Table 9.
Factors affecting maize yields and absolute and relative response of maize yield to crop rotation.
| Dependent variable | Type of relationa | n | Fpr | Random Factorsb |
|---|---|---|---|---|
| Explanatory variables | ||||
| Maize yield (t ha−1) | ||||
| Region | C | 106 | <0.001 | − |
| Treatment (soya or maize in 2010) | C | 106 | 0.002 | R |
| Variety (local or improved) | C | 70 | 0.02 | R,T |
| Input application (yes or no) | C | 92 | <0.001 | R,T |
| Absolute response to rotation (t ha−1) | ||||
| Region | C | 53 | 0.007 | − |
| Inputs applied to maize plots (yes or no) | C | 47 | 0.018 | R |
| Mean site maize yield | + | 53 | <0.001 | R |
| Value of assets (USD) | + | 53 | 0.029 | R |
| Relative response to rotation (%) | ||||
| Region | C | 53 | 0.03 | |
| Maize yield in control plot | − | 53 | 0.019 | R |
a
For continuous variables ‘+’ indicates a positive and ‘−’ a negative correlation with the dependent variable; Categorical factors are indicated with “C”.
b
Random factors included in the REML model: R = Region, Y = Year, T = Technology treatment.