Abstract
To assess changes of some physical properties of an Ultisol under slash-and-burn practice, an experiment was conducted after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon. Four levels of biomass burn were considered: (i) slight burn (SB), (ii) moderate burn (MB) and (iii) heavy burn (HB) versus (iv) control or noburn (NB), corresponding to 30, 55 and 100 kg/m2 dry biomass; the control consisting of 30 kg/m2 dry biomass without burn. The biomass of the rest of treatments was burned once before the beginning of the cropping season. The experiment was set up in a randomised complete block design (RCBD) with eight replications. At the conclusion of this study, it wasfound that at 0 – 10 cm soil depth, moisture content on the heavy burn was significantly the highest (P less than 0.05) during the first cropping period, but decreased to be the least compared to the no-burn during the second cropping period. Moreover, the saturated hydraulic conductivity (6.6 – 3.2 cm / sec) between 5 and 25 cm depths and infiltration rates at 0.5 minute during the first year were significantly the highest on heavy burn compared to other treatments. However, during the second year, steady state infiltration was the highest on no burn. Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn. Burning appeared beneficial to both soil water movement and crop yield although with temporary effects. To maintain soil productivity, leguminous species were suggested to protect the soil from leaching and erosion and to improve both soil physical and chemical conditions.
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Claims 11
Claim · model-written summary
Moderate burning increased cassava yield by 9% over no burn.
- Taxon
- cassava
Manihot esculentae4 - Treatment
- moderate burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 9e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Slight burning increased cassava yield by 15% over no burn.
- Taxon
- cassavaManihot esculentae4
- Treatment
- slight burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 15e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Heavy burning increased cassava yield by 27% over no burn.
- Taxon
- cassavaManihot esculentae4
- Treatment
- heavy burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 27%e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Moderate burning increased groundnut yield by 41% over no burn.
- Taxon
- groundnut
Arachis hypogaeae4 - Treatment
- moderate burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 41e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Slight burning increased groundnut yield by 116% over no burn.
- Taxon
- groundnutArachis hypogaeae4
- Treatment
- slight burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 116e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Heavy burning increased groundnut yield by 223% over no burn.
- Taxon
- groundnutArachis hypogaeae4
- Treatment
- heavy burne4
- Outcome
- yieldse4
- Direction
- increasese4
- Value
- 223 %e4
- Comparator
- no burne4
- Setting
- Mbalmayoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after clearing and burning a secondary forest in Mbalmayo (3°51’N and 11°27’E), Cameroon”
e4“Significantly higher yields were found on burned plots, with 9, 15 and 27% increases for cassava and 41, 116 and 223 % for groundnut, respectively in the moderate burn, slight burn and heavy burn over no burn”
Claim · model-written summary
Heavy burning gave the highest moisture content at 0–10 cm depth in the first cropping period.
- Treatment
- heavy burne5
- Outcome
- moisture contente5
- Direction
- the higheste5
- Qualifier
- during the first cropping periode5
Not reportedTaxonComparator
Verbatim
e5“moisture content on the heavy burn was significantly the highest (P less than 0.05) during the first cropping period”
Claim · model-written summary
Heavy burning gave the highest saturated hydraulic conductivity between 5 and 25 cm depth.
- Treatment
- heavy burne6
- Outcome
- saturated hydraulic conductivitye6
- Direction
- significantly the higheste6
- Value
- 6.6 – 3.2 cm / sece6
- Qualifier
- between 5 and 25 cm depthse6
- Comparator
- other treatmentse6
Not reportedTaxon
Verbatim
e6“the saturated hydraulic conductivity (6.6 – 3.2 cm / sec) between 5 and 25 cm depths and infiltration rates at 0.5 minute during the first year were significantly the highest on heavy burn compared to other treatments”
Claim · model-written summary
Heavy burning gave the highest infiltration rate at 0.5 minute in the first year.
- Treatment
- heavy burne6
- Outcome
- infiltration rates at 0.5 minutee6
- Direction
- significantly the higheste6
- Qualifier
- during the first yeare6
- Comparator
- other treatmentse6
Not reportedTaxon
Verbatim
e6“the saturated hydraulic conductivity (6.6 – 3.2 cm / sec) between 5 and 25 cm depths and infiltration rates at 0.5 minute during the first year were significantly the highest on heavy burn compared to other treatments”
Claim · model-written summary
No burn gave the highest steady-state infiltration in the second year.
- Treatment
- no burne7
- Outcome
- steady state infiltratione7
- Direction
- the higheste7
- Qualifier
- during the second yeare7
Not reportedTaxonComparator
Verbatim
e7“However, during the second year, steady state infiltration was the highest on no burn”
Claim · model-written summary
The authors suggest leguminous species to protect soil from leaching and erosion.
Verbatim
e2“leguminous species were suggested to protect the soil from leaching and erosion”
The same questions in other papers
fire · yield · Arachis hypogaea (peanut)Results agree
2 papers in the same direction as this paper
- positive
- positive
fire · yield · Manihot esculenta (cassava)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.