In this study,the container seedlings of Phoebe chekiangensis were used as experimental materials.The Ground diameter and seedling height were used as grading indexes,and the mean±standard deviation method and stepwise cluste-ring method were used to carry out the research on the quality classification of annual seedlings.Found that the standard deviation method to calculate the grade Ⅰ seedlings under the limit on the high side,stepwise clustering method to calculate grade Ⅱ seedling lower limit on the high side.The quality classification criteria of annual container seedling of Phoebe chekiangensis were determined comprehensively:the diameter of seedling field was above 0.24 cm,and the height of seed-ling was above 13.0 cm.The seedling diameter of grade Ⅱ ranged from 0.15 cm to 0.24 cm,and the seedling height ranged from 8.0 cm to 13.0 cm.Grade Ⅰ and Ⅱ seedlings were qualified seedlings,and the control rate of qualified seed-lings was close to 85％.
维普
万方数据