Sln.1R is an Indian polyclonal Robusta built from a Congensis x Robusta backcross, planted as two co-dependent clones.
Sln.1R is an Indian dwarf/compact polyclonal Robusta selection developed by the Central Coffee Research Institute in the late 1940s, composed of two clones (S.270 and S.274) that must be planted together for fruit set, derived from Coffea congensis x Coffea canephora with recurrent backcrossing to Robusta (selection from BC2). Over 35 years of rain-fed testing the pair averaged nearly 1000 kg/ha.
Field notes
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Sln.1R, popularly known as S.274 or Selection Robusta, was CCRI's first robusta selection. Its two founding plants, S.270 and S.274, were bold-beaned high yielders picked from 12 mother plants gathered on private estates.
Grown in
- Indiaorigin
Sources · 2 Every sentence here was checked against a source we read. Taste notes are what guides describe, not promises about your bag. Last revised 2026-11-11.
- Robusta Varieties — A global catalog of Robusta coffee varieties from around the world (PDF, rev. Sept 4, 2025) · World Coffee Research
- World Coffee Research variety page: Sln.1R · World Coffee Research