Table 1.
ANOVA of the Shannon-Weiner Diversity Index for different tillage and weed management options in rice in a rice-maize rotation in Northwestern Bangladesh.
| Variation sources | Shannon-Weiner Diversity Index | |
|---|---|---|
| Year (Y) | 2010 | 1.23 ab |
| 2011 | 0.99 c | |
| 2012 | 1.06 bc | |
| 2013 | 1.41 a | |
| Tillage and crop establishment (TCE) | ZT-DSR | 1.25 a |
| Puddled TPR | 1.09 b | |
| Weed management regime (WMR) | Weedy | 1.25 a |
| MW | 1.25 a | |
| C + MW | 1.01 b | |
| F-Values | Y | 10.83*** |
| TCE | 8.17*** | |
| WMR | 7.75*** | |
| Y × TCE | 1.94NS | |
| Y × WMR | 0.86NS | |
| TCE × WMR | 0.60NS | |
| Y × TCE × WMR | 0.61NS | |
Different letters in a column indicate statistically significant differences according to Tukey's HSD at alpha = 0.05; ***, ** and * indicate significances respectively at P < 0.001, 0.01 and 0.05. NS indicates non-significance. ZT-DSR = Zero-tilled direct seeded rice; Puddled TPR = Puddled transplanted rice; Weedy = No weed control; MW = Two hand weeding; C + MW= Chemical followed by manual weeding.