Abstract
Conservation agriculture (CA), which could contribute to sustainable agriculture, maintains or improves soil nitrogen fertility by eliminating tillage (no-tillage). Quantitative assessment of soil constituents is enhanced by stable isotope techniques such as 15N, which are used to better understand nitrogen dynamics. This study was therefore carried out to assess the impact of tillage type and fertilizer application on soil and plant nitrogen fractionation. The trial consisted of two tillage types: no-tillage (NT) and conventional tillage (CT). Three nitrogen doses (82, 115, and 149 kg ha−1) were applied. The experimental design was a randomized complete block with three replications. The Louiza variety of durum wheat was used in this study. Soil nitrogen sequestration was assessed using the stable nitrogen isotope (15N) method. The statistical analysis (ANOVA) showed that, overall, there was no significant difference between tillage types and nitrogen doses for grain and straw yields and grain total nitrogen. In contrast, the effect of both factors and their interaction were significant for straw total nitrogen. There was no difference between tillage types for grain nitrogen use efficiency (NUE), even though NT was superior to CT by 3.5%, but nitrogen doses had a significant effect and a significant interaction with tillage type. When comparing nitrogen doses for each tillage type separately, results showed that the average NUE for grain was 20.5, 8.4, and 16.5%, respectively, for the three nitrogen doses for CT compared with 26.8, 19.0, and 30.6% for NT, indicating clearly the better performance of NT compared to CT. Regarding straw, the NUE is 3.2, 3.5, and 5.4% for CT compared with 3.4, 4.9, and 9.2% for NT. NUE in grain and straw under no-tillage was higher than under conventional tillage in all three nitrogen doses. These results show that soil conservation techniques such as no-tillage and the integrated application of nitrogen fertilizer can be good strategies for reducing soil nitrogen losses.
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Claims 9
Claim · model-written summary
Tillage type and nitrogen dose had no significant overall differences in wheat grain and straw yields and grain total nitrogen.
- Taxon
- durum wheat
Triticum turgidum subsp. durume1 - Treatment
- tillage types and nitrogen dosese0
- Outcome
- grain and straw yields and grain total nitrogene0
- Direction
- no significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant difference between tillage types and nitrogen doses for grain and straw yields and grain total nitrogen”
e1“The Louiza variety of durum wheat was used”
Claim · model-written summary
Tillage, nitrogen dose, and their interaction significantly affected wheat straw total nitrogen.
- Taxon
- durum wheatTriticum turgidum subsp. durume2
- Treatment
- tillage types and nitrogen dosese1
- Outcome
- straw total nitrogene0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of both factors and their interaction were significant for straw total nitrogen”
e1“tillage types and nitrogen doses”
e2“The Louiza variety of durum wheat was used”
Claim · model-written summary
Grain nitrogen use efficiency did not differ by tillage type although no-tillage was 3.5% higher.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Treatment
- NTe0
- Outcome
- grain nitrogen use efficiencye0
- Direction
- no differencee0
- Value
- 3.5%e0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference between tillage types for grain nitrogen use efficiency (NUE), even though NT was superior to CT by 3.5%”
e1“The Louiza variety of durum wheat was used”
Claim · model-written summary
Nitrogen dose and its interaction with tillage significantly affected grain nitrogen use efficiency.
- Taxon
- durum wheatTriticum turgidum subsp. durume2
- Treatment
- nitrogen dosese0
- Outcome
- grain nitrogen use efficiencye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen doses had a significant effect and a significant interaction with tillage type”
e1“for grain nitrogen use efficiency (NUE)”
e2“The Louiza variety of durum wheat was used”
Claim · model-written summary
At 82 kg ha−1 nitrogen, grain NUE was 26.8% with no-tillage versus 20.5% with conventional tillage.
- Taxon
- durum wheatTriticum turgidum subsp. durume2
- Treatment
- NTe0
- Outcome
- NUE for graine0
- Direction
- compared withe0
- Value
- 26.8e0
- Qualifier
- 82e1
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average NUE for grain was 20.5, 8.4, and 16.5%, respectively, for the three nitrogen doses for CT compared with 26.8, 19.0, and 30.6% for NT”
e1“Three nitrogen doses (82, 115, and 149 kg ha−1) were applied”
e2“The Louiza variety of durum wheat was used”
Claim · model-written summary
At 115 kg ha−1 nitrogen, grain NUE was 19.0% with no-tillage versus 8.4% with conventional tillage.
- Taxon
- durum wheatTriticum turgidum subsp. durume2
- Treatment
- NTe0
- Outcome
- NUE for graine0
- Direction
- compared withe0
- Value
- 19.0e0
- Qualifier
- 115e1
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average NUE for grain was 20.5, 8.4, and 16.5%, respectively, for the three nitrogen doses for CT compared with 26.8, 19.0, and 30.6% for NT”
e1“Three nitrogen doses (82, 115, and 149 kg ha−1) were applied”
e2“The Louiza variety of durum wheat was used”
Claim · model-written summary
At 149 kg ha−1 nitrogen, grain NUE was 30.6% with no-tillage versus 16.5% with conventional tillage.
- Taxon
- durum wheatTriticum turgidum subsp. durume2
- Treatment
- NTe0
- Outcome
- NUE for graine0
- Direction
- compared withe0
- Value
- 30.6%e0
- Qualifier
- 149 kg ha−1e1
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average NUE for grain was 20.5, 8.4, and 16.5%, respectively, for the three nitrogen doses for CT compared with 26.8, 19.0, and 30.6% for NT”
e1“Three nitrogen doses (82, 115, and 149 kg ha−1) were applied”
e2“The Louiza variety of durum wheat was used”
Claim · model-written summary
At the three nitrogen rates, straw NUE under no-tillage was 3.4%, 4.9%, and 9.2%, versus 3.2%, 3.5%, and 5.4% under conventional tillage.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Treatment
- NTe0
- Outcome
- straw, the NUEe0
- Direction
- highere2
- Value
- 3.4, 4.9, and 9.2%e0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding straw, the NUE is 3.2, 3.5, and 5.4% for CT compared with 3.4, 4.9, and 9.2% for NT”
e1“The Louiza variety of durum wheat was used”
e2“NUE in grain and straw under no-tillage was higher than under conventional tillage in all three nitrogen doses”
Claim · model-written summary
The authors recommend no-tillage with nitrogen fertilizer as a strategy to reduce soil nitrogen losses.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Treatment
- no-tillage and the integrated application of nitrogen fertilizere0
- Outcome
- reducing soil nitrogen lossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil conservation techniques such as no-tillage and the integrated application of nitrogen fertilizer can be good strategies for reducing soil nitrogen losses”
e1“The Louiza variety of durum wheat was used”
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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.