Abstract
SUMMARY A field experiment was carried out at the farm of Indian Agricultural Research Institute, New Delhi to quantify the effect of elevated carbon dioxide (CO 2 ) and different levels of N fertiliser application on nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) emissions from soil under maize. The experiment included five treatments: 60 kg N ha −1 under ambient CO 2 (385 ppm) in open plots, 120 kg N ha −1 under ambient CO 2 (385 ppm) in open plots, 160 kg N ha −1 under ambient CO 2 (385 ppm) in open plots, 120 kg N ha −1 under ambient CO 2 (385 ppm) in open top chambers (OTC) and 120 kg N ha −1 under elevated CO 2 (500 ± 50 ppm) in the OTC. Peaks of N 2 O flux were observed after every dose of N application. Cumulative N 2 O emission was 13% lower under ambient CO 2 as compared to the elevated CO 2 concentrations. There was an increase in CO 2 emissions with application of N from 60 kg ha −1 to 160 kg ha −1 . Higher yield and root biomass was observed under higher N treatment (160 kg N ha −1 ). There was no significant increase in maize yield under elevated CO 2 as compared to ambient CO 2 . The carbon emitted was more than the carbon fixed under elevated CO 2 as compared to ambient CO 2 levels. The carbon efficiency ratio (C fixed/C emitted) was highest in ambient CO 2 treatment in the OTC.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
N2O flux peaked after each N application.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Peaks of N 2 O flux were observed after every dose of N application.”
t0“MAIZE”
Claim · model-written summary
Cumulative N2O emissions under ambient CO2 were 13% lower than elevated CO2.
- Treatment
- ambient CO 2e0
- Outcome
- Cumulative N 2 O emissione0
- Direction
- lowere0
- Value
- 13%e0
- Comparator
- elevated CO 2 concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative N 2 O emission was 13% lower under ambient CO 2 as compared to the elevated CO 2 concentrations.”
t0“MAIZE”
Claim · model-written summary
Soil CO2 emissions increased as N application rose from 60 to 160 kg ha−1.
- Treatment
- application of N from 60 kg ha −1 to 160 kg ha −1e0
- Outcome
- CO 2 emissionse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was an increase in CO 2 emissions with application of N from 60 kg ha −1 to 160 kg ha −1 .”
t0“MAIZE”
Claim · model-written summary
Higher N treatment increased maize yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher yield and root biomass was observed under higher N treatment (160 kg N ha −1 ).”
t0“MAIZE”
Claim · model-written summary
Higher N treatment increased root biomass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher yield and root biomass was observed under higher N treatment (160 kg N ha −1 ).”
t0“MAIZE”
Claim · model-written summary
Elevated CO2 did not significantly increase maize yield.
- Treatment
- elevated CO 2e0
- Outcome
- maize yielde0
- Direction
- no significant increasee0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant increase in maize yield under elevated CO 2 as compared to ambient CO 2 .”
Claim · model-written summary
Carbon emitted exceeded carbon fixed under elevated CO2 relative to ambient.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carbon emitted was more than the carbon fixed under elevated CO 2 as compared to ambient CO 2 levels.”
t0“MAIZE”
Claim · model-written summary
Carbon efficiency ratio was highest under ambient CO2 in OTC.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carbon efficiency ratio (C fixed/C emitted) was highest in ambient CO 2 treatment in the OTC.”
t0“MAIZE”
The same questions in other papers
co2 · yield · Zea mays (maize)Results differ
10 papers in the same direction as this paper · 41 in the opposite direction
- positive
- positive
- positive
48 papers more in this group
See all 52 papers →co2 · molecular: metabolites · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 10 in the opposite direction
- no effect
- negative
- no effect
11 papers more in this group
See all 15 papers →nitrogen · growth · Zea mays (maize)Positive and negative results
618 papers in the same direction as this paper · 115 in the opposite direction · 14 reporting no difference from an alternative
- negative
- no effect
- negative
744 papers more in this group
See all 748 papers →nitrogen · yield · Zea mays (maize)Positive and negative results
1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
- negative
- no effect
- negative
2,181 papers more in this group
See all 2,185 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.