Hazra, S., Swain, D.K.
and Bhadoria, P.B.S.
2019
Wheat grown under elevated CO2
was more responsive to
nitrogen fertilizer in Eastern India.
European Journal of Agronomy 105: 1-12.
NOTE:
Wheat is the second most important
food crop in India, which produces
around 11% of global wheat grain
production.
Hazra et al. (2019) investigated
the effects of elevated CO2
and varying nutrient management
strategies on the growth and yield
of wheat (Triticum aestivum, cv. Sonalika).
SUMMARY:
Hazra et al. report that
various yield attributes
(i.e., 1000-grain weight,
average panicle length
and weight, spikelets
per panicle and filled
grain percentage)
all tended
"to show positive response
under CO2 enrichment
in comparison to ambient CO2."
Elevated CO2 increased grain yield
by +35% in the no N added treatment
and by +16-17% under the three other
nitrogen management regimes.
Grain yield was positively correlated
with N application, where increases
from +116-180% were observed
(relative to the N0 treatment)
at the normal and
50% above normal
doses of N.
Hazra et al. conclude that
"wheat production under the
elevated CO2 environment
in Eastern India might be
maintained or improved
through the normal
and increased dose
of N fertilizer
application."
Elevated CO2
and N management
practices will increase
wheat grain yields
in a higher CO2 level
future climate.
DETAILS:
The work was conducted
in open top chambers
at the experimental farm
of the Agricultural and Food
Engineering Department
of the Indian Institute of
Technology, Kharagpur, India
over three growing seasons.
Treatments included
two CO2 concentrations
(ambient at 394 ppm or
elevated at 599 ppm)
and four nitrogen (N)
supply levels, including
no N fertilizer addition (N0),
normal N application
via chemical fertilizer
(N100(CF)),
50% higher dose
via chemical fertilizer
(N150(CF))
and a 50% higher dose
via chemical and organic
fertilizer (N150(OF+CF).
CO2 enrichment was supplied
between 8-10 hours
during the day
over the course of
each growing season.
