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Abstract: Mushroom cropping experiments provide the statistician with a number of problems which are not usually present in experiments with other crops Yields from similarly treated trays are often markedly different, and it is important to identify sources of variation other than the experimental treatments in order that they may be eliminated, or, if this is not possible, allowed for in the experimental design The identification of sources of variability is of course of interest not only to the statistician, but also to the grower If patterns of variability can be identified with physical factors in the environment, it is often possible to adjust the environment so that optimum conditions are achieved over a larger area. The first published investigation of variability in mushroom cropping experiments is that of LAMBERT (1934), who studied patterns of variability m three cropping houses and made recommendations concerning plot size and the use of replication. LAMBERT'S recommendations were discussed and extended by COOKE and FLEGG (1963) in a paper which gives much sound advice on the conduct of yield experiments with mushrooms. The mam purpose of the experiments described in the present paper was to obtain information that would enable effective use to be made of threedimensional experimental designs. In addition, some results of a more practical nature were obtained.
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