Abstract
On-farm trials were conducted in 2001, 2002, and 2003 in the northern Guinea savanna of Nigeria to evaluate integrated Striga hermonthica control measures under farmermanaged conditions. These included intercropping a Striga-resistant maize variety with cowpea for 3 years and also cropping this maize in rotation with legume trap crops - soybean and cowpea for 1-2 two years. Intercropping Striga-tolerant maize variety, Acr. 97TZL Comp. 1-W, with cowpea (Vigna unguiculata L.) consistently reduced Striga infestation in maize relative to continuously cropped sole maize over the threeyear period. Maize grain yield was lower in the intercrop than in the sole maize plot probably due to competition from cowpea. However, because of the high value of cowpea in the intercrop, crop value for this system was higher than sole cropped maize. Legume-maize rotation reduced Striga infestation by 35% after one year of legumes in the rotation and by 76% after two years of legumes in the rotation. Soybean was more effective in reducing Striga infestation and also gave higher maize grain yield than cowpea. The rotation of these two legumes with maize had clear advantage over continuously cropped maize. Farmers should therefore be encouraged to adopt the introduction of grain legumes into the cereal cropping systems of the Nigerian savanna.
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Claims 9
Claim · model-written summary
Intercropping Striga-tolerant maize with cowpea consistently reduced Striga infestation relative to continuously cropped sole maize.
- Treatment
- Intercropping Striga-tolerant maize variety, Acr. 97TZL Comp. 1-W, with cowpeae1
- Interactor
- Striga hermonthica
Striga hermonthicae3parasite - Outcome
- Striga infestatione1
- Direction
- reducede1
- Qualifier
- consistentlye1
- Comparator
- continuously cropped sole maizee1
- Setting
- northern Guinea savanna of Nigeriae2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Intercropping Striga-tolerant maize variety, Acr. 97TZL Comp. 1-W, with cowpea (Vigna unguiculata L.) consistently reduced Striga infestation in maize relative to continuously cropped sole maize over the threeyear period”
e2“On-farm trials were conducted in 2001, 2002, and 2003 in the northern Guinea savanna of Nigeria”
e3“to evaluate integrated Striga hermonthica control measures”
Claim · model-written summary
Maize grain yield was lower in the intercrop with cowpea than in sole maize, probably due to competition from cowpea.
- Treatment
- Intercropping Striga-tolerant maize variety, Acr. 97TZL Comp. 1-W, with cowpeae1
- Outcome
- Maize grain yielde2
- Direction
- lowere2
- Qualifier
- probably due to competition from cowpeae2
- Comparator
- sole maizee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Intercropping Striga-tolerant maize variety, Acr. 97TZL Comp. 1-W, with cowpea (Vigna unguiculata L.) consistently reduced Striga infestation in maize relative to continuously cropped sole maize over the threeyear period”
e2“Maize grain yield was lower in the intercrop than in the sole maize plot probably due to competition from cowpea”
Claim · model-written summary
Crop value of the maize-cowpea intercrop was higher than that of sole maize.
- Treatment
- cowpea in the intercrope3
- Outcome
- crop valuee3
- Direction
- highere3
- Comparator
- sole cropped maizee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“However, because of the high value of cowpea in the intercrop, crop value for this system was higher than sole cropped maize”
Claim · model-written summary
Legume-maize rotation reduced Striga infestation by 35% after one year of legumes in the rotation.
- Treatment
- legumes in the rotatione4
- Interactor
- Striga hermonthicaStriga hermonthicae6parasite
- Outcome
- Striga infestatione4
- Direction
- reducede4
- Value
- 35%e4
- Comparator
- continuously cropped maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Legume-maize rotation reduced Striga infestation by 35% after one year of legumes in the rotation and by 76% after two years of legumes in the rotation”
e5“The rotation of these two legumes with maize had clear advantage over continuously cropped maize”
e6“to evaluate integrated Striga hermonthica control measures”
Claim · model-written summary
Legume-maize rotation reduced Striga infestation by 76% after two years of legumes in the rotation.
- Treatment
- two years of legumes in the rotatione4
- Interactor
- Striga hermonthicaStriga hermonthicae6parasite
- Outcome
- Striga infestatione4
- Direction
- reducede4
- Value
- 76%e4
- Comparator
- continuously cropped maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Legume-maize rotation reduced Striga infestation by 35% after one year of legumes in the rotation and by 76% after two years of legumes in the rotation”
e5“The rotation of these two legumes with maize had clear advantage over continuously cropped maize”
e6“to evaluate integrated Striga hermonthica control measures”
Claim · model-written summary
Rotation of the two legumes with maize had a clear advantage over continuously cropped maize.
- Treatment
- rotation of these two legumes with maizee5
- Outcome
- advantagee5
- Direction
- clear advantagee5
- Comparator
- continuously cropped maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The rotation of these two legumes with maize had clear advantage over continuously cropped maize”
Claim · model-written summary
Soybean was more effective than cowpea in reducing Striga infestation.
- Taxon
- Soybean
Glycine maxe6 - Treatment
- Soybeane6
- Interactor
- Striga hermonthicaStriga hermonthicae7parasite
- Outcome
- Striga infestatione6
- Direction
- more effective in reducinge6
- Comparator
- cowpeae6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Soybean was more effective in reducing Striga infestation and also gave higher maize grain yield than cowpea”
e7“to evaluate integrated Striga hermonthica control measures”
Claim · model-written summary
Soybean gave higher maize grain yield than cowpea.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Soybean was more effective in reducing Striga infestation and also gave higher maize grain yield than cowpea”
Claim · model-written summary
Farmers should be encouraged to introduce grain legumes into cereal cropping systems in the Nigerian savanna.
Verbatim
e7“Farmers should therefore be encouraged to adopt the introduction of grain legumes into the cereal cropping systems of the Nigerian savanna”
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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.