Cuevas ZM, Santiago RM, Briones ED. EFFECT OF AZOLLA AS SOURCE OF NITROGEN ON THE GROWTH AND YIELD OF PECHAY (Brassica napus L. var. chinensis). Ann. Trop. Res [Internet]. 1988 Sep. 20 [cited 2025 Dec. 5];10(2):85-93. Available from: https://atr.vsu.edu.ph/article/view/643