SYNTHESIS OF LA₂ O₃ /SIO₂ NANOCOMPOSITE BASED ON RICE HUSK ASH AND LA(NO₃ )₃ FOR USE AS A GROWTH-STIMULATING AGENT IN PARAMIGNYA TRIMERA (OLIV.) GUILLAUM

In this study, La₂O₃/SiO₂ material was synthesized and applied as a growth stimulant for Paramignya trimera (Xáo tam phân) plants, using La(NO₃)₃ and rice husk ash as precursors through the sol-gel method combined with gamma irradiation. The morphology and structure of the material were confirmed through various physicochemical characterization methods, including XRD, EDX, IR, SEM, and TEM analyses, which showed that the La₂O₃/SiO₂ particles had sizes ranging from 50 to 80 nm. The results of the investigation on the effect of La₂O₃/SiO₂ on the growth and development of Paramignya trimera indicated that La₂O₃/SiO₂ significantly influenced the plant’s growth. Experimental data demonstrated an increase in yield by 8 tons per hectare, an average root length increase of 7.3 cm, and a stem height increase of 22 cm compared to the control sample. Additionally, plants treated with La₂O₃/SiO₂ were sturdier and showed no signs of leaf yellowing. These findings suggested that La₂O₃/SiO₂ acted as an effective growth stimulant for Paramignya trimera.