Zinc-ammonium phosphate fertilizers
AssigneeIncitec Limited
InventorsAnthony Martin Brown, Thomas Welsh, Christopher Wallace Dowling
Life of this patent
Estimating the term…
Abstract
A process of obtaining a co-granulate of zinc and ammonium phosphate having a N/P ratio of 0.6-1.9 which includes initially feeding ammonium phosphate in finely divided form with a zinc source such as zinc oxide or zinc sulphate into a granulator wherein ammonia may also be fed into the granulator to increase the N/P ratio. The co-granulate is then obtained after drying.
Claims27
A process for making a co-granulate said co-granulate consisting of a zinc source and ammonium phosphate, said consulate providing a zinc uptake in soil and plants of at least 70-80% of the zinc uptake provided by application of an equivalent amount of zinc in the form of zinc sulfate said process comprising the steps of:
- (i) adding solid ammonium phosphate having an N/P ratio of 0.6-1.9 and said zinc source in the form of a slurry, suspension or particles to a granulator vessel to form said co-granulate;
- and
- (ii) drying the co-granulate.
A co-granulate of zinc source and ammonium phosphate having an N/P ratio of 0.6-1.9 which produces a zinc uptake in soil and plants of at least 70-80% of the zinc uptake provided by application of an equivalent amount of zinc in the form of zinc sulfate.
A method for using a zinc ammonium fertilizer, said fertilizer consisting a co-granulate zinc source and ammonium phosphate having an N/P ratio of 0.6-1.9 which produces a zinc uptake in soil and plants of at least 70-80% of the zinc uptake provided by an application of an equivalent amount of zinc in the form of zinc sulfate wherein said method comprises:
- applying said fertilizer to soil and/or plants at an application rate within the range 1-10 kgha−1 Zn.
A process for making a co-granulate comprising a zinc source and ammonium phosphate, said co-granulate providing a zinc uptake in soil and plants of at least 70-80% of the zinc uptake provided by application of an equivalent amount of zinc in the form of zinc sulfate said process comprising the steps of:
- (i). Mixing solid ammonium phosphate having an N/P ratio of 0.6-1.9 and said zinc source in the form of a slurry, suspension or particles in a granulator vessel to form said co-granulate;
- and
- (ii). Drying said co-granulate.
Dependencies are inferred from the claim text.