GB/T 26907-2025Quality grading of youcha seedling (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 26907-2011 “Quality Grading of Camellia oleifera Seedlings”. Compared with GB/T 26907-2011, except for the structural adjustment and In addition to editorial changes, the main technical changes are as follows.

— Deleted the technical information of seedlings, seedling age, ground diameter, seedling height, stem growth point, root length, seedlings, bud seedlings, grafted seedlings, cuttings, and container seedlings.

Terms and definitions (see 3.1 to 3.4, 3.4.1, 3.5, 3.6, 3.7.1, 3.8, and 3.9 of the 2011 edition);

— Changed the terms and definitions of large roots and grafted seedlings (see 3.3, 3.4, 3.5.1, 3.7 of the 2011 edition);

— Added terms and definitions for Camellia oleifera, Camellia oleifera seedlings and bare-root seedlings (see 3.1, 3.2, 3.5);

— Deleted the seedling types of seedlings and cuttings, and the percentages of Grade I and Grade II seedlings (see Table 1 of the 2011 edition);

— Added the types and grade indicators of two-year-old bare-root cuttings (see Table 1);

— Changed the grading index for 2-year-old grafted seedlings and bare-root seedlings (see Table 1, Table 1 of the 2011 edition);

— Added 2-year-old container seedlings and 3-year-old container seedlings, as well as 2-year-old cutting container seedlings, 2-year-old grafted container seedlings, 3-year-old grafted container seedlings seedling grade indicators (see Table 2);

— Changed the one-year-old grafted container seedlings seedling grade indicators (see Table 2, Table 1 of the 2011 edition);

— Changed the quality requirements for seedling type, seedling age, seedling height, ground diameter, grade I seedlings, grade II seedlings, and comprehensive indicators (see Table 1 and Table 2, 2011 Table 1 of the 2010 edition);

— Added the quality requirement of "number of grade I lateral roots >=5 cm long" for bare-root seedlings (see Table 1);

— Increased container specifications (see Table 2);

— Changed the test method (see Chapter 6, Chapter 5 of the 2011 edition);

— Changed the inspection rules (see Chapter 7, Chapter 6 of the 2011 edition);

— Added judgment rules (see 7.4);

— Changed the packaging requirements (see Chapter 8, Chapter 7 of the 2011 edition).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the State Forestry and Grassland Administration.

This document is under the jurisdiction of the National Technical Committee for Standardization of Economic Forest Products (SAC/TC557).

The drafting units of this document. Hunan Academy of Forestry Sciences, Guangxi Zhuang Autonomous Region Forestry Research Institute, and Jiangxi Academy of Forestry Sciences.

The main drafters of this document are: Chen Yongzhong, Wang Rui, Zhang Zhen, Peng Shaofeng, He Zhilong, Xu Yanming, Chen Longsheng, Ma Jinlin, Xu Linchu, She Jiarong, Wang Xiangnan, Zhang Ying, Liu Caixia, Tang Wei, Xun Chengfeng, Peng Yinghe, Liu Jianbing, Ma Li, Li Zhigang, and Ma Yushen.

The previous versions of this document and the documents it replaces are as follows.

— First published in 2011 as GB/T 26907-2011;

— This is the first revision.

1 Scope

This document specifies the classification and quality requirements, inspection rules, packaging, marking and transportation of oil-tea camellia seedlings, and describes the corresponding testing method.

This document applies to the production and distribution of improved seedlings in oil-tea camellia producing areas. Similar and closely related species may also follow this document.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Categories

Oil tea seedlings are divided into two types. bare-root seedlings and container seedlings.

5 Quality Grades

The quality of oil-tea seedlings is divided into two grades. The grade index of oil-tea bare root seedlings should meet the requirements of Table 1, and the grade index of oil-tea container seedlings should meet the requirements of Table 1. The provisions of Table 2.