Abstract
SUMMARY The growth and yield of maize grown on an unploughed newly opened secondary forest in Nigeria in 1985–87 was studied. In each year, trash was either removed or burnt in situ and each of these treatments was given N fertilizer or none. In the first year, only N fertilizer increased yields. In the second and third years, yields were increased by N fertilizer and by trash burning. Trash burning consistently increased the amount of P in the soil.
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Claims 4
Claim · model-written summary
In the first year, N fertilizer alone increased maize yields on newly opened secondary forest land in Nigeria.
- Treatment
- N fertilizere1
- Outcome
- yieldse1
- Direction
- increasede1
- Qualifier
- In the first yeare1
- Comparator
- nonee2
- Setting
- newly opened secondary forest in Nigeriae0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth and yield of maize grown on an unploughed newly opened secondary forest in Nigeria in 1985–87 was studied”
e1“In the first year, only N fertilizer increased yields”
e2“each of these treatments was given N fertilizer or none”
Claim · model-written summary
In the second and third years, N fertilizer increased maize yields on newly opened secondary forest land in Nigeria.
- Treatment
- N fertilizere3
- Outcome
- yieldse3
- Direction
- increasede3
- Qualifier
- In the second and third yearse3
- Comparator
- nonee2
- Setting
- newly opened secondary forest in Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth and yield of maize grown on an unploughed newly opened secondary forest in Nigeria in 1985–87 was studied”
e2“each of these treatments was given N fertilizer or none”
e3“In the second and third years, yields were increased by N fertilizer and by trash burning”
Claim · model-written summary
In the second and third years, trash burning increased maize yields compared with trash removal.
- Treatment
- trash burninge3
- Outcome
- yieldse3
- Direction
- increasede3
- Qualifier
- In the second and third yearse3
- Comparator
- removede4
- Setting
- newly opened secondary forest in Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth and yield of maize grown on an unploughed newly opened secondary forest in Nigeria in 1985–87 was studied”
e3“In the second and third years, yields were increased by N fertilizer and by trash burning”
e4“trash was either removed or burnt in situ”
Claim · model-written summary
Trash burning consistently increased the amount of soil P compared with trash removal.
- Treatment
- Trash burninge5
- Outcome
- amount of P in the soile5
- Direction
- increasede5
- Qualifier
- consistentlye5
- Comparator
- removede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth and yield of maize grown on an unploughed newly opened secondary forest in Nigeria in 1985–87 was studied”
e4“trash was either removed or burnt in situ”
e5“Trash burning consistently increased the amount of P in the soil”
The same questions in other papers
fire · yield · Zea mays (maize)Results differ
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- no effect
- no effect
- negative
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3,484 papers in the same direction as this paper · 338 in the opposite direction · 85 reporting no difference from an alternative
- positive
- positive
- negative
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See all 3,908 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.