Abstract
A three years' trial was conducted in a farmers' field in northern Ghana to evaluate the effect of sole crops (cotton, cowpea, groundnut, soybean, and sunflower) planted once or twice on yield of the staple foods of the region, maize and sorghum. Sole cropping for only one year already resulted in significant yield increases for maize and partly for sorghum compared to the conventional cropping of mixed stands of maize–sorghum or maize–groundnut and natural fallow. Lowest yield of maize and sorghum was obtained where these cereals followed maize–sorghum (monoculture). Intercropping of maize with groundnut led to subsequent maize and sorghum yields which were similar to those obtained after maize–sorghum. After growing legumes and sunflower for one year the grain and straw yield of maize and sorghum was significantly higher in the two consecutive years than after cereal (maize–sorghum) monoculture. In this trial maize and sorghum were found to be not as tolerant to the disadvantages of monoculture or preceding cereals–legumes mixture. The results suggest that continuous intercropping with cereals under the given conditions has negative effects on soil fertility and can lead to an increase in soil-borne pests and troublesome weeds like Striga comparable to monocropped cereals.
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Claims 12
Claim · model-written summary
One year of sole cropping significantly increased maize yield compared with conventional mixed stands of maize–sorghum or maize–groundnut and natural fallow.
- Treatment
- Sole cropping for only one yeare0
- Outcome
- yielde0
- Direction
- increasese0
- Comparator
- conventional cropping of mixed stands of maize–sorghum or maize–groundnut and natural fallowe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sole cropping for only one year already resulted in significant yield increases for maize and partly for sorghum compared to the conventional cropping of mixed stands of maize–sorghum or maize–groundnut and natural fallow”
Claim · model-written summary
One year of sole cropping partly increased sorghum yield significantly compared with conventional mixed stands of maize–sorghum or maize–groundnut and natural fallow.
- Treatment
- Sole cropping for only one yeare0
- Outcome
- yielde0
- Direction
- increasese0
- Qualifier
- partlye0
- Comparator
- conventional cropping of mixed stands of maize–sorghum or maize–groundnut and natural fallowe0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sole cropping for only one year already resulted in significant yield increases for maize and partly for sorghum compared to the conventional cropping of mixed stands of maize–sorghum or maize–groundnut and natural fallow”
Claim · model-written summary
Maize yield was lowest where maize followed maize–sorghum monoculture.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowest yield of maize and sorghum was obtained where these cereals followed maize–sorghum (monoculture)”
Claim · model-written summary
Sorghum yield was lowest where sorghum followed maize–sorghum monoculture.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowest yield of maize and sorghum was obtained where these cereals followed maize–sorghum (monoculture)”
Claim · model-written summary
Intercropping maize with groundnut led to subsequent maize yields similar to those after maize–sorghum.
- Treatment
- Intercropping of maize with groundnute0
- Outcome
- yieldse0
- Direction
- similare0
- Comparator
- maize–sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercropping of maize with groundnut led to subsequent maize and sorghum yields which were similar to those obtained after maize–sorghum”
Claim · model-written summary
Intercropping maize with groundnut led to subsequent sorghum yields similar to those after maize–sorghum.
- Treatment
- Intercropping of maize with groundnute0
- Outcome
- yieldse0
- Direction
- similare0
- Comparator
- maize–sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercropping of maize with groundnut led to subsequent maize and sorghum yields which were similar to those obtained after maize–sorghum”
Claim · model-written summary
After one year of legumes and sunflower, maize grain and straw yield was significantly higher in the two following years than after cereal maize–sorghum monoculture.
- Treatment
- After growing legumes and sunflower for one yeare0
- Outcome
- grain and straw yielde0
- Direction
- highere0
- Comparator
- cereal (maize–sorghum) monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After growing legumes and sunflower for one year the grain and straw yield of maize and sorghum was significantly higher in the two consecutive years than after cereal (maize–sorghum) monoculture”
Claim · model-written summary
After one year of legumes and sunflower, sorghum grain and straw yield was significantly higher in the two following years than after cereal maize–sorghum monoculture.
- Treatment
- After growing legumes and sunflower for one yeare0
- Outcome
- grain and straw yielde0
- Direction
- highere0
- Comparator
- cereal (maize–sorghum) monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After growing legumes and sunflower for one year the grain and straw yield of maize and sorghum was significantly higher in the two consecutive years than after cereal (maize–sorghum) monoculture”
Claim · model-written summary
Maize and sorghum were found to be less tolerant to the disadvantages of monoculture or a preceding cereal–legume mixture.
- Outcome
- not as tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize and sorghum were found to be not as tolerant to the disadvantages of monoculture or preceding cereals–legumes mixture”
Claim · model-written summary
The authors suggest that continuous intercropping with cereals has negative effects on soil fertility under the given conditions.
- Taxon
- cerealse0
- Treatment
- continuous intercropping with cerealse0
- Outcome
- soil fertilitye0
- Direction
- negative effectse0
- Qualifier
- under the given conditionse0
Not reportedComparator
Verbatim
e0“continuous intercropping with cereals under the given conditions has negative effects on soil fertility and can lead to an increase in soil-borne pests and troublesome weeds like Striga comparable to monocropped cereals”
Claim · model-written summary
The authors suggest that continuous intercropping with cereals can increase soil-borne pests, comparably to monocropped cereals.
Verbatim
e0“continuous intercropping with cereals under the given conditions has negative effects on soil fertility and can lead to an increase in soil-borne pests and troublesome weeds like Striga comparable to monocropped cereals”
Claim · model-written summary
The authors suggest that continuous intercropping with cereals can increase troublesome weeds like Striga, comparably to monocropped cereals.
- Taxon
- cerealse0
- Treatment
- continuous intercropping with cerealse0
- Outcome
- troublesome weeds like Strigae0
- Direction
- increasee0
- Comparator
- monocropped cerealse0
StrigaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous intercropping with cereals under the given conditions has negative effects on soil fertility and can lead to an increase in soil-borne pests and troublesome weeds like Striga comparable to monocropped cereals”
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