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Hybrid poplars have demonstrated high productivity as short rotation woody crops (SRWCs) in the U.S. Midwest, and the hybrid aspen ‘Crandon’ (Populus alba L. × P. grandidenta Michx.) has exhibited particularly promising yields across topographic positions (including sloping marginal lands) in Iowa. However, a key obstacle for landowner acceptance of SRWCs is the lack of economic returns early in the rotation. Planting annual crops between the tree rows (alleycropping) has the potential to address this issue, especially with the use of winter triticale which completes its growth cycle early in the summer and therefore is expected to have minimal competitive interaction with the establishing trees. In addition, well-placed fertilizer in low rates at planting has the potential to improve tree establishment and shorten the rotation, which is also economically desirable. To test the potential productivity of ‘Crandon’ in this alleycropping system under a variety of conditions, plots were established on five different topographic positions (floodplain, toe slope, back slope, shoulder slope, and summit) with four different rates (0, 10, 20 , and 40 g tree) of 20-10-5 NPK fertilizer tablets placed in the planting hole. Trees were then

Productivity and biometry of hybrid poplars with respect to establishment, regeneration, regional modeling, and utilization of bio-energy byproducts