TEJ SINGH; HARBIR SINGH; BALDEV RAJ. Effect of genotype, irrigation and fertility on yield, nitrogen- recovery and its use efficiency in spring sunflower (Helianthus annuus). Indian Journal of Agronomy, [S. l.], v. 44, n. 1, p. 44_1 , 2001. DOI: 10.59797/ija.v44i1.3481. Disponível em: https://pub.isa-india.in/index.php/ija/article/view/3481. Acesso em: 25 jun. 2026.