P.K. KINGRA, PRABHJYOT KAUR, MANDEEP KAUR KHEHRA, S. S. HUNDAL. Thermal requirement and heat use efficiency of sunflower (Helianthus annus L.) in Punjab. J. Agrometeorol. [Internet]. 2007 Dec. 1 [cited 2024 Dec. 25];9(2):223-30. Available from: https://journal.agrimetassociation.org/index.php/jam/article/view/1132