Fig. 1. Total C and N (g kg^–1; normalized to sand-free basis) in water-stable aggregates (n = 4). A and C represent aggregate total C and N for no-tillage (NT) and conventional tillage (CT) averaged across manure (M) and fertilizer (F), lowercase letters indicate significant differences between aggregate-size fraction and tillage; P < 0.05; B and D represent aggregate total C and N for manure and fertilizer averaged across tillage, lowercase letters indicate significant differences between aggregate-size fraction and N source; P < 0.05.