Abstract
Soils under irrigated agriculture are a significant source of nitrous oxide (N2O) owing to high inputs of nitrogen (N) fertiliser and water. This study investigated the potential for N2O mitigation by manipulating the soil moisture deficit through irrigation scheduling in combination with, and in comparison to, using the nitrification inhibitor, 3,4-dimethylpyrazole phosphate (DMPP). Lysimeter cores planted with wheat were fitted with automated chambers for continuous measurements of N2O fluxes. Treatments included conventional irrigation (CONV), reduced deficit irrigation (RED), CONV-DMPP and RED-DMPP. The total seasonal volume of irrigation water applied was constant for all treatments but the timing and quantity in individual irrigation applications varied among treatments. 15N-labelled urea was used to track the source of N2O emissions and plant N uptake. The majority of N2O emissions occurred immediately after irrigations began on 1 September 2014. Applying RED and DMPP individually slightly decreased N2O emissions but when applied in combination (RED-DMPP) the greatest reductions in N2O emissions were observed. There was no effect of treatments on plant N uptake, 15N recovery or yield possibly because the system was not N limited. Half of the plant N and 53% to 87% of N2O was derived from non-fertiliser sources in soil, highlighting the opportunity to further exploit this valuable N pool.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by.
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
Reduced deficit irrigation (RED) slightly decreased N2O emissions from wheat cropping.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- REDe1
- Outcome
- N2O emissionse1
- Direction
- decreasede1
- Qualifier
- slightlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e1“Applying RED and DMPP individually slightly decreased N2O emissions but when applied in combination (RED-DMPP) the greatest reductions in N2O emissions were observed”
Claim · model-written summary
DMPP applied alone slightly decreased N2O emissions from wheat cropping.
- Taxon
- wheatTriticum aestivume0
- Treatment
- DMPPe1
- Outcome
- N2O emissionse1
- Direction
- decreasede1
- Qualifier
- slightlye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e1“Applying RED and DMPP individually slightly decreased N2O emissions but when applied in combination (RED-DMPP) the greatest reductions in N2O emissions were observed”
Claim · model-written summary
Combined RED and DMPP gave the greatest reductions in N2O emissions from wheat cropping.
- Taxon
- wheatTriticum aestivume0
- Treatment
- RED-DMPPe1
- Outcome
- N2O emissionse1
- Direction
- greatest reductionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e1“Applying RED and DMPP individually slightly decreased N2O emissions but when applied in combination (RED-DMPP) the greatest reductions in N2O emissions were observed”
Claim · model-written summary
The majority of N2O emissions occurred immediately after irrigation began on 1 September 2014 in wheat lysimeters.
- Taxon
- wheatTriticum aestivume0
- Outcome
- N2O emissionse2
- Value
- The majoritye2
- Qualifier
- immediately after irrigations began on 1 September 2014e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e2“The majority of N2O emissions occurred immediately after irrigations began on 1 September 2014”
Claim · model-written summary
Treatments had no effect on wheat plant N uptake, 15N recovery or yield, possibly because the system was not N limited.
- Taxon
- wheatTriticum aestivume0
- Treatment
- treatmentse3
- Outcome
- plant N uptake, 15N recovery or yielde3
- Direction
- no_changeinferrede3
- Qualifier
- possibly because the system was not N limitede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e3“There was no effect of treatments on plant N uptake, 15N recovery or yield possibly because the system was not N limited”
Claim · model-written summary
Half of the wheat plant N was derived from non-fertiliser sources in soil.
- Taxon
- wheatTriticum aestivume0
- Outcome
- plant Ne4
- Value
- Halfe4
- Qualifier
- derived from non-fertiliser sources in soile4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e4“Half of the plant N and 53% to 87% of N2O was derived from non-fertiliser sources in soil”
Claim · model-written summary
53% to 87% of N2O from wheat cropping was derived from non-fertiliser sources in soil.
- Taxon
- wheatTriticum aestivume0
- Outcome
- N2Oe4
- Value
- 53% to 87%e4
- Qualifier
- derived from non-fertiliser sources in soile4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e4“Half of the plant N and 53% to 87% of N2O was derived from non-fertiliser sources in soil”
Claim · model-written summary
The authors recommend further exploiting the non-fertiliser soil N pool in wheat systems.
- Taxon
- wheatTriticum aestivume0
- Outcome
- further exploit this valuable N poole5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lysimeter cores planted with wheat”
e5“highlighting the opportunity to further exploit this valuable N pool”
The same questions in other papers
irrigation · environment: emissions · Triticum aestivum (wheat)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
8 papers more in this group
See all 12 papers →light · environment: emissions · Triticum aestivum (wheat)Results agree
2 papers in the same direction as this paper
- positive
- positive
phosphorus · environment: emissions · Triticum aestivum (wheat)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.