Tropical Root and Tuber Crops: Production, Perspectives and Future Prospects

alata boiled buds bulbils cassava green mite cassava plant cassava tuber cayenensis cells cocoyams consumption corm corms and cormels cultivars cultivation cyanide decrease develop Dioscorea Dioscorea esculenta disease dormancy double-harvesting dry season emergence esculenta farmers fertilizer field flakes flooded taro flowers fresh tuber grown growth hectare IITA increase infected intercropping kg/hectare labour lamina large tubers layer leaves linamarase maize mature meristem method moisture months after planting mounds mulch nematode Nigeria nitrogen occur Onwueme peeled periderm Pesticide residues pests petiole phloem planting material portions potassium pounded yam pre-sprouting problem protein rainy season regions relatively requires residues in food result ridges rotting rotundata seed senescence setts shoot single-harvesting soil spadix species sprouting staking starch stem storage stored surface sweet potato tannia taro temperature tend tonnes traditional tropical tubers tuber crops tuber formation tuber initiation usually vascular West Africa xylem yam plant yam production yam tuber yield