Abstract: Acidic fertilizer granules, methods for producing the same, and methods for their use in fertigation, are disclosed. The acidic fertilizer granule can contain 1 wt. % to 45 wt. % of nitrogen; 1 wt. % to 45 wt. % of phosphorus; 1 wt. % to 45 wt. % of potassium; 0.1 wt. % to 20 wt. % of sulfur; and 1 wt. % to 45 wt. % of chlorine, wherein the granule contains an effective amount of an inorganic acid sufficient to form a solution having a pH of less than 4 when 10 grams of the fertilizer granule(s) is dissolved in 100 ml of water having a pH of 7 before the fertilizer granule(s) is dissolved in the water.

Abstract: Methods for producing solid acidic fertilizer granules, solid acidic fertilizer granules, and methods for their use in fertigation, are disclosed. The method can include providing a plant nutrient containing nitrogen (N), phosphorus (P) and optionally potassium (K), in a container; feeding an acid solution containing an inorganic acid into the container at a feeding rate comprising an average feed rate of 0.2 to 0.8 metric ton of the inorganic acid (MTacid) per hour per metric ton of the plant nutrient (MTnutrient) (MT acid.h?1.MT nutrient?1) and contacting the inorganic acid and the plant nutrient to obtain acidified granules with average moisture content of 0.5 wt. % to 1.0 wt. %; and drying the acidified granules to obtained dried acidic granules.

Abstract: Disclosed herein is a fertilizer composition including a plant nutrient comprising a phosphorus compound; and an inorganic acidic compound free of phosphorus. The fertiliser composition can also comprise a fertilizer granule and a coating disposed on the fertilizer granule wherein the fertilizer granule comprises a plant nutrient; and the coating comprises sulfuric acid, nitric acid, hydrochloric acid, or a combination. The plant nutrient comprises a phosphorus compound. The fertilizer composition is useful in fertigation.

Abstract: A fertilizer composition comprises an inorganic fertilizer particle, a first layer disposed on the inorganic fertilizer particle, and a second layer disposed on the first layer wherein the first layer comprises biomaterial and the second layer comprises phosphoric acid, ammonium polyphosphate, or a combination comprising at least one of the foregoing. A method of making the fertilizer composition is also described herein.

Abstract: A fertilizer composition comprises an inorganic fertilizer particle, a first layer disposed on the inorganic fertilizer particle, and a second layer disposed on the first layer wherein the first layer comprises biomaterial and the second layer comprises phosphoric acid, ammonium polyphosphate, or a combination comprising at least one of the foregoing. A method of making the fertilizer composition is also described herein.