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Table 3 Comparisons between treatments for weed cover (%) within a 1-m radius centred around each tree for the Pinus radiata 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 Result
CTH-Oct vs CTH-Oct x2 (treatment 6 vs treatment 7) 31.4 <0.001 Cover of weeds (%) significantly higher in plots where a broadcast treatment was applied only in spring after planting as opposed to spring of planting and following year
CTH-Dec vs CTH-Dec x2 (treatment 8 vs treatment 9) −12.6 0.99 No significant difference in weed cover regardless of frequency when release carried out in summer (December)
CTH-Dec x2 vs CTH-Oct x2 (treatment 8 vs treatment 6) 26.1 <0.001 Significantly higher cover of weeds at 18 months where release carried out in summer (December) of planting and following year versus spring (October) of both
Spot control 2 vs spot control 1 (treatment 5 vs treatment 4) −22.0 <0.001 Cover of weeds (%) significantly lower in spot control 2 where an additional release operation was carried out in the spring of the year after planting
Spot control 3 vs Operational (treatment 12 vs treatment 3) 22.8 <0.001 Significantly higher cover of weeds where terbuthylazine and hexazinone applied as a 1.4-m diameter spot in spring of planting as opposed to an aerial application of same active ingredients
  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