Tuesday, November 6, 2007
222-13

Comparison of pH and Salinity Analyses for Manure.

Janice Kotuby-Amacher1, Grant Cardon, and Tiffany Evans2. (1) Plants, Soils, and Climate, Utah State University, 2450 Le Conte Ave, Berkeley, CA 94709, (2) USU Analytical Labs, Utah State University, 4830 Old Main Hill, Logan, UT 84322-4830

The pH and salinity of manure samples have been determined by saturated paste at the USUAL in the past. To streamline the analysis, the lab considered changing to 1:1 or 2:1 water:solid ratio. Because no comparison of these methods could be found in the literature, the lab needed to compare the methods. At the same time, we wanted to compare various sources of manure and composts. Over 200 samples were submitted to the USUAL covering bovine (dairy cow, calf, and feeder cattle), equine, ovine (sheep), caprine (goat), swine, and poultry sources in Utah. Correlation between saturated pH vs 1:1 and 2:1 pH was excellent, with slopes of 1.03 and 1.05, respectively, intercepts of -0.19, and r-squared values of 0.96 and 0.94, respectively. Correlation between ECe and 1:1 EC (direct probe) and 2:1 EC (direct probe) were also very good, with slopes of 0.39 and 0.32, respectively, intercepts of 0.74 and 0.18, respectively, and with r-squared values of 0.85 and 0.86, respectively. The various manure sources were also analyzed for total nitrogen and total elemental composition. These results showed the variability within and between the sources analyzed.

Back to Utilization of Nutrients from Manure and Biosolids (includes Graduate Student Competition)
Back to S08 Nutrient Management & Soil & Plant Analysis

Back to The ASA-CSSA-SSSA International Annual Meetings (November 4-8, 2007)