|Better Farming Series 16 - Roots and Tubers (FAO - INADES, 1977, 58 p.)|
To grow well, yams need a warm, humid climate, with abundant, prolonged rain.
Yams cannot be grown in very dry regions, or where the sunlight is too strong. Yams need shade during the early stages of growth.
This is why in Africa, yams are grown in regions between the dense forest and the dry, treeless savanna.
Yams grow well in rich, deep, permeable soil that is not too sandy.
The tubers do not grow well in heavy soils.
Swampy land that is flooded for several days during the rainy reason is not suitable for growing yams.