Response of Some Rice Varieties Grown in West Africa to Photoperiod

Abstract

Among the 10 rice varieties tested, 6 were insensitive to photoperiod, 2 were weakly-sensitive and 2 strongly-sensitive. All 10 varieties are used in West Africa in the main and off-season cropping. The early planting of the strongly-sensitive varieties during the off-season does not result in prolonged growth duration resulting from the days getting longer. In West Africa, photoperiod-sensitive and non-sensitive varieties can be planted in both cropping seasons without any delay in flowering from daylength. The general delay in flowering during the off-season seems to be the result of low temperature. © 1980, CROP SCIENCE SOCIETY OF JAPAN. All rights reserved.