P.K. KINGRA, PRABHJYOT KAUR, MANDEEP KAUR KHEHRA and S. S. HUNDAL 2007. Thermal requirement and heat use efficiency of sunflower (Helianthus annus L.) in Punjab. Journal of Agrometeorology. 9, 2 (Dec. 2007), 223–230. DOI:https://doi.org/10.54386/jam.v9i2.1132.