Abstract
Precision‐guided technologies enable corn ( Zea mays L.) growers to apply pre‐plant anhydrous ammonia (NH 3 ) parallel to intended corn rows even when full‐width tillage follows NH 3 application. Close, but crop‐safe, proximity of NH 3 to corn rows may potentially increase N use efficiency and lower N requirements and nitrous oxide (N 2 O) emissions. Experiments in 2011 and 2012 on silty clay loam Mollisol near West Lafayette, IN, assessed area‐ and yield‐scaled N 2 O emissions when spring pre‐plant NH 3 was applied at recommended (202 kg N ha −1 ) and reduced rate (145 kg N ha −1 ), in no‐till (NT) and conventional tillage (CT) systems following NT soybean [ Glycine max (L.) Merr.]. Each 12‐cm deep NH 3 band was positioned 15 cm from, and parallel to, intended corn rows using precision guidance. Nitrification of NH 3 in application bands was 31% faster under CT than NT. Area‐ and grain yield‐scaled N 2 O emissions were N rate dependent in both growing seasons. On average, CT+202 kg N resulted in highest area‐scaled (mean = 2.45 kg N ha −1 ) and grain yield‐scaled (mean = 360 g N Mg −1 ) N 2 O emissions. In contrast, CT+145 kg N had similar yield‐scaled emissions as NT+202 and NT+145 kg N, and reduced area‐scaled N 2 O emissions by 65, 45, and 19% respectively, relative to CT+202 kg N, NT+202 kg N, and NT+145 kg N treatments. These preliminary results suggest that reducing pre‐plant NH 3 rates by ∼30% under CT has the potential to reduce N 2 O emissions without significant yield declines in the CT phase of a NT–CT rotation, despite faster nitrification in CT.
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Claims 11
Claim · model-written summary
Ammonia nitrification was 31% faster under conventional than no tillage.
- Taxon
- corn
Zea mays subsp. mayse7 - Treatment
- CTe0
- Outcome
- Nitrification of NH 3e0
- Direction
- fastere0
- Value
- 31%e0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrification of NH 3 in application bands was 31% faster under CT than NT.”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
Area-scaled nitrous oxide emissions depended on nitrogen rate in both seasons.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- N ratee0
- Outcome
- area‐scaled N 2 O emissionse3
- Qualifier
- both growing seasonse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Area‐ and grain yield‐scaled N 2 O emissions were N rate dependent in both growing seasons.”
e1“area‐scaled N 2 O emissions”
e7“corn ( Zea mays L.) growers”
e3“area‐scaled N 2 O emissions”
Claim · model-written summary
Grain yield-scaled nitrous oxide emissions depended on nitrogen rate in both seasons.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- N ratee0
- Outcome
- grain yield‐scaled N 2 O emissionse0
- Qualifier
- both growing seasonse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Area‐ and grain yield‐scaled N 2 O emissions were N rate dependent in both growing seasons.”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
CT with 202 kg N had the highest area-scaled nitrous oxide emissions, averaging 2.45 kg N per hectare.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+202 kg Ne0
- Outcome
- area‐scalede0
- Direction
- higheste0
- Value
- 2.45 kg N ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT+202 kg N resulted in highest area‐scaled (mean = 2.45 kg N ha −1 ) and grain yield‐scaled (mean = 360 g N Mg −1 ) N 2 O emissions.”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
CT with 202 kg N had the highest grain yield-scaled nitrous oxide emissions, averaging 360 g N per Mg.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+202 kg Ne0
- Outcome
- grain yield‐scalede0
- Direction
- higheste0
- Value
- 360 g N Mg −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT+202 kg N resulted in highest area‐scaled (mean = 2.45 kg N ha −1 ) and grain yield‐scaled (mean = 360 g N Mg −1 ) N 2 O emissions.”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
CT with 145 kg N had similar yield-scaled emissions to NT with 202 kg N.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+145 kg Ne0
- Outcome
- yield‐scaled emissionse0
- Direction
- similare0
- Comparator
- NT+202e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT+145 kg N had similar yield‐scaled emissions as NT+202 and NT+145 kg N”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
CT with 145 kg N had similar yield-scaled emissions to NT with 145 kg N.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+145 kg Ne0
- Outcome
- yield‐scaled emissionse0
- Direction
- similare0
- Comparator
- NT+145 kg Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CT+145 kg N had similar yield‐scaled emissions as NT+202 and NT+145 kg N”
e7“corn ( Zea mays L.) growers”
Claim · model-written summary
CT with 145 kg N reduced area-scaled emissions by 65% relative to CT with 202 kg N.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+145 kg Ne2
- Outcome
- area‐scaled N 2 O emissionse0
- Direction
- reducede0
- Value
- 65e0
- Comparator
- CT+202 kg Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced area‐scaled N 2 O emissions by 65, 45, and 19% respectively, relative to CT+202 kg N, NT+202 kg N, and NT+145 kg N treatments.”
e7“corn ( Zea mays L.) growers”
e2“CT+145 kg N”
Claim · model-written summary
CT with 145 kg N reduced area-scaled emissions by 45% relative to NT with 202 kg N.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+145 kg Ne2
- Outcome
- area‐scaled N 2 O emissionse0
- Direction
- reducede0
- Value
- 45e0
- Comparator
- NT+202 kg Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced area‐scaled N 2 O emissions by 65, 45, and 19% respectively, relative to CT+202 kg N, NT+202 kg N, and NT+145 kg N treatments.”
e7“corn ( Zea mays L.) growers”
e2“CT+145 kg N”
Claim · model-written summary
CT with 145 kg N reduced area-scaled emissions by 19% relative to NT with 145 kg N.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- CT+145 kg Ne2
- Outcome
- area‐scaled N 2 O emissionse0
- Direction
- reducede0
- Value
- 19e0
- Comparator
- NT+145 kg Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced area‐scaled N 2 O emissions by 65, 45, and 19% respectively, relative to CT+202 kg N, NT+202 kg N, and NT+145 kg N treatments.”
e7“corn ( Zea mays L.) growers”
e2“CT+145 kg N”
Claim · model-written summary
Reducing preplant ammonia rate by about 30% under CT may reduce emissions without significant yield declines.
- Taxon
- cornZea mays subsp. mayse7
- Treatment
- reducing pre‐plant NH 3 rates by ∼30% under CTe0
- Outcome
- reduce N 2 O emissions without significant yield declinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing pre‐plant NH 3 rates by ∼30% under CT has the potential to reduce N 2 O emissions without significant yield declines”
e7“corn ( Zea mays L.) growers”
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See all 1,099 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.