T/NAASS 140-2025 Technical specifications for hybrid seed production of cherry tomato

Scope

This document specifies the technical requirements for the production of hybrid cherry tomato seeds, including parental requirements, seedling cultivation, site selection and preparation, planting, field management, powder making, pollen removal and pollination, post-pollination plant management, harvesting, and post-harvest processing. This standard applies to the production of hybrid cherry tomato seeds in the Yinghe Irrigation Area of Ningxia. 3 Terms and Definitions There are no terms or definitions that need to be defined in this document. 4 Parental Requirements Parental seeds shall be of original seed quality. 5 Seedling Cultivation 5.1 Sowing Period Sow in large greenhouses in early March; sow in open fields in late March. 5.2 Methods Adopt factory-style seedling cultivation, using 98 or 72-hole seed trays. The substrate shall be prepared with a volume ratio of 3:1:1 (or 7:2:2) of high-quality peat, vermiculite, and perlite. Add 2 kg of nitrogen-phosphorus-potassium balanced fertilizer per 1 cubic meter of substrate. 5.3 Temperature Management From sowing to emergence, control the daytime temperature at 25°C to 30°C and the nighttime temperature above 18°C; from emergence to 3-leaf 1-heart stage, control the daytime temperature at 25°C to 28°C and the nighttime temperature at 15°C to 20°C; and 5-7 days before planting, control the daytime temperature at 20°C to 25°C and the nighttime temperature at 12°C to 15°C. 5.4 Water and Fertilizer Management After sowing, water thoroughly; after emergence, water appropriately every day; and after the cotyledons flatten, apply nitrogen-phosphorus-potassium balanced fertilizer once every 3-6 days at a concentration of 0.5‰ to 2.0‰. The fertilizer shall comply with the requirements of NY/T 1107. 5.5 Requirements for Strong Seedlings The seedlings should have short stems and nodes, strong growth, well-developed white roots with good root system, dark green leaves, no diseases or pests, and no mechanical damage. The

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