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Abstract: The purpose of experiments was to investigate: 1) Whether larger quantities! of the inorganic chemicals used in previous experiments (1, 2, 3, 4) and found to increase the yields considerably would show even higher yields or their having a toxic effect. 2) Whether the short method of composting (5,6) would produce higher yields either in total or in a shorter time than by the ordinary method of composting (14 - 16 days) and with the supplements now generally used in Denmark (1,2). 3) Whether it was possible to detect any difference in yields after the short method of composting when the chemicals generally used in Denmark were added. 4) Whether brewers grains compost as tested previously (3) "would produce yields equal to M.R.A. compost (7) when increasing amounts of the nitrogen sources used in the M.R.A. were added. 5) Whether any of the synthetic composts tested would give yields equal to either pig - or horsemanure. 6) Whether there was any difference in yields between growing on shelves or in trays, and. 7) Whether the influence of peak-heating of the different treatments was still present. Before starting the composting a turning schedule was planned. This is given in table 2 together with the figures on the actual results of composting.
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