65a67d99__Biopower_in_the_United_States__4
[0] Willow (example of a wood crop grown as a bush type or “coppice” crop in high density plantings as dedicated bioenergy crop) [1] 7,983-8,497 [2] 4-8 dry tons/acre/year harvested on 2-4 year cycle [3] High yield potential Grown for several cycles before replanting Select varieties easily replicated by cloning Easy to automate planting and harvest as a row crop Short harvest cycle for wood Farmers can grow and harvest Low ash content [5] Very high future yield potential with genetic selection Innovative harvest equipment is available Many woody hardwood crops can be grown as bush type crops Economic yields obtained on marginal to good cropland Less fertilization required than agricultural crops [4] 
Requires specialized harvesting equipment High density plantings are costly to establish U.S. experience and varieties of willow currently limited to Northeast Must be harvested in winter to obtain regrowth for several cycles Agricultural site preparation needed for successful establishment Susceptibility of some willow varieties to insects and diseases may require occasional chemical applications
Biomass Feedstocks for Biopower in the United States
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