Table 2. Statistical ANOVA output for the assessed variables in winter wheat and maize.
| Crop | Parameter | Experiment (E) | Block (E:B) | P. system (PS) | cover crop (CC) | PS × CC |
|---|---|---|---|---|---|---|
| Wheat | Yield | ns | ns | 33.0(3,21)*** | 3.6(3,84)* | ns |
| Nconcentration | 299.6(1,21)*** | 4.0(6,21)** | 37.4(3,21)*** | ns | ns | |
| Nuptake | 26.1(1,21)*** | 4.1(6,21)** | 59.4(3,21)*** | ns | ns | |
| NeffCC | ns | ns | ns | 2.4(3,84)° | ns | |
| Weed cover in crop | ns | ns | 6.5(6,21)** | 7.4(3,84)*** | 4.3(9,84)*** | |
| Cover crop biomass | 154.9(6,21)*** | 3.2(3,21)* | ns | 37.9(3,56)*** | ns | |
| Weed biomass in CC | 43.9(6,21)*** | 3.1(6,21)* | ns | 45.6(3,84)*** | ns | |
| Maize | Yield | 29.3(1,21)*** | ns | 75.3(3,21)*** | 30.7(3,84)*** | 2.7(9,84)** |
| Nconcentration | 318.8(6,21)*** | 2.2(3,21)° | 60.9(6,21)*** | 53.1(3,84)*** | 2.1(9,84)* | |
| Nuptake | 113.5(1,21)*** | ns | 120.0(3,21)*** | 43.2(3,84)*** | 2.1(9,84)* | |
| NeffCC | ns | ns | ns | 43.2(3,84)*** | 2.0(9,84)* | |
| Weed cover in crop | ns | ns | 104.6(6,21)*** | ns | ns | |
| Cover crop biomass | 54.4(6,21)*** | ns | 3.5(6,21)* | 127.3(3,56)*** | ns | |
| Weed biomass in CC | 35.9(6,21)*** | ns | ns | 41.9(3,84)*** | ns |
(F(df1,df2) values and significance level; df1: numerator degrees of freedom; df2: denominator degrees of freedom; ns: non-significant; °p < 0.1; *p < 0.05; **p < 0.01; ***p < 0.001). NeffCC: N effect of cover crop (see equation (3)). Significant effects of the various factors and treatments are in bold.