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Fig. 1. Corn grain yield as a function of N rate of liquid swine manure (LM) and commercial fertilizer N (CF) under no-tillage (NT), strip tillage (ST), and chisel plow (CP) systems at Nashua, IA: (a) LM in 2002, (b) CF in 2002, (c) LM in 2003, (d) CF in 2003, (e) LM in 2004, and (f) CF in 2004. Error bars represent ±1 SE.
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