Uniformity trials with cotton
1935
Siao, F.
1. Increase in size of plat was accompanied by reduction in experimental error, but larger plats were lower in efficiency than the smaller plats. This indicated that increase in number of replications was much more efficient than increasing the size of plat. 2. The shape of the plat was determined by the direction of soil variation. The increase in size of plat in the direction of least association was most efficient. 3. Because of high seasonal variation no definite number of replications could be recommended. Each of the three methods of replication, viz., systematic arrangement, randomized blocks, and Latin squares, were studied and differences between hypothetical varieties compared with calculated standard errors. By means of X2 for goodness of fit each gave good agreement with mathematical expectation.
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