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The utilization of surplus straw has formed an actual problem in Finland during the last years. In addition to the ploughing in of straw with nitrogen fertilizers or the use of straw as litter in larger quantities, fermenting of straw in composts has been recommended. The latter method contains, however, several technical weak points, the most important of which seems to be the insufficient moistening of raw straw that leads to an unequal, slow and incomplete humification of the material. Recently two humifying preparations have been obtainable even in Finland: the bacterial preparation »Fertosan» and the possibly biodynamic preparation »QR». According to the advertisements, both of them are able to accelerate the decomposition of organic material in such a degree that even straw turns into good humus within six weeks. It is stated that this occurs without any application of nitrogen or other mineral nutrients, and that it is due only to the very effective bacteria in »Fertosan» or the substances in »QR» which are claimed to activate the microbial processes to an enormous degree. In order to investigate the value of these preparations some experiments were performed both under laboratory conditions and on a larger scale. The effect of these preparations upon humification of rye straw was compared with that of an usual application of nitrogen and phosphorus fertilizers.

Observations on the effect of „Fertosan“- and „QR“- preparations upon the humification of straw