Table 2.
The simulated historical (1979–2010) mean performance of winter wheat yield (kg ha−1) under ambient (aCO2) and elevated carbon dioxide (eCO2) at a high rainfall site near Pullman, at a low rainfall site near Lind and at an irrigated site near Moses Lake, WA.
| aCO2 (µmol mol−1) | eCO2 (µmol mol−1) | ||||||
|---|---|---|---|---|---|---|---|
| 400 | 500 | 600 | 700 | 800 | 900 | 1000 | |
| Pullman WA | |||||||
| APSIM | 6368 (209) | 7222 (235) | 8040 (253) | 8782 (264) | 9417 (268) | 9882 (271) | 10132 (274) |
| CropSyst | 6268 (225) | 7223 (248) | 8040 (264) | 8782 (278) | 9417 (289) | 9882 (294) | 10132 (294) |
| DSSAT | 6214 (216) | 6768 (232) | 7298 (245) | 7772 (255) | 8184 (265) | 8551 (272) | 8835 (277) |
| EPIC | 6148 (239) | 6764 (243) | 7239 (246) | 7610 (248) | 7900 (250) | 8127 (251) | 8302 (253) |
| STICS | 7101 (226) | 8340 (278) | 9284 (303) | 10013 (323) | 10606 (345) | 11044 (351) | 11353 (343) |
| Lind WA | |||||||
| APSIM | 2339 (134) | 2757 (136) | 3112 (146) | 3503 (158) | 3795 (171) | 3963 (183) | 4129 (195) |
| CropSyst | 2842 (167) | 3320 (194) | 3759 (217) | 4189 (237) | 4584 (253) | 4897 (266) | 5058 (275) |
| DSSAT | 2643 (226) | 2988 (251) | 3339 (277) | 3675 (304) | 3980 (329) | 4269 (354) | 4524 (376) |
| EPIC | 3159 (249) | 3748 (264) | 4329 (265) | 4937 (267) | 5472 (311) | 5948 (351) | 6162 (370) |
| STICS | 2369 (150) | 2892 (135) | 3480 (236) | 4017 (165) | 4217 (206) | 4314 (236) | 4381 (267) |
| Moses Lake, WA | |||||||
| APSIM | 7853 (166) | 8609 (168) | 9109 (179) | 9209 (185) | 9311 (193) | 9413 (197) | 9429 (203) |
| CropSyst | 10559 (184) | 11424 (195) | 11911 (202) | 12213 (206) | 12416 (208) | 12561 (210) | 12668 (212) |
| DSSAT | 8322 (350) | 9125 (352) | 9888 (357) | 10541 (367) | 11107 (377) | 11594 (387) | 11970 (395) |
| EPIC | 7995 (142) | 8866 (164) | 9224 (230) | 9510 (293) | 9877 (305) | 10297 (345) | 10120 (367) |
| STICS | 7353 (155) | 7989 (158) | 8529 (161) | 9020 (165) | 9466 (168) | 9768 (192) | 9915 (227) |
(Note: Standard errors (SE) of mean of the simulated data are in parentheses).