Vulnerability assessment of the maize and sorghum crops to climate change in Botswana

A. C. Chipanshi, R. Chanda, O. Totolo

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

This study examines the sensitivity of maize and sorghum crops to global warming in Botswana, a country with arid climatic conditions and shortfalls in locally produced grain. The vulnerability of the maize and sorghum crops to climate change were studied using crop simulation models while climate change scenarios were generated from Global Circulation Models. Simulated yields indicated that rain-fed crop production under the observed climate was a small fraction of what could be produced under optimal conditions. The gap was attributed to both physical (especially lack of rain) and socio-economic constraints. Using the southern African core climate change scenario, simulated yields declined by 36% in the case of maize and 31% for sorghum in the sand veldt region. Yield reductions from the hard veldt region were in the order of 10% for both maize and sorghum. The growing season became shorter, the average reduction in days in the sand veldt region being 5 and 8 days for maize and sorghum respectively, and correspondingly, 3 and 4 days over the hard veldt region. The food security option currently followed in Botswana was found to be a good adaptive strategy under a changed climate.

Original languageEnglish
Pages (from-to)339-360
Number of pages22
JournalClimatic Change
Volume61
Issue number3
DOIs
Publication statusPublished - Dec 1 2003

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sorghum
vulnerability
maize
crop
climate change
sand
climate
food security
crop production
global warming
growing season
simulation
rain

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Atmospheric Science

Cite this

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Vulnerability assessment of the maize and sorghum crops to climate change in Botswana. / Chipanshi, A. C.; Chanda, R.; Totolo, O.

In: Climatic Change, Vol. 61, No. 3, 01.12.2003, p. 339-360.

Research output: Contribution to journalArticle

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