Maize crop nutrient input requirements for food security in sub-Saharan Africa

H.F.M. ten Berge*, R. Hijbeek, M.P. van Loon, J. Rurinda, K. Tesfaye, S. Zingore, P. Craufurd, J. van Heerwaarden, F. Brentrup, J.J. Schröder, H.L. Boogaard, H.L.E. de Groot, M.K. van Ittersum

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

Nutrient limitation is a major constraint in crop production in sub-Saharan Africa (SSA). Here, we propose a generic and simple equilibrium model to estimate minimum input requirements of nitrogen, phosphorus and potassium for target yields in cereal crops under highly efficient management. The model was combined with Global Yield Gap Atlas data to explore minimum input requirements for self-sufficiency in 2050 for maize in nine countries in SSA. We estimate that yields have to increase from the current ca. 20% of water-limited yield potential to approximately 50–75% of the potential depending on the scenario investigated. Minimum nutrient input requirements must rise disproportionately more, with N input increasing 9-fold or 15-fold, because current production largely relies on soil nutrient mining, which cannot be sustained into the future.

Original languageEnglish
Pages (from-to)9-21
JournalGlobal Food Security
Volume23
DOIs
Publication statusPublished - Dec 2019

Keywords

  • Cereals
  • Crop nutrient requirements
  • Food self-sufficiency
  • Intensification
  • Maize
  • Soil fertility
  • Sub-saharan Africa
  • Yield gaps
  • Zea mays

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