초록 ▼

A controlled release particulate fertilizer composition containing nitrogen in a form which is slowly released and a water soluble solid additive, such as a phosphorus or potassium nutrient salt, in a form which is quickly released comprising a core of a water soluble nitrogen nutrient source, a coa

A controlled release particulate fertilizer composition containing nitrogen in a form which is slowly released and a water soluble solid additive, such as a phosphorus or potassium nutrient salt, in a form which is quickly released comprising a core of a water soluble nitrogen nutrient source, a coating of sulfur surrounding the core, and a coating surrounding the sulfur coating of an inert water-insoluble material such as wax. The inert coating comprises an inner portion of the inert coating alone and an outer portion containing the salt or other water soluble additive.

대표청구항 ▼

A controlled release fertilizer composition in particulate form, each of said particles comprising nitrogen in a form which is slowly released and an inorganic water soluble additive in a form which is quickly released, each of said particles comprising a core of water soluble nitrogen nutrient sour

A controlled release fertilizer composition in particulate form, each of said particles comprising nitrogen in a form which is slowly released and an inorganic water soluble additive in a form which is quickly released, each of said particles comprising a core of water soluble nitrogen nutrient source, a coating of sulfur surrounding said core, and a coating surrounding said sulfur coating of wax, said coating comprising an inner portion free of water soluble additives and an outer water soluble additive-containing portion, the inner portion completely covering said sulfur coating and forming a water barrier separating said outer portion from said sulfur coating, the outer portion containing embedded therein particles of at least one inorganic water soluble solid additive of from 325 to 30 mesh size, the ratio by weight of the solid additive to the total weight of said wax being less than 8.