Abstract
Efficient use of N in plant production is an essential goal in crop management. An experiment was performed at INTA Balcarce, Argentina during 3‐yr to evaluate the effect of row spacing and N level on nitrogen use efficiency (NUE) in no‐till (NT) irrigated maize ( Zea mays L.). Treatments consisted of a factorial combination of row width (70, 52 and 35 cm) and N rates (0 to 180 kg N ha −1 ). Nitrogen rate and narrow rows increased total dry matter (DM), grain yield, and N accumulation. Relative responses to narrow rows decreased as N availability increased. The NUE decreased with N rate and increased with narrow row spacing. Narrow rows increased NUE by 12 and 15% expressed as DM or grain yield per unit of available N, respectively. Physiological efficiency decreased with N rate and was not affected by row spacing. Recovery efficiency (RE) decreased with increasing N rate, and increased for the narrow row spacings. The effect of narrow rows on RE decreased as N availability increased. Narrow rows increased NUE largely as a result of increased RE. These increments in RE could contribute to increase the profitability of maize production and to diminish the risk of environmental pollution.
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Claims 13
Claim · model-written summary
Nitrogen rate increased maize dry matter, grain yield and N accumulation.
- Treatment
- Nitrogen ratee0
- Outcome
- total dry matter (DM), grain yield, and N accumulatione0
- Direction
- increasede0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate and narrow rows increased total dry matter (DM), grain yield, and N accumulation”
t0“Maize”
Claim · model-written summary
Narrow rows increased dry matter, grain yield and N accumulation.
- Treatment
- narrow rowse0
- Outcome
- total dry matter (DM), grain yield, and N accumulatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rate and narrow rows increased total dry matter (DM), grain yield, and N accumulation”
t0“Maize”
Claim · model-written summary
Response to narrow rows decreased as N availability increased.
- Treatment
- narrow rowse0
- Compound
- N availabilitye0
- Outcome
- Relative responses to narrow rowse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative responses to narrow rows decreased as N availability increased”
t0“Maize”
Claim · model-written summary
NUE decreased with increasing N rate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NUE decreased with N rate and increased with narrow row spacing”
t0“Maize”
Claim · model-written summary
NUE increased with narrow row spacing.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NUE decreased with N rate and increased with narrow row spacing”
t0“Maize”
Claim · model-written summary
Narrow rows increased dry-matter-based NUE by 12%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrow rows increased NUE by 12 and 15% expressed as DM or grain yield per unit of available N, respectively”
t0“Maize”
Claim · model-written summary
Narrow rows increased grain-yield-based NUE by 15%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrow rows increased NUE by 12 and 15% expressed as DM or grain yield per unit of available N, respectively”
t0“Maize”
Claim · model-written summary
Physiological efficiency declined with N rate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Physiological efficiency decreased with N rate and was not affected by row spacing”
t0“Maize”
Claim · model-written summary
Row spacing did not affect physiological efficiency.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Physiological efficiency decreased with N rate and was not affected by row spacing”
t0“Maize”
Claim · model-written summary
Recovery efficiency decreased with increasing N rate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery efficiency (RE) decreased with increasing N rate”
t0“Maize”
Claim · model-written summary
Recovery efficiency increased for narrow rows.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery efficiency (RE) decreased with increasing N rate, and increased for the narrow row spacings”
t0“Maize”
Claim · model-written summary
The effect of narrow rows on recovery efficiency declined with increasing N availability.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of narrow rows on RE decreased as N availability increased”
t0“Maize”
Claim · model-written summary
Increased recovery efficiency largely explained the NUE increase under narrow rows.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Narrow rows increased NUE largely as a result of increased RE”
t0“Maize”
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