Results

The cover crop has an almost significant effect on moisture in both layers. This is mainly seen in the difference between black oats (low) and tall fescue(high), in the reference mechanical treatment. Block is a signifcant factor. Row as a factor does not improve the model.

5 - 10 cm

                
                 Fodder radish Black oats Tall fescue
  Ref                        3          3           3
  Compost                    0          0           0
  LB                         3          3           3
  LB extensive               0          0           0
  LB Sand                    0          0           0
  SB                         3          3           3
  SS                         3          3           3
  SS Caterpillar             0          0           0


    studentized Breusch-Pagan test

data:  md
BP = 20.646, df = 12, p-value = 0.05581

Call:
lm(formula = fractie_water ~ ondgr_bw * gr_bem + blok, data = dataset.5.10cm)

Coefficients:
                 (Intercept)                    ondgr_bwLB  
                    0.222500                     -0.026333  
                  ondgr_bwSB                    ondgr_bwSS  
                    0.002667                     -0.003667  
            gr_bemBlack oats             gr_bemTall fescue  
                   -0.061333                      0.009333  
                        blok   ondgr_bwLB:gr_bemBlack oats  
                   -0.017917                      0.074333  
 ondgr_bwSB:gr_bemBlack oats   ondgr_bwSS:gr_bemBlack oats  
                    0.060333                      0.028667  
ondgr_bwLB:gr_bemTall fescue  ondgr_bwSB:gr_bemTall fescue  
                    0.012667                     -0.030333  
ondgr_bwSS:gr_bemTall fescue  
                   -0.015333  
Analysis of Variance Table

Response: fractie_water
                Df    Sum Sq   Mean Sq F value   Pr(>F)   
ondgr_bw         3 0.0009294 0.0003098  0.5312 0.665401   
gr_bem           2 0.0035491 0.0017745  3.0427 0.067237 . 
blok             1 0.0077042 0.0077042 13.2099 0.001387 **
ondgr_bw:gr_bem  6 0.0086838 0.0014473  2.4816 0.053392 . 
Residuals       23 0.0134138 0.0005832                    
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1


    Shapiro-Wilk normality test

data:  resid(md)
W = 0.965, p-value = 0.3051
$emmeans
 ondgr_bw gr_bem        emmean     SE df lower.CL upper.CL
 Ref      Fodder radish  0.187 0.0139 23   0.1578    0.216
 LB       Fodder radish  0.160 0.0139 23   0.1315    0.189
 SB       Fodder radish  0.189 0.0139 23   0.1605    0.218
 SS       Fodder radish  0.183 0.0139 23   0.1542    0.212
 Ref      Black oats     0.125 0.0139 23   0.0965    0.154
 LB       Black oats     0.173 0.0139 23   0.1445    0.202
 SB       Black oats     0.188 0.0139 23   0.1595    0.217
 SS       Black oats     0.150 0.0139 23   0.1215    0.179
 Ref      Tall fescue    0.196 0.0139 23   0.1672    0.225
 LB       Tall fescue    0.182 0.0139 23   0.1535    0.211
 SB       Tall fescue    0.168 0.0139 23   0.1395    0.197
 SS       Tall fescue    0.177 0.0139 23   0.1482    0.206

Confidence level used: 0.95 

$contrasts
 contrast                              estimate     SE df t.ratio p.value
 Ref Fodder radish - LB Fodder radish  0.026333 0.0197 23   1.335  0.9649
 Ref Fodder radish - SB Fodder radish -0.002667 0.0197 23  -0.135  1.0000
 Ref Fodder radish - SS Fodder radish  0.003667 0.0197 23   0.186  1.0000
 Ref Fodder radish - Ref Black oats    0.061333 0.0197 23   3.110  0.1397
 Ref Fodder radish - LB Black oats     0.013333 0.0197 23   0.676  0.9999
 Ref Fodder radish - SB Black oats    -0.001667 0.0197 23  -0.085  1.0000
 Ref Fodder radish - SS Black oats     0.036333 0.0197 23   1.843  0.7799
 Ref Fodder radish - Ref Tall fescue  -0.009333 0.0197 23  -0.473  1.0000
 Ref Fodder radish - LB Tall fescue    0.004333 0.0197 23   0.220  1.0000
 Ref Fodder radish - SB Tall fescue    0.018333 0.0197 23   0.930  0.9979
 Ref Fodder radish - SS Tall fescue    0.009667 0.0197 23   0.490  1.0000
 LB Fodder radish - SB Fodder radish  -0.029000 0.0197 23  -1.471  0.9343
 LB Fodder radish - SS Fodder radish  -0.022667 0.0197 23  -1.150  0.9881
 LB Fodder radish - Ref Black oats     0.035000 0.0197 23   1.775  0.8152
 LB Fodder radish - LB Black oats     -0.013000 0.0197 23  -0.659  0.9999
 LB Fodder radish - SB Black oats     -0.028000 0.0197 23  -1.420  0.9473
 LB Fodder radish - SS Black oats      0.010000 0.0197 23   0.507  1.0000
 LB Fodder radish - Ref Tall fescue   -0.035667 0.0197 23  -1.809  0.7979
 LB Fodder radish - LB Tall fescue    -0.022000 0.0197 23  -1.116  0.9906
 LB Fodder radish - SB Tall fescue    -0.008000 0.0197 23  -0.406  1.0000
 LB Fodder radish - SS Tall fescue    -0.016667 0.0197 23  -0.845  0.9991
 SB Fodder radish - SS Fodder radish   0.006333 0.0197 23   0.321  1.0000
 SB Fodder radish - Ref Black oats     0.064000 0.0197 23   3.246  0.1077
 SB Fodder radish - LB Black oats      0.016000 0.0197 23   0.811  0.9994
 SB Fodder radish - SB Black oats      0.001000 0.0197 23   0.051  1.0000
 SB Fodder radish - SS Black oats      0.039000 0.0197 23   1.978  0.7025
 SB Fodder radish - Ref Tall fescue   -0.006667 0.0197 23  -0.338  1.0000
 SB Fodder radish - LB Tall fescue     0.007000 0.0197 23   0.355  1.0000
 SB Fodder radish - SB Tall fescue     0.021000 0.0197 23   1.065  0.9935
 SB Fodder radish - SS Tall fescue     0.012333 0.0197 23   0.625  0.9999
 SS Fodder radish - Ref Black oats     0.057667 0.0197 23   2.925  0.1961
 SS Fodder radish - LB Black oats      0.009667 0.0197 23   0.490  1.0000
 SS Fodder radish - SB Black oats     -0.005333 0.0197 23  -0.270  1.0000
 SS Fodder radish - SS Black oats      0.032667 0.0197 23   1.657  0.8697
 SS Fodder radish - Ref Tall fescue   -0.013000 0.0197 23  -0.659  0.9999
 SS Fodder radish - LB Tall fescue     0.000667 0.0197 23   0.034  1.0000
 SS Fodder radish - SB Tall fescue     0.014667 0.0197 23   0.744  0.9997
 SS Fodder radish - SS Tall fescue     0.006000 0.0197 23   0.304  1.0000
 Ref Black oats - LB Black oats       -0.048000 0.0197 23  -2.434  0.4233
 Ref Black oats - SB Black oats       -0.063000 0.0197 23  -3.195  0.1189
 Ref Black oats - SS Black oats       -0.025000 0.0197 23  -1.268  0.9755
 Ref Black oats - Ref Tall fescue     -0.070667 0.0197 23  -3.584  0.0541
 Ref Black oats - LB Tall fescue      -0.057000 0.0197 23  -2.891  0.2080
 Ref Black oats - SB Tall fescue      -0.043000 0.0197 23  -2.181  0.5771
 Ref Black oats - SS Tall fescue      -0.051667 0.0197 23  -2.620  0.3239
 LB Black oats - SB Black oats        -0.015000 0.0197 23  -0.761  0.9997
 LB Black oats - SS Black oats         0.023000 0.0197 23   1.166  0.9868
 LB Black oats - Ref Tall fescue      -0.022667 0.0197 23  -1.150  0.9881
 LB Black oats - LB Tall fescue       -0.009000 0.0197 23  -0.456  1.0000
 LB Black oats - SB Tall fescue        0.005000 0.0197 23   0.254  1.0000
 LB Black oats - SS Tall fescue       -0.003667 0.0197 23  -0.186  1.0000
 SB Black oats - SS Black oats         0.038000 0.0197 23   1.927  0.7324
 SB Black oats - Ref Tall fescue      -0.007667 0.0197 23  -0.389  1.0000
 SB Black oats - LB Tall fescue        0.006000 0.0197 23   0.304  1.0000
 SB Black oats - SB Tall fescue        0.020000 0.0197 23   1.014  0.9956
 SB Black oats - SS Tall fescue        0.011333 0.0197 23   0.575  1.0000
 SS Black oats - Ref Tall fescue      -0.045667 0.0197 23  -2.316  0.4933
 SS Black oats - LB Tall fescue       -0.032000 0.0197 23  -1.623  0.8834
 SS Black oats - SB Tall fescue       -0.018000 0.0197 23  -0.913  0.9982
 SS Black oats - SS Tall fescue       -0.026667 0.0197 23  -1.352  0.9618
 Ref Tall fescue - LB Tall fescue      0.013667 0.0197 23   0.693  0.9999
 Ref Tall fescue - SB Tall fescue      0.027667 0.0197 23   1.403  0.9512
 Ref Tall fescue - SS Tall fescue      0.019000 0.0197 23   0.964  0.9972
 LB Tall fescue - SB Tall fescue       0.014000 0.0197 23   0.710  0.9998
 LB Tall fescue - SS Tall fescue       0.005333 0.0197 23   0.270  1.0000
 SB Tall fescue - SS Tall fescue      -0.008667 0.0197 23  -0.440  1.0000

P value adjustment: tukey method for comparing a family of 12 estimates 

20-25 cm

                
                 Fodder radish Black oats Tall fescue
  Ref                        3          3           3
  Compost                    0          0           0
  LB                         3          3           3
  LB extensive               0          0           0
  LB Sand                    0          0           0
  SB                         3          3           3
  SS                         3          3           3
  SS Caterpillar             0          0           0


Call:
lm(formula = fractie_water ~ ondgr_bw * gr_bem + blok, data = dataset.20.25cm)

Coefficients:
                 (Intercept)                    ondgr_bwLB  
                    0.246917                     -0.008000  
                  ondgr_bwSB                    ondgr_bwSS  
                   -0.009333                      0.027333  
            gr_bemBlack oats             gr_bemTall fescue  
                   -0.041667                      0.033000  
                        blok   ondgr_bwLB:gr_bemBlack oats  
                   -0.031292                      0.053667  
 ondgr_bwSB:gr_bemBlack oats   ondgr_bwSS:gr_bemBlack oats  
                    0.029667                      0.009667  
ondgr_bwLB:gr_bemTall fescue  ondgr_bwSB:gr_bemTall fescue  
                   -0.036667                     -0.019333  
ondgr_bwSS:gr_bemTall fescue  
                   -0.041667  
Analysis of Variance Table

Response: fractie_water
                Df    Sum Sq   Mean Sq F value    Pr(>F)    
ondgr_bw         3 0.0027007 0.0009002  1.0475   0.39042    
gr_bem           2 0.0045674 0.0022837  2.6573   0.09157 .  
blok             1 0.0235000 0.0235000 27.3450 2.646e-05 ***
ondgr_bw:gr_bem  6 0.0068688 0.0011448  1.3321   0.28327    
Residuals       23 0.0197660 0.0008594                      
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1


    Shapiro-Wilk normality test

data:  resid(md)
W = 0.98706, p-value = 0.9418
$emmeans
 gr_bem        emmean      SE df lower.CL upper.CL
 Fodder radish  0.187 0.00846 23    0.169    0.204
 Black oats     0.168 0.00846 23    0.151    0.186
 Tall fescue    0.195 0.00846 23    0.178    0.213

Results are averaged over the levels of: ondgr_bw 
Confidence level used: 0.95 

$contrasts
 contrast                    estimate    SE df t.ratio p.value
 Fodder radish - Black oats   0.01842 0.012 23   1.539  0.2920
 Fodder radish - Tall fescue -0.00858 0.012 23  -0.717  0.7559
 Black oats - Tall fescue    -0.02700 0.012 23  -2.256  0.0828

Results are averaged over the levels of: ondgr_bw 
P value adjustment: tukey method for comparing a family of 3 estimates 
$emmeans
 ondgr_bw gr_bem        emmean     SE df lower.CL upper.CL
 Ref      Fodder radish  0.184 0.0169 23    0.149    0.219
 LB       Fodder radish  0.176 0.0169 23    0.141    0.211
 SB       Fodder radish  0.175 0.0169 23    0.140    0.210
 SS       Fodder radish  0.212 0.0169 23    0.177    0.247
 Ref      Black oats     0.143 0.0169 23    0.108    0.178
 LB       Black oats     0.188 0.0169 23    0.153    0.223
 SB       Black oats     0.163 0.0169 23    0.128    0.198
 SS       Black oats     0.180 0.0169 23    0.145    0.215
 Ref      Tall fescue    0.217 0.0169 23    0.182    0.252
 LB       Tall fescue    0.173 0.0169 23    0.138    0.208
 SB       Tall fescue    0.189 0.0169 23    0.154    0.224
 SS       Tall fescue    0.203 0.0169 23    0.168    0.238

Confidence level used: 0.95 

$contrasts
 contrast                              estimate     SE df t.ratio p.value
 Ref Fodder radish - LB Fodder radish  0.008000 0.0239 23   0.334  1.0000
 Ref Fodder radish - SB Fodder radish  0.009333 0.0239 23   0.390  1.0000
 Ref Fodder radish - SS Fodder radish -0.027333 0.0239 23  -1.142  0.9887
 Ref Fodder radish - Ref Black oats    0.041667 0.0239 23   1.741  0.8319
 Ref Fodder radish - LB Black oats    -0.004000 0.0239 23  -0.167  1.0000
 Ref Fodder radish - SB Black oats     0.021333 0.0239 23   0.891  0.9986
 Ref Fodder radish - SS Black oats     0.004667 0.0239 23   0.195  1.0000
 Ref Fodder radish - Ref Tall fescue  -0.033000 0.0239 23  -1.379  0.9565
 Ref Fodder radish - LB Tall fescue    0.011667 0.0239 23   0.487  1.0000
 Ref Fodder radish - SB Tall fescue   -0.004333 0.0239 23  -0.181  1.0000
 Ref Fodder radish - SS Tall fescue   -0.018667 0.0239 23  -0.780  0.9996
 LB Fodder radish - SB Fodder radish   0.001333 0.0239 23   0.056  1.0000
 LB Fodder radish - SS Fodder radish  -0.035333 0.0239 23  -1.476  0.9328
 LB Fodder radish - Ref Black oats     0.033667 0.0239 23   1.407  0.9505
 LB Fodder radish - LB Black oats     -0.012000 0.0239 23  -0.501  1.0000
 LB Fodder radish - SB Black oats      0.013333 0.0239 23   0.557  1.0000
 LB Fodder radish - SS Black oats     -0.003333 0.0239 23  -0.139  1.0000
 LB Fodder radish - Ref Tall fescue   -0.041000 0.0239 23  -1.713  0.8450
 LB Fodder radish - LB Tall fescue     0.003667 0.0239 23   0.153  1.0000
 LB Fodder radish - SB Tall fescue    -0.012333 0.0239 23  -0.515  1.0000
 LB Fodder radish - SS Tall fescue    -0.026667 0.0239 23  -1.114  0.9907
 SB Fodder radish - SS Fodder radish  -0.036667 0.0239 23  -1.532  0.9160
 SB Fodder radish - Ref Black oats     0.032333 0.0239 23   1.351  0.9621
 SB Fodder radish - LB Black oats     -0.013333 0.0239 23  -0.557  1.0000
 SB Fodder radish - SB Black oats      0.012000 0.0239 23   0.501  1.0000
 SB Fodder radish - SS Black oats     -0.004667 0.0239 23  -0.195  1.0000
 SB Fodder radish - Ref Tall fescue   -0.042333 0.0239 23  -1.769  0.8183
 SB Fodder radish - LB Tall fescue     0.002333 0.0239 23   0.097  1.0000
 SB Fodder radish - SB Tall fescue    -0.013667 0.0239 23  -0.571  1.0000
 SB Fodder radish - SS Tall fescue    -0.028000 0.0239 23  -1.170  0.9865
 SS Fodder radish - Ref Black oats     0.069000 0.0239 23   2.883  0.2110
 SS Fodder radish - LB Black oats      0.023333 0.0239 23   0.975  0.9969
 SS Fodder radish - SB Black oats      0.048667 0.0239 23   2.033  0.6690
 SS Fodder radish - SS Black oats      0.032000 0.0239 23   1.337  0.9646
 SS Fodder radish - Ref Tall fescue   -0.005667 0.0239 23  -0.237  1.0000
 SS Fodder radish - LB Tall fescue     0.039000 0.0239 23   1.629  0.8809
 SS Fodder radish - SB Tall fescue     0.023000 0.0239 23   0.961  0.9972
 SS Fodder radish - SS Tall fescue     0.008667 0.0239 23   0.362  1.0000
 Ref Black oats - LB Black oats       -0.045667 0.0239 23  -1.908  0.7436
 Ref Black oats - SB Black oats       -0.020333 0.0239 23  -0.849  0.9991
 Ref Black oats - SS Black oats       -0.037000 0.0239 23  -1.546  0.9115
 Ref Black oats - Ref Tall fescue     -0.074667 0.0239 23  -3.119  0.1373
 Ref Black oats - LB Tall fescue      -0.030000 0.0239 23  -1.253  0.9775
 Ref Black oats - SB Tall fescue      -0.046000 0.0239 23  -1.922  0.7356
 Ref Black oats - SS Tall fescue      -0.060333 0.0239 23  -2.521  0.3753
 LB Black oats - SB Black oats         0.025333 0.0239 23   1.058  0.9938
 LB Black oats - SS Black oats         0.008667 0.0239 23   0.362  1.0000
 LB Black oats - Ref Tall fescue      -0.029000 0.0239 23  -1.212  0.9824
 LB Black oats - LB Tall fescue        0.015667 0.0239 23   0.655  0.9999
 LB Black oats - SB Tall fescue       -0.000333 0.0239 23  -0.014  1.0000
 LB Black oats - SS Tall fescue       -0.014667 0.0239 23  -0.613  1.0000
 SB Black oats - SS Black oats        -0.016667 0.0239 23  -0.696  0.9999
 SB Black oats - Ref Tall fescue      -0.054333 0.0239 23  -2.270  0.5215
 SB Black oats - LB Tall fescue       -0.009667 0.0239 23  -0.404  1.0000
 SB Black oats - SB Tall fescue       -0.025667 0.0239 23  -1.072  0.9931
 SB Black oats - SS Tall fescue       -0.040000 0.0239 23  -1.671  0.8636
 SS Black oats - Ref Tall fescue      -0.037667 0.0239 23  -1.574  0.9019
 SS Black oats - LB Tall fescue        0.007000 0.0239 23   0.292  1.0000
 SS Black oats - SB Tall fescue       -0.009000 0.0239 23  -0.376  1.0000
 SS Black oats - SS Tall fescue       -0.023333 0.0239 23  -0.975  0.9969
 Ref Tall fescue - LB Tall fescue      0.044667 0.0239 23   1.866  0.7671
 Ref Tall fescue - SB Tall fescue      0.028667 0.0239 23   1.198  0.9838
 Ref Tall fescue - SS Tall fescue      0.014333 0.0239 23   0.599  1.0000
 LB Tall fescue - SB Tall fescue      -0.016000 0.0239 23  -0.668  0.9999
 LB Tall fescue - SS Tall fescue      -0.030333 0.0239 23  -1.267  0.9756
 SB Tall fescue - SS Tall fescue      -0.014333 0.0239 23  -0.599  1.0000

P value adjustment: tukey method for comparing a family of 12 estimates 

Table

wortels_loof ondgr_bw gr_bem name
grond 20-25 cm Ref Fodder radish 0.1843333
grond 20-25 cm Ref Black oats 0.1426667
grond 20-25 cm Ref Tall fescue 0.2173333
grond 20-25 cm Ref NA 0.1440000
grond 20-25 cm Compost NA 0.1070000
grond 20-25 cm LB Fodder radish 0.1763333
grond 20-25 cm LB Black oats 0.1883333
grond 20-25 cm LB Tall fescue 0.1726667
grond 20-25 cm LB extensive NA 0.1340000
grond 20-25 cm LB Sand NA 0.1615000
grond 20-25 cm SB Fodder radish 0.1750000
grond 20-25 cm SB Black oats 0.1630000
grond 20-25 cm SB Tall fescue 0.1886667
grond 20-25 cm SS Fodder radish 0.2116667
grond 20-25 cm SS Black oats 0.1796667
grond 20-25 cm SS Tall fescue 0.2030000
grond 20-25 cm SS Caterpillar NA 0.1430000
grond 5-10 cm Ref Fodder radish 0.1866667
grond 5-10 cm Ref Black oats 0.1253333
grond 5-10 cm Ref Tall fescue 0.1960000
grond 5-10 cm Ref NA 0.1625000
grond 5-10 cm Compost NA 0.1630000
grond 5-10 cm LB Fodder radish 0.1603333
grond 5-10 cm LB Black oats 0.1733333
grond 5-10 cm LB Tall fescue 0.1823333
grond 5-10 cm LB extensive NA 0.1515000
grond 5-10 cm LB Sand NA 0.1625000
grond 5-10 cm SB Fodder radish 0.1893333
grond 5-10 cm SB Black oats 0.1883333
grond 5-10 cm SB Tall fescue 0.1683333
grond 5-10 cm SS Fodder radish 0.1830000
grond 5-10 cm SS Black oats 0.1503333
grond 5-10 cm SS Tall fescue 0.1770000
grond 5-10 cm SS Caterpillar NA 0.1606667