The analysis of crop rotatioin experiments presents a number of problems which are not encountered in the analysis of annual experiments. Some of these problems have been discussed in a general account of long-term experiments by Cochran [1939]. More recently methods of analysing two types of rotation experiment have been considered in greater detail. These two types are: (a) experiments comparing the effects of different treatments on the crops of a fixed rotation, and (b) experiments comparing the effects of different rotations. The analysis of experiments of type (b) has been considered by Yates [1954]. Some points arising in the analysis of replicated experiments of type (a) have been discussed by Patterson [1953]. The present paper deals with the analysis of an experiment of type (a) in which the treatments were not replicated in each year, and which consequently gives rise to a number of problems which were only briefly considered by Patterson [1953]. The discussion should be of some general interest as non-replication is likely to be a feature of many rotation experiments.

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