300-10 Influence of Gypsum and Carbon Amendments on Carbon Fractionation in Two Contrasting Soils in Ohio.

Poster Number 417

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Improving Accuracy and Precision of Soil Carbon and Greenhouse Gas Emission Measurements and Quantification: II (includes student competition)

Tuesday, November 17, 2015
Minneapolis Convention Center, Exhibit Hall BC

Maninder K. Walia, University of Minnesota, Morris, MN and Warren A Dick, 1680 Madison Ave., Ohio State University, Wooster, OH
Abstract:
Gypsum (a byproduct from the combustion of coal for electrical energy production) and crop residues can improve soil properties, but few studies have focused on their effect to impact various C pools in soil. A greenhouse experiment was conducted to measure the different forms of C (i.e. total C by dry combustion, permanganate oxidizable C (POXC) and inorganic C by Chittick’s apparatus)  in 5 soil layers (0-2, 2-4, 4-10, 10-25 and 25-40 cm) as influenced by glucose as a readily available C source (0 and 5.0 Mg ha-1), crop residues (0 and 13.4 Mg ha-1) and gypsum (0 and 26.9 Mg ha-1) additions to a Wooster silt loam and a Hoytville clay loam. Glucose and residue increased total C significantly (P < 0.10) to a depth of 4 and 25 cm, respectively. Gypsum addition did not affected total C concentrations. Also, no significant effects of treatments on POXC concentrations were observed. Glucose addition resulted in significant increase in calcite level in only the 0-2 cm soil layer. Residue and gypsum addition did not increase inorganic C significantly, except in one soil layer 25-40 cm, where gypsum was also included. This was attributed to the abundant supply of Ca2+ leading to formation of inorganic carbonates, a form of soil C sequestration. Addition of C and gypsum to soil can increase C levels in soil provided there is a sufficient increase in CO2 and Ca concentration within the soil profile. The sequestered C can improve soil quality and provide overall environmental benefits.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Improving Accuracy and Precision of Soil Carbon and Greenhouse Gas Emission Measurements and Quantification: II (includes student competition)

<< Previous Abstract | Next Abstract