About IFSM (Integrated Farm System Model)


IFSM (Integrated Farm System Model) is a simulation tool for evaluating and comparing economic and environmental effects of alternative management scenarios on representative farms.


Dr. C. Alan Rotz, USDA-ARS,

Contact information

Presenter: Dr. Tamie L. Veith, Agricultural Engineer,

USDA - Agricultural Research Service, Pasture Systems and Watershed Mgmt Research Unit, Building 3702 Curtin Road, University Park, PA 16802


IFSM requires as much detail as possible about the day-to-day management and processes of the farm, facilities, and equipment and understanding of the producer’s goals. However, numerous sample farms are provided within the model to provide a starting point.


Average annual soil balance, runoff, leaching, and emissions of N, P, K and volatile compounds. Crop and animal production measures and economics.


IFSM is used worldwide, typically by researchers familiar with farming practices in the region and with the model itself, to answer stakeholder, conservationist, and policy-maker questions at the community and broader levels. IFSM theory and requirements are well-documented in the program’s help file. (see “other”)

Scales of Relevance

Whole farm. No within-farm spatial definition.


IFSM is free and publically available. However, it is a working research model and the interface does not always prevent entry errors or inconsistencies. DairyGHG and DairyGEM are offshoots for emissions evaluations and are more geared to the farmer and extension personnel.


USDA-ARS, Pasture Systems and Watershed Management Research Unit, Support is also provided by USDA’s Cooperative Research, Education, and Extension Service

Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.