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Abstract: Ihe growth of mushrooms can be divided into a number of stages, from growth of mycelium up to the final cessation of fruiting. Cropping records have been used to study the effect of nutritional factors on some of these stages considered separately, particularly the start of fruiting, and the number and size of mushrooms produced, with some observations on the occurrence of flushes and the duration of fruiting. The number of mushrooms produced from any particular compost, cither during its whole productive life, in a shorter time, or m a single ilush, may be affected by quite a wide range of conditions which do not alter the compost itself A strong tendency has been observed for any such variation m number of mushrooms, due to what may be called physical causes, to be associated with an opposite variation m the average weight per mushroom Examples of such causes are differences between top, middle, and bottom shelves m the cropping house time of casing the beds, distance apart of pieces of spawn, and successive flushes from a group of beds of the same compost Another example is the effect of gypsum added to the compost which increased the number of mushrooms and reduced their size Gypsum is considered to have mainly a physical effect on the compost and to improve the growth of spawn
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