8. Drought spells and drought frequencies in west-Afrika (durée et fréquence des périodes séches en Afrique de l'ouest.)
ICRISAT Research Bulletin No. 13, ISBN 92-9066-182-8, 1991, Order Code RBE 013; LDCs: USD 14.31, HDCs: USD 33.11; Bilingual: English, French
This publication is bilingual (English and French). Recurring droughts and decreased agricultural productivity during the last two decades in West Africa have pointed to the need for a clearer understanding of the length of dry spells, their frequencies and probabilities. A comprehensive review of various definitions of droughts has been presented to develop the basis for analysis of droughts. Using the specific definition of onset of rains in each year as the sowing date, the length of dry spells was calculated from the historical rainfall data for 150 stations located in Burkina Faso, Mali, Niger, and Senegal.
The relationships between mean annual rainfall and average frequency of dry spells for the selected locations in West Africa showed distinct patterns and permit the prediction of the frequency of dry spells from annual rainfall totals. Applications of dry-spell analysis for the choice of a crop/variety, supplemental irrigation, and crop water requirements have been described with examples.
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Syria, Israel, Netherlands, study, faba beans, climate change, temperature rise, CO2 increase, yield stability, ecology
GRASHOFF, C. et al.
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