An Evaluation of the Minus-One Design for Field Experimentation with Fertilizers

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Date
1962
Authors
Evans A. C.
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Abstract
Using the formula given by Cochran and Cox (1950), and the following assumption test of significance, 5 per cent level, probability 90 per cent the value of (t1 + t2)*can be determined for the 13 degrees of freedom available for error, assuming the experiment to be planted in four blocks as is usual, The value so determined is 3.12. On the above assumption and with three replications of the six treatments in the minus-one design the value of (tt + to) for 10 degrees of freedom is 3.18. Although the difference is negligible, the saving in number of plots is however considerable, a reduction of nearly 50 per cent. Thus it would appear that the minus-one design is satisfactory for exploratory fertilizer experiments. • (t1 + t2) is a modified value of t and is dependent on the level of significance and probability required.
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East African Agricultural And Forestry Journal, XXVII (No. 3), p. 164-167
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