SHEORAN, P. et al. 2018. Sulphur, boron and zinc nutrition to improve productivity, profitability and oil quality in sunflower (Helianthus annuus). The Indian Journal of Agricultural Sciences. 88, 11 (Nov. 2018), 1746–1756. DOI:https://doi.org/10.56093/ijas.v88i11.84921.