Drying and storage of npk granular fertilisers based on superphosphate and containing urea as a plant nutrient

In an investigation of the properties of NPK fertilisers which contain urea as a plant food, the effects of free moisture, free acidity, urea content and temperature on their stability during storage have been studied. It is concluded that to ensure complete stability of NPK fertilisers (N 10, P 2 O 5 , 10, K, 2 O 18%) containing superphosphate and urea (2‐15%). Other conclusions are that ( a ) losses of nitrogen during storage are negligible,...