The invention provides a method for obtaining a granulated phosphate fertiliser, as a phosphorus source, for direct use in agriculture, from the natural raw materials phosphate rock, a carbon source, a metabolic inducer of phosphorus-solubilising microorganisms and water.

In one aspect, a multi-layered fertilizer includes a layer-by-layer coated fertilizer layer and a coating layer, wherein the fertilizer layer is separated from the coating layer, and one of the fertilizer layers is a fertilizer core; the fertilizer layer contains at least one of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer, the coating layer is polyurea formaldehyde, which includes at least a polyurea formaldehyde having two to five carbon atoms. It can better control the release of nitrogen, phosphorus, potassium, calcium, magnesium and zinc in the fertilizer to meet the different nutrient requirements of different crops at different growth stages. The fertilizer can be prepared by a reactor, a slurry tank, a powdering tank and supporting facilities, which can control the amount of each layer of fertilizer and its position in the entire fertilizer granules according to a design procedure.

In one aspect, a multi-layered fertilizer includes a layer-by-layer coated fertilizer layer and a coating layer, wherein the fertilizer layer is separated from the coating layer, and one of the fertilizer layers is a fertilizer core; the fertilizer layer contains at least one of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer, the coating layer is polyurea formaldehyde, which includes at least a polyurea formaldehyde having two to five carbon atoms. It can better control the release of nitrogen, phosphorus, potassium, calcium, magnesium and zinc in the fertilizer to meet the different nutrient requirements of different crops at different growth stages. The fertilizer can be prepared by a reactor, a slurry tank, a powdering tank and supporting facilities, which can control the amount of each layer of fertilizer and its position in the entire fertilizer granules according to a design procedure.

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.

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.

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.

According to some embodiments, there is provided herein a granule comprising polyhalite and phosphate rock, in a ratio of between 30:70 to 70:30, respectively.

Soil treatment compositions, products, systems, kits, and methods, for increasing the amount, level, ratio, or proportion of soluble and/or bioavailable phosphorus in soil, for solubilizing phosphorus, for enhancing or improving bioavailability of phosphorus in soil, for improving soil fertility, for increasing crop production, for reducing phosphorus fertilizer requirements, and so forth. Bioactivated fertilizer compositions and related methods for increasing phosphorus solubility and/or bioavailability in soil.

Soil treatment compositions, products, systems, kits, and methods, for increasing the amount, level, ratio, or proportion of soluble and/or bioavailable phosphorus in soil, for solubilizing phosphorus, for enhancing or improving bioavailability of phosphorus in soil, for improving soil fertility, for increasing crop production, for reducing phosphorus fertilizer requirements, and so forth. Bioactivated fertilizer compositions and related methods for increasing phosphorus solubility and/or bioavailability in soil.

The present invention refers to an industrial process for obtaining an agricultural composition formed by association of one or more species of Bacillus spp., of Lactobacillus spp. and of Pseudomonas, the process for induction of exudates/metabolites, as well as the application thereof in the manufacture and in the increase of the efficiency of phosphate fertilizers of mineral, organomineral and organic origin. Surprisingly, the agricultural composition used in the fertilization industry increases the availability of macro and micronutrients to the plants with agricultural interest, such as soy and corn. Finally, both the use of the agricultural composition in the fertilizers industry as the application of the product in the field potentialize the greater availability of essential nutrients for the development of the cultures.