| 摘要 |
A water insoluble micronutrient fertilizer, methods of producing, and methods of using the same are provided. The fertilizer may comprise at least one first micronutrient selected from the group consisting of chromium, cobalt, copper, iron, manganese, and zinc; a polyphosphate; and optionally at least one second micronutrient selected from the group consisting of boron, chlorine, iodine, molybdenum or selenium. The fertilizer compounds are preferably water insoluble, dilute acid soluble, and free-flowing powders |
| 主权项 |
1. A method of producing a fertilizer comprising:
a. combining at least one lesser reactive metal compound, phosphoric acid optionally heated, and optionally sulfuric acid and optionally water, and optionally at least a first secondary micronutrient to form a first mixture; b. heating the first mixture to a temperature between about 90° C. and about 165° C.; c. optionally combining at least one higher reactive metal compound, and optionally secondary micronutrients and optionally water, to the first mixture to form a second mixture; d. heating the second mixture to a temperature between about 90° C. and about 165° C.; e. optionally combining at least one higher reactive metal compound, and optionally at least a second secondary micronutrient and optionally water, to the second mixture to form a third mixture; f. heating the third mixture to between about 90° C. and about 165° C.; and g. discontinuing the step of heating the third mixture to between about 100° C. and about 140° C. when the third mixture is soluble in 2 wt. % citric acid. |
