Application of agricultural polyammonium acrylate or polyacrylamide hydrogels

This invention discloses methods for manufacture and use of poly(ammonium acrylate) and polyacrylamide hydrogels in agricultural applications. Such hydrogels are placed on the soil or the plants . Spraying is advantageous over other methods of program, like mixing with soil and broadcasting because of enhanced plant contact, evenness of supply, and reduced labor. The gels are prepared for spraying by adding water to supply a readily deformable plastic that can pass via a spray apparatus. The hydrogels sprayed may include additives including micronutrients, maconutrients, pesticides, microbes, plant growth regulators, surfactants, and freezing point modifiers. The use of this hydrogels prevents irrigation water and ameliorates salting of irrigated cropland. Sprayed hydrogels might also be used to protect plants from freezing and to protect foliage from desiccation.


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1. Field of the Invention

This invention relates to methods for implementing gels to agricultural soils and crops.

2. Description of Related Art


U.S. Pat.

No. 3,045,394 discloses the application of 0.5% aqueous solutions of polyvinylpyrrolidone utilizing sprays so as to reduce frost damage to plants.


U.S. Pat.

No. 3,555,727 discloses options of molasses in combination with nonionic, anionic, and cationic emulsifiers which are applied with sprayers to reduce irreparable damage to crops.


U.S. Pat.

No. 4,051,086 reveals a polyacrylamidepolysaccharide graft copolymer treated with glyoxal to maximize its wicking action. The copolymer is applied by coating on sand or soil particles.


U.S. Pat.

No. 4,303,438 discloses graft polymers formed from lignosulfate with acrylic acid or methacrylic acid which are used for improving soil structure. The graft polymers of the invention are said to be superior as”most of them can bediluted to any extent and coated without clogging of the nozzles.”


U.S. Pat.

No. 4,690,589 discloses forming a water-impermeable coating in soil with an aqueous solution of water-soluble poly(acrylic acid).


U.S. Pat.

No. 4,797,145 reveals treating agricultural soil with combinations of water soluble polyelectrolytes and polysaccharides.

Tanaka in Chemical Abstracts 109: 53920a, 1988, discloses a water retaining representative for agricultural lands made up of poly (ammonium)acrylate gel (PAA).

The prior art references don’t disclose the practice of employing insoluble hydrogels to agricultural lands or crops by spraying. In fact this property is not thought to be present in most polymers prepared for this purpose since it’s cited as anunexpected and extremely desirable land of graft polymers described in U.S. Pat. No. 4,303,438.

IP reviewed by Plant-Grow agriculture technology news