†Early series treatments denote weed presence at sugar beet emergence;
‡Late series treatments weed addition after sugar beet
emergence;
§ Weed presence from emergence to harvest (season-long
weed presence)
¶Season-long weed-free treatment
Table 2. Model selection p-values for sugar beet leaf and root
measurements from the field study. Null hypothesis is that removal of
the fixed effect term (weedy vs non, duration) does not reduce model
fit; significant P-values suggest the term should remain in the model.
P-values associated with final selected model terms are printed in bold.