Factors | Modalities | Marginal effect at mean point | P-value |
Under treatment (reference modality = light scarification) | Medium scarification | 0.2800 | 0.0000 |
Deep scarification | 0.4756 | 0.0000 | |
Substrate (reference condition = fine sand) | Sawdust | 0.0815 | 0.0372 |
Sawdust and fine sand | 0.1407 | 0.0003 | |
Sawdust and black soil | 0.0852 | 0.0293 | |
Black earth | −0.0037 | 0.9251 |