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United States Department of Agriculture

Agricultural Research Service

Research Project: Development of emission factors from manure storage and enhancement of process based models to determine whole farm emissions

Location: Northwest Irrigation and Soils Research

2013 Annual Report

1a. Objectives (from AD-416):
The goal of the proposed research is to 1) Develop emission factors for NH3 and GHGs from the primary manure storage systems utilized on dairies; and 2) improve process based models for estimating whole farm emissions.

1b. Approach (from AD-416):
On farm emission measurements will be made at a total of six different wastewater storage ponds with measurements at each pond made over the course of one year (four ponds have already been monitored). Ambient weather, herd and feed data will also be collected over this time period. Lagoon samples will be collected and analyzed each month for total nitrogen, total solids, volatile solids, total ammonical nitrogen, pH, ORP, EC, and temperature. The data from the wastewater ponds will be compiled and relationships between manure characteristics, herd management, manure management and weather data will be determined in order to develop equations that will better predict emissions from wastewater storage throughout the year. In addition, in year two, emissions from composting of scraped lot manure and solid separated manures will be measured over the composting cycle and correlated with manure characteristics, weather and compost management. This data in addition to data collected in previous emissions studies (Bjorneberg et al., 2009, Leytem et al., 2011, Leytem et al., 2012) will be compiled into a database that will be used for improving/refining and evaluating the process-based models Integrated Farm System Model (IFSM) and Dairy Gas Emissions Model (DairyGEM).

3. Progress Report:
The agreement was established in support of Objective 1 of the in house project, the goal being to determine emission rates of gases from dairy operations. We finished analysis of four of the six dairy lagoons in May of 2013. The remaining two wastewater ponds were identified in May and equipment was set up on farm in June of 2013. Wastewater lagoon sampling is underway and will be done every 3 weeks until the lagoon freezes. Data are being collected and analyzed as it becomes available. ARS researchers at Kimberly, Idaho and University Park, Pennsylvania are cooperating to utilize project information to evaluate the Integrated Farm System Model for estimating dairy farm emissions.

4. Accomplishments

Last Modified: 06/24/2017
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