Abstract
No‐tillage affects maize ( Zea mays L.) fertilizer N use efficiency when urea is surface‐applied, due to NH 3 volatilization. A 3‐year field experiment was conducted at Balcarce, Argentina (37°45′ S, 58°18′ W), on a soil complex of a fine, mixed, thermic Typic Argiudoll and a fine, illitic, thermic Petrocalcic Paleudoll. The objective was to evaluate the effect of surface‐applied urea rate (0, 35, 70, 140, and 210 kg N ha −1 ), with and without a urease inhibitor [ N ‐( n ‐butyl) thiophosphoric triamide] (nBTPT) at different times (planting; six‐leaf stage, V6) on NH 3 volatilization losses, soil mineral N, and maize N uptake and grain yield under no‐tillage. A semiopen static system was used to monitor NH 3 volatilization losses. Ammonia N losses from urea without nBTPT ranged between 2.6 and 13.3% of applied N, being greater with higher N rates and when the urea was applied at V6. Volatilization losses with nBTPT were not different than those from the control. The use of nBTPT did not increase soil mineral N consistently and did not increase N uptake nor grain yield. Relative to fertilization at planting, fertilization at V6 increased soil mineral N at flowering, N uptake at physiological maturity (167 and 155 kg ha −1 , respectively), and grain yield (11 003 and 10 440 kg ha −1 , respectively). For slightly acid and high organic matter soils, the use of nBTPT did not improve urea N use efficiency. Delayed urea application had a greater and more consistent effect than the use of nBTPT on the increase of no‐till maize grain yield and N use efficiency.
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Claims 13
Claim · model-written summary
Ammonia N losses without nBTPT ranged from 2.6 to 13.3% of applied N.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonia N losses from urea without nBTPT ranged between 2.6 and 13.3% of applied N”
t0“Maize”
Claim · model-written summary
Ammonia N losses were greater at higher N rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“being greater with higher N rates”
t0“Maize Nitrogen”
e1“Ammonia N losses from urea without nBTPT”
Claim · model-written summary
Ammonia N losses were greater with urea applied at V6.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the urea was applied at V6”
t0“Maize Nitrogen”
e1“Ammonia N losses from urea without nBTPT”
Claim · model-written summary
nBTPT volatilization losses did not differ from control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Volatilization losses with nBTPT were not different than those from the control.”
t0“Maize”
Claim · model-written summary
nBTPT did not consistently raise soil mineral N.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of nBTPT did not increase soil mineral N consistently”
t0“Maize”
Claim · model-written summary
nBTPT did not raise maize N uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not increase N uptake nor grain yield”
t0“Maize Nitrogen Uptake and Yield: Effect of Urease Inhibitor”
e1“The use of nBTPT did not increase soil mineral N consistently”
Claim · model-written summary
nBTPT did not raise grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not increase N uptake nor grain yield”
t0“Maize Nitrogen Uptake and Yield: Effect of Urease Inhibitor”
Claim · model-written summary
V6 fertilization increased soil mineral N at flowering relative to planting.
- Organ / stage
- floweringe0
- Treatment
- fertilization at V6e0
- Outcome
- soil mineral Ne0
- Direction
- increasede0
- Comparator
- fertilization at plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to fertilization at planting, fertilization at V6 increased soil mineral N at flowering”
t0“Maize”
Claim · model-written summary
V6 fertilization raised N uptake at maturity to 167 versus 155 kg ha −1 at planting.
- Organ / stage
- physiological maturitye0
- Treatment
- fertilization at V6e0
- Outcome
- N uptakee0
- Direction
- increasede0
- Value
- 167 and 155 kg ha −1e0
- Comparator
- fertilization at plantinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilization at V6 increased soil mineral N at flowering, N uptake at physiological maturity (167 and 155 kg ha −1 , respectively)”
t0“Maize Nitrogen Uptake and Yield: Effect of Urease Inhibitor and Application Time”
e1“Relative to fertilization at planting”
Claim · model-written summary
V6 fertilization raised grain yield to 11 003 versus 10 440 kg ha −1 at planting.
- Treatment
- fertilization at V6e0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 11 003 and 10 440 kg ha −1e0
- Comparator
- fertilization at plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to fertilization at planting, fertilization at V6 increased soil mineral N at flowering, N uptake at physiological maturity (167 and 155 kg ha −1 , respectively), and grain yield (11 003 and 10 440 kg ha −1 , respectively).”
t0“Maize”
Claim · model-written summary
nBTPT did not improve urea N use efficiency in slightly acid, high organic matter soils.
- Treatment
- nBTPTe0
- Outcome
- urea N use efficiencye0
- Direction
- did not improvee0
- Qualifier
- slightly acid and high organic matter soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For slightly acid and high organic matter soils, the use of nBTPT did not improve urea N use efficiency.”
t0“Maize”
Claim · model-written summary
Delayed urea application had a larger and more consistent effect on yield than nBTPT.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed urea application had a greater and more consistent effect than the use of nBTPT on the increase of no‐till maize grain yield and N use efficiency.”
Claim · model-written summary
Delayed urea application had a larger and more consistent effect on N use efficiency than nBTPT.
- Treatment
- Delayed urea applicatione0
- Outcome
- N use efficiencye0
- Direction
- greatere0
- Comparator
- use of nBTPTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed urea application had a greater and more consistent effect than the use of nBTPT on the increase of no‐till maize grain yield and N use efficiency.”
The same questions in other papers
EC 3.5.1.5 (urease) inhibitor · yield · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
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See all 15 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.