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Abstract: Since 1952, when the first experiments were conducted at the Danish Mushroom Research Station, a composting schedule of about 13-18 days (according to practical experience) has been used. This has since gradually developed into The 16-Day "Normal + 75%" Inactive Composting Process (1, 2, 3) and is now to a great extent—at least in Denmark—used by the skilled and successful mushroom growers. As the "Short Method of Composting" (4, 5), however, has a number of advantages, e.g. requires a minimum composting space, is labour-saving, is claimed to produce many square metres of bed space per ton of manure, and produces a high cropping yield when the right technique and organic supplements are used, it is widely applied among mushroom growers. It was decided to carry out cropping experiments with the two different composting methods, in each case using exactly the same kind of fresh manure. Over a period of about 3 years, 5 experiments have been carried out.
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