Study of solar radiation over cowpea

Abstract

Hourly radiation balance, at three phenophases of cowpea (Vigna unguiculata (L. Walp) crop was studied at Dharwad (15°26' N, 75° 06' E, 678 m. a.s.l.) in India. On daily basis, the radiation utilized was maximum at the seed-setting stage, followed by the flowering and harvesting stages. On hourly basis, the percentage of radiation utilized was found to be maximum during the morning and the evening and minimum in the noon.