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Abstract: When one is operating a regular filling schedule it is often the weekly production figure which gives the first indication that! something is wrong. As Teichnical;, Director of Noble Mushrooms Ltd. it is one of my duties to attempt to provide an explanation when output is below average. I gradually came to realise that the demand for these explanations frequently came towards the end of the year. Were our yields invariably low at this time? I looked into our crop records for 1952-3-4, and found an unmistakable pattern repeated. Why, I wondered, should we during the years 1952/4 get our best crops from houses which came into crop in May/June and our worst around the end of the year? Why this steep rise in production early in the year, and the subsequent steady decline? Nature? If so, what aspect of Nature? I thought about the temperature and the rainfall. It seemed wise to confine my study initially to one year, and I chose 1953 because it was uneventful, with little obvious disease, few experiments, and no trouble with our spawns ; the known variants were thereby minimised.
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