RESEARCH ON SEXUAL PROPAGATION OF SINDORA TONKINENSIS A. CHEV. EX K. & S.S. LARSEN

Abstract

Sindora tonkinensis is a large, native tree species valued for its use in interior decoration and household items. This study presents the results of research on the sexual propagation of this spieces, providing a basis for technical guidelines covering seed treatment, sowing techniques, potting mix composition, and seedling care in the nursery. The findings of the propagation research indicate that the highest germination rate (94%) was achieved through a seed treatment protocol involving partial seed coat sanding, followed by soaking the seeds in warm water at 55°C for 12 hours. The timing of transplanting was found to significantly affect the survival rate and growth of Sindora tonkinensis seedlings in the nursery (sig < 0.05). Approximately 25 days after sowing, the seedlings developed two cotyledons and reached a height of 5 – 7cm, at which point they were transplanted into pots, resulting in a survival rate of 86% after 12 months. The composition of the potting mix was found to influence seedling survival, root diameter growth, and height during the 6–12 month period. After 12 months of germination and cultivation, the optimal potting mix formulation, consisting of 89% topsoil, 10% manure, and 1% NPK (5:10:3), yielded the highest survival rate (91.3%), with an average seedling height of 77.1cm and an average root diameter of 7.9cm. Supplementary irrigation was found to have a significant impact on the growth of root diameter and height of Sindora tonkinensis seedlings in the nursery. Over the course of 12 months, three supplementary irrigations resulted in the best seedling growth, with an average root diameter of 8.3mm and a height of 87.2cm.