Table 1.

Descriptions of the study sites

Sites	Regions	Ecological settings	Climate	AAT (°C)	Seasons	Crops
Yangah	Far North	Dry savanna	Sahelian	33	4 months rainy/8 months dry	Cotton, rice, millet, sorghum, maize
Djohong	Adamawa	Humid savanna	Sudano-Guinean highland	24	7 months rainy/5 months dry	Cotton, coffee millet, sorghum
Dschang	West	Meadowland and forest	Highlands equatorial	21.6	8 months rainy/4 months dry	Coffee, Irish potatoes, maize, cabbage, taro
Santchou	West	Meadowland and forest	Highlands equatorial	22.5	8 months rainy/4 months dry	Maize, cassava, sweet potato, cocoyam, cocoa, coffee
Douala	Littoral	Coastal forest	Coastal equatorial	27.5	9 months rainy/3 months dry	Cocoa, oil palm, rubber, plantain, banana, cassava, yams
Yaoundé	Center	Congolese forest	Equatorial	24	9 months rainy/3 months dry	Cocoa, coffee, yams
Mbandjock	Center	Congolese forest	Equatorial	26.5	7 months rainy/5 months dry	Sugarcane, oil palm, maize, cassava, yams
Mbalmayo	Center	Congolese forest	Equatorial	25	9 months rainy/3 months dry	Cocoa, coffee, cassava, yams, maize
Kribi	South	Congolese forest	Equatorial	26	9 months rainy/3 months dry	Cocoa, oil palm, rubber, cassava, plantains, yams

AAT average annual temperature