Cowpea genotypes viz. VCM-8, C-152 and ACCC-210 sown in each month from December 1986 to November 1987 showed that flowering and maturity of cowpea were affected by day-length, night temperature and humidity. Mean maximum number of days for flowering (55.3) and maturity (75.5) were required when crop experienced shorter day-length, lower night temperatures and less humidity during December 86, January and February 87 sowings, whereas mean minimum days for flowering (38.8) and maturity (56.3) were required when crop experienced higher night temperatures, shorter daylength and moderate humidity during September and October 87 sowings. Mean thermal units required for flowering (601.6) and maturity (834.0) were minimum during September and October sowings whereas these were maximum during December, January and February sowings. This indicated the role of day-length, night temperature and humidity in flowering and maturity of eowpea.
