Journal of
Soil Science and Environmental Management

  • Abbreviation: J. Soil Sci. Environ. Manage.
  • Language: English
  • ISSN: 2141-2391
  • DOI: 10.5897/JSSEM
  • Start Year: 2010
  • Published Articles: 303

Full Length Research Paper

Fertilizer recommendations for optimal soybean production in North and Center Benin

Faki O. Chabi
  • Faki O. Chabi
  • Integrated Soil and Crop Management Research Unit, Laboratory of Soil Sciences, Crop Sciences School, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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Gustave D. Dagbenonbakin
  • Gustave D. Dagbenonbakin
  • Institut National des Recherches Agricoles du Benin, 01 BP 988 RP, Cotonou 01, Benin.
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Emile C. Agbangba
  • Emile C. Agbangba
  • Laboratory of Research in Applied Biology, Department of Environmental Engineering, Polytechnic School of Abomey-Calavi, University of Abomey-Calavi, Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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Brice T. Oussou
  • Brice T. Oussou
  • Laboratoire des Sciences du Sol, Eau et Environnement (LSSEE), Centre de Recherche d’Agonkanmey, Institut National des Recherches Agricoles du Benin (INRAB), 01 BP 988 RP, Cotonou 01, Benin.
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Bérékia K. Agban
  • Bérékia K. Agban
  • Integrated Soil and Crop Management Research Unit, Laboratory of Soil Sciences, Crop Sciences School, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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Mireille Dakpo
  • Mireille Dakpo
  • Integrated Soil and Crop Management Research Unit, Laboratory of Soil Sciences, Crop Sciences School, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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Léonard E. Ahoton
  • Léonard E. Ahoton
  • Integrated Soil and Crop Management Research Unit, Laboratory of Soil Sciences, Crop Sciences School, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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Guillaume L. Amadji
  • Guillaume L. Amadji
  • Laboratory of Soil Science, Faculty of Agronomic Sciences, University of Abomey-Calavi, Abomey-Calavi, Benin.
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Saïdou Aliou
  • Saïdou Aliou
  • Integrated Soil and Crop Management Research Unit, Laboratory of Soil Sciences, Crop Sciences School, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 RP, Cotonou, Benin.
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  •  Received: 07 January 2021
  •  Accepted: 29 March 2021
  •  Published: 30 April 2021

Abstract

In the traditional cropping systems of Benin Republic, soybean is mostly cultivated with no mineral fertilizer supply, despite the decrease of soil fertility. Furthermore, there is no specific fertilizer available for the crop, in spite of its cash crop character. This leads to weak crop yield in the farmers’ fields. The present study aims to determine the optimal doses of each N, P, K, Mg and Zn nutrient to improve soybean production in the Sudano-Guinean and Sudanian zones of Benin Republic. Two years (2018 and 2019) experiment has been carried out in Ouessè district (Sudano-Guinean zone) and Bembèrèkè district (Sudanian zone). Box and Behnken rotating design was used to define N, P, K, Mg and Zn dose combinations leading to 46 combinations. A completely randomized block design was set up considering farmers as replication. In total four farmers’ fields are selected. A one-way analysis of variance is made on the yield data, using the linear mixed-effect model. Response surface analyses are used to determine the optimal dose for each N, P, K, Mg and Zn. The supply of macronutrients combined with Zn, significantly (p = 0.001) improved the soybean grain and above biomass yields as well as the harvest index. The quadratic models were efficient (R² > 0.7) to estimate soybean grain yields considering the nutrient dose variation. The optimal N, P, K, Mg and Zn doses of 15.46, 23.20, 28.6, 16.8 and 6.9 kg.ha-1, respectively (for the Sudano-Guinean zone) and 14.02, 23.89, 17.82, 11.45 and 4.26 kg.ha-1, respectively (for the Sudanian zone) lead to an optimal seed yield of 2 t.ha-1 (that is, almost 2.2 times the yield in the farmers’ field). The development of fertilizer formulas using these determined optimal doses would constitute a suitable technology helping to increase soybean production in both areas.

Key words: Soil fertility, biofortication, Box and Behnken design, linear mixed-effect model, leguminous, response surface, micronutrient.