CUEVAS, Zenaida M.; SANTIAGO, Rebecco M.; BRIONES, Elizabeth D. EFFECT OF AZOLLA AS SOURCE OF NITROGEN ON THE GROWTH AND YIELD OF PECHAY (Brassica napus L. var. chinensis). Annals of Tropical Research, [S. l.], v. 10, n. 2, p. 85–93, 1988. Disponível em: https://atr.vsu.edu.ph/article/view/643. Acesso em: 5 dec. 2025.