Annual Growth Regularity and Grading Standards for Sarcandra glabra Seedling

The evaluating and grading standards for Sarcandra glabra seedling quality were studied with principal component analysis and cluster analysis methods by observing the annual growth regularity and morphological indices of one-year-old Sarcandra glabraseedling.The results showed that the diameter and height grew faster that other periods from July to October, and reached the maximum when the shading range was 75%.The diameter growth presented double peak at 50% shading rate, and showed a low value in September.The seedling quality could be directly evaluated by the ground diameter, seedling height, and root length and quantity, which could classify the Sarcandra glabra seedling as follows:GradeⅠ, ground diameter≥ 0.30cm, seedling height≥20.0 cm, root length≥15.0cm and root number≥10;Grade II, ground diameter≥ 0.20cm, seedling height≥15.0 cm, root length≥10.0cm and root number≥8.Those seedlings which any index doesn′t meet the standard of Grade II were regarded unqualified.