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This study is primarily related to use humic acid as a soil
conditioner and calcium carbide as plant growth regulator. Humic
acid improves soil organic matter, water holding capacity, and
nutrient use efficiency, whereas calcium carbide is potential
source of two gases, acetylene and ethylene. Acetylene acts as
nitrification inhibitor while slowly releasing ethylene works as
phytohormone. The study shows that plant height, number of flowers,
number of green pods per plant, green pod dry weight, shoot and
root dry weight, nutrient uptake in fruit of okra plants were
positively affected by calcium carbide and humic acid.
Calcium carbide releases acetylene gas upon its reaction with water
that is further converted to ethylene in soil due to microbial
reduction. Acetylene inhibits the activity of ammonia-oxidizing
enzymes involved in the nitrification process, thus resulting in
the inhibition of nitrification and denitrification processes and
increase in the nitrogen fertilizer use efficiency. A series of
studies were conducted with collaboration of Higher Education
Commission (HEC), Pakistan during 2008-2011. The outcomes of these
studies demonstrated the improvement in growth and yield of
vegetable crops through bi-facet action of calcium carbide i.e. as
a source of plant hormone, Ethylene as well as nitrification
inhibitor, Acetylene. Any formulation of Calcium carbide which
leads to slow and gradual release of ethylene and acetylene gases
in soil could be useful in improving the nutrient use efficiency as
well as growth and yields of vegetables.
This study is primarily related to growth regulators focusing on a
major group ethylene produced from a solid i.e. calcium carbide
(C2H4). Calcium carbide is best source of two gases, acetylene and
ethylene. Acetylene acts as nitrification inhibitor while ethylene
acts as phytohormone. Calcium carbide based formulations are
effective to augment yield of vegetables especially cucumber. A pot
experiment was conducted in the wire house of Institute of Soil and
Environment & Sciences; University of Agriculture Faisalabad to
evaluate the effect of different rates of formulated (paint coated)
calcium carbide (CaC2) on growth and yield of cucumber (Cucumis
sativus L.).
Salinity is one of the major constraints, whichhamper agricultural
production. The higherconcentration of salts in root zone may
stimulateendogenous ethylene biosynthesis in roots,
whichconsequently inhibits its growth. One of the majormechanism
utilized by plant growth promotingrhizobacteria (PGPR) to
facilitate plant growth anddevelopment is the lowering of ethylene
levels in theplant roots by deamination
of1-aminocyclopropane-1-carboxylic acid (ACC), theimmediate
precursor of ethylene in plants. In thegiven study, three
pre-isolated bacterial strainshaving ACC deaminase activity were
used forinoculation of wheat seeds. Inoculated seeds weresown in
salt affected field, fertilized with NPK@120-100-60 kg ha-1,
respectively. Data regardingvarious growth parameters and yield
parameters wasrecorded at the time of harvesting and
statisticallyanalyzed. From data it was concluded that plantgrowth
promoting rhizobacteria containingACC-deaminase activity can
enhance the growth andyield of wheat under salinity stress field
conditionsand the strain ACC10 performs the best.
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