Nine sites (Axim, Accra, Ada, Akatsi, Akuse, Kpandu, Kumasi, Yendi and Wa) in different climatic zones of Ghana were selected. The first five sites lie near the southern coastline of Ghana. Kpandu lies in the savanna-forest transition, Kumasi lies in the semi-decidous tropical rain forest located in the middle belt of Ghana. Yendi and Wa lie within the interior savanna in northern Ghana. Except for Yendi and Wa where rainfall is unimodal (May to October), all the other sites experience bimodal rainfall with the major season from April to July and the minor season from September to November.
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