Two field experiments were conducted at the Agricultural
Research and Experiment Center, Faculty of Agriculture
at l4oshtohor, Kalubia, Egypt, during 1986 and 1987 seasons.
The aim of the investigation was to study the response
of three maize varieties to soaking their grains in solution
of two growth regulators (GA3 and ،AA) at three concentra
tiona, i.e. 40, 80 and 120 ppm for 12 hours.
S.C. 103 surpassed the other two varieties in plant
height, ear diameter, number of grains/row, ear weight.
weight of grains/ear, T.W.C. 310 gave higher ear position
and higher shelling percentage, but D.C. 202 produced higher
number of rows/ear. The three varieties were similar for
stem diameter, number of green leaves/plant after 90 days
from sowing, ear length, number of grains/ear, number of
ears/plant and 100—grain weight.
Soaking maize grains in GA3 or ،AA under different
concentrations decreased stem diameter and number of green
leaves/plant as compared with the control treatment. GA3
at 40 ppm increased plant height and 100—grain weight and
gave the lowest grain weight/plant, but ،AA at 120 pp
produced the highest values of ear and grain weight/plant.
،AA at 40 ppm decreased number of grains/row as compared
with 80 ppm of both ،AA and GA3. Number of rows/ear increased
by GA3 at 80 ppm as compared with 40 ppm. The highest number
of grains/ear was obtained by GA3 at 80 ppm and the lowest
number was produced by ،AA at 40 ppm. Both growth regulators
did not affect ear length, ear diameter, ear weight, grain
weight/ear, number of ears/plant, shelling percentage,
yield of ears and grain/fed.
Positive correlation coefficient was obtained between
grain yield and each of yield of ear, number of grains/row,
number of grains/ear, ear diameter and ear length.
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