Table 2. Significance levels of terms included in the final models used in the analysis of variance of yield and grain protein concentration (GPC) of barley along with soil mineral nitrogen concentrations two months after incorporation of second crops (N.2), before sowing the final barley crop (N.BS), and difference between incorporation and sowing (N.D).
| Source of variation | DF | Yield | GPC | N.2 | N.BS | N.D |
|---|---|---|---|---|---|---|
| Site | 1 | *** | *** | *** | *** | |
| First crop | 2 | *** | *** | *** | *** | * |
| Second crop | 5 | ** | *** | *** | *** | *** |
| Stage of incorporation | 1 | *** | *** | * | *** | |
| Site × First crop | 2 | *** | ** | *** | ||
| Site × Second crop | 5 | *** | *** | |||
| First crop × Second crop | 10 | * | * | |||
| Site × Stage of incorporation | 1 | *** | *** | *** | ||
| First crop × Stage of incorporation | 2 | * | * | |||
| Second crop × Stage of incorporation | 2 | *** | ** | |||
| Site × First crop × Second crop | 10 | ** | ||||
| Site × First crop × Stage of incorporation | 2 | * | ** | |||
| Site × Second crop × Stage of incorporation | 2 | |||||
| First crop × Second crop × Stage of incorporation | 4 | * | ||||
| Site × First crop × Second crop × Stage of incorporation | 4 | * | ||||
| Replicate | 3 | |||||
| Residual | 159 |
*, **, ***: P < 0.05, 0.01, 0.001, respectively.