Table 1.
Mean biomass production (g d. wt m−2) in autumn- and spring-sown cultivars of cocksfoot (cultivars ‘Oasis’, hybrid PG325 and ‘Kasbah’) subjected to full irrigation or rehydrated after a drought period between 30 May and 22 September 2003
| Autumn sowing |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Production period |
||||||||||||||
| 24 October to 28 May | 28 May to 21 July | 21 July to 18 August | 18 August to 11 September | 28 May to 11 September | 22 September to 22 October | 22 October autumn/spring | ||||||||
| Irrigated |
Irrigated |
Irrigated |
Irrigated |
Drought |
After rehydration |
|||||||||
| ‘Oasis’ | 32·7 (2·0) | 37·0 (2·3) | 10·1 (0·6) | 7·0 (0·4) | 0 | 16·4 (4·3) | 0·91 (0·3) | |||||||
| Hybrid | 48·3 (7·9) | 24·7 (4·0) | 7·2 (1·2) | 8·2 (1·3) | 0 | 35·4 (21·7) | 1·33 (0·4) | |||||||
| ‘Kasbah’ | 30·7 (3·5) | 0 (0) | 0·7 (0·1) | 2·4 (0·3) | 0 | 19·6 (6·1) | 2·44 (0·5) | |||||||
| l.s.d. | 10·23 | 5·4 | 1·5 | 1·7 | 0·76 | |||||||||
| Spring sowing |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Production period |
||||||||||
| 17 March to 21 July | 21 July to 18 August | 18 August to 11 September | 28 May to 11 September | 22 September to 22 October | ||||||
| Irrigated |
Irrigated |
Irrigated |
Drought |
After rehydration |
||||||
| ‘Oasis’ | 55·2 (14·9) | 12·0 (3·2) | 4·4 (1·2) | 0 | 19·5 (9) | |||||
| Hybrid | 24·5 (0·5) | 10·6 (0·2) | 6·5 (0·1) | 0 | 25·7 (10·1) | |||||
| ‘Kasbah’ | 0 (0) | 0·5 (0·01) | 1·6 (0·2) | 0 | 7·9 (0·9) | |||||
| l.s.d. | 17·2 | 3·7 | ||||||||
The last column presents the ratio of autumn biomass (on 22 October following rehydration) between plants previously sown in autumn and those previously sown in spring.
Standard deviations are given in parenthesis. Least significant difference values (l.s.d.) are given when significant differences occur between cultivars at P < 0·05.