T/NAASS 073-2023 Seed Production Techniques Specification for Ningdan 55 Maize Hybrid variety

Scope

Scope: This document specifies the terms and definitions of the hybrid corn seed (single cross) Ningdan 55's seed production technology, the variety's origin and characteristics, and the key points of seed production technology. This standard applies to the production of Ningdan 55 hybrid corn seeds, and the suitable regions are the Yonghe irrigation area of Ningxia and nearby ecological regions for spring sowing. Main technical content: 3. Terms and definitions - Single cross: The first-generation hybrid seeds of two inbred lines. - Breeder seed: The initial batch of inbred seed with specificity, consistency, and genetic stability developed by breeders. - Basic seed: Inbred seed directly bred from breeder seed or produced in accordance with the basic seed production procedures and meeting the specified standards. - Parental seed: Inbred seed expanded and meeting the specified standards for use in producing hybrid seeds for field planting. - Commercial hybrid seed: Hybrid seeds directly used for field production. 4. Variety origin and characteristics - Ningdan 55 is a single-cross corn hybrid bred by the Crop Research Institute of Ningxia Academy of Agricultural and Forestry Sciences and the Agricultural Biotechnology Research Center of Ningxia Academy of Agricultural and Forestry Sciences from the cross of HNX-17 × LY8F. It was approved by the Ningxia Crop Variety Approval Committee in 2021 (Ningxia Crop Variety Approval No. 20210002). - The seedlings have the first leaf elliptical in shape, purple leaf sheaths, dark green leaves, compact plant type, green glume, red anthers, green pistils on the female inflorescence, cylindrical ear shape, red ear axis, and yellow, semi-dental-toothed seeds. 5. Key points of seed production technology - Site selection: Choose areas with suitable natural conditions and free from quarantine pests and diseases. The seed production plots require fertile soil, uniform soil quality, and convenient irrigation and draina

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