Table 8.
Effect of region, maize variety and input application on maize yields and yield response to rotation. Data in brackets represent standard deviations from the mean.
| n | M-Ma plot (t ha−1) | S-Mb plot (t ha−1) | Yield response (t ha−1) | |
|---|---|---|---|---|
| Region | ||||
| Dowa | 17 | 1.47 (0.59) | 1.79 (1.12) | 0.32 (0.92) |
| Mchinji | 19 | 2.30 (1.37) | 3.59 (1.56) | 1.29 (0.87) |
| Salima | 17 | 3.75 (1.75) | 4.98 (2.29) | 1.23 (1.09) |
| SEDc | 0.45*** | 0.58*** | 0.32** | |
| Variety class | ||||
| Improvedd | 27 | 2.98 (1.65) | 4.01 (2.14) | 1.23 (1.06) |
| Local | 18 | 2.23 (1.57) | 2.88 (1.87) | 0.69 (0.97) |
| SED | n.s. | 0.80* | n.s. | |
| Input class | ||||
| No inputs | 15 | 1.66 (0.93) | 2.19 (1.24) | 0.49 (0.96) |
| With inputse | 32 | 3.06 (1.72) | 4.28 (2.10) | 1.28 (1.00) |
| SED | 0.60** | 0.55*** | 0.32* | |
a
M-M = maize after maize.
b
S-M = maize after soybean.
c
SED = Standard error of difference between means. For variety and input class ‘Region’ was added as a random factor in the REML, n.s. = not significant, * p < 0.05, ** p < 0.01, *** p < 0.001.
d
Hybrid or open pollinated varieties.
e
NPS (23:21 + 4S), urea, calcium ammonium nitrate (CAN) and/or manure.