The relation between the date of heading of Nigerian sorghums and the duration of the growing season.
Abstract
A variety indigenous to northern Nigeria yields best in its own locality, the time of flowering coinciding with the end of the rainy season. If the variety is grown further south or north it will flower at the same time and if this does not correspond with the end of the rains in the new locality the yield will be reduced. This adaptation to the end of the rains is probably a photo-periodic effect.