Weed competitiveness of the lowland rice varieties of NERICA in the southern Guinea Savanna |
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| Authors: | Jonne Rodenburg Kazuki Saito Romain Glele Kakaï Amadou Touré Mariame Mariko Paul Kiepe |
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| Institution: | 1. Africa Rice Center (AfricaRice), East and Southern Africa, P.O. Box 33581, Dar es Salaam, Tanzania;2. Africa Rice Center (AfricaRice), 01 BP 2031, Cotonou, Benin;3. Faculté des Sciences Agronomiques, Université d’Abomey Calavi, 01 BP 526, Cotonou, Benin |
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| Abstract: | Weed competition is a major constraint to lowland rice production in West Africa. Interspecific rice varieties named New Rice for Africa (NERICA) may have superior weed competitiveness and could as such play an important role in integrated weed management. The NERICA varieties were developed from the wide cross between high-yielding Oryza sativa (L.) and weed competitive and disease resilient Oryza glaberrima (Steud.). In this study weed competitiveness of all 60 lowland varieties of NERICA (NERICA-L) was compared with their most frequently used parents IR64 (O. sativa) and TOG5681 (O. glaberrima)], the weed competitive variety Jaya (O. sativa) and the O. glaberrima upland NERICA parent CG14. During the 2006 and 2007 rainy seasons these varieties were grown under weed-free and weedy conditions in a lowland farmers’ field with partially controlled irrigation in south-east Benin. Weedy plots included single hand weeding at 28 days after sowing, whereas weed-free plots were weekly weeded. |
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| Keywords: | Oryza sativa Oryza glaberrima Weed competition Yield loss Weed suppressive ability (WSA) West Africa |
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