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Termination of Sewage Biosolids Application Affects Wheat Yield and Other Agronomic Characteristics

Department of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80523-1170

View larger version (17K): [in a new window]   Fig. 1. Wheat grain yields compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Error bars indicate the standard error of the mean.

View larger version (18K): [in a new window]   Fig. 2. The AB-DTPA soil-extractable P concentrations in the 0- to 20-cm depth compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Where significant treatments x croppings interactions were found, averages labeled with the same lower case letter are not significantly different according to Least Significant Difference comparisons across all croppings at P 0.10.

View larger version (19K): [in a new window]   Fig. 3. The AB-DTPA soil-extractable Zn concentrations in the 0- to 20-cm depth compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Where significant treatments x croppings interactions were found, averages labeled with the same lower case letter are not significantly different according to Least Significant Difference comparisons across all croppings at P 0.10.

View larger version (19K): [in a new window]   Fig. 4. The AB-DTPA soil extractable Cu concentrations in the 0- to 20-cm depth compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Where significant treatments x croppings interactions were found, averages labeled with the same lower case letter are not significantly different according to Least Significant Difference comparisons across all croppings at P 0.10.

View larger version (16K): [in a new window]   Fig. 5. The soil NO3–N concentrations in the 0- to 20-cm depth compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Where significant treatments x cropping interactions were found, averages labeled with the same lower case letter are not significantly different according to Least Significant Difference comparisons across all croppings at P 0.10.

View larger version (17K): [in a new window]   Fig. 6. The ECe in the 0- to 20-cm depth compared with the number of croppings after termination of five excessive biosolids applications at West Bennett, 1990–1998. Where significant treatments x croppings interactions were found, averages labeled with the same lower case letter are not significantly different according to Least Significant Difference comparisons across all croppings at P 0.10.