My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in JEQ

  1. Vol. 39 No. 4, p. 1236-1242
     
    Received: Aug 31, 2009
    Published: July, 2010


    * Corresponding author(s): christoph.steiner@biochar.org
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2009.0337

Reducing Nitrogen Loss during Poultry Litter Composting Using Biochar

  1. Christoph Steiner *,
  2. K.C. Das,
  3. Nathan Melear and
  4. Donald Lakly
  1. The Univ. of Georgia, Dep. of Biological and Agricultural Engineering, Driftmier Engineering Center, Athens, GA 30602

Abstract

Poultry litter (PL) is a potentially underused fertilizer because it contains appreciable amounts of N, P, K, and micronutrients. However, treatments like composting to reduce potential pathogens, weed seeds, and odor often result in high losses of N through NH3 volatilization. Biochar (BC) has been shown to act as an absorber of NH3 and water-soluble NH4 + and might therefore reduce losses of N during composting of manure. We produced three PL compost mixtures that consisted of PL without added BC (BC0), PL + 5% BC (BC5), and PL + 20% BC (BC20). The BC was produced from pine chips and used without further modifications. Three replicates of each treatment were placed in nine bioreactors to undergo composting for 42 d. The entire composting experiment was repeated three times in a complete-block design. Moisture content, temperature, pH, mass loss, gas (NH3, CO2, H2S) emissions, C, and nutrient contents were measured periodically throughout the experiments. Results showed no difference in PL mass loss with BC addition. Moisture content decreased, pH increased significantly, and peak CO2 and temperatures were significantly higher with BC20 compared with BC0. These results indicate a faster decomposition of PL if amended with BC. Ammonia concentrations in the emissions were lower by up to 64% if PL was mixed with BC (BC20), and total N losses were reduced by up to 52%. Biochar might be an ideal bulking agent for composting N-rich materials.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2010. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America