Abstract
Effects of raw brown coal ("Kohletrübe"), brown coal modified with ammonia water, NH3, ("Ammonkohle") andcomposted brown coal ("Biomineraldünger") on plant yield and on selected soil fertility characteristics of a colloidpoorand a coal-bearing dump soil are tested in a pot and field experiment. The results confirm already publishedresults. Therefore chemical modified nitrogen enriched brown coal is a humus fertilizer the influence of whichsustained the water and nutrient storing capacity as well as the nutrient transformation ability of colloid-poordump soils. Soil improving and yield increasing effects of coal fertilisation depend on particular conditions.
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