Study on the Quality Classification Criteria of Phoebe chekiangensis Annual Container Seedling
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％.
万方数据
维普
