Perennial Bioenergy Crop Yield and Quality Response to Nitrogen Fertilization
BioEnergy Research(2019)
摘要
At two sites in the North Central USA (Michigan (KBS) and Wisconsin (ARL)), we evaluated the effect of N fertilization on the yield and quality of five perennial bioenergy feedstock cropping systems: (1) switchgrass ( Panicum virgatum L.), (2) giant miscanthus ( Miscanthus × giganteus ), (3) a native grass mixture (5 species), (4) an early successional field (volunteer herbaceous species), and (5) a restored prairie (18 species). In a randomized complete block design with 5 replicates and 2 split plots, N was applied at 0 and 56 kg ha −1 to split plots for each cropping system from 2010 to 2016. No yield response to N was detected in switchgrass at either location in any year. Giant miscanthus exhibited a positive yield response to N at both sites (11% at KBS and 83% at ARL). Nitrogen fertilizer addition significantly reduced glucose (KBS 12.9 and 13.8 g kg −1 year −1 , ARL 11.2 and 9.7 g kg −1 year −1 ) in the native grass mix and restored prairie systems respectively. Nitrogen fertilizer also reduced xylose at KBS in the switchgrasss, native grass mix, and restored prairie (4.9, 7.5, and 5.0 g kg −1 year −1 ). At ARL, N fertilization reduced xylose levels in switchgrass, giant miscanthus, and restored prairie (7.4, 6.8, and 6.2 g kg −1 year −1 ) and increased xylose levels in the early successional system (5.0 g kg −1 year −1 ).
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关键词
Biomass yield,Glucose content,Xylose content,Ethanol yield,Perennial grasses
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