T/QHNX 053-2025 Seed production quality control specifications for cabbage inter-specific hybridization

Scope

This document specifies the terms and definitions for the quality control of hybrid seed production of headed cabbage, stipulates the requirements for production personnel, quality control procedures, seed production requirements, seed storage and processing requirements, seed quality result reports, and seed quality traceability information. This document is applicable to the quality control of hybrid seed production of headed cabbage in Qinghai Province. 5.3 Seedling Quality Control 5.3.1 Timely Sowing According to the maturity and flowering period of the parent lines and the type of facilities, overwintering methods, and climate characteristics in the local area, select the sowing period of the parent lines. 5.3.2 Removing Hybrids and Poor Seedlings During the Seedling Stage 7 days before transplanting in the field, examine the parent lines based on typical characteristics such as leaf color, leaf shape, leaf veins, leaf edges, and leaf aggregation state. The hybrid rate of the parent lines should not exceed 0.2%. Remove overgrown seedlings and diseased or damaged seedlings. 5.3.3 Selecting and Transplanting Seedlings According to the growth characteristics of different headed cabbage varieties, select seedlings that meet the standards for strong seedlings in DB63/T 1587 and transplant them at the appropriate time. 5.3.4 Seedling Nursery Quality Control Records 5.4 Field Quality Control 5.4.1 Parent Line Proportion Conduct quality inspections at the transplanting and bolting stages, and the parent line proportion should be within the range of 1:1 to 1:6. 5.4.2 Hybrid Seedlings and Hybrid Pollen Dispersion Rate Conduct quality inspections at the seedling, budding, flowering, and harvesting stages according to the biological characteristics of the parent lines. Select 5 sampling points in each quality control unit, and take 100 seedlings from each parent line at each sampling point. Based on the typical characteristics of the root, stem,

Development Information

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