417 Dig the yam, but leave it in an open hole in well drained dry ground. Cover the hole with coconut leaves.
416 Learn how to make Manioc Flour (Modern & traditional methods) so that harvested tubers can be preserved for extended periods.
413 Use Open and deep hole planting of Taro, dig a deep hole, place taro inside, do not bury so as to allow air cooling of the growing taro.