Multilayer degradeable and controlled release multinutrient mulc

Details Multilayer degradeable and controlled release multinutrient mulc Multilayer degradeable and controlled release multinutrient mulc

1987-07-09

1989-07-11

Lander, Ferris H.

Plant husbandry

Mulching

428518, 71 28, 71903, 71 3, 71 6411, A01G 700

Patent

active

048458880

ABSTRACT:
A degradable agricultural mulch film as disclosed herein includes a plurality of layers for the controlled release of plant nutrients. The first layer is formed from a water-soluble synthetic resin, a releasable form of nitrogen and a releasable form of a plant nutrient in addition to nitrogen. A second layer includes a water-soluble synthetic resin having an average molecular weight which is greater than the average molecular weight of the water-soluble synthetic resin in the first layer and a releasable form of nitrogen admixed therein. The second layer also includes a thin film of water-resistant polymer to retard the degradation rate of the second layer and to slow the release of nitrogen in the second layer. And in the preferred embodiment of the invention a second film of water-resistant polymer which is relatively thin with respect to the first film separates the first and second layers.

REFERENCES:
patent: 4686790 (1987-08-01), Lahalih et al.

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