Variability and determinants of yields in rice production systems of West Africa

Niang, A.; Becker, M.; Ewert, Frank; Dieng, Ibnou; Gaiser, Thomas; Tanaka, Atsuko; Senthilkumar, K.; Rodenburg, Jonne; Johnson, Jean‐Martial; Akakpo, Cyriaque; Segda, Zacharie; Gbakatchétché, Henri; Jaiteh, Famara; Bam, Ralph; Dogbe, Wilson; Sékou, Keita; Kamissoko, Nianankoro; Mossi, Illiassou Maïga; Bakare, Oladele S.; Cissé, M.F.; Baggie, I.; Ablede, K. A.; Saito, Kazuki

doi:10.1016/j.fcr.2017.02.014

Cited by 114 publications

(87 citation statements)

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“…Both model and data reported in Niang et al. () and Tanaka et al. () show highest yields in irrigated systems in the semiarid zone, where radiation levels are high and where, if irrigation and fertilizer are available, high yields can be obtained.…”

Section: Methodsmentioning

confidence: 70%

“…This was indeed the case. Both model and data reported inNiang et al (2017) andTanaka et al (2017) show highest yields in irrigated systems in the semiarid zone, where radiation levels are high and where, if irrigation and fertilizer are available, high yields can be obtained. Simulated and actual yields were also high in the main season in the highlands of East Africa (e.g.…”

mentioning

confidence: 81%

“…In reality, many of these conditions are present virtually everywhere in rice in Africa (e.g. Niang et al., ; Tanaka et al., ). Even the farmers with 10% highest yields (Tanaka et al., ) have yield gaps.…”

Section: Methodsmentioning

confidence: 99%

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Impacts of climate change on rice production in Africa and causes of simulated yield changes

Oort

Zwart

2017

Global Change Biology

207

101

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This study is the first of its kind to quantify possible effects of climate change on rice production in Africa. We simulated impacts on rice in irrigated systems (dry season and wet season) and rainfed systems (upland and lowland). We simulated the use of rice varieties with a higher temperature sum as adaptation option. We simulated rice yields for 4 RCP climate change scenarios and identified causes of yield declines. Without adaptation, shortening of the growing period due to higher temperatures had a negative impact on yields (−24% in RCP 8.5 in 2070 compared with the baseline year 2000). With varieties that have a high temperature sum, the length of the growing period would remain the same as under the baseline conditions. With this adaptation option rainfed rice yields would increase slightly (+8%) but they remain subject to water availability constraints. Irrigated rice yields in East Africa would increase (+25%) due to more favourable temperatures and due to CO2 fertilization. Wet season irrigated rice yields in West Africa were projected to change by −21% or +7% (without/with adaptation). Without adaptation irrigated rice yields in West Africa in the dry season would decrease by −45% with adaptation they would decrease significantly less (−15%). The main cause of this decline was reduced photosynthesis at extremely high temperatures. Simulated heat sterility hardly increased and was not found a major cause for yield decline. The implications for these findings are as follows. For East Africa to benefit from climate change, improved water and nutrient management will be needed to benefit fully from the more favourable temperatures and increased CO2 concentrations. For West Africa, more research is needed on photosynthesis processes at extreme temperatures and on adaptation options such as shifting sowing dates.

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Section: Methodsmentioning

confidence: 70%

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confidence: 81%

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Impacts of climate change on rice production in Africa and causes of simulated yield changes

Oort

Zwart

2017

Global Change Biology

207

101

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“…Typical major abiotic and biotic stresses include cold stress in highlands (Ahmadi et al, 2004;Raboin et al, 2014), drought (Kijima et al, 2011;Niang et al, 2017Niang et al, , 2018Saito et al, 2013Saito et al, , 2017, soil-related problems including acidity and N and P deficiency (Asai et al, 2009;Haefele et al, 2014;Okada & Fischer, 2001;Saito, Linquist, Keobualapha, et al, 2006;Saito et al, 2007Saito et al, , 2013, weeds (Becker & Johnson, 2001;, and soil-borne pests such as nematodes (Balasubramanian et al, 2007). There are also large year-to-year variations in abiotic and biotic stresses due to climate conditions (such as rainfall pattern), which could lead to reduced investment by farmers in inputs and result in larger yield gaps .…”

Section: Introductionmentioning

confidence: 99%

“…Low yields of upland rice are often attributed to sub-optimal crop management practices, limited availability of high-yielding varieties, and abiotic and biotic stresses (some of which might be associated with land use pressure) (Becker & Johnson, 2001;Diagne et al, 2013;Niang et al, 2017;Saito, Linquist, Keobualapha, et al, 2006;Saito et al, 2013;Tanaka et al, 2017). Typical major abiotic and biotic stresses include cold stress in highlands (Ahmadi et al, 2004;Raboin et al, 2014), drought (Kijima et al, 2011;Niang et al, 2017Niang et al, , 2018Saito et al, 2013Saito et al, , 2017, soil-related problems including acidity and N and P deficiency (Asai et al, 2009;Haefele et al, 2014;Okada & Fischer, 2001;Saito, Linquist, Keobualapha, et al, 2006;Saito et al, 2007Saito et al, , 2013, weeds (Becker & Johnson, 2001;, and soil-borne pests such as nematodes (Balasubramanian et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Progress in varietal improvement for increasing upland rice productivity in the tropics

Saito

Asai

Zhao

et al. 2018

Plant Production Science

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Enhancing rice yield in upland rice systems through genetic improvement remains a major challenge in the tropics. This review aims to provide the trends on upland rice cultivation over the last 30 years and recent distribution of upland rice in the tropics, and to report progress in studies on genetic improvement for enhancing productivity in Africa, Asia, and Latin America. While upland rice cultivation area has reduced in Asia and Latin America over the last 30 years, the area in Africa has increased. The current share of upland rice area in total rice area is related to rainfall and gross national income per capita, especially in Africa, and higher share is associated with lower rice selfsufficiency at national level. Breeding programs in Asia and Latin America have developed highyielding varieties using indica materials as parents. In Africa, New Rice for Africa (NERICA) varieties were developed from crosses between improved tropical japonica and Oryza glaberrima. However, recent studies report that there is scope for improving existing NERICA using upland indica materials from Asia. In highlands of Africa, there are ongoing breeding programs using japonica varieties, such as the Nepalese Chhomrong Dhan. Key important plant traits used in the breeding programs are not largely different across regions, especially intermediate plant height and tillering capacity (which may be related to weed-suppressive ability), and high harvest index. In conclusion, we propose an international network for breeding upland rice with accelerating seed exchange across regions that could enhance upland rice productivity through genetic improvement.

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Residual level of dimethachlon in rice‐paddy field system and cooked rice determined by gas chromatography with electron capture detector

Sun

Zeng

Zhong

et al. 2018

Biomedical Chromatography

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In this study, a modified quick, easy, cheap, effective, rugged and safe method coupled with gas chromatography with electron capture detection was established to determine dimethachlon residues in paddy soil, rice husk, rice straw, brown rice and cooked rice. The limits of quantification of dimethachlon were 0.01 mg/kg for paddy soil, brown rice and cooked rice and 0.02 mg/kg for rice straw and rice husk. The mean recoveries were in the range 78.59-104.7% with relative standard deviation values of <10% for dimethachlon in the five matrices. For field experiments, the final residues of dimethachlon in paddy soil were < 0.05 mg/kg and were < 1.21 mg/kg in rice straw from six sites. The final residues of dimethachlon in the brown rice at 21, 28 and 35 days after spraying from six sites were 0.08-7.58 mg/kg, and 0.16-30.1 mg/kg in rice husk. Our six test sites covered the main rice-producing areas of China. The routine rice cooking process of a Chinese family could apparently increase the removal of dimethachlon in rice compared with brown rice, and the reduction ratios were > 96%.

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Variability and determinants of yields in rice production systems of West Africa

Cited by 114 publications

References 50 publications

Impacts of climate change on rice production in Africa and causes of simulated yield changes

Impacts of climate change on rice production in Africa and causes of simulated yield changes

Progress in varietal improvement for increasing upland rice productivity in the tropics

Residual level of dimethachlon in rice‐paddy field system and cooked rice determined by gas chromatography with electron capture detector

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