A spatially explicit approach to modeling biological productivity and economic attractiveness of short-rotation woody crops in the eastern USA

Table 6 Management practices and related costs for Populus hybrids short-rotation woody biomass crops in the northern USA and Populus deltoides in the southern USA (costs based on Dooley and Barlow [25])

Year	Activity	Northern cost, $US ha⁻¹	Southern cost, $US ha⁻¹
0	Herbicide/weed control	267	111
0	Site prep	74	173
0	Mechanical tillage	111	161
0	Planting^a	2501	571
1	Herbicide/weed control		111
1	Nitrogen fertilizer (67 kg ha⁻¹)		146
2	Nitrogen fertilizer (224 kg ha⁻¹)	484
2	Nitrogen fertilizer (134 kg ha⁻¹)		292
3	Nitrogen fertilizer (202 kg ha⁻¹)		435
4	Harvest^b	X
0	Stump removal (after harvest)	741
6	Nitrogen fertilizer (180 kg ha⁻¹)		435
8	Harvest^c		X
0	Stump removal (after harvest)		$300

^aPlanting hybrid poplar in the north is at 10,005 cuttings ha⁻¹; planting P. deltoides in the south is at 1730 cuttings ha⁻¹
^bHarvesting occurs at ages 4, 8, 12, 16, 20, and 24 for hybrid poplar in the north
^cHarvesting occurs at ages 8, 16, and 24 for P. deltoides in the south

ISSN: 2192-0567