Table 2.
Farmers’ crop management practices and soybean characteristics in the biological nitrogen fixation trial.
| n | Dowa | Mchinji | Salima | Mean | SEDa | |
|---|---|---|---|---|---|---|
| Date of sowing rains (SR) | ||||||
| 2010 | 75 | 15 Dec | 11 Nov | 21 Dec | ||
| 2011 | 75 | 5 Dec | 24 Nov | 2 Dec | ||
| Sowing date (days after SR) | Y = 0.99** R = 1.21*** R x Y = 1.71 |
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| 2010 | 75 | 26 | 22 | 8 | 19 | |
| 2011 | 75 | 28 | 24 | 13 | 22 | |
| First weeding (DAP) | Y = 1,68*** R = 2.05* R x Y = 2.89** |
|||||
| 2010 | 63 | 12 | 22 | 21 | 19 | |
| 2011 | 67 | 30 | 30 | 25 | 28 | |
| Weed pressure (1–5) | Y = 0.09 R = 0.12*** R x Y = 0.16*** |
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| 2010 | 73 | 1.9 | 1.4 | 2.4 | 1.9 | |
| 2011 | 60 | 2.2 | 1.6 | 1.8 | 1.8 | |
| Plant population (1000 pl ha−1) | Y = 17.5* R = 21.4*** R x Y = 30.3** |
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| 2010 | 75 | 412 | 266 | 205 | 294 | |
| 2011 | 75 | 308 | 207 | 257 | 257 | |
| Plant height (cm) | Y = 1.76 R = 2.15** R x Y = 3.04*** |
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| 2010 | 75 | 47 | 53 | 40 | 47 | |
| 2011 | 75 | 57 | 44 | 48 | 50 | |
| Biomass dry weight (t ha−1) | Y = 0.23*** R = 0.28*** R x Y = 0.40*** |
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| 2010 | 73 | 2.8 | 2.7 | 1.1 | 2.2 | |
| 2011 | 75 | 4.6 | 2.3 | 2.9 | 3.3 | |
| Grain yield (t ha−1) | Y = 0.11*** R = 0.13** R x Y = 0.19*** |
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| 2010 | 75 | 1.4 | 1.1 | 0.4 | 1.0 | |
| 2011 | 75 | 1.6 | 1.2 | 1.6 | 1.5 | |
a
SED = Standard error of difference between means. Y = Year, R = Region, * p < 0.05, ** p < 0.01, *** p < 0.001.