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Soil Aggregation, Aggregate Carbon and Nitrogen, and Moisture Retention Induced by Conservation Tillage

USDA-ARS, Integrated Farming and Natural Resources Research Unit, 2413 E. Hwy. 83, Weslaco, TX 78596

View larger version (26K): [in this window] [in a new window]   Fig. 1. Mass distribution of soil from two depths among aggregate size fractions after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Distribution of particle sizes in the <53-µm classification after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (33K): [in this window] [in a new window]   Fig. 3. Mean weight diameters of soil from two depths among aggregate size fractions after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Bars are ±1 SEM, n = 4.

View larger version (36K): [in this window] [in a new window]   Fig. 4. Mass-adjusted organic C content in aggregate size fractions of soil from two depths after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (25K): [in this window] [in a new window]   Fig. 5. Water holding capacity at three water potentials in the top 2.5 cm of soil after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Bars are ±1 SEM, n = 4.

View larger version (24K): [in this window] [in a new window]   Fig. 6. Organic C concentration in soil aggregate size fractions of soil from two depths after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (24K): [in this window] [in a new window]   Fig. 7. Organic N concentration in aggregate size fractions of soil from two depths after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (23K): [in this window] [in a new window]   Fig. 8. Mass-adjusted organic N content in aggregate size fractions of soil from two depths after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.

View larger version (30K): [in this window] [in a new window]   Fig. 9. Soil C/N ratio in aggregate size fractions of soil from two depths after 13 yr of conventional tillage (CT), no-tillage (NT), or ridge tillage (RT). Original soil sample size was 100 g. Bars are ±1 SEM, n = 4.