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New Zealand Journal of Forestry Science

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
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