Table 5 Comparisons between treatments for stand volume (m3 ha−1), recorded 2.5 years after treatment application in the Pinus radiata trial
Treatment comparisons | Difference in stand volume | P value | Result |
|---|---|---|---|
CTH-Oct vs CTH-Oct x2 (treatment 7 vs treatment 6) | −2.40 | 0.001 | Significantly lower volume where weed control was carried out in October of year 1 compared with control over both years. A 66% increase in volume where 2 years of control carried out. |
CTH-Dec vs CTH-Dec x2 (treatment 9 vs treatment 8) | −0.37 | 0.999 | No significant difference in volume when weed control is carried out in December. |
CTH-Dec x2 vs CTH-Oct x2 (treatment 8 vs treatment 6) | −2.33 | 0.003 | Significantly lower volume (64%) where weed control in year 1 and year 2 carried out in December rather than October. |
Spot control 2 vs spot control 1 (treatment 5 vs treatment 4) | 1.45 | 0.283 | This difference was not significant. However, volume in spot control 2 treatment was 42% greater than that in spot control 1, indicating benefit of second year control. |