Table 2.
Crop and climate variables characterizing each experimental year during the grain-filling period
| 1997 (0–1)* | 1999 (0) | 1999 (1) | 2001 (0–1) | 2004 (0–1) | |
|---|---|---|---|---|---|
| Anthesis date | 25 May | 21 May | 26 May | 28 May | 27 May |
| Grain filling duration (d) | 48 | 46 | 45 | 44 | 46 |
| Cumulated global radiation (MJ) | 935 | 1002 | 993 | 975 | 933 |
| Mean daily temperature (°C; ± s.d.) | 16·0 (2·3) | 16·6 (2·6) | 17·0 (2·5) | 17·5 (3·3) | 16·7 (2·6) |
| Cumulated rainfall (mm) | 122 | 56·5 | 56·5 | 119·6 | 61·4 |
| Potential evapo-transpiration (mm) | 186 | 197·5 | 197·5 | 198·6 | 194·4 |
* High (1) and low (0) nitrogen fertilizations were applied each year as follows: Treatment 1 consisted each year in a total 24 g m−2 N supply in 3 applications: 6 g m−2 at GS 25; 10 g m−2 at GS 30; 8 g m−2 at GS 55, ** Treatment 0 consisted in the same two first N applications as treatment 1, and a third application at GS 55 of only 3 g m−2 (1996–1997), 0 g m−2 (1998–1999), 3 g m−2 (2000–2001), 0 g m−2 (2003–2004).