117-5
Soil Concentrations of Carbohydrates and Amino Compounds Following Poultry Manure Application.
Monday, October 22, 2012: 9:30 AM
Duke Energy Convention Center, Room 208, Level 2, 2
Daniel C. Olk, USDA-ARS National Laboratory for Agriculture and the Environment, Ames, IA, Heidi Waldrip, USDA-ARS Conservation and Production Research Lab, Bushland, TX and Zhongqi He, Southern Regional Research Center, USDA-ARS, New Orleans, LA
In a greenhouse pot study, ryegrass was grown on a Maine soil with poultry manure applied at the recommended rate (43 Mg manure ha-1) and also at 215 Mg manure ha-1. To determine some effects of the manure on the chemical nature of soil C, carbohydrates and amino compounds (amino acids and two amino sugars) were measured by anion chromatography / pulsed amperometry. The manure addition increased soil concentrations of seven carbohydrates and also 20 amino compounds in both the rhizosphere and in non-rhizosphere soil. Rhizosphere soil was enriched both in amino compounds and carbohydrates compared to non-rhizosphere soil. The enriched compounds in the rhizosphere appear to be more so of plant origin than of microbial origin, especially the aromatic amino acids phenylalanine and tyrosine.
