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Potential for Enhanced Nutrient Cycling through Coupling of Agricultural and Bioenergy Systems

^a Dep. of Agricultural and Biosystems Engineering, Iowa State Univ., 3202 NSRIC Building, Ames, IA 50011
^b Thayer School of Engineering, Dartmouth College, Hanover, NH
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (13K): [in this window] [in a new window]   Figure 1. The introduction of new, high-quality fodder crops and the intensification of integrated crop–livestock production systems made possible a near tripling of English cereal yields between 1600 and 1900. Growth in agricultural output during this "English Agricultural Revolution" occurred largely without external nutrient inputs, instead relying on an efficient system of internal nutrient recycling between feedstock crops and livestock (adapted from Grigg, 1989).

View larger version (32K): [in this window] [in a new window]   Figure 2. Integrated biological and thermochemical processing of biomass with nutrient recovery.