T/NAASS 087-2024 Seed production technical specification for hybrid corn variety Yinyu 6118

Scope

Scope: This document specifies the terminology and key techniques for the production of corn hybrid seeds (single-cross hybrids) of Yinyu 6118. This standard applies to the production of Yinyu 6118 corn hybrid seeds in the Yinghe Irrigation Area of Ningxia; Main technical contents: 3 Terms and Definitions Parental seed: Seeds used for producing hybrid seeds. Commercial hybrid seed: Offspring seeds produced by crossing two or more genetically different parental seeds. 4 Seed Production Techniques 4.1 Site Selection Select sites with suitable natural conditions, fertile soil, uniform soil fertility, convenient irrigation and drainage, and free from quarantine-regulated pests, diseases, and weeds. 4.2 Isolation 4.2.1 Spatial Isolation: The seed production site should be at least 300 m away from other corn pollen sources. 4.2.2 Barrier Isolation: Select tall crops or forest belts as barrier isolators, with a barrier width of not less than 5 m and a height of not less than 3 m. At the same time, plant at least 5 m of paternal plants on the side of the barrier near the seed production site. 4.3 Pre-sowing Preparation 4.3.1 Tillage and Sealing Early spring mechanical tillage and harrowing to maintain soil moisture. Conduct soil herbicide treatment 5–7 days before sowing. 4.3.2 Parental Seed Preparation Parental seeds should be coated before sowing. 4.4 Sowing 4.4.1 Sowing Time: Sow in mid-to-late April when the 5 cm–10 cm soil temperature stabilizes above 10°C. 4.4.2 Sowing Method: Use precision sowing machines to sow both parental lines simultaneously, followed by a second sowing of paternal plants 7 days later. 4.4.3 Parental Line Ratio: The parental line planting ratio is 1:6. 4.4.4 Sowing Density: Plant in rows with a row spacing of 60 cm and a plant spacing of 18.5 cm–20 cm, with a planting density of 5,500–6,000 plants/667 m2. 4.5 Fertilization 4.5.1 Seed Fertilization: Use seed-fertilizer co-application or separate seed fert

Development Information

Related Standards