dc.contributor.author |
MAHMOOD, RASHID |
|
dc.date.accessioned |
2017-11-28T08:58:48Z |
|
dc.date.accessioned |
2020-04-14T19:39:40Z |
|
dc.date.available |
2020-04-14T19:39:40Z |
|
dc.date.issued |
2009 |
|
dc.identifier.uri |
http://142.54.178.187:9060/xmlui/handle/123456789/8081 |
|
dc.description.abstract |
Calcium carbide is well known as a nitrification inhibitor and its role as a source of ethylene
(C2H4), a potent plant growth regulator, is not thoroughly investigated. Laboratory, pot and field
studies were conducted, in a sequence, up to 4 years to evaluate the effectiveness of calcium
carbide (CaC2) on nitrogen use efficiency, growth and yield of wheat. First and 2nd experiments
were conducted to assess the best rate and time of application of encapsulated calcium carbide
(ECC) regarding plant growth and yield parameters of wheat. It was found that ECC @ 22.5 mg
kg-1 soil, applied 2 weeks after sowing performed the best of all other rates and times of
application of ECC in improving economical yield of wheat. In the 3rd experiment CaC2 coated
with bee wax, paraffin wax and black enamel paint and matrices (prepared with polyethylene)
was used to slow release the gases. Release of acetylene and ethylene from these calcium carbide
based formulations and their impact on nitrification process in the soil environment under
laboratory conditions was studied. It was noted that matrix-I (containing 21 % CaC2) not only
performed as the best and sustainable source of acetylene and ethylene in the soil but also
inhibited nitrification process better than other formulations. Calcium carbide based formulations
were also compared in pot studies regarding their effect on wheat seed germination and growth
and yield parameters of wheat. Matrix-I benefited the wheat crop to the maximum, followed by
matrix-II and paint coated calcium carbide. Two further pot experiments were conducted to know
the best rate and application depth of matrix-I formulated calcium carbide with and with out
nitrogen fertilizer application. It is evident from the results that matrix-I not only improved
growth and yield parameters of wheat but also enhanced N uptake by different plant parts of
wheat when applied @ 15 mg CaC2 kg-1 soil at 8 cm soil depth. It was further noted that matrix-I
better improved N use efficiency when applied with half recommended dose of N fertilizer than
that of with full recommended N fertilizer rate. Two years field experimentation confirmed the
results of pot studies. Under field condition CaC2 based formulations not only improved wheat
growth and yield parameters but also reduced lodging of a lodging susceptible wheat variety
Bhakhar-2002. Overall results suggest that application of calcium carbide increased grain yield
more than 30 % by improving yield contributing factors and N use efficiency. |
en_US |
dc.description.sponsorship |
Higher Education Commission, Pakistan. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
UNIVERSITY OF AGRICULTURE FAISALABAD, PAKISTAN |
en_US |
dc.subject |
Natural Sciences |
en_US |
dc.title |
EFFECTIVENESS OF CALCIUM CARBIDE FOR IMPROVING NUTRIENT USE EFFICIENCY AND YIELD OF WHEAT CROP |
en_US |
dc.type |
Thesis |
en_US |