Estimation of optimum plot size, shape and number of replications in sunflower (Helianthus annuus)
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Date
2015
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Publisher
CCSHAU
Abstract
A study of uniformity trial for the determination of optimum size and shape of plots and blocks,
optimumnumber of replications and to compare relative efficiency of various designs was
conducted on sunflower on a field of size 35m × 40m which after eliminating border effects
reduced to 32 m x 36 m. The total area divided into 1152 units each unit have size of1m × 1m.
Based on coefficient of variation, the plots elongated in E-W direction were more
effective in reducing error variation than those elongated in N-S direction. Also the blocks
elongated in N-S direction were more effective in reducing error variation than those elongated in
E-W direction. The coefficient of variation decreases with the increase in the block size,
thuslarger blocks were found to be more efficient than smaller ones. In general, blocks were
found to be moreefficient than without blocking arrangement.
The optimum plot sizes were estimated to be 2 m2 for without blocking and 2 m2 or 1
m2 for withblocking using the maximum curvature method and Smith’s method. The number of
replications requiredfor detecting the true difference between the treatment means for a given
level of accuracy decreased withthe increase in the plot size.
It was found that randomized block design (RBD) was more efficient in reducing error
variation over completely randomized design (CRD). Latin square design (LSD) was found to be
more advantageous over CRD and over RBD only when the columns were considered as blocks.
In case of factorial experiments, the confounding resulted in gain of efficiency.
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Keywords
Costs, Manpower, Productivity, Tillage equipment, Diseases, area, Crops, Economics, Biological development, biological phenomena