Mean volumes in broad log grade groupings for each biosolids treatment.

<p>Mean volumes in broad log grade groupings for each biosolids treatment.</p

Effect of biosolids application on site productivity.

<p>Increase in 300 Index of trees treated with standard and high rates of biosolids versus untreated trees. The bars represent the least significant difference (LSD) values calculated for each age. Differences between the standard and high treatments, and between either of these and the control (zero line), which are greater than the LSD, are statistically significant (p  =  0.05). The arrows show when biosolids treatments were applied.</p

Productivity indices based on age 18 year measurement, and mean acoustic velocity in standing trees assessed at age 15 years, and resonance velocity assessed in felled trees by log height class at age 15 years, for each biosolids treatment.

<p>Values in a column followed by the same letter do not differ significantly (least significant difference test, p = 0.05).</p

Predicted mean acoustic velocity and percentage of logs in acoustic velocity classes for each treatment.

<p>Predicted mean acoustic velocity and percentage of logs in acoustic velocity classes for each treatment.</p

Effect of biosolids application on growth.

<p>Measurement of tree (A) diameter at breast height (DBH), and (B) stem volume since the initial biosolids application at age 6 years. The bars represent the least significant difference (LSD) values calculated for each age. Treatment differences greater than the LSD are statistically significant (p  =  0.05). The arrows show when biosolids treatments were applied.</p

Predicted economic returns over a rotation for each treatment.

a<p>NPV: net present value.</p>b<p>IRR: internal rate of return.</p

Predicted mean value ($ m^-3) of pruned, unpruned, and all logs, and net mean value of all logs after accounting for harvesting costs in each biosolids treatment.

<p>Predicted mean value ($ m^-3) of pruned, unpruned, and all logs, and net mean value of all logs after accounting for harvesting costs in each biosolids treatment.</p

Predicted stumpage value ($ ha^-1) by log grade and across all grades for each biosolids treatment.

<p>Predicted stumpage value ($ ha^-1) by log grade and across all grades for each biosolids treatment.</p