RESEARCH ON SEED PROPAGATION OF Dioscorea collettii Hook.f.

Abstract

Dioscorea collettii is a plant that regenerates by seeds or tubers. This study focuses on determining seed treatment measures, sowing season, seeding methods on germination rate and the effects of age and seedling size on survival and growth rate of Dioscorea collettii seedlings in Si Lo Lau commune, Lai Chau province. The experiment was arranged in a completely randomized design with three replications. Seed treatment measures were carried out with 2 experiments: seed treatment with 54^oC water including five treatments (Untreated (Control); seed soaking for 3 hours, 6 hours, 9 hours, 12 hours) and GA₃ solution 500 ppm including four treatments (Untreated (Control); seed soaking for 1 hour, 3 hours, 6 hours). The seasonal experiment included four treatments (Sowing on 15/1; 15/2; 15/3; 15/4). The experiment on sowing methods included four treatments (Sowing seeds directly on the substrate in the field; in a covered garden; after sowing, seeds were covered with a 0.5 - 1 cm thick layer of substrate in the field and in a covered garden). The experiment on the age and size of seedlings included 5 formulas (60-day-old plants; 90-day-old plants; 120-day-old plants; 150-day-old plants). The research showed that: The best method of treating seeds with warm water at 54 degrees for 9 hours, removing and draining, continuing to soak the seeds in a GA₃ solution with a concentration of 500 ppm for 3 hours gave a germination rate of 84%. The most suitable season for sowing seeds was March 15, giving a germination rate of 86%. The research also showed that after sowing, seeds were covered with a 0.5 - 1 cm thick layer of substrate in a covered nursery, the germination rate reached 91%. Seedlings at 90 days old are most suitable for a survival rate of 67.7%.