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Table 8 Comparisons between treatments for weed cover (%) within a 1 m radius centred around each tree in the Pseudotsuga menziesii trial

From: Herbicide options for managing competitive vegetation during the establishment of Pinus radiata and Pseudotsuga menziesii var. menziesii in Southland, New Zealand

Treatment comparisons Difference in cover (%) P value Comment
Spot control 2 vs spot control 1 (treatment 5 vs treatment 4) −26 <0.001 Cover significantly lower in spot control 2 where a second year control operation was carried out
CTH-Oct vs CTH-Oct x2 (treatment 7 vs treatment 6) 48.7 <0.001 Cover significantly higher in plots where a broadcast treatment was applied only in October of year 1 as opposed to year 1 and year 2
CTH-Dec x2 vs CTH-Oct x2 (treatment 8 vs treatment 6) 38.2 <0.001 Cover significantly higher where control was carried out in December rather than October indicating the benefit of early weed control
  1. The difference in cover (%) between the treatments, using the second treatment as the base, the significance of the comparison and its meaning are described in the table