Effect of gibberellic acid on growth, yield and seed quality of ajowain (Trachyspermum ammi L.)
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Date
2009
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Publisher
CCSHAU
Abstract
The experiment entitled “Effect of gibberellic acid on growth, yield and seed quality of
ajowain (Trachyspermum ammi L.)” was conducted during winter season of 2007-08
at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural
University, Hisar. The seed material used for the investigation was a local genotype
HAJ-18. In the present experiment, four different gibberellic acid concentrations
including control (0, 50, 75 and 100 ppm) were sprayed at four different stages of crop
growth (five-leaf, juvenile, flowering and initial seed setting stage). Sixteen treatment
combinations laid out in Randomized Block Design (factorial) were replicated thrice
making total of 48 plots.
Gibberellic acid application showed significant improvement in all the growth, yield
and seed quality parameters over control except electrical conductivity. The best results
for plant height at harvest, number of branches per plant at harvest, average node
length at harvest, days to 50 per cent flowering, dry weight per plant at harvest, number
of umbels per plant, number of umbellets per umbel, number of seeds per umbel,
number of seeds per umbellet, biological yield, stover yield, seed yield, harvest index,
germination percentage, seed vigour index and test weight were recorded with the
application of gibberellic acid at 100 ppm concentration. Stages of application of
gibberellic acid had a significant influence on growth, yield and quality parameters
except electrical conductivity. The maximum values for plant height at harvest, number
of branches per plant at harvest, average node length at harvest, days to 50 per cent
flowering, dry weight per plant at harvest, number of umbels per plant, number of
umbellets per umbel, number of seeds per umbel, number of seeds per umbellet,
biological yield, stover yield, seed yield and harvest index were recorded with the
application of gibberellic acid at juvenile stage. The maximum values for germination
percentage, seed vigour index and test weight were observed with the gibberellic acid
application at flowering stage. Interaction of gibberellic acid concentrations with stages
of application showed remarkable variation. Interaction of gibberellic acid 100 ppm
applied as foliar spray at juvenile stage was found to be the best with respect to all
growth, yield and quality parameters except electrical conductivity and harvest index.
The best result for harvest index was observed with the interaction of gibberellic acid
75 ppm applied at flowering stage. Electrical conductivity showed a non-significant
variation for different concentrations of gibberellic acid, stages of application and also
interaction effect.
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Keywords
Biological phenomena, Minerals, Livestock, Absorption, Crop residues, Mustard, Inorganic acid salts, Oilseed cakes, Fractionation, Concentrates