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Abstract: Mushroom composts were sampled and analysed (1, 2) in order to follow the changes taking place during composting and cropping. Sampling at three stages was undertaken as follows: 1. At the first turn of composting. 2. When filling the cropping beds. 3. When emptying exhausted compost from the beds. In addition samples were sometimes taken during the cropping | period by means of a core sampling instrument. Moisture, total nitrogen, pH, total ash, acid insoluble ash, calcium, magnesium, phosphorus, potassium and oxalate3 determinations were then made as desired.
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