Table 2. Effects of CO2 concentrations (EC, elevated; AC, ambient) and Kinetin (KN, treat; CN, control) on yield and yield component of Koshihikari and Takanari. 1Expressed on a 15% moisture content basis; 2CE: EC effect, (EC/AC-1) x 100; 3Measured for grains > 1.7 mm in width after sieving; 4Kinetin effect: (KN/CN-1) x 100; 5Statistically significant effects are indicated ***, P < 0.001; **, P < 0.01; *, P < 0.05; The value indicates the probability between 0.05 and 0.1; ns, not significant.