T/YLZZ 0005-2023 Zhaosu Rapeseed Hybrid Seed Production Technical Specifications

Scope

Main Technical Content: Zhaosu Rapeseed Hybrid Seed Production Technical Guidelines 1 Scope This document specifies the terms and definitions, base selection, pre-sowing preparation, sowing methods, field management, harvesting and selection, and storage requirements for rapeseed hybrid seed production in Zhaosu County. 2 Normative Reference Documents The content of the following documents is an integral part of this document through normative reference. Among them, the dated reference documents apply only to the version corresponding to that date; the undated reference documents apply to the latest version (including all amendment sheets). - GB/T 1.1-2009, Standardization Work Guidelines - Part 1: Structure and Preparation of Standards - GB 4407.2, Crop Seed Quality Standards - Economic Crop Seeds - Part 2: Oilseeds - GB/T7415, Storage of Crop Seeds - GB/T 11762, Rapeseed Seeds 3 Terms and Definitions 3.1 Spatial Isolation The safe distance in rapeseed hybrid seed production where other cruciferous crops' pollen cannot contaminate the seeds. 3.2 Secondary Seedlings Seedlings that fall into the soil, sprout naturally, and grow. 3.3 Stunted Segments A short segment of rapeseed plants with multiple nodes near the ground. 3.4 Impurities Hybrid plants, dominant plants, and mutant plants. 3.5 Poor Plants Plants with poor growth, deformed structures, or pest/disease damage. 4 Base Selection Requirements for seed production sites: open and ventilated, well-organized plots, flat terrain, medium-to-high fertility, and easy irrigation/drainage. No rapeseed or cruciferous crops have been grown in the area for 1-2 years prior to selection to avoid secondary seedling contamination and reduce pest/disease risks. 5 Pre-sowing Preparation 5.1 Safety Isolation The minimum safe isolation distance for Zhaosu rapeseed hybrid seed production fields should be at least 1,500 meters. No rapeseed or cruciferous crops (such as cabbage or mu

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