MUTHUMANICKAM, D. Influence of different phosphorus sources and zinc spray on yield and quality of black pepper (Piper nigrum L.) under acid soils. Journal of Spices and Aromatic Crops, [S. l.], v. 12, n. 1, p. 15–18, 2003. Disponível em: https://www.updatepublishing.com/journal/index.php/josac/article/view/4741. Acesso em: 5 oct. 2025.