Abstract
Striga species (witchweed) are considered the greatest biological constraint upon food crop production in sub-Saharan Africa. Erratic field infestation is known to be one of the major bottlenecks to achieving progress in Striga research worldwide. This study reports observations of Striga infestations in 21 locations consisting of 12 research stations, 7 commercial farms and 2 small-scale farms in five countries of West and Central Africa. The observations were carried out for a period of two to five years between 1982 and 1994. Eighteen locations included S. hermonthica, two S. aspera and one S. asiatica . The results obtained from these observations suggests that the > continuous cropping of maize and high N application ( 120 kg ha-1) reduced Striga infestation significantly within five years. Only artificial > inoculation with a large quantity of Striga seed ( 3000 germinable < seeds per maize plant), low N application ( 30 kg ha-1) and ridge slowing sustained high Striga infestation. Apparently, low N application and a sorghum dominated farming system was a major cause of high Striga infestation in West and Central Africa.
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Claims 7
Claim · model-written summary
Continuous cropping of maize significantly reduced Striga infestation within five years.
- Treatment
- continuous cropping of maizee1
- Outcome
- Striga infestatione1
- Direction
- reducede1
- Qualifier
- within five yearse1
Zea mays
StrigaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“continuous cropping of maize and high N application ( 120 kg ha-1) reduced Striga infestation significantly within five years”
Claim · model-written summary
High N application (120 kg per ha) significantly reduced Striga infestation within five years.
- Treatment
- high N application ( 120 kg ha-1)e1
- Outcome
- Striga infestatione1
- Direction
- reducede1
- Qualifier
- within five yearse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“continuous cropping of maize and high N application ( 120 kg ha-1) reduced Striga infestation significantly within five years”
Claim · model-written summary
Only artificial inoculation with a large quantity of Striga seed sustained high Striga infestation.
- Treatment
- inoculation with a large quantity of Striga seed ( 3000 germinable < seeds per maize plant)e1
- Outcome
- Striga infestatione2
- Direction
- higherinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“artificial > inoculation with a large quantity of Striga seed ( 3000 germinable < seeds per maize plant)”
e2“sustained high Striga infestation”
Claim · model-written summary
Low N application (30 kg per ha) sustained high Striga infestation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“low N application ( 30 kg ha-1)”
e2“sustained high Striga infestation”
Claim · model-written summary
Ridge (planting on ridges) sustained high Striga infestation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“ridge slowing sustained high Striga infestation”
Claim · model-written summary
Low N application was apparently a major cause of high Striga infestation in West and Central Africa.
- Treatment
- low N applicatione1
- Outcome
- high Striga infestatione1
- Qualifier
- major causee1
- Setting
- West and Central Africae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“low N application and a sorghum dominated farming system was a major cause of high Striga infestation in West and Central Africa”
Claim · model-written summary
A sorghum dominated farming system was apparently a major cause of high Striga infestation in West and Central Africa.
- Treatment
- sorghum dominated farming systeme1
- Outcome
- high Striga infestatione1
- Qualifier
- major causee1
- Setting
- West and Central Africae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize”
e1“low N application and a sorghum dominated farming system was a major cause of high Striga infestation in West and Central Africa”
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