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Simulated instantaneous light absorption by leaves in a small rice canopy (age: 100 d) on 23 August 1998, 13:00 h, with two different plant spacings (upper: 0·15 × 0·2 m; lower: 0·3 × 0·4 m), represented as a colour gradient (see key). Incident radiation was 545 W m−2 (about 1240 µmol m−2 s−1 PAR).
