Abstract
Two methodologies are proposed to determine the most efficient plotsize for tree crops using data from experiments based on randomized completeblock designs. Both methods can be generalized for data from anybalanced design. The merits and demerits of these methods are discussed.The methods are illustrated using the data sets of long-term field experimentsat the Coconut Research Institute, Sri Lanka. The results show thatefficient plot size in field experiments for coconut for a wide range of agroecologicalregions is four or six palms.
Highlights
In field experiments the efficient testing of the treatment effects de pends upon the experimental precision
Abeysinghe (1986) recommended that a plot size of four palms could be used for completely randomized design (CRD) experiments if the two year pooled pre-experimental yield can be used as a covariate in the analysis
The study showed that the two methods proposed in this paper are suitable to determine the optimum plot size for any tree crop
Summary
Two methodologies are proposed to determine the most efficient plot size for tree crops using data from experiments based on randomized com plete block designs. Both methods can be generalized for data from any balanced design. The merits and demerits of these methods are discussed. The methods are illustrated using the data sets of long-term field experi ments at the Coconut Research Institute, Sri Lanka. The results show that efficient plot size in field experiments for coconut for a wide range of agroecological regions is four or six palms
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