Abstract
Abstract Ammonia volatilization, a primary N loss pathway from rice ( Oryza sativa L.) production systems, leads to a reduction in N use efficiency and environmental problems. Ammonia volatilization has not been studied in water‐seeded rice systems or where aqueous NH 3 is the primary fertilizer N source. Our objective was to quantify NH 3 volatilization from preplant aqueous NH 3 and compare it with drilled or broadcast urea. In addition, NH 3 volatilization from a topdress N application applied midseason was quantified. This was accomplished with 10 field experiments representing a range of soil types. Preplant N treatments were a zero‐N control, injected aqueous NH 3 , broadcast urea, and drilled urea all applied at the farmer application rate to a dry soil. For the topdress experiment, the treatments were a zero‐N control and urea or (NH 4 ) 2 SO 4 applied at 34 kg N ha −1 . Ammonia volatilization was measured up to 3 and 1 wk after the preplant and topdress N was applied, respectively, using a semi‐open static chamber. Losses due to NH 3 volatilization from preplant broadcast urea were significantly higher than from the other other treatments but accounted for <2% of applied N. Losses from aqueous NH 3 and banded urea were lower but were significantly greater than from the control. The losses occurred in the first week after flooding. When N was topdressed, 1.5 and 2.6% of applied N were lost via volatilization from urea and (NH 4 ) 2 SO 4 , respectively.
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 6
Claim · model-written summary
Preplant broadcast urea lost significantly more ammonia than other treatments, although loss was under 2% of applied N.
- Taxon
- rice
Oryza sativat0 - Treatment
- preplant broadcast ureae0
- Outcome
- NH 3 volatilizatione0
- Direction
- highere0
- Value
- <2% of applied Ne0
- Comparator
- other other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Losses due to NH 3 volatilization from preplant broadcast urea were significantly higher than from the other other treatments but accounted for <2% of applied N”
t0“rice”
Claim · model-written summary
Aqueous ammonia losses were significantly greater than the control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Losses from aqueous NH 3 and banded urea were lower but were significantly greater than from the control”
t0“rice”
Claim · model-written summary
Banded urea losses were significantly greater than the control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Losses from aqueous NH 3 and banded urea were lower but were significantly greater than from the control”
t0“rice”
Claim · model-written summary
Volatilization losses occurred in the first week after flooding.
- Taxon
- riceOryza sativat0
- Outcome
- lossese0
- Qualifier
- first week after floodinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The losses occurred in the first week after flooding”
t0“rice”
Claim · model-written summary
Topdressed urea lost 1.5% of applied N by volatilization.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N was topdressed, 1.5 and 2.6% of applied N were lost via volatilization from urea and (NH 4 ) 2 SO 4 , respectively”
t0“rice”
Claim · model-written summary
Topdressed ammonium sulfate lost 2.6% of applied N by volatilization.
- Taxon
- riceOryza sativat0
- Treatment
- (NH 4 ) 2 SO 4e0
- Outcome
- volatilizatione0
- Direction
- loste0
- Value
- 2.6% of applied Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N was topdressed, 1.5 and 2.6% of applied N were lost via volatilization from urea and (NH 4 ) 2 SO 4 , respectively”
t0“rice”
The same questions in other papers
nitrogen · yield · Oryza sativa (rice)Positive and negative results
241 papers in the same direction as this paper · 1,803 in the opposite direction
- positive
- positive
- positive
2,041 papers more in this group
See all 2,045 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.