Testing kinetic of nutrients release from complex mineral fertilizers coated with co-polyester films from pet waste recycling and effect on soil chemical properties
Published in Scientific Papers. Series A. Agronomy, Vol. LV-2012
Written by Amelia ANGHEL, Anca-Rovena LĂCĂTUŞU, Radu LĂCĂTUŞU, Stela IANCU, Mihaela LUNGU, Rodica LAZĂR, Andrei VRÎNCEANU, Claudia BĂLĂCEANU
The paper presents researches carried out in order to test complex mineral fertilizers coated with biodegradable copolyester films using as raw material the polyethylene terephthalate (PET) waste, such as plastic bottles for food. Achieving of biodegradable coatings, based on polyethylene terephthalate, requires modifying the chemical structure of aromatic polyester (PET) with dicarboxylic acids (aromatic and / or aliphatic), and / or other polyols, to create a biodegradable capsule for prolonged release mineral fertilizers. In order to highlight capacity of complex mineral fertilizers coated with co-polyester films, to releasing nutrients in the soil in an extended time period, unlike common complex mineral fertilizers, a green house experiment was organized. Soil material used was collected from two contrasting soil types in terms of physico-chemical characteristics, namely Luvic Phaeozems, and Calcaric Fluvisols. The experimental variants were set up in vegetation pots of about 20 kg soils / pot capacity, in which fertilizer materials were introduced, namely co-polyester films coated complex mineral fertilizers (N15P15K15) and regular granular complex mineral fertilizers. The crop was very early PR39D81 hybrid corn with excellent resistance to drought (hybrids belonging to the group FAO 200). Soil samples were collected during the plant vegetation, especially in the flowering stage and maturity stage (at harvest) for analyzing of the main chemical properties: soil reaction, organic carbon content, humus content, total nitrogen and nitrates contents, mobile phosphorus and potassium content in different fertilization variants. Data obtained in this experiment have been shown that the use of mineral fertilizers coated with co-polyester films in the proposed formula was beneficial for ensuring soil nutrients over a longer time, and thus, to be available to plants along the most vegetation period.