EFFECT OF PLANTING RATIOS AND NITROGEN LEVELS ON GROWTH, SEED YIELD AND QUALITY OF DHARWAD SORGHUM HYBRID-3 (Sorghum bicolor L. Moench)
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Date
1999
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University of Agricultural Sciences, Dharwad
Abstract
The field experiment with four planting ratios (female to male) viz., 2:1, 3:1, 2:2
and 4:2 and three nitrogen levels viz., 100,125 and 150 kg per hectare revealed that
the planting ratio did not significantly influence the plant height, leaf number and
leaf area of the parental lines of DSH-3 sorghum hybrid, where as, higher doses of
nitrogen increased the plant height, number of leaves and leaf area. The significant
reduction in 50 percent flowering with 150 kg N per ha was observed in both the
parental lines.
Higher hybrid seed yield was obtained with 2:1 planting ratio compared to
other planting ratios mainly due to increased ear length (23.7 cm), ear width
(4.0 cm), ear weight (33.2g ), number of seeds per ear (374), threshing percentage
(34.2), seed set(44.5%) and 1000 seed weight (11.48 g).
Increase in the nitrogen level from 100 to 150 kg N per ha increased hybrid
seed yield from 573.1 kg to 800 kg per ha and it is due to increased values for ear
length (22.6 to 23.3 cm), ear width (3.4 to 3.9 cm ), ear weight (30.0 to 32.1g),
number of seeds per ear (282.2 to 327.0 ), threshing percentage (27.9 to 32.0), seed
set (32.7 to 40.6%), and 1000 seed weight (29.30 to 31.8 g ).
The planting ratios did not significantly influence the germination, shoot
length, root length and vigour index. While, the germination percentage increased
by 3 percent with the application of 150 kg N per ha. The other seed quality
attributes like shoot and root length, seedling dry weight and vigour index increased
significantly due to additional doses of nitrogen application. The interaction effects
due to planting ratios and nitrogen levels were non-significant for all the characters.
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No . of references 132