kg hm-2, and the average residue reached 69.3 kg/hm2, with a certain residual film pollution crop damage risk. There was no significant correlation between the amount of mulching film in the farmland soil and the planting pattern and the age of the film, however, it was related to the recovery rate of the residual film in the current season. The residual film size in the farmland soil is about 100 cm2, and more than 90% of the residual film is distributed in the 0-20 cm tillage layer. In order to control the residual pollution of farmland soil film, the biodegradable film should be actively researched and developed to solve the problem of PE film residual pollution from the source.