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Quantifying rice yield gaps and their causes in Eastern and Southern Africa

Quantifying rice yield gaps and their causes in Eastern and Southern Africa

Senthilkumar, Kalimuthu, Rodenburg, Jonne ORCID: 0000-0001-9059-9253, Dieng, Ibnou, Vandamme, Elke, Sillo, Fitta Silas, Johnson, Jean‐Martial, Rajaona, Arisoa, Ramarolahy, Jemima Amielle, Gasore, Rene, Abera, Bayuh Belay, Kajiru, Geophrey J., Mghase, Jerome, Lamo, Jimmy, Rabeson, Raymond and Saito, Kazuki (2020) Quantifying rice yield gaps and their causes in Eastern and Southern Africa. Journal of Agronomy and Crop Science, 206 (4). pp. 478-490. ISSN 0931-2250 (Print), 1439-037X (Online) (doi:https://doi.org/10.1111/jac.12417)

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Abstract

The demand for rice in Eastern and Southern Africa is rapidly increasing because of changes in consumer preferences and urbanization. However, local rice production lags behind consumption, mainly due to low yield levels. In order to set priorities for research and development aimed at improving rice productivity, there is a need to characterize the rice production environments, to quantify rice yield gaps —i.e. the difference between average on-farm yield and the best farmers’ yield— and to identify causes of yield gaps. Such information will help identifying and targeting technologies to alleviate the main constraints, and consequently to reduce existing yield gaps. Yield gap surveys were conducted on 357 rice farms at eight sites (19-50 farmers per site) across five rice-producing countries in Eastern and Southern Africa —i.e. Ethiopia, Madagascar, Rwanda, Tanzania and Uganda— for one or two years (2012-13) to collect both quantitative and qualitative data at field and farm level. Average farm yields measured at the eight sites ranged from 1.8 to 4.3 t ha–1 and the average yield gap ranged from 0.8 to 3.4 t ha–1. Across rice growing environments, major causes for yield variability were straw management, weeding frequency, growth duration of the variety, weed cover, fertilizer (mineral and organic) application frequency, levelling and iron toxicity. Land levelling increased the yield by 0.74 t ha–1, bird control increased the yield by 1.44 t ha–1, and sub-optimal management of weeds reduced the yield by 3.6 to 4.4 t ha–1. There is great potential to reduce the current rice yield gap in ESA, by focusing on improvements of those crop management practices that address the main site-specific causes for suboptimal yields.

Item Type: Article
Uncontrolled Keywords: smallholder farmer; weeds; birds; yield variability; irrigated lowland; rainfed lowland; upland
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science > Natural Resources Institute > Ecosystem Services Research Group
Last Modified: 17 Jul 2020 23:20
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None
URI: http://gala.gre.ac.uk/id/eprint/28886

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