An improved fertilizer composition is disclosed, including particles of a sparingly soluble fertilizer source having porous outer surfaces (for example, IBDU.RTM.) which have been coated with a hard outer coating that substantially covers the surface of each of the particles and substantially fills the pores in the surface of each of the particles. The particles are thereby hardened by the coating and are given increased resistance to abrasion and dust formation. The hardened outer coating is preferably formed when a liquid binder (which preferably includes a mixture of urea and a lignosulfonate) is sprayed onto the particles and then allowed to harden or cure. A process for making such hardened fertilizer particles is also disclosed.
A process for preventing the formation of dust during the loading of sulfate fertilizer granulates includes spraying a high-percent aqueous solution of urea onto the fertilizer granulates. The amount of aqueous solution sprayed ranges from 4 to 8 kg of solution per ton of granulate. The concentration of urea within the solution is between 50% and 80% by weight.
This invention relates to a compression molded tablet fertilizer, possessing an ability to release slowly the active ingredients thereof suited to horticulture and afforestation, excelling in moldability, and revealing only sparing inconstancy of distribution of fertilizer components. The compression molded fertilizer comprises particulate fertilizer ingredients and 0.01 to 8% by weight of inorganic salt of lignin sulfonic acid and 0.01 to 0.8% by weight of inorganic salt of stearic acid both based on the amount of the particulate fertilizer ingredients. A method for the production of the compression molded tablet fertilizer is also disclosed.
A soil improver composition produced by digesting a mixture comprising leguminous plant material, igneous rock powder of particle size less than 350 microns, a biodegradable surfactant and water with composting microbes to produce said soil improver composition.
A method of forming a methylol urea prepolymer and a particle coated in with the prepolymer. The method involves providing a source of methylol urea and a source of aldehyde and reacting the urea and the aldehyde in the presence of an excess of urea to form the methylol urea prepolymer. The coated particle is preferably a controlled-release fertilizer particle. The particle is a substrate coated with a substantially uniform coating comprising a total nitrogen content ranging from about 39N to about 42N. The coating includes a low molecular weight methylene urea compounds.
