**3.3. Impact on soil**

Long-term fertilization and indecomposable plastics solid waste make the soil barren for the crop cultivation. Besides, some plant residues contain the toxic chemicals (secondary metabolites, volatile terpenes, phenolic compounds), which can suppress the growth and production of other crops. This type of phenomenon is addressed as crop-crop allelopathy. Postharvest residues are mainly the source of this kind of allelopathic effects [28].
