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

already amount applied areas become boiled buds cassava cause cells characteristics cocoyams considerable consumed contains continue corm countries crop cultivars cultivation cutting cyanide decrease depends develop disease early effective emergence extent farmers fertilizer field Figure flooded flowers formation fresh give greater growing grown growth harvesting important improvement increase initiation intercropping labour land later layer leaf leaves less major mature means mechanical method months mounds occur Onwueme period placed planting material portions practice preference preparation present probably problem recommended reduced regions relatively remain reported requires result roots rotting season seed setts shoot soil sometimes spacing species sprouting staking starch stem storage stored surface sweet potato tannia taro temperature tend traditional tropical types usually utilization various vine weeds weeks weight West Africa yam production yam tuber yield