Abstract: The present invention relates to a fertilizer in granular form comprising within the same granule a mixture of: (A) From 15 to 85 wt % of a potassium sulfate; and (B) From 85 to 15 wt % of at least one salt that is different from (A) and that provides potassium and/or magnesium and/or calcium and/or sulfate; wherein the fertilizer in granular form has—a potassium level (expressed as K2O) of at least 18 wt %, preferably at least 20 wt %;—a chloride level of at most 10 wt %, preferably at most 5 wt %, more preferably at most 3 wt %;—a magnesium level (expressed as MgO) of at most 10 wt %, preferably at most 9.5 wt %. Materials of the invention are free flowing & combine a good nutrient balance with a good hardness and wear resistance.

Abstract: Method for producing soluble potassium sulfate by recrystallization of crude potassium sulfate wherein the crude potassium sulfate contains an amount of potassium, calculated as K2O, of about 15 wt % or higher, and the resulting potassium sulfate crystalline material conforms with the following characteristics: the amount of insoluble material is less than about 0.05 wt %, a 1 wt % solution of the potassium sulfate has a pH below about 6, and/or 1 pH unit lower than the pH of the crude potassium sulfate, the fraction obtained after crystallization has an average particle size within the following parameters: (i) d90<about 0.6 mm, (ii) d10>about 0.02 mm, and (iii) dust amounts to about 0.4 wt % or less, whereby the resulting potassium sulfate contains more than 51% potassium, calculated as K2O.

Abstract: The invention relates to a method for producing for producing soluble potassium sulfate by recrystallization of crude potassium sulfate wherein the crude potassium sulfate contains an amount of potassium, calculated as K2O of about 15 wt % or higher preferably about 40 wt % or higher and has either more than about 0.07 wt % insoluble material, and/or a dissolution speed wherein at 3 min dissolution of 100 gram product in 1 L cold water (20° C.

Abstract: The invention relates to a potassium sulphate powder wherein about 80 wt % or more of the powder has a particle size of about 0.2 mm or lower, preferably about 0.13 mm or less. The particle size preferably is such, that about 80 wt % or more is about 0.02 mm or higher, more preferably about 0.04 mm or higher. This potassium sulphate powder dissolves easily in water, more in particular, 50 gram of said potassium sulphate powder dissolves in 1 liter of water without stirring within 1 minute, preferably within 30 sec. This potassium sulphate powder is very suitable as foliar fertilizer, in particular for broad acre crops. Further, the invention relates to the use of foliar potassium fertilizer, to enhance the uptake of potassium from the soil.

Abstract: The invention relates to a potassium sulphate powder wherein about 80 wt % or more of the powder has a particle size of about 0.2 mm or lower, preferably about 0.13 mm or less. The particle size preferably is such, that about 80 wt % or more is about 0.02 mm or higher, more preferably about 0.04 mm or higher. This potassium sulphate powder dissolves easily in water, more in particular, 50 gram of said potassium sulphate powder dissolves in 1 litre of water without stirring within 1 minute, preferably within 30 sec. This potassium sulphate powder is very suitable as foliar fertilizer, in particular for broad acre crops. Further, the invention relates to the use of foliar potassium fertilizer, to enhance the uptake of potassium from the soil.