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