XXXX film incorporation into the horticultural soil of small periurban production units in Argentina.

@entity691 @entity22429 @entity14459 @entity316 @entity10687
UNASSIGNED: Horticulture makes intensive use of soil and extensive use of @entity691 (PE) sheeting and pesticides, producing an environment where the dynamics between soil and plastics can affect pesticide fate. We have determined that the presence of plastic residues in the horticultural soil of small production units equals 10% of the soil area, being meso and macro-sections the predominant fragment sizes. All soil samples were taken from different plots located in Cuartel V, Moreno district, in the suburbs of Buenos Aires city, Argentina. Laboratory experiments were conducted to see the relations among pesticide, soil and PE film. Endosulfan recovery from LDPE films (25 m and 100 m) was studied, observing evidence that indicated migration to the inside of the plastic matrix. To further analyze the dynamics of pesticide migration to soil and atmosphere, experiments using @entity10687 , @entity22429 and @entity14459 were performed in soil-plastic-atmosphere microenvironments, showing that up to 24h significant amounts of pesticides moved away from the PE film. To determine whether PE residues could act as potential pesticide collector in soil, column elution experiments were done using @entity10687 , @entity22429 and @entity14459 . Results showed an important pesticide accumulation in the mulch film (584 g-2284 g pesticide/g plastic) compared to soil (13 g-32 g pesticide/g soil). Finally, chemical and photochemical degradation of @entity316 adsorbed in PE film was studied, finding a protective effect on hydrolysis but no protective effect on photodegradation. We believe that a deeper understanding of the dynamics among soil, plastic and pesticides in horticultural productive systems may contribute to alert for the implications of PE use for plastic sheeting.
