ENGRAIS COMPLEXE EN BASE D'AZOTE-PHOSPHATE POTASSIUM ET PROCEDE D'OBTENTION

摘要

The present invention relates to NPK-fertilizer manufactured during application of KCl and/or K2SO4 as potassium source and which also contains magnesium in an amount of 0.2-3.0% calculated as MgO and added in the product as MgO, and method for manufacture of this product. The special features of the method is that to an evaporated nitrogen, phosphorous solution 0.2-3.0% reactive MgO and potassium salts are added before prilling or before/during granulation. MgO is preferably added as lightly calcined MgO having an average particle size of 0.2-3.0 mm, and is added in the mixer just before the prilling means. The new product has reduced tendency to swelling and caking.