Results
There is strong evidence of an effect of cover crop treatment on
penetration resistance. Treatment of mixture results in significant
higher resistance compared to fibrous or taproots.
## Anova Table (Type III tests)
##
## Response: druk
## Sum Sq Df F value Pr(>F)
## (Intercept) 85.277 1 529.1064 < 2.2e-16 ***
## treatment 2.050 2 6.3597 0.0019395 **
## jaar 285.794 1 1773.2155 < 2.2e-16 ***
## blok 3.000 3 6.2053 0.0004082 ***
## blok:baan 2.788 8 2.1625 0.0298369 *
## Residuals 55.605 345
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

## treatment emmean SE df lower.CL upper.CL
## Fibrous roots 2.48 0.0366 345 2.40 2.55
## Mixture 2.56 0.0366 345 2.49 2.63
## Taproots 2.38 0.0366 345 2.30 2.45
##
## Results are averaged over the levels of: jaar, baan, blok
## Confidence level used: 0.95
## contrast estimate SE df t.ratio p.value
## Fibrous roots - Mixture -0.0850 0.0518 345 -1.640 0.2303
## Fibrous roots - Taproots 0.0996 0.0518 345 1.923 0.1338
## Mixture - Taproots 0.1846 0.0518 345 3.563 0.0012
##
## Results are averaged over the levels of: jaar, baan, blok
## P value adjustment: tukey method for comparing a family of 3 estimates


