In situations where yield is variable but in which it is not desirable to take too large a cut sample, e.g. on grazed plots, the pasture‐yield estimator can be used to improve the accuracy of yield estimation. An outline of the theory and examples of the use of the method are given.
A model of the electronic instrument described by Campbell et al. (3) was built at the Grassland Research Institute and was found to behave in a very similar way to their New Zealand model. A considerable amount of field work was undertaken with it in 1964 and this demonstrated that no general relationship of acceptable accuracy had yet been found; nor could it be sufficiently improved by the inclusion of the meteorological and botanical factors recorded. This forces one to a consideration of double‐sampling techniques, which appear worth while; they will be discussed in Part 2 of this paper.
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