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.
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