Degradable agricultural plastic articles, e.g., mulching film, comprising slowly released multinutrients in matrix of thermoplastic, and process for preparing same
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United States of America Patent
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-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Oct 29, 1985
filing date -
Oct 29, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An agricultural mulch film is prepared by mixing conventional plant nutrients with a water-soluble polymer such as polyvinyl alcohol. The mixture is cast in the liquid form and allowed to dry to form a thin film. The dried film is then coated with a thin layer of a water-resistant resin such as polyvinyl acetate to form a composite mulch film. The release of the nutrients contained in the mulch film is controlled by the addition to the water-soluble polymer mixture of either (1) a nitrification inhibitor along with urea, or (2) a water-soluble urea-formaldehyde condensation product. The release of the nutrients is also controlled somewhat by the water-resistant resin coating. Other additives may be added to the mulch film to produce a multi-purpose product.
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