The effect of pinching and spraying with zinc on the yield of seeds and oil of castor plant (Ricinus communis L.). Journal of Pharmaceutical Negative Results, [S. l.], p. 355–362, 2022. DOI: 10.47750/pnr.2022.13.S01.44. Disponível em: https://www.pnrjournal.com/index.php/home/article/view/598.. Acesso em: 20 jun. 2026.