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LY/T 1890-2010: Tree seedling quality grading of cedrus deodara for landscaping
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Tree seedling quality grading of cedrus deodara for landscaping
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LY/T 1890-2010
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Basic data | Standard ID | LY/T 1890-2010 (LY/T1890-2010) | | Description (Translated English) | Tree seedling quality grading of cedrus deodara for landscaping | | Sector / Industry | Forestry Industry Standard (Recommended) | | Classification of Chinese Standard | B61 | | Classification of International Standard | 65.020.40 | | Word Count Estimation | 6,669 | | Date of Issue | 2010-02-09 | | Date of Implementation | 2010-06-01 | | Quoted Standard | GB 6000; GB/T 16620 | | Regulation (derived from) | State Forestry Administration Notice 2010 No. 2; industry standard filing Notice 2010 No. 5 (No. 125 overall) | | Issuing agency(ies) | State Forestry Administration | | Summary | This standard specifies the cedar (Cedrus deodara) green seedlings quality grading terminology and definitions, grading requirements, test methods and inspection rules. This standard applies to height 200cm ~ 800cm cedar seedling quality grading. | LY/T 1890-2010: Tree seedling quality grading of cedrus deodara for landscaping---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Tree seedling quality grading of cedrus deodara for landscaping
ICS 65.020.40
B61
People's Republic of China Forestry Industry Standard
Cedar green seedling quality grading
Released on.2010-02-09
2010-06-01 implementation
State Forestry Administration released
Foreword
Appendix A of this standard is a normative appendix, and Appendix B is an informative appendix.
This standard is proposed and managed by the National Forest Seed Standardization Technical Committee.
This standard is drafted by. Nanjing Pukou District Horticultural Special Product Station.
Participated in the drafting of this standard. Nanjing Forestry Station.
The main drafters of this standard. Lu Tianbao, Di Zenglong, Ji Dong, Hua Hong, Yu Jinsong, Jiang Dingshan, Cheng Ziding, Yang Jianhong.
Cedar green seedling quality grading
1 Scope
rule.
This standard is applicable to the quality classification of cedar seedlings with a plant height of.200cm to 800cm.
2 Normative references
The terms in the following documents become the terms of this standard by reference to this standard. All dated references, followed by all
Modifications (not including errata content) or revisions do not apply to this standard, however, parties to agreements based on this standard are encouraged to study
Is it possible to use the latest version of these files? For undated references, the latest edition applies to this standard.
GB 6000 Main afforestation tree seedling quality grading
GB/T 16620 Forest Tree Breeding and Seed Management Terminology
3 Terms and definitions
The following terms and definitions established in GB/T 16620 and GB 6000 apply to this standard.
3.1
The average value of the largest round of canopy orthographic projection or the average of the largest round of canopy orthographic projection in the east-west direction and north-south direction, ie the maximum
Crown diameter.
3.2
The vertical distance of the first branch of the branch from the ground.
3.3
When excavating seedlings, the roots are cut to a certain size to keep the soil in a spherical shape, and the roots of the seedlings are bundled and packaged.
3.4
The diameter of the mud ball carried by the root when the seedling is transplanted.
4 grading requirements
4.1 The seedlings of the same seedling height are divided into three grades, see Appendix A.
4.2 Qualified seedlings are determined by comprehensive control conditions, crown width, branch height, ground diameter and soil ball.
4.3 If the comprehensive control conditions fail to meet the requirements, the unqualified seedlings will meet the requirements of the crown, the height of the branches, the ground diameter and the soil ball.
Grading.
4.4 The comprehensive control conditions are. no pests and diseases of quarantine objects, crown-shaped towers, straight trunks, obvious main shoots, even distribution of lateral branches, no deviations,
No damage to the branches.
4.5 When grading, first look at the crown width, with a crown height ratio greater than or equal to 0.65 as a grade I seedling, and a crown height ratio between 0.51 and 0.64 as a grade II seedling, crown
The height ratio is between grades of 0.35 and 0.50. After the crown reaches the requirement, it is graded according to the height of the branches, the ground diameter and the soil ball index. Branch of seedlings of grade I
The lower height is less than 15% of the height of the seedling, the diameter of the soil ball is more than 9 times the diameter of the soil, the thickness of the soil ball is 55% of the diameter; the seedling of the second-grade seedling is high.
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