Revised Standards for Hybrid Rice Seed Production

Must have fertile soil suitable for parental lines.
Requires sufficient irrigation and efficient drainage.
Area should not be shaded and must be free from serious past pest and disease incidents.

At least five inspection series by trained official seed inspectors.
Inspection stages:
- Transplanting: confirm proper row orientation, planting distance, and seedling number per hill.
- Maximum tillering, pre-heading and flowering, and pre-harvest: ensure removal of off-types and other varieties.
- Harvest time: ensure timely harvesting of R lines (male parent) before A line (seed parent).

Production Area: Minimum of five hectares of compact land.
Isolation Measures to ensure genetic purity:
- Distance Isolation: Minimum 100 meters, with no other rice varieties except the pollen parent within this range.
- Time Isolation: Planting time adjusted so flowering of seed parent is separated by at least 3 weeks from other cultivars within 100 meters.
- Barrier Isolation: Utilize natural or artificial physical obstacles at least 2.5 meters high or crop barriers 2.5 meters high and 3-4 meters wide.
Rouging: Remove volunteer plants and off-types anytime, especially during maximum tillering, flowering, and pre-harvest stages.
Control of Weeds, Diseases, and Insect Pests: Maintain control to prevent field contamination.

Seeds meeting certification standards are tagged by official seed inspectors.
Tag Colors:
- Bright orange for hybrid F1 seeds.
- Old rose for hybrid rice parental seeds (A or CMS line).
Non-compliance with any requirements results in denial of seed certification.

Issued pursuant to the Implementing Rules and Regulations of R.A. 7308, the Seed Industry Development Act of 1992.
Approved by the National Seed Industry Council and signed by the Secretary of Agriculture.