All the following forms of subsistence farming in West Africa except

The form of subsistence farming that is not commonly practiced in West Africa is plantation agriculture. Plantation agriculture is a form of commercial farming where large tracts of land are cultivated with a single crop, usually for export purposes. This is not a typical form of subsistence farming because it requires significant financial investment, expertise, and technology to set up and maintain. On the other hand, mixed farming, rotational bush fallowing, permanent cultivation, and pastoral nomadism are common forms of subsistence farming in West Africa. Mixed farming involves cultivating different crops and raising animals on the same piece of land, while rotational bush fallowing involves moving from one plot of land to another in order to allow the soil to regenerate. Permanent cultivation involves farming a plot of land continuously for a long period of time without letting it lie fallow, and pastoral nomadism involves moving herds of animals from place to place in search of grazing land.