Abstract
Abstract The response of maize to four rates of nitrogen (N) fertiliser (0, 60, 120 and 240 kg N ha −1 ) on an ultisol in south‐eastern Nigeria was evaluated under two tillage and two mulch treatments. Differences in plant height, leaf area index and grain yield between the conventionally tilled and zero‐tillage treatments were not significant at P < 0.05, but the mulched plots out‐yielded the unmulched plots by 23–46% during the drier seasons. On each tillage‐mulch combination, grain yield response to nitrogen was of a quadratic polynomial form, indicating that maximum yields occurred at 123, 139, 130 and 142 kg N ha −1 on the tilled‐mulched, tilled‐unmulched, untilled‐mulched and untilled‐unmulched plots, respectively. Nitrogen use efficiency (grain yield per kg N applied) decreased in the order tilled‐mulched (32.6) > untilled‐mulched (30.9) > untilled‐unmulched (27.8) > tilled‐unmulched (22.4) where the figures in parentheses represent nitrogen use efficiency (kg kg −1 ). For each tillage treatment maximum soil temperature was higher and moisture retained at 2 and 10 days after saturation lower on the unmulched than mulched plots. Percentage moisture loss between these days was 45.5, 83.3, 25.0 and 55.6 respectively, on the tilled‐mulched, tilled‐unmulched, untilled‐mulched and untilled‐unmulched plots. The untilled‐mulched plots had the highest contents of residual organic carbon and total N.
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Claims 7
Claim · model-written summary
Tillage did not significantly alter maize height, leaf area index or grain yield.
- Treatment
- conventionally tillede0
- Outcome
- plant height, leaf area index and grain yielde0
- Comparator
- zero‐tillage treatmentse0
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in plant height, leaf area index and grain yield between the conventionally tilled and zero‐tillage treatments were not significant at P < 0.05”
t0“Maize”
Claim · model-written summary
Mulch increased grain yield by 23–46% during drier seasons.
- Treatment
- mulched plotse0
- Outcome
- out‐yieldede0
- Direction
- out‐yieldede0
- Value
- 23–46%e0
- Qualifier
- drier seasonse0
- Comparator
- unmulched plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mulched plots out‐yielded the unmulched plots by 23–46% during the drier seasons.”
t0“Maize”
Claim · model-written summary
Maximum grain yield in tilled‐mulched plots occurred at 123 kg N ha −1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum yields occurred at 123, 139, 130 and 142 kg N ha −1 on the tilled‐mulched, tilled‐unmulched, untilled‐mulched and untilled‐unmulched plots, respectively.”
t0“Maize”
Claim · model-written summary
Nitrogen use efficiency was highest in tilled‐mulched plots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency (grain yield per kg N applied) decreased in the order tilled‐mulched (32.6) > untilled‐mulched (30.9) > untilled‐unmulched (27.8) > tilled‐unmulched (22.4)”
t0“Maize”
Claim · model-written summary
Unmulched plots had higher maximum soil temperature than mulched plots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For each tillage treatment maximum soil temperature was higher and moisture retained at 2 and 10 days after saturation lower on the unmulched than mulched plots.”
t0“Maize”
Claim · model-written summary
Unmulched plots retained less moisture after saturation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For each tillage treatment maximum soil temperature was higher and moisture retained at 2 and 10 days after saturation lower on the unmulched than mulched plots.”
t0“Maize”
Claim · model-written summary
Untilled‐mulched plots had the most residual organic carbon and total N.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The untilled‐mulched plots had the highest contents of residual organic carbon and total N.”
t0“Maize”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
286 papers in the same direction as this paper · 812 in the opposite direction
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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.