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A measurements made for 2 h on either side of solar noon on days with clear skies in June, 1994. Measurements were taken on mature lamina of L. perenne. Plants were grown and measured at current (C; 36 Pa) and at elevated (E; 60 Pa) pCO2. There were two levels of N application; low N (LN; 140 kg hectare−1) and high N (HN; 520 kg hectare−1). Measurements were made before a harvest (UNCUT) and again 7 d after the canopy was partially defoliated (CUT); n = 3 blocks.
