Suspension fertilizer suitable for irrigation fertilization, and a process for its preparation
AssigneeKemira Agro Oy
InventorsHannu Aijala, Thomas Ahlnas
Life of this patent
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Abstract
The invention relates to a stable aqueous fertilizer suspension suitable for drip irrigation, which suspension contains 5-55% by weight water and 45-95% by weight of one or several plant-nutrient containing substances, of which at least one contains water-insoluble solid particles, the particle size of the solid particles contained in the suspension being less than 50 .mu.m and the pH of the suspension being within the range 2-7. The invention also relates to a process for the preparation of this suspension.
Claims12
A stable aqueous fertilizer suspension suitable for drip irrigation, consisting essentially of:
- (i) 5-55% by weight water;
- and
- (ii) 45-95% by weight of one or more plant-nutrient containing substance, wherein:
- said one or more plant-nutrient containing substance is based on at least one cation selected from a group consisting of NH.sub.4.sup.+, K.sup.+, Ca.sup.2+ and Mg.sup.2+ ;
- on at least one anion selected from a group consisting of NO.sub.3.sup.-, Cl.sup.-, SO.sub.4.sup.2-, phosphates and polyphosphates;
- on urea;
- or on a combination thereof;
- and
- said one or more plant-nutrient containing substance contains water-insoluble solid particles, having a particle size of less than 50 .mu.m, and the suspension having a pH within the range of 2 to less than 7.
A process for preparing an aqueous fertilizer suspension consisting essentially of:
- (i) mixing one or more plant-nutrient containing substance with water to form a suspension containing water-insoluble solid particles;
- (ii) adding a sufficient amount of an acid or a base to adjust the pH of the suspension to a value within the range 2-7;
- (iii) when necessary, milling the suspension to adjust the particle size of the solid particles to, in the main, within the range 100-1000 .mu.m;
- and
- (iv) further milling the suspension in a pearl mill to form a suspension in which the particle size of the solid particles is less than 50 .mu.m;
- wherein said suspension consists essentially of:
- (i) 5-55% by weight water;
- and
- (ii) 45-95% by weight of one or more plant-nutrient containing substance, wherein:
- said one or more plant-nutrient containing substance is based on at least one cation selected from a group consisting of NH.sub.4.sup.+, K.sup.+, Ca.sup.2+ and Mg.sup.2+ ;
- on at least one anion selected from a group consisting of NO.sub.3.sup.-, Cl.sup.-, SO.sub.4.sup.2-, phosphates and polyphosphates;
- on urea;
- or on a combination thereof;
- and
- said one or more plant-nutrient containing substance contains water-insoluble solid particles, having a particle size of less than 50 .mu.m, and the suspension having a pH within the range 2-7.
Dependencies are inferred from the claim text.