Abstract
Productivity of pigeon pea crops is considered in terms of the interception of solar radiation and its efficiency of conversion to dry matter. Little radiation was intercepted during early growth. Yield was found to be related to the length of time spent at leaf area indexes at which the fractional interception was large. Efficiency of conversion of intercepted radiation to assimilates did not exceed two per cent. Conditions of moisture stress generally reduced both the seasonal interception of radiation and the efficiency of its conversion.
