UNIFORMITY TRIAL ON GROUNDNUT
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Date
1992
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Abstract
The concept of optimum plot size in field
experiments has received a serious consideration in
recent years. The plant breeders have to test large
number of varieties and hence like to have optimum plot
size so that they can incorporate as many varieties as
possible in a single experiment. On the other hand,
agronomists might like to try some treatments which are
also limited in supply and hence they cannot afford to
have plot size more than what is necessary. Further
more, the experimental results based on very small
plots do not give reliable estimate of treatment
responses and hence recourse to the optimum plot size.
A uniformity trial on groundnut was conducted
as no such information about optimum plot size and plot
shape was available in India and as groundnut occupies
a pride of place among oil seed crops of India. The
trial was conducted during kharif 1991 in Student's
Farm, College of Agriculture, Andhra Pradesh
Agricultural University, Rajendranagar, Hyderabad. The
test variety of groundnut was TMV2, a spanish bunch
variety and a popular cultivar of the region.
The results indicated that experimental field
of uniformity trial was having uniform soil fertility
gradient in general. Yields were following normal
distribution based on the values of coefficients of
skewness and Kurtosis both row-wise and column-wise. As
the area of plot size was increased, the coefficient of
variation decreased slowly. The value of 'b' was
-0.0524, which is close to zero whic:. indicated that
i·~ere was high degree of correlation among plots with
Lespect to soil fertility gr,dient. The optimum plot
size was determined as 7.2 m (20 x 0.36) using maximum
curvature method.
Blocking was efficient with rectangular plots,
when the plots within the block were arranged
perpendicular to the longer side of the plot. Among the
rectangular plots,blocking was more efficient with the
blocks having longer side across the crop rows. Block
shape of 3:3 arrangement with 9 plots per block was
found to be six times more efficient than without
blocking.
The growth characters such as number of leaves
per plant (X 2 ) and height of the plant (X 3 ) were found
to be significantly and positively correlaeed with pod
weight (Y) in most of the stages of the crop growth.
Number of leaves per plant (x2 ) and height of plant
(X 3 ) were found to be significantly influencing pod
weight (Y) in all the stages of the crop growth as was
evidenced from significant partial regression
coefficients values in multiple regression analysis
except at stage 6 (90th day).
Number of branches per plant (X) was having
highest negative direct effect on pod w~ight whereas
number of leaves per plant (X) and height of the plant
(X 3 ) were having positive direct effect on pod weight.
Number of branches per plant and number of leaves per
plant were effecting pod weight indirectly through
height of the plant.
Description
UNIFORMITY TRIAL ON GROUNDNUT
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