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Tillage and Manure Effects on Soil and Aggregate-Associated Carbon and Nitrogen

Dep. of Agronomy, Kansas State University, Manhattan, KS 66506

View larger version (35K): [in a new window]   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.

View larger version (33K): [in a new window]   Fig. 2. Labile C and N after 28 d of incubation (µg g–1; normalized to sand-free basis) in water-stable aggregates (n = 4). A and C represent aggregate labile C and N for no-tillage (NT) and conventional tillage (CT) and 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 labile 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.

View larger version (32K): [in a new window]   Fig. 3. Total C and N masses (g whole aggregate–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.

View larger version (33K): [in a new window]   Fig. 4. Labile C and N mass after 28 d of incubation (µg whole aggregate–1; normalized to sand-free basis) in water-stable aggregates (n = 4). A and C represent aggregate labile 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 labile 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.