Table 9.
The effect of the nitrogen level on the boll shell protease and peptidase activities of the two Bt cotton cultivars in 2015.
| Cultivar | N rate (kg/ha) | Protease activity (mg g−1 FW h−1) | Peptidase activity (μmol g−1 FW h−1) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 10 DAF | 20 DAF | 30 DAF | 40 DAF | 10DAF | 20DAF | 30DAF | 40DAF | ||
| SK-1 | 0(CK) | 0.75g | 1.59a | 0.96e | 1.06f | 0.88g | 1.02e | 1.07g | 1.21g |
| 75 | 0.85e | 1.49b | 1.05d | 1.12e | 0.94d | 1.07d | 1.12e | 1.25e | |
| 150 | 0.92cd | 1.40c | 1.13c | 1.21d | 0.95d | 1.10c | 1.17d | 1.30c | |
| 225 | 0.99b | 1.32d | 1.21b | 1.29c | 1.01c | 1.15b | 1.20c | 1.34b | |
| 300 | 1.13a | 1.25e | 1.30a | 1.43a | 1.07a | 1.18a | 1.25b | 1.36a | |
| SK-3 | 0(CK) | 0.81f | 0.97h | 0.98e | 0.98g | 0.88g | 0.93g | 1.09f | 1.18h |
| 75 | 0.85e | 1.02g | 1.07d | 1.09e | 0.90f | 0.97f | 1.13e | 1.23d | |
| 150 | 0.89d | 1.06g | 1.21b | 1.19d | 0.93e | 1.08d | 1.16d | 1.28d | |
| 225 | 0.94c | 1.18f | 1.22b | 1.29c | 1.03b | 1.11c | 1.21c | 1.31c | |
| 300 | 0.99b | 1.20ef | 1.29a | 1.38b | 1.06a | 1.15b | 1.27a | 1.34ab | |
Symbol SK-1 and SK-3 are cultivar Sikang1 and Sikang3 respectively, CK is Control. DAF is acronym of “days after flowering.” Same letter among treatments within each sampling date represent non-significant difference (LSD test at 0.05 significance level).