Abstract
Tillage influences soil quality via its effects on soil physical, chemical, and biological properties, which in turn affect crop productivity. This study evaluates the effects of conventional (CT) and no-till (NT) systems on (1) soil temperature, bulk density, soil gravimetric water content (GWC), saturated hydraulic conductivity (Ksat), soil organic carbon content (SOC), and total nitrogen (N), and (2) growth and yield of 3 sweet potato (Ipomoea batatas) (L) Lam varieties (87/00/87, ex-Igbariam, and 8164). A field experiment was conducted in 2005 and 2006 on a Typic paleudult in south-eastern Nigeria. The experimental plots comprised 6 treatments (CT 87/00/87 variety, CT ex-Igbariam, CT 8164, NT 87/00/87 variety, NT ex-Igbariam, NT 8164 variety) laid out in the field using randomised complete block design replicated 3 times. Soil temperature was 1–2°C higher in CT plots during early stages of crop development. CT plots had significantly lower soil dry bulk density (1.30–1.35 Mg/m3) than NT plots. Soil GWC was higher, whereas Ksat was lower, in NT plots than CT plots at 35 and 65 days after planting (DAP) for both planting seasons. NT plots had a 0.22–0.26-fold increase in SOC and 16–27% higher N content compared with CT plots at 35 and 65 DAP. The 3 varieties of sweet potato used did not significantly influence soil properties at the different times after planting. Sweet potato yield obtained in CT 87/00/87 variety (21.7–24.9 Mg/ha) for both seasons was higher (P < 0.05) than sweet potato tuber yield obtained from NT ex-Igbariam plots (which had the lowest yield) by about 88%. For each variety, CT plots has significantly higher yield than NT plots. This study showed that although NT practices conserved soil moisture, decreased soil temperature, reduced water infiltration, and increased SOC and soil total N content when compared to CT plots, the reduction in soil compaction at the early stages of crop development (0–65 DAP) in CT plots had a more positive impact on tuber yield and masked the positive effect of other soil productivity parameters for this crop.
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Claims 10
Claim · model-written summary
Conventional tillage soil was 1–2°C warmer early in sweet potato development.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- CT plotse0
- Outcome
- Soil temperaturee0
- Direction
- highere0
- Value
- 1–2°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“sweet potato”
e0“Soil temperature was 1–2°C higher in CT plots during early stages of crop development.”
Claim · model-written summary
Conventional tillage plots had significantly lower soil dry bulk density than no-till plots.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- CT plotse0
- Outcome
- soil dry bulk densitye0
- Direction
- lowere0
- Value
- 1.30–1.35 Mg/m3e0
- Comparator
- NT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“CT plots had significantly lower soil dry bulk density (1.30–1.35 Mg/m3) than NT plots.”
Claim · model-written summary
No-till plots had higher soil gravimetric water content than conventional tillage at 35 and 65 days after planting.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- NT plotse0
- Outcome
- Soil GWCe0
- Direction
- highere0
- Qualifier
- 35 and 65 days after planting (DAP)e0
- Comparator
- CT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“Soil GWC was higher, whereas Ksat was lower, in NT plots than CT plots at 35 and 65 days after planting (DAP) for both planting seasons.”
Claim · model-written summary
No-till plots had lower soil saturated hydraulic conductivity than conventional tillage.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- NT plotse0
- Outcome
- Ksate0
- Direction
- lowere0
- Comparator
- CT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“Soil GWC was higher, whereas Ksat was lower, in NT plots than CT plots at 35 and 65 days after planting (DAP) for both planting seasons.”
Claim · model-written summary
No-till plots had 0.22–0.26-fold greater soil organic carbon than conventional tillage.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- NT plotse0
- Outcome
- SOCe0
- Direction
- increasee0
- Value
- 0.22–0.26-folde0
- Comparator
- CT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“NT plots had a 0.22–0.26-fold increase in SOC and 16–27% higher N content compared with CT plots at 35 and 65 DAP.”
Claim · model-written summary
No-till plots had 16–27% higher soil nitrogen than conventional tillage.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- NT plotse0
- Outcome
- N contente0
- Direction
- highere0
- Value
- 16–27%e0
- Comparator
- CT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“NT plots had a 0.22–0.26-fold increase in SOC and 16–27% higher N content compared with CT plots at 35 and 65 DAP.”
Claim · model-written summary
The three sweet potato varieties did not significantly affect soil properties after planting.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- 3 varietiese0
- Outcome
- soil propertiese0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 3 varieties of sweet potato used did not significantly influence soil properties at the different times after planting.”
Claim · model-written summary
Conventional tillage with sweet potato variety 87/00/87 yielded 21.7–24.9 Mg/ha, about 88% above no-till ex-Igbariam.
- Taxon
- Sweet potatoIpomoea batatase0
- Material
- 87/00/87e0
- Treatment
- CTe0
- Outcome
- Sweet potato yielde0
- Direction
- highere0
- Value
- 21.7–24.9 Mg/hae0
- Qualifier
- about 88%e0
- Comparator
- NT ex-Igbariam plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sweet potato yield obtained in CT 87/00/87 variety (21.7–24.9 Mg/ha) for both seasons was higher (P < 0.05) than sweet potato tuber yield obtained from NT ex-Igbariam plots (which had the lowest yield) by about 88%.”
Claim · model-written summary
For each sweet potato variety, conventional tillage gave significantly higher yield than no-till.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- CT plotse0
- Outcome
- yielde0
- Direction
- highere0
- Comparator
- NT plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“For each variety, CT plots has significantly higher yield than NT plots.”
Claim · model-written summary
The authors attribute the conventional tillage yield advantage to lower early soil compaction.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- CT plotse0
- Outcome
- tuber yielde0
- Qualifier
- reduction in soil compactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweet potato”
e0“the reduction in soil compaction at the early stages of crop development (0–65 DAP) in CT plots had a more positive impact on tuber yield and masked the positive effect of other soil productivity parameters for this crop.”
The same questions in other papers
tillage · yield · Ipomoea batatas (sweet potato)Positive and negative results
6 papers in the same direction as this paper · 2 reporting no difference from an alternative
- positive
- positive
- no effect
5 papers more in this group
See all 9 papers →tillage · nutrient: content · Ipomoea batatas (sweet potato)Results agree
2 papers in the same direction as this paper
- positive
- positive
tillage · soil: physics · Ipomoea batatas (sweet potato)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.