Practice and Exploration of Scientific Recycling of Agricultural Plastic Film in Nanchong City

Nanchong City is a major grain production city in Sichuan Province.The annual use of agricultural plastic film for grain and oil crop production and the amount of waste agricultural plastic film produced are very large.How to properly recycle agricultural plastic film and reduce the non-point source pollution of agricultural plastic film to agricultural environment has become an unavoidable subject of agricultural production in Nanchong City.In recent years,the scientific recycling of agricultural plastic film in Nanchong City has made great achievement.On the basis of statistical survey,this paper elaborated the main methods and results achieved,analyzed the existing problems,and came up with recommendations for the future work,in the hope of providing a reference for strengthening agricultural plastic film recycling in similar situations.

National mandatory standard on agricultural mulch film issued

The revised national mandatory standard on polyethylene blown mulch film for agricultural uses was officially issued in October 2017.The new standard defines the increase of the minimum thickness of mulch film,which can prevent the overuse of ultra-thin mulch film and promote the recycling and aging-resistance of mulch film,according to Sha Nansheng,Deputy-Director of Science and Technology Division,MIIT.

Calibration of the simulation parameters of the particulate materials in film mixed materials

In order to obtain accurate contact parameters of a particulate material in residual film mixture collected by cotton field machine in Xinjiang,the angle of repose test and inclined plane test were carried out.In the tests,the angles of repose of the particulate material with the water content of(6.26±1.5)%and(14.1±2.1)%were measured respectively,as well as the static sliding friction angle between the particulate material and the residual film.At the same time,the EDEM software was used to calibrate the coefficient of restitution,static friction coefficient and dynamic friction coefficient between the material and the film.Then,the second-order response model between contact parameters and the angle of repose and static sliding friction angle was constructed.In addition,the optimal contact parameters between the granular materials and the mulch were obtained by fitting the physical test data.The results indicated that the errors between the physical test results and the numerical simulation results are small.It was proved that the second-order response model could predict the repose angle of granular materials and the static sliding friction angle between granular materials and farmland film.This study could provide theoretical support for the subsequent model construction of the residual film mixture collected by the cotton field machine.

Environmental deterioration of farmlands caused by the irrational use of agricultural technologies

Without considering the ecosystem-depen- dence of agricultural production, irrational use of agricultural technologies could bring only short-term economic benefits but leave long-term environmental deterioration. If some agricultural lands have to be abandoned because of these technologies such as chemical films or groundwater depletion, it will aggravate the burden of remaining lands for maintaining or enhancing production. Thus, agricultural production should be a part of public services, requiring the consideration of interests of different stakeholders and sustainability.

A Novel Fluorescence Tool for Monitoring Agricultural Industry Chain Based on AIEgens

With the development of the global economy,the safety of agricultural production has attracted intense attention.To minimize the risk of harmful ingredients in the whole industry chain,it is very necessary to cover the entire process of safety inspections from planting to production to environmental management.Fluorescence sensing as a promising and powerful screening tool is widely used for the detection of ions,toxic gases,biological molecules and so on.However,traditional fluorescent probes often suffer from aggregation-induced quenching(ACQ)effects,which limits their practical applications.In this regard,aggregation-induced emission luminogens(AIEgens)can perfectly address this notorious issue and have shown great potential in agricultural safety analysis.In this review,we briefly summarize their applications in agricultural safety monitoring,including the fabrication of agricultural film,agricultural sewage treatment and selective detection of harmful residues in agricultural products.The challenge and future development of AIEgens in this field are also discussed and highlighted.Hopefully,this review can inspire more researchers to participate in this fascinating area.