Abstract
Genotype by environment interaction results in significant differences in the performance of cultivars when tested in diverse environments. Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars obtained from International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria and a local check were evaluated for growth, reproductive and grain yield components in a non-traditional cowpea growing region of south eastern Nigeria with the aim of identifying high yielding genotypes and optimum planting date. The study was conducted in two locations namely Mgbakwu (06°17ʹN, 07°04ʹE; 83 masl) and Ishiagu (05°58ʹN, 07°34ʹE; 197 masl) across two years and two seasons in each year. A split-plot design was used with three replications. The results indicated that early planting date gave significantly higher yield and yield components than late planting date in both years and locations. IT 98K-131-2 produced mean grain yield of 1220 kg ha-1 in early planting date and 732 kg ha-1 in late season planting in Ishiagu, while in Mgbakwu, it produced 921 and 326 kg ha-1 in early and late planting dates, respectively. IT 97K-556-4 on the other hand produced mean grain yield of 1154 and 424 kg ha-1 in early and late planting dates, respectively in Ishiagu; while in Mgbakwu, the mean grain yield were 1594 and 251 kg ha-1 for early and late planting dates, respectively. IT 98K-131-2 exhibited the highest mean grain yield attributes in all the environments, indicating broad adaptation; while IT 97K-556-4 was the next highest grain yielder with specific adaptation to early season in Mgbakwu. The two cultivars are therefore recommended to farmers for multiplication and general cultivation in south eastern Nigeria. Key words: Cowpea, growth and yield components, planting date.
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Claims 8
Claim · model-written summary
Early planting gave significantly higher cowpea yield and yield components than late planting in both years and locations.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- early planting datee1
- Outcome
- yield and yield componentse1
- Direction
- highere1
- Comparator
- late planting datee1
- Setting
- in both years and locationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e1“early planting date gave significantly higher yield and yield components than late planting date in both years and locations”
Claim · model-written summary
IT 98K-131-2 gave higher mean grain yield in early than in late planting at Ishiagu.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT 98K-131-2e2
- Treatment
- early planting datee2
- Outcome
- mean grain yielde2
- Direction
- higherinferrede2
- Value
- 1220 kg ha-1e2
- Qualifier
- 732 kg ha-1e2
- Comparator
- late season plantinge2
- Setting
- Ishiague2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e2“IT 98K-131-2 produced mean grain yield of 1220 kg ha-1 in early planting date and 732 kg ha-1 in late season planting in Ishiagu”
Claim · model-written summary
IT 98K-131-2 gave higher mean grain yield in early than in late planting at Mgbakwu.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- earlye3
- Outcome
- producede3
- Direction
- higherinferrede3
- Value
- 921 and 326 kg ha-1e3
- Comparator
- late planting datese3
- Setting
- Mgbakwue3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e3“while in Mgbakwu, it produced 921 and 326 kg ha-1 in early and late planting dates, respectively”
Claim · model-written summary
IT 97K-556-4 gave higher mean grain yield in early than in late planting at Ishiagu.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT 97K-556-4e4
- Treatment
- earlye4
- Outcome
- mean grain yielde4
- Direction
- higherinferrede4
- Value
- 1154 and 424 kg ha-1e4
- Comparator
- late planting datese4
- Setting
- Ishiague4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e4“IT 97K-556-4 on the other hand produced mean grain yield of 1154 and 424 kg ha-1 in early and late planting dates, respectively in Ishiagu”
Claim · model-written summary
IT 97K-556-4 gave higher mean grain yield in early than in late planting at Mgbakwu.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- earlye5
- Outcome
- mean grain yielde5
- Direction
- higherinferrede5
- Value
- 1594 and 251 kg ha-1e5
- Comparator
- late planting datese5
- Setting
- Mgbakwue5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e5“while in Mgbakwu, the mean grain yield were 1594 and 251 kg ha-1 for early and late planting dates, respectively”
Claim · model-written summary
IT 98K-131-2 had the highest mean grain yield in all environments, indicating broad adaptation.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT 98K-131-2e6
- Outcome
- highest mean grain yield attributese6
- Qualifier
- indicating broad adaptatione6
- Setting
- all the environmentse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e6“IT 98K-131-2 exhibited the highest mean grain yield attributes in all the environments, indicating broad adaptation”
Claim · model-written summary
IT 97K-556-4 was the next highest grain yielder, with specific adaptation to early season in Mgbakwu.
- Taxon
- cowpeaVigna unguiculatae0
- Material
- IT 97K-556-4e7
- Outcome
- specific adaptation to early seasone7
- Setting
- Mgbakwue7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e7“IT 97K-556-4 was the next highest grain yielder with specific adaptation to early season in Mgbakwu”
Claim · model-written summary
The two cultivars are recommended to farmers for multiplication and general cultivation in south eastern Nigeria.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- multiplication and general cultivatione5
- Setting
- south eastern Nigeriae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine improved cowpea (Vigna unguiculata (L.) Walp) cultivars”
e5“The two cultivars are therefore recommended to farmers for multiplication and general cultivation in south eastern Nigeria”
The same questions in other papers
sowing time · yield · Vigna unguiculata (cowpea)Positive and negative results
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See all 31 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.