Performance of informal market sweet potato cultivars in on-farm trials in South Africa
Several new sweet potato cultivars have been released in South Africa from 2004 until 2011 with varietal traits suitable for the informal market. This paper reports on results of on-farm trials conducted to evaluate the cultivars in broader agro-ecologies in the country. The trials were conducted at...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2017-08-01
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| Series: | Open Agriculture |
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| Online Access: | https://doi.org/10.1515/opag-2017-0047 |
| _version_ | 1818677598348115968 |
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| author | Laurie Sunette Calitz Frikkie Mtileni Musa Mphela Whelma Tjale Sidwell |
| author_facet | Laurie Sunette Calitz Frikkie Mtileni Musa Mphela Whelma Tjale Sidwell |
| author_sort | Laurie Sunette |
| collection | DOAJ |
| description | Several new sweet potato cultivars have been released in South Africa from 2004 until 2011 with varietal traits suitable for the informal market. This paper reports on results of on-farm trials conducted to evaluate the cultivars in broader agro-ecologies in the country. The trials were conducted at 15 localities across the 2011/12 to 2014/15 planting seasons including six cultivars with varying flesh colours. Data collection included marketable and unmarketable storage root yield classes, dry mass, and taste acceptability. The sites were representative of cool subtropical and warm temperate regions. Statistical analysis included ANOVA, AMMI, Discriminant analysis (DA) and Principal component analysis (PCA). Significant effects were detected for locality*cultivar and region*cultivar interactions for total and marketable yield, and for cultivar only for marketable yield. The factor region was not significant. The mean marketable yield ranged from 13.1 to 19.0 t/ha, being highest for 199062.1 and Ndou, while Bophelo had average stable yield over a broad range of environments. The most prevalent unmarketable class was weevil damage (15.1%). The study demonstrated PCA and DA as quick analytical tools to associate quality traits with cultivars to facilitate cultivar recommendations. Bophelo and Ndou had been sold with success on local informal markets and have large potential to be promoted wider. |
| first_indexed | 2024-12-17T09:01:55Z |
| format | Article |
| id | doaj.art-4fd2c415a68c4fca865e3f1ed189fe55 |
| institution | Directory Open Access Journal |
| issn | 2391-9531 |
| language | English |
| last_indexed | 2024-12-17T09:01:55Z |
| publishDate | 2017-08-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Agriculture |
| spelling | doaj.art-4fd2c415a68c4fca865e3f1ed189fe552022-12-21T21:55:41ZengDe GruyterOpen Agriculture2391-95312017-08-012143144110.1515/opag-2017-0047opag-2017-0047Performance of informal market sweet potato cultivars in on-farm trials in South AfricaLaurie Sunette0Calitz Frikkie1Mtileni Musa2Mphela Whelma3Tjale Sidwell4Agricultural Research Council-Vegetable and Ornamental Plants (ARC-VOP), Pretoria, South AfricaAgricultural Research Council-Biometry, Pretoria, South AfricaAgricultural Research Council-Vegetable and Ornamental Plants (ARC-VOP), Pretoria, South AfricaAgricultural Research Council-Vegetable and Ornamental Plants (ARC-VOP), Pretoria, South AfricaAgricultural Research Council-Vegetable and Ornamental Plants (ARC-VOP), Pretoria, South AfricaSeveral new sweet potato cultivars have been released in South Africa from 2004 until 2011 with varietal traits suitable for the informal market. This paper reports on results of on-farm trials conducted to evaluate the cultivars in broader agro-ecologies in the country. The trials were conducted at 15 localities across the 2011/12 to 2014/15 planting seasons including six cultivars with varying flesh colours. Data collection included marketable and unmarketable storage root yield classes, dry mass, and taste acceptability. The sites were representative of cool subtropical and warm temperate regions. Statistical analysis included ANOVA, AMMI, Discriminant analysis (DA) and Principal component analysis (PCA). Significant effects were detected for locality*cultivar and region*cultivar interactions for total and marketable yield, and for cultivar only for marketable yield. The factor region was not significant. The mean marketable yield ranged from 13.1 to 19.0 t/ha, being highest for 199062.1 and Ndou, while Bophelo had average stable yield over a broad range of environments. The most prevalent unmarketable class was weevil damage (15.1%). The study demonstrated PCA and DA as quick analytical tools to associate quality traits with cultivars to facilitate cultivar recommendations. Bophelo and Ndou had been sold with success on local informal markets and have large potential to be promoted wider.https://doi.org/10.1515/opag-2017-0047ammidiscriminant analysissweetpotatoyield |
| spellingShingle | Laurie Sunette Calitz Frikkie Mtileni Musa Mphela Whelma Tjale Sidwell Performance of informal market sweet potato cultivars in on-farm trials in South Africa Open Agriculture ammi discriminant analysis sweetpotato yield |
| title | Performance of informal market sweet potato cultivars in on-farm trials in South Africa |
| title_full | Performance of informal market sweet potato cultivars in on-farm trials in South Africa |
| title_fullStr | Performance of informal market sweet potato cultivars in on-farm trials in South Africa |
| title_full_unstemmed | Performance of informal market sweet potato cultivars in on-farm trials in South Africa |
| title_short | Performance of informal market sweet potato cultivars in on-farm trials in South Africa |
| title_sort | performance of informal market sweet potato cultivars in on farm trials in south africa |
| topic | ammi discriminant analysis sweetpotato yield |
| url | https://doi.org/10.1515/opag-2017-0047 |
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