Abstract
Abstract Corn ( Zea mays L.) genotypes vary in their response to applied N fertilizer. Nitrogen uptake by the plant is controlled by N influx at the root surface and the size and morphology of the root system. The objective of this study was to investigate the effect of applied N on mean N influx and root growth of two genotypes that differed in their response to N. Nitrogen rates were 0 and 227 kg ha −1 for ‘Pioneer 3732’ and ‘B73✕Mo17’ grown on Raub silt loam (Aquic Argiudolls) and 227 kg N ha −1 on Chalmers silt loam (Typic Haplaquolls). Root growth, plant weight, and N content were measured 31,47,61,75,91 and 109 days after planting. Apart from an initial difference at 31 days, mean N influx of roots of both genotypes were similar. Root length and root surface area of Pioneer 3732 were not increased by the application of N. In contrast, applied N increased root growth of B73✕Mo17. By midsilk (75 days) root length of B73✕Mo17 was 36 and 39% greater than that of Pioneer 3732 on the Raub and Chalmers soils, respectively, to which N was applied. The greater root growth of B73✕Mo17 and the continued root growth of this hybrid after midsilk appears to be one possible mechanism to explain the greater growth of this hybrid under a high‐N fertilizer regime. This requires further verification under a wider range of environmental conditions. A lack of moisture limited the grain yields of both hybrids in this study.
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Claims 8
Claim · model-written summary
Mean root nitrogen influx was similar between genotypes apart from day 31.
Verbatim
e0“Apart from an initial difference at 31 days, mean N influx of roots of both genotypes were similar.”
Claim · model-written summary
Nitrogen application did not increase Pioneer 3732 root length.
- Taxon
- Corn
Zea mays subsp. mayst0 - Material
- Pioneer 3732e0
- Treatment
- application of Ne0
- Outcome
- Root lengthe0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length and root surface area of Pioneer 3732 were not increased by the application of N.”
t0“Corn”
Claim · model-written summary
Nitrogen application did not increase Pioneer 3732 root surface area.
- Taxon
- CornZea mays subsp. mayst0
- Material
- Pioneer 3732e0
- Treatment
- application of Ne0
- Outcome
- root surface areae0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root length and root surface area of Pioneer 3732 were not increased by the application of N.”
t0“Corn”
Claim · model-written summary
Applied nitrogen increased B73✕Mo17 root growth.
- Taxon
- CornZea mays subsp. mayst0
- Material
- B73✕Mo17e0
- Treatment
- applied Ne0
- Outcome
- root growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applied N increased root growth of B73✕Mo17”
t0“Corn”
Claim · model-written summary
At midsilk on Raub soil with nitrogen, B73✕Mo17 roots were 36% longer than Pioneer 3732 roots.
- Taxon
- CornZea mays subsp. mayst0
- Material
- B73✕Mo17e0
- Organ / stage
- midsilke0
- Outcome
- root lengthe0
- Direction
- greatere0
- Value
- 36 and 39%e0
- Comparator
- Pioneer 3732e0
- Setting
- Raube0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By midsilk (75 days) root length of B73✕Mo17 was 36 and 39% greater than that of Pioneer 3732 on the Raub and Chalmers soils, respectively, to which N was applied.”
t0“Corn”
Claim · model-written summary
At midsilk on Chalmers soil with nitrogen, B73✕Mo17 roots were 39% longer than Pioneer 3732 roots.
- Taxon
- CornZea mays subsp. mayst0
- Material
- B73✕Mo17e0
- Organ / stage
- midsilke0
- Outcome
- root lengthe0
- Direction
- greatere0
- Value
- 39%e0
- Comparator
- Pioneer 3732e0
- Setting
- Chalmerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By midsilk (75 days) root length of B73✕Mo17 was 36 and 39% greater than that of Pioneer 3732 on the Raub and Chalmers soils, respectively, to which N was applied.”
t0“Corn”
Claim · model-written summary
Continued root growth after midsilk is proposed to explain greater B73✕Mo17 growth under high nitrogen.
- Taxon
- CornZea mays subsp. mayst0
- Material
- B73✕Mo17e0
- Outcome
- greater growth of this hybride0
- Qualifier
- continued root growth of this hybrid after midsilke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greater root growth of B73✕Mo17 and the continued root growth of this hybrid after midsilk appears to be one possible mechanism to explain the greater growth of this hybrid under a high‐N fertilizer regime.”
t0“Corn”
Claim · model-written summary
Lack of moisture limited grain yield in both hybrids.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- lack of moisturee0
- Outcome
- grain yieldse0
- Direction
- limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A lack of moisture limited the grain yields of both hybrids in this study.”
t0“Corn”
The same questions in other papers
nitrogen · growth · Zea mays (maize)Positive and negative results
618 papers in the same direction as this paper · 115 in the opposite direction · 14 reporting no difference from an alternative
- positive
- positive
- negative
744 papers more in this group
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