K.K. AGRAWAL, A.P. UPADHYAY, UPENDRA SHANKER, and V.K. GUPTA. 2002. “Thermal Requirement of Sunflower Plant Types under Three Dates of Spring Planting”. Journal of Agrometeorology 4 (2):165-69. https://doi.org/10.54386/jam.v4i2.462.