DECOMPOSABLE AGRICULTURAL PLASTIC PRODUCTS E.G. FOILS CONTAINING SLOWLY RELEASING MATTERS OF MULTIPLE FOOD-VALUE EMBEDDED INTO THERMOPLAST ARTIFICIAL RESIN AND METHOD FOR PRODUCING SAME

摘要

A self-supporting degradable agricultural mulch film comprises: … …  (a) a first film formed from a composition comprising a water-soluble synthetic resin, at least one nitrogeneous material, at least one plant nutrient in addition to the nitrogeneous material(s), and, optionally, at least one nitrification inhibitor capable of retarding the release of the nitrogeneous material(s) from the first film, and …  (b) a second film formed as an adherent coating on the first film, the second film comprising a water-resistant synthetic resin and functioning to retard the degradation rate of the mulch film, to retard the rate of release of the nitrogeneous material(s), and to retard the rate of release of the plant nutrient other than nitrogen. …