Uniformity trial in raya (Brassica juncea)
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Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
A uniformity trial for determination of optimum size and shape of plots and blocks, optimum
number of replications and to compare relative efficiency of various designs was conducted on Indian
mustard (raya) on a field of size 48m × 48m. The total area divided into 2304 units each unit have size of
1m × 1m.
Based on coefficient of variation, the plots elongated in the E-W direction were more beneficial in
controlling the soil heterogeneity and the long and narrow plots elongated in E-W direction were more
useful than the compact and square plots. The blocks elongated in E-W direction were more effective in
reducing error variation. The coefficient of variation decreases with the increase in the block size, thus
larger blocks were found to be more efficient than smaller ones. In general, blocks were found to be more
efficient than without blocking arrangement.
The optimum plot sizes were estimated to be 5 m
2
for without blocking and 2 m
2
or 3 m
2
for with
blocking using the maximum curvature method and Smith’s method. The number of replications required
for detecting the true difference between the treatment means for a given level of accuracy decreased with
the 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. Split plot design was found to
be more efficient than RBD where the experimenter was interested to have more precision in sub
treatments and interaction comparisons than main treatments. In case of factorial experiments, the
confounding resulted in gain of efficiency.
Description
Keywords
Developmental stages, Crops, Fruits, Biological phenomena, Diseases, Acidity, Antioxidants, Planting, Vitamins, Aromatic compounds