Study on Grading of Three-year Seedlings of Camellia huana
In order to establish the classification standards of Camellia huana seedlings and put forward the theoretical basis for the cultivation of Camellia huana,we investigated seedling height and ground diameter of 3-year-old Camellia huana seedlings in state-owned forest farm in Luodian County,in Guizhou Province.The quality classification of seedlings was analyzed by using the K-mean cluster analysis and standard deviation method.The results showed that the standard deviation analysis was as follows:grade Ⅰ,H≥60.9 cm and D≥8.78 mm;grade Ⅱ,45.7 cm ≤ H＜60.9 cm,6.40 mm≤D＜8.78 mm;grade Ⅲ,H＜45.7 cm and D＜6.40 mm.The proportion of grade Ⅰ and Ⅱ seedlings was about 85％.The results of K-mean clustering were as follows:grade Ⅰ,HⅠ≥54.9 cm,DⅠ≥7.26 mm;grade Ⅱ,46.2 cm≤HⅡ＜54.9 cm,6.93 mm≤DⅡ＜7.26 mm;grade Ⅲ,HⅢ＜46.2 cm,DⅢ＜6.93 mm.Grade Ⅰ and Ⅱ seedlings accounted for 6.93％seedlings.
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