期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：1996
卷号：7
期号：1
页码：7-15
出版社：John Libbey Eurotext
摘要：Author Mbaye Diop Centre de recherches de climatologie, Faculté des sciences Gabriel, 6, boulevard Gabriel, 21004 Dijon cedex, France Page(s) : 7-15 Published in: 1996 In Senegal, the major agricultural work is done during the rainy season. This, however, varies considerably from one year to the next and from place to place. Its onset and duration must therefore be determined to allow the optimum sowing dates or periods to be decided on and the best spatial distribution of crops according to length of vegetative cycle to be assessed. This study shows the large spatial and temporal variability in the rainy season’s duration. The results showed there to be an 80% probability of the vegetative season beginning between June 24 and July 11 and lasting 110 to 146 days in the south and south-east of the country, and between August 2 and 21 and lasting 56 to 71 days in the north and north-east of the country. The results also show that along with the general decrease in rainfall since the sixties, there has been a distinct shortening of the useful agricultural season.
