CAFE Framework
Understanding Nutrient Flows Across Coupled Systems
The CAFE Framework (Cropping–Animal-crop–Food–Ecosystem) is a hierarchical nutrient accounting framework designed to quantify nitrogen and phosphorus flows across interconnected agricultural and environmental systems.
The framework was developed to address a major limitation in traditional nutrient management approaches: the tendency to focus only on croplands while overlooking the broader food, urban, and ecosystem systems that strongly influence nutrient redistribution and environmental outcomes.
CAFE consists of four nested systems:
1. Cropping system
2. Animal-crop system
3. Food system
4. Landscape ecosystem
Together, these systems provide a more complete understanding of nutrient dynamics and opportunities for sustainability transitions.
Components of the CAFE system
Each level of the CAFE framework introduces new inputs, outputs, stakeholders, and nutrient pathways, highlighting the increasing complexity of nutrient management across agricultural and environmental systems.
1. Cropping system
- Management boundary: Cropland.
- Primary inputs: fertilizer, atmospheric deposition to cropland, biological nitrogen fixation, and manure.
- Primary productive outputs: feed crops and non-feed crop products.
- Dominant nutrient dynamic added at this level: crop nitrogen uptake from soil.
- Typical stakeholders: farmers, fertilizer and seed industries, research and extension communities, and government agencies.
- Strategic focus: best management practices that raise nutrient use efficiency and reduce surplus.
2. Animal-crop system
- Management boundary: Cropland, pasture, and livestock.
- Primary inputs: all cropping-system inputs plus pasture inputs and imported feed.
- Primary productive outputs: non-feed crop products and animal products.
- Dominant nutrient dynamic added at this level: feed production, feed transfer, manure recycling, and livestock nutrient conversion.
- Typical stakeholders: farmers, agricultural industries, researchers, and government.
- Strategic focus: reintegration of crop and livestock systems, improved manure recycling, improved feed efficiency, and more balanced production portfolios.
3. Food system
- Management boundary: food, fiber, and crop-based biofuel supply chain.
- Primary inputs: all inputs to the Animal-crop system plus imported food, fiber, and crop-based biofuel.
- Primary productive outputs: food, fiber, and biofuel for domestic consumption and export.
- Dominant nutrient dynamic added at this level: transformation and loss from production to consumption.
- Typical stakeholders: farmers, agricultural industries, processors, retailers, researchers, and government.
- Strategic focus: improved storage, transport, processing efficiency, reduced food waste, and better alignment between production and consumption.
4. Landscape Ecosystem
- Management boundary: food-fiber-biofuel supply chain plus industry, human waste, and natural habitat.
- Primary inputs: all food-system inputs plus whole-landscape atmospheric deposition and other human-related nutrient additions within the defined region.
- Primary productive outputs: exported food, fiber, and crop-based biofuel products.
- Dominant nutrient dynamic added at this level: biogeochemical movement of nutrients from terrestrial systems to streams, estuaries, and the broader environment.
- Typical stakeholders: all above plus wastewater operators, energy and transportation sectors, and broader public agencies.
- Strategic focus: integration of agricultural productivity with ecosystem function, nutrient interception and treatment, sewage treatment and recycling, and reduction of non-agricultural emissions
New Publication Highlight
Chesapeake Bay Nutrient Systems Analysis
The Chesapeake Bay application revealed that nutrient surpluses beyond croplands exceeded cropland surpluses in most counties, highlighting the importance of food systems, wastewater systems, and urban nutrient dynamics in watershed management.
The study integrated:
- ecosystem nutrient accumulation
- cropland nutrient budgets
- livestock-feed systems
- food demand
- wastewater nutrient flows
