Abstract: The present application relates to a combined NPK-Si fertilizer product comprising a mineral NPK fertilizer, which comprises at least one nutrient compound of nitrogen, phosphorous or potassium, and a particulate amorphous silicon dioxide, wherein the ratio of the mineral NPK fertilizer to the amorphous silicon dioxide is from 10:90 to 90:10, based on the dry weight of the at least one nutrient compound of nitrogen, phosphorous or potassium, and the amorphous silicon dioxide contained in the product. The application also relates to the method of production of the inventive NPK-Si fertilizer.

Abstract: A combined organomineral NPK—Si-humate fertilizer having at least one particulate mineral NPK fertilizer is provided, which has at least one nutrient compound of nitrogen, phosphorous or potassium; and a particulate humic substance based silicon fertilizer, having chelates of monosilicic acid-humate compounds. The application also relates to a method of production of the combined organomineral NPK—Si-humate fertilizer.

Abstract: The present invention relates to a humic substance based Si-fertilizer product having storage-stable, bio-available Si, which is produced by forming a mixture of, 45-95% by weight of a humic acid-containing raw material, 5-50% by weight of amorphous silica, and 0.5-10 % by weight of an alkali, all amounts based on the total weight of the dry components, incubated in an aqueous medium, and optionally dried and granulated, wherein the bio-available silicon is in the form of water-soluble chelates of monosilicic acid-humate compounds. The invention also relates to a method of producing humic substance based Si-fertilizer, a method for increasing the uptake of silicon in plants and use of the humic substance based Si-fertilizer.

Abstract: The present application relates to a combined NPK-Si fertilizer product comprising a mineral NPK fertilizer, which comprises at least one nutrient compound of nitrogen, phosphorous or potassium, and a particulate amorphous silicon dioxide, wherein the ratio of the mineral NPK fertilizer to the amorphous silicon dioxide is from 10:90 to 90:10, based on the dry weight of the at least one nutrient compound of nitrogen, phosphorous or potassium, and the amorphous silicon dioxide contained in the product. The application also relates to the method of production of the inventive NPK-Si fertilizer.

Abstract: A combined organomineral NPK—Si-humate fertilizer having at least one particulate mineral NPK fertilizer is provided, which has at least one nutrient compound of nitrogen, phosphorous or potassium; and a particulate humic substance based silicon fertilizer, having chelates of monosilicic acid-humate compounds. The application also relates to a method of production of the combined organomineral NPK—Si-humate fertilizer.

Abstract: The present invention relates to a humic substance based Si-fertilizer product having storage-stable, bio-available Si, which is produced by forming a mixture of, 45-95% by weight of a humic acid-containing raw material, 5-50% by weight of amorphous silica, and 0.5-10 % by weight of an alkali, all amounts based on the total weight of the dry components, incubated in an aqueous medium, and optionally dried and granulated, wherein the bio-available silicon is in the form of water-soluble chelates of monosilicic acid-humate compounds. The invention also relates to a method of producing humic substance based Si-fertilizer, a method for increasing the uptake of silicon in plants and use of the humic substance based Si-fertilizer.