Table 4.
Effect of nitrogen deposition rates and cropping system of invasive and native weeds on plant height and biomass
| Treatment | Chlorophyll | Plant Height | Wet Biomass | Dry Biomass | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| N deposition rate | Aug | Oct | Dec | Aug | Oct | Dec | Shoot | Root | Shoot | Root | |
| Nº | 37.1 C | 37.2 | 34.5 C | 4.33 C | 13.4B | 16.7 C | 10.8 C | 8.77 C | 6.29 C | 6.63 C | |
| N5 | 39.7 A | 37.8 | 36.0B | 4.83B | 15.5 A | 21.5B | 26.3B | 21.6B | 10.0B | 13.4B | |
| N10 | 37.7B | 40.4 | 39.3 A | 5.45 A | 15.8 A | 22.3 A | 35.6 A | 25.4 A | 14.0 A | 14.5 A | |
| Cropping system (CS) | |||||||||||
| SC | 39.5 A | 40.4 | 36.7B | 5.23B | 17.7B | 24.3B | 36.9 A | 25.3 A | 12.4 A | 13.3 A | |
| WC | 37.4 C | 37.9 | 36.7B | 4.60 C | 13.0 C | 16.9 C | 18.8 C | 14.7D | 11.0B | 11.6 C | |
| I-SC | 37.2 C | 38.2 | 38.3 A | 5.63 A | 19.0 A | 26.4 A | 15.1D | 17.0 C | 7.3D | 12.5B | |
| I-WC | 38.4B | 37.2 | 34.8 C | 4.00D | 9.90D | 13.1D | 26.07 C | 17.5B | 9.55 C | 8.62D | |
| Interaction (N × CS) | |||||||||||
| Nº | SC | 36.8 g | 38.6 | 35.4d | 4.60 | 15.9c | 20.0d | 11.0i | 6.00j | 6.01 h | 3.99i |
| Nº | WC | 37.1f | 36.9 | 33.5e | 4.30 | 12.4e | 15.2f | 13.4 g | 16.8f | 9.17f | 13.0e |
| Nº | I-SC | 36.8 g | 37.2 | 35.9d | 4.80 | 15.6c | 19.1e | 10.0j | 6.99i | 5.21i | 5.62 h |
| Nº | I-WC | 37.4ef | 35.9 | 31.3f | 3.60 | 9.70f | 12.5 h | 8.84k | 5.31j | 4.75j | 3.89i |
| N5 | SC | 42.6a | 39.6 | 35.7d | 5.30 | 18.6b | 26.6c | 47.5c | 35.5a | 12.6d | 18.1a |
| N5 | WC | 39.0c | 36.7 | 38.0bc | 4.50 | 13.1d | 17.0f | 24.8d | 18.1e | 13.1c | 13.8d |
| N5 | I-SC | 37.3f | 38.0 | 37.5c | 5.50 | 21.1a | 31.1a | 13.2 h | 17.3f | 7.16 g | 15.0c |
| N5 | I-WC | 39.8b | 36.7 | 34.7de | 4.00 | 9.20f | 11.4i | 19.6f | 15.4 g | 7.01 g | 6.74 g |
| N10 | SC | 39.7b | 42.9 | 38.9b | 5.80 | 18.5b | 26.3c | 52.1a | 34.2b | 18.6a | 17.8a |
| N10 | WC | 36.0 h | 40.1 | 38.5bc | 5.00 | 13.5d | 18.5e | 18.2 g | 9.29 h | 10.8e | 7.85f |
| N10 | I-SC | 37.6de | 39.5 | 41.5a | 6.60 | 20.3a | 29.0b | 22.1e | 26.7d | 9.59f | 16.9b |
| N10 | I-WC | 37.9d | 39.2 | 38.3bc | 4.40 | 10.8e | 15.4 g | 49.8b | 31.6c | 16.9b | 15.2c |
| ANOVA | DF | P | P | P | P | P | P | P | P | P | P |
| N | 2 | 523** | 352*** | 1110*** | 20.0*** | 352*** | 87.8*** | 3949*** | 3621*** | 3653*** | 9053*** |
| CS | 3 | 174*** | 57.0*** | 20.4*** | 88.9*** | 1115*** | 433*** | 3632*** | 999.4*** | 637.4*** | 621.1*** |
| N × CS | 6 | 108*** | 7.23*** | 3.41* | 1.66NS | 354*** | 5.03*** | 1787*** | 1414*** | 462.4*** | 1232*** |
Lowercase letters indicate significant for the interaction of precipitation levels and cropping system variability (p < 0.05). Uppercase letters indicate variability between nutrient levels and cropping system (p < 0.05). Nitrogen (N), cropping system (CS), nitrogen × cropping system (N × CS)Nº= no N application; N5 = normal N application; N10 = higher N application; control (CK); pot having no plant, invasive S. canadensis mono-cropping (SC), native Wedelia chinesis mono-cropping (WC), invasive intercropping (I-SC), native intercropping system (I-WC)