Table 3.
Different growth parameters of rice and maize as influenced by different doses of fertilizer N at different growth stages. Mean values followed by at least one lowercase letter are not significantly different at p < 0.05 by Tukey's HSD test.
| Treatments |
Rice |
Maize |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| 27 DAT |
39 DAT |
49 DAT |
59 DAT |
55 DAS |
63 DAS |
73 DAS |
82 DAS |
92 DAS |
|
| Normalized difference vegetation index (NDVI) | |||||||||
| N0a | 0.45bc | 0.48d | 0.61c | 0.66c | 0.41ns | 0.51ns | 0.49b | 0.71c | 0.67d |
| N40 | 0.42c | 0.53cd | 0.67b | 0.69bc | 0.43 | 0.50 | 0.52b | 0.73bc | 0.72c |
| N80 | 0.47bc | 0.57c | 0.72ab | 0.72ab | 0.39 | 0.51 | 0.53ab | 0.74abc | 0.75bc |
| N120 | 0.47bc | 0.58c | 0.70ab | 0.73a | 0.41 | 0.50 | 0.53ab | 0.79a | 0.79ab |
| N160 | 0.48bc | 0.61bc | 0.73ab | 0.74a | 0.39 | 0.52 | 0.59a | 0.79ab | 0.79ab |
| N200 | 0.49b | 0.67ab | 0.74a | 0.75a | 0.40 | 0.54 | 0.59a | 0.79a | 0.82a |
| N240 | 0.56a | 0.70a | 0.76a | 0.74a | 0.41 | 0.51 | 0.55ab | 0.74bc | 0.76bc |
| Mean | 0.48 | 0.59 | 0.70 | 0.72 | 0.40 | 0.51 | 0.54 | 0.75 | 0.76 |
| Chlorophyll content (mg g−1of fresh leaves) | |||||||||
| N0 | 1.80ns | 2.02c | 2.31d | 2.25c | 1.69ns | 1.21b | 1.38d | 0.96e | – |
| N40 | 1.76 | 2.56b | 2.68cd | 2.48c | 1.80 | 1.24b | 1.66bc | 1.36d | – |
| N80 | 1.85 | 2.49bc | 3.03bc | 2.63c | 1.38 | 1.66a | 1.32d | 1.79c | – |
| N120 | 1.82 | 2.65b | 3.36b | 2.58c | 1.38 | 1.48ab | 1.81b | 2.04bc | – |
| N160 | 1.55 | 3.54a | 3.33b | 3.55b | 1.56 | 1.58a | 2.63a | 2.15b | – |
| N200 | 1.64 | 3.45a | 3.43ab | 3.53b | 1.80 | 1.60a | 1.42cd | 2.52a | – |
| N240 | 1.53 | 3.49a | 3.91a | 4.34a | 1.42 | 1.66a | 1.77b | 2.68a | – |
| Mean | 1.71 | 2.89 | 3.15 | 3.05 | 1.58 | 1.49 | 1.71 | 1.93 | – |
| Tillers per hill | |||||||||
| N0 | 9.7ns | 10.5b | 12.1b | – | – | – | – | – | – |
| N40 | 8.3 | 13.5a | 11.7b | – | – | – | – | – | – |
| N80 | 10.0 | 13.9a | 12.3b | – | – | – | – | – | – |
| N120 | 9.3 | 14.4a | 15.3ab | – | – | – | – | – | – |
| N160 | 9.6 | 14.3a | 16.8a | – | – | – | – | – | – |
| N200 | 9.7 | 15.4a | 15.0ab | – | – | – | – | – | – |
| N240 | 8.6 | 14.7a | 17.3a | – | – | – | – | – | – |
| Mean | 9.3 | 13.8 | 14.3 | – | – | – | – | – | – |
| Plant biomass (g) | |||||||||
| N0 | 6.1ns | 8.0ns | 17.8c | 17.7e | 2.1b | 4.4d | 4.8e | 10.1d | – |
| N40 | 5.5 | 7.1 | 19.6bc | 19.4de | 2.2ab | 5.1cd | 6.0de | 12.2cd | – |
| N80 | 5.5 | 7.5 | 24.6ab | 22.2cde | 2.4ab | 5.5bcd | 6.8cd | 12.7c | – |
| N120 | 4.9 | 9.3 | 25.2a | 23.5bcd | 2.6ab | 5.9abcd | 7.3bcd | 13.4bc | – |
| N160 | 5.4 | 8.6 | 26.4a | 27.1abc | 2.7ab | 7.0abc | 8.6abc | 13.9bc | – |
| N200 | 5.5 | 10.8 | 26.6a | 27.9ab | 2.7ab | 7.3aab | 9.0ab | 15.1ab | – |
| N240 | 5.1 | 11.5 | 28.8a | 30.7a | 2.8a | 8.0a | 9.4a | 16.5a | – |
| Mean | 5.4 | 9.0 | 24.1 | 24.1 | 2.5 | 6.2 | 7.4 | 13.4 | – |
a
The number after N indicates kg of fertilizer N applied per ha. DAT: Days after transplanting; DAS: Days after sowing.