Although more food is needed for the rapidlygrowing human population, food qualityalso needs to be improved, particularly forincreased nutrient content. In addition, agricul-tural inputs must be reduced, especially those ofnitrogenous fertilizers, if we are to reduce en-vironmental degradation caused by emissionsof CO2and nitrogenous compounds from agri-cultural processes. Furthermore, there are nowconcerns about our ability to increase or evensustain crop yield and quality in the face of dy-namic environmental and biotic threats that willbe particularly challenging in the face of rapidglobal environmental change. The current