Response of bell-pepper (Capsicum annuum L.) to irradiance - photosynthesis, reproductive attributes and yield

A study on photosynthesis, reproductive attributes and yield was conducted in Arka Gaurav and Arka Mohini varieties of bell-pepper under 100, 75, 50 and 25% irradiance in natural environmental conditions during summer season. The rate of P_N was higher in Arka Gaurav compared with Arka Mohini under all the 4 irradiance levels. The fruit yield was more (236 g/plant in Arka Gaurav and 228 g/plant in Arka Mohini) in the plants grown under 50% irradiance. Reduction in irradiance (50%) resulted in improvement in fruit development and growth as indicated by the highest yield (28–85% more over 100% irradiance) under this treatment. The 50% irradiance having 800 - 950 μmol m⁻² s⁻¹ PAR was found to be ideal for plant growth and better yield in bell-pepper during summer season.