African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Rainfed rice response to fertilizer in the Sudan Savanna of West Africa

Idriss Serme
  • Idriss Serme
  • Institut de l’Environnement et de Recherches Agricoles (INERA), O4 BP 8645 Ouagadougou, Burkina Faso.
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Mohamed Dicko
  • Mohamed Dicko
  • Institut d’Economie Rurale (IER), Mali.
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Korodjouma Ouattara
  • Korodjouma Ouattara
  • Institut de l’Environnement et de Recherches Agricoles (INERA), O4 BP 8645 Ouagadougou, Burkina Faso.
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Baba Sidibe
  • Baba Sidibe
  • Institut d’Economie Rurale (IER), Mali.
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Charles Wortmann
  • Charles Wortmann
  • Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln NE, USA.
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  •  Received: 29 March 2018
  •  Accepted: 17 April 2018
  •  Published: 17 May 2018

Abstract

In West Africa, rice (Oryza sativa L. and Oryza glaberrimaI Steud) production is not meeting current demand. Low yields are attributed to diverse biotic and abiotic constraints including nutrient deficiencies, inadequate agronomic practices, and socio-economic constraints. This study quantified yield and profit responses of rainfed rice produced in the Sudan Savanna of Burkina Faso and Mali to fertilizer N, P, K, and Mg-S-Zn-B treatment. The mean yields were 2.2 and 2.4 Mg ha-1 for upland rice in Finkolo and for lowland rice in Longorola in Mali, respectively, and 1.5 and 2.2 Mg ha-1 for upland rice at Boni and Karaba in Burkina Faso. Lowland rice grain yield was not affected by nutrient application at Longorola. The grain yield increases with 30 and 60 kg ha-1 N were, respectively, 0.30 and 0.48 Mg ha-1 at Karaba, 0.21 and 0.34 Mg ha-1 at Boni, and 0.32 and 0.41 Mg ha-1 at Finkolo indicating similarity in response. Grain yield response to P was observed only at Karaba. If fertilizer were applied at 50% rather than 100% of the economically optimum rate, as might be the case for financially constrained farmers, the mean yield increase was 36% less but agronomic efficiency was 23% higher and the profit cost ratio was 66% higher. There was no response to K or to Mg-S-Zn-B. The results, therefore, indicate high potential for profitable response of rainfed upland rice production for Sudan Savanna to fertilizer N but little potential for other fertilizer nutrients. These results should, however, be considered together with other field research results in making fertilizer use decisions.
 
Key words: Agronomic efficiency, economically optimal rate, response function, yield.

Abbreviation

EOR, Economically optimal rate of nutrient application or the rate expected to maximize net return per hectare to nutrient application; Mg-S-Zn-B, a diagnostic treatment containing NPK plus 15 kg ha-1 S, 2.5 kg ha-1 Zn, 10 kg ha-1 Mg, and 0.5 kg ha-1 B; PCR, profit to cost ratio, or the net return divided by the cost of fertilizer nutrient use.