TY - JOUR T1 - Morphological changes in four azolla genotypes concurrently grown with irrigated lowland rice JF - Philippine Agricultural Scientist, The (Formerly the Philippine Agriculturist) A1 - Parot-Alcantara, Virginia A2 - Lales, Joveno S. LA - English YR - 1992 UL - https://tuklas.up.edu.ph/Record/IPP-00000658695 KW - Azolla KW - Plant morphology ER -