1a.Objectives (from AD-416):
Evaluate the potential use of SPD material as a soil amendment for pasture/forage systems in Wisconsin.
1b.Approach (from AD-416):
A field study will be conducted over a two year period on Wisconsin farms to collect a data set of the changes in soil properties, water quality and plant growth and quality following agronomic additions of SPD material produced from the Dairyland Electric Cooperative Geneva, WI plant. A field site representing locally normal conditions will be chosen for application of four rates from 0-2 MT/ha surface applied SPD. Four replications of each plots will be treated. Soil before and one year following application will be sampled and characterized for nutrient status using standard soil testing techniques in the STAR lab at Wooster, OH. Lysimeters will be installed in the high and low treatments at 60 cm and shallow ground water samples collected and analyzed for trace elements in the same lab. Plant yield will be measured and samples taken during the growing season from each plot for measurement of major nutrient and trace metal contents. Data will be statistically analyzed using standard ANOVA.
Plots in a continuous alfalfa field (planted in 2009) were established in fall 2011 by cooperator at the University of Wisconsin – Platteville. Soil samples were collected from the plots and sent to Ohio State University for analysis. Flue Gas Desulfurization (FGD) gypsum from a power plant in Wisconsin was obtained and applied at rates of 100, 1000, and 10000 lbs/acre, and commercial gypsum fertilizer was applied to other plots as similar rates once in the fall of 2011. A control with no soil amendments was the final treatment. Plots were laid out in a randomized complete block design with the 7 treatments and 4 replications, for a total of 28 plots.
Plant tissue has been collected at alfalfa harvests in 2012 and 2013, and sent to the Ohio State University for analysis. Harvest yields have also been measured. No treatment effects from the gypsum were observed in 2012, most likely due to the serious drought conditions in Wisconsin. Field conditions in 2013 have been much improved for crop growth with more than sufficient rainfall. Yield and plant chemical analysis results from the two years will be evaluated and summarized in late 2013.