Development of a segregation method to sort fast-grown Eucalyptus nitens (H. Deane & Maiden) Maiden plantation trees and logs for higher quality structural timber products

Table 5 Volume (m³) of logs harvested and recovered as sawlogs or pulplogs under each scenario and volume (m³) and amount (%) of boards recovered divided in high and low grades

Scenario	Sawlogs		Pulplogs		Sawn boards	High grades (m³)^a		Low grades (m³)^b
	(m³)	(%)*	(m³)	(%)*	(m³)	(m³)^a	(%)**	(m³)^b	(%)**
A	0	0	18.5	100	0	0	0	0	0
B	18.5	100	0	0	8.05	3.41	42.4	4.64	57.6
C	7.54	40.8	10.9	59.2	3.21	1.13	35.2	2.08	64.8
D	3.21	17.4	15.3	82.6	1.42	1.16	81.4	0.26	18.6
E	14.1	76.5	4.33	23.5	5.28	2.65	50.2	2.63	49.8
F	5.66	30.7	12.8	69.3	2.53	1.75	69.4	0.77	30.6

Ranking of scenario from best (scenario D) to least optimal for recovery of high-quality structural boards (scenarios E and F)
^aHigh grades include Structural grade no. 1 and 2
^bLow grades include Structural grade no. 3 and 4 and under-grade boards
*(%) Percentages of logs are calculated as the volume of sawlogs/pulplogs over the total volume of harvested logs (18.5 m³)
**(%) Grades are calculated as the volume of boards in that category over the total volume of boards sawn in that scenario

ISSN: 1297-966X