Each year the KBS LTER program awards two graduate students with summer research fellowships. Here Brendan O'Neill describes the research his summer fellowship supported. Brendan is a Ph.D. student in Tom Schmidt and Phil Robertson's labs. ~~~ My research at the Kellogg Biological Station Long-term Ecological Research (KBS LTER) site has focused on how increasing crop diversity (for example, including cover crops) can enhance soil ecosystem functions while sustaining crop production. Examples of soil ecosystem functions include retaining carbon (C) and nitrogen (N) within the field and