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Changes in Soil Attributes Following Low Phosphorus Swine Slurry Application to No-Tillage Sorghum

USDA-ARS, Soil and Water Conservation Research Unit, Lincoln, NE 68583

View larger version (38K): [in a new window]   Fig. 1. Small (<0.5 mm), large (0.5–2 mm), and total particulate organic matter (POM) as a function of nutrient treatment and year for the 0- to 30-cm depth increment. Bars within a POM size and treatment group with different letters above them are different at P < 0.05.

View larger version (30K): [in a new window]   Fig. 2. Microbial biomass C and N as a function of nutrient treatment and year for the 0- to 30-cm depth. Bars within a group with different letters above them are different at P < 0.05.

View larger version (24K): [in a new window]   Fig. 3. Changes in the soil quality index as a function of nutrient treatment and year. Error bars represent ± standard error. Symbols below a group signify no differences (NS) or differences (*) at P < 0.05 among treatments within a year. Symbols to the right of a treatment series signify no difference (NS) or difference (*) at P < 0.05 among years for a treatment.