Treatments
Main crop and green manure
Main |
Spring wheat |
Spring Barley |
Potato |
Mixture |
annual mixture |
Peronnial mixture (until end of 2021) |
- |
Fibrous roots |
sudan grass |
Tall fescue & english ryegrass (until end of
2021) |
- |
Taproots |
fodder radish |
Lucerne (until end of 2021) |
- |
Mechanical treatment
SS |
Subsoiling |
SB |
Small boreholes |
LB |
Large boreholes |
Ref |
Untreated |
The experimental design
The field is divided into four blocks. Every block is divided into
three subplots. Every treatment occurs once in each subplot. We make the
assumption that the treatments are divided randomly in each subplot. The
mechanical treatments are divided over the blocks. The mechanical
treatment will not be analysed, since we can not know if the variety
between the mechanical treatments is explained by the treatment or by
differences between the fields.

Moisture percentage depth 0-15
There are no significant effects between the different green manure
treatments on fresh weight in 2022.

## Analysis of Variance Table
##
## Response: bulkdensity2022[, var]
## Df Sum Sq Mean Sq F value Pr(>F)
## treatment 2 0.3758 0.18792 0.3593 0.70216
## blok 3 4.3605 1.45350 2.7794 0.06511 .
## blok:subplot 8 6.3367 0.79209 1.5146 0.20877
## Residuals 22 11.5050 0.52296
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## Shapiro-Wilk normality test
##
## data: model$residuals
## W = 0.97705, p-value = 0.6451
##
## $emmeans
## contrast estimate SE df t.ratio p.value
## Fibrous roots - Mixture 0.250 0.295 22 0.848 0.6780
## Fibrous roots - Taproots 0.124 0.295 22 0.422 0.9071
## Mixture - Taproots -0.126 0.295 22 -0.426 0.9052
##
## Results are averaged over the levels of: subplot, blok
## Note: contrasts are still on the [ scale
## P value adjustment: tukey method for comparing a family of 3 estimates
##
## $contrasts
## contrast estimate SE df
## (Fibrous roots - Mixture) - (Fibrous roots - Taproots) 0.126 0.295 22
## (Fibrous roots - Mixture) - (Mixture - Taproots) 0.376 0.511 22
## (Fibrous roots - Taproots) - (Mixture - Taproots) 0.250 0.295 22
## t.ratio p.value
## 0.426 0.9052
## 0.736 0.7453
## 0.848 0.6780
##
## Results are averaged over the levels of: subplot, blok
## P value adjustment: tukey method for comparing a family of 3 estimates

Moisture percentage depth 15-30
There are no significant effects between the different green manure
treatments on fresh weight in 2022.

## Analysis of Variance Table
##
## Response: bulkdensity2022[, var]
## Df Sum Sq Mean Sq F value Pr(>F)
## treatment 2 4.247 2.1237 0.6033 0.5558
## blok 3 1.667 0.5557 0.1579 0.9235
## blok:subplot 8 20.194 2.5243 0.7171 0.6746
## Residuals 22 77.447 3.5203
##
## Shapiro-Wilk normality test
##
## data: model$residuals
## W = 0.97904, p-value = 0.7131
##
## $emmeans
## contrast estimate SE df t.ratio p.value
## Fibrous roots - Mixture -0.240 0.766 22 -0.313 0.9476
## Fibrous roots - Taproots 0.579 0.766 22 0.755 0.7336
## Mixture - Taproots 0.818 0.766 22 1.068 0.5431
##
## Results are averaged over the levels of: subplot, blok
## Note: contrasts are still on the [ scale
## P value adjustment: tukey method for comparing a family of 3 estimates
##
## $contrasts
## contrast estimate SE df
## (Fibrous roots - Mixture) - (Fibrous roots - Taproots) -0.818 0.766 22
## (Fibrous roots - Mixture) - (Mixture - Taproots) -1.058 1.327 22
## (Fibrous roots - Taproots) - (Mixture - Taproots) -0.240 0.766 22
## t.ratio p.value
## -1.068 0.5431
## -0.797 0.7084
## -0.313 0.9476
##
## Results are averaged over the levels of: subplot, blok
## P value adjustment: tukey method for comparing a family of 3 estimates
