IR8: breeding and testing a productive semidwarf rice variety

What changed

IRRI’s breeding, selection and field-testing programme produced IR8, released in 1966. Its short stature and yield response helped change rice improvement and seed deployment in suitable production environments.

Scientific scope

The breeding and agronomic testing of IR8 as a productive semidwarf rice variety.

Evidence

Original sources and institutional historical accounts support the stated contribution. The reading boundary is recorded at each source; this assessment is not an independent scientific verification.

Contributors

• Peter Jennings · SCIENCE: Named source contributor to this scoped work; individual labor shares are not measured.
• Henry Beachell · SCIENCE: Named source contributor to this scoped work; individual labor shares are not measured.
• S. K. De Datta · SCIENCE: Named source contributor to this scoped work; individual labor shares are not measured.

• IRRI: The breeding history of IR8

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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