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Data taken from it uniformity trial on wheat were utilized to see the best possible plot size by making 1l.52 plots each of site 1.52x. 1.22 in. The plots of various sizes and shapes. were 'cons-tructed by pooling the yields of adjoining plots. The values of eoeffieient of variation (C, V_) decreased with the increase in plot size. The study also revealed that the plots of the 134inie 107.15 with length along the breadth of the aet.nal field gave leaser C.- V. than other types. A. plot size of 414.16 sq. m has bccn found to he more suitable as the declining trend of V. values becomes almost negligible for larger plotc Sample size and variance have been evaluated for different random sampling procedures. The method of stratified random sampling with optimum allooa-tion is considered as the most appropriate One.
INTRO DucTioN
It is of considerable importance for the research workers of TO saience to have ►doquate knowledge on plot technique. It in also importance to use the most efficient bhapes, sizes. and arrangemynts of plots in a particular experiment for obtainiig the reliable rtsults. The precision of sIgnificapee tests in field trials is largely controlled. by the Eli7.0 and shapo of an area available for the particular trial, the natur) of fertility or other variations and the availability of f and:1- Wheat is one of the major cereal orops cultivated over ai considerable area of Pakistan and is under constant and intensive research in the country. This problem 11.0•121 therefore been. selected so 450 to see a 8e-iCrktifiC: basis for using plot. shapes and sizes within 'optimum limits". The data collected from a uniformity tris,i have been analysed for the following objectives ;
Aftab-i-Islam, M. Ashfaq, M. Idrees Ahmed. (1984) Sizes and shapes of plots for field plot experiments on wheat uniformity trial data, Pakistan Journal of Agricultural Sciences, Volume 21, Issue 3,4.
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