STUDIES ON NIPPING OF AUXILIARY FLOWER RUDS AND MICRONUTRIENT APPLICATION ON SEED YIELD AND QUALITY OF SUNFLOWER RESTORER LINE. RHA-857
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Date
2001
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD
Abstract
"Most of the restorer parents used in sunflower hybrid seed
production are of multi branched with low productivity. To solve these
constraints, an investigation on nipping of auxiliary flower buds and
micronutrient application on seed yield and quality of sunflower restorer
line, RHA-857 was carried out by conducting a field experiment at Main
Research Station, University of Agricultural Sciences, Dharwad. The
experiment was laid out in Randomized Block Design with factorial
concept and consisted of two factors viz., nipping (2) and micronutrients
application (5) and with one control (no nipping/no micronutrient).
In restorer line, continuous nipping of auxiliary flower buds from 35
days after sowing (DAS) onwards recorded significantly higher yield and
its attributes. Seed yield per hectare increased 65.8 per cent over control.
The yield attributes like yield per plant, capitulum diameter, filled seed
number, seed filling per cent, seed recovery per cent and 100 seed weight
were also increased in this treatment. This was followed by nipping of side
branches once at 55 DAS over control. Plant height and chlorophyll
content in leaf were significantly higher in nipped plants, while higher dry
matter was found in control plants. Seed quality parameters like
germination percentage, rate of germination, root length, shoot length,
vigour index, dry weight and oil content were significantly higher in the
seeds of nipped plants over control.
Among the micronutrient application, foliar spray of boron or
ZnS04 @ 0.1% at ray floret stage (55 DAS) increased the seed yield by
38.2 and 18.0%, respectively over control. Similarly boron @ 2 kg/ha
dusting at ray floret stage, ZnS04 @ 10 and 20 kg/ha through soil
application also increased the seed yield by 27.3, 7.9 and 15.0%,
respectively over control. Further, it is also observed that application of
boron (0.1%) increased the capitulum diameter, filled seed number, seed
weight per capitulum, seed set percentage, 100 seed weight, germination,
rate of germination, root length, shoot length, vigour index, dry weight of
seedling and oil content of seed.
"
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No. of references 80