Ammonia volatilization from surface-applied poultry litter under conservation tillage management practices |
| |
Authors: | Sharpe R R Schomberg H H Harper L A Endale D M Jenkins M B Franzluebbers A J |
| |
Institution: | Southern Piedmont Conservation Research Unit, USDA-ARS, 1420 Experiment Station Road, Watkinsville, GA 30677, USA. rsharpe@uga.edu |
| |
Abstract: | Land application of poultry litter can provide essential plant nutrients for crop production, but ammonia (NH(3)) volatilization from the litter can be detrimental to the environment. A multiseason study was conducted to quantify NH(3) volatilization rates from surface-applied poultry litter under no-till and paraplowed conservation tillage managements. Litter was applied to supply 90 to 140 kg N ha(-1). Evaluation of NH(3) volatilization was determined using gas concentrations and the flux-gradient gas transport technique using the momentum balance transport coefficient. Ammonia fluxes ranged from 3.3 to 24% of the total N applied during the winter and summer, respectively. Ammonia volatilization was rapid immediately after litter application and stopped within 7 to 8 d. Precipitation of 17 mm essentially halted volatilization, probably by transporting litter N into the soil matrix. Application of poultry to conservation-tilled cropland immediately before rainfall events would reduce N losses to the atmosphere but could also increase NO(3) leaching and runoff to streams and rivers. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|