T/CQAAS 012-2023 Active

Main Technical Content: 3. Terms and Definitions The following terms and definitions apply to this document. 3.1 Batch of Nursery Stock A batch of nursery stock refers to homogeneous seedlings of the same variety, grown in the same nursery using the same batch of propagation material and employing essentially identical nursery techniques. 3.2 Mature Age of Seedlings The age of seedlings from sowing to planting out. A mature age unit is defined as one growth cycle. The mature age is represented by Arabic numerals, where the first digit indicates the age of the seedlings at the original site, the second digit represents the number of years after the first transplantation, and the third digit represents the number of years after the second transplantation. The digits are separated by a horizontal line, and the sum of all digits represents the seedling's age, referred to as "years". For example: 1-0 indicates a 1-year-old seedling that has not been transplanted. 2-0 indicates a 2-year-old seedling that has not been transplanted. 2-2 indicates a 4-year-old transplanted seedling that has been transplanted once and cultivated for two years after transplantation. 2-2-2 indicates a 6-year-old transplanted seedling that has been transplanted twice, with two years of cultivation after each transplantation. 0.2-0.8 indicates a 1-year-old transplanted seedling that has been transplanted once and cultivated for 2/10 of a growth cycle after transplantation. 3.3 Diameter at Ground Level The diameter of the seedling stem at the base of the root collar. 3.4 Seedling Height The length of the seedling stem from the base of the root collar to the terminal bud. 3.5 Root Length and Spread The length and spread of the roots that should be retained after seedling removal and root pruning. 3.6 Seedling Propagation Seedling propagated from seeds. In practice, only seedlings derived from excellent hybrid combinations or elite family seeds are used for prop