Seedling Cultivation Technology of Castanopsis uraiana

In order to study the seedling cultivation technology of Castanopsis uraiana,from 2020 to 2022,Castanopsis uraiana seeds were collected in Ninghua County,Fujian Province to conduct germination acceleration experiments with different substrates and seedling cultivation experiments with different container specifications. The results show that among the four germination substrates,the germination rate,germination potential,and germination index of Castanopsis uraiana seeds from high to low were coarse river sand,fine river sand,yellow loam + burned soil,and yellow loam,and the corresponding germination time gradually increases. Germination acceleration with coarse sand as the substrate was the best. The average germination time was only 18.3 days. Its germination rate,germination potential,and germination index were significantly higher than those of yellow loam + burned soil and yellow loam substrates,and there was no significant difference compared to the fine sand substrate. Among the methods of cultivating one-year-old Castanopsis uraiana seedlings,the seedling transplantation method using non-woven fabric nutrient soil sprouts performs the best. The average seedling height was 33.9 cm,the average ground diameter was 0.34 cm,and the qualified seedling rate was 92.5%. The number of lateral roots greater than 5 cm is the largest. The experiment of cultivating two-year-old Castanopsis uraiana seedlings with different container specifications showed that using non-woven fabric nutrient bags with a container specification of 12 cm×14 cm was better than those with container specifications of 10 cm×12 cm and 8 cm×10 cm. The average seedling height,ground diameter,qualified seedling rate,The seedling outplanting rate and height-diameter ratio reach 89.1 cm,0.92 cm,99.3%,and 96.8 respectively. Adding mycorrhizal soil had no significant effect on the emergence rate of Castanopsis uraiana seeds,but had a significant effect on the growth of ground diameter and seedling height of Castanopsis uraiana seedlings. Among them,seedlings cultivated with yellow loam 60% + burned soil 20% + mycorrhizal soil 20% (D₁) as the substrate grow the best. The average seedling height reaches 38.8 cm,the average ground diameter reaches 0.38 cm,and the number of lateral roots greater than 5 cm reaches 11.2. The comprehensive results showed that for Castanopsis uraiana seeds,using coarse river sand as the germination acceleration substrate and using sprout transplantation and non-woven fabric nutrient soil with a specification of 12 cm×14 cm for cultivating one- to two-year-old seedlings had the best effect.