| A low-disturbance rolling-tine manure slurry injector was evaluated for effects on soil infiltration, residue cover, slurry placement uniformity, and soil electrical conductivity. Initial water infiltration rates were found to be greater for more aggressively tilled plots. Aggressively tilled plots had a lower residue cover. Soil electrical conductivity (EC) and phosphorous (P) concentrations were measured in untilled, lightly tilled and aggressively tilled plots with manure applied at 49100 L ha-1 (5,250 gpa). P concentrations were analyzed with and without soil EC as a covariate. P concentrations in the 0--7.6 cm (0--3 in) layer were greatest at the points of greatest soil disturbance. Using Soil EC as a covariate in the analysis of soil P improved the accuracy of the analysis. Soil EC values were not affected by tillage at the 91 cm (3 ft) depth. Soil EC levels were increased by tillage at the 30 cm (1 ft) depth, with light and no tillage showing the largest increase. |
