Granular products for soil treatment
AssigneeAirwick Industries, Inc.
InventorClaude Hennart
Life of this patent
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Abstract
Granular products for the treatment of soil are described which comprises a central solid nucleus containing fertilizer, herbicide, or a mixture of fertilizer and herbicide, all soluble in water without decomposition, as well as, about each product a coating consisting of solid materials at least 40% of which are soluble in water without decomposition, and at least 15% of which consist of active material different from that of the nucleus, and a polymeric resin the amount of which does not exceed 10% of the total weight of the coating. Comparative tests are described which show that these novel granular products can be as readily dissolved in the soil as uncoated fertilizer granules.
Claims19
Coated granular product for the treatment of soil which comprises a central solid nucleus, constituting from about 65 to 99% of the weight of the granule, said nucleus consisting of at least 40 to 100% of its weight of a fertilizer material which is soluble in water without decomposition, and a coating of one or several layers constituting from about 1 to 35% of the weight of the granule, at least one layer of said coating comprising particles of an active substance different from that of the nucleus and selected from fertilizers and substances providing plants with oligo-elements, said granular product being characterized in that said layers essentially consist of
- a. from about 90 to 99%, calculated on the weight of said coating, of particles of a solid material having an average main diameter not exceeding 0.2mm of which at least 25%, calculated on the weight of the coating, consist of a material soluble in water without decomposition in the ratio of at least 1 gram of substance for 50 grams of water and
- b. from about 1 to 10%, calculated on the weight of said coating, of a water-insoluble, solid, plastified or nonplastified, non-cured resin, said granular product being non-dusty and non-hygroscopic but releasing the active materials of the coating and of the nucleus, without any delay as soon as said product is brought into contact with the moisture of the soil.
Dependencies are inferred from the claim text.