The cause and effect of soil variability in the Ecuadorian Andes.

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Presentation transcript:

The cause and effect of soil variability in the Ecuadorian Andes

Study area

The potato-pasture system in Carchi Fertile volcanic ash soils Potato-pasture rotation Seasonality almost absent Market oriented production Intensive use of external inputs

Research question Provide accurate information about the economic and environmental consequences of agricultural systems and policies, considering the complex interactions between bio-physical processes and farm management decisions

The Tradeoff Analysis Model Field evaluation Crop/management decisions Management evaluationTradeoff analysis Scenario definition

Scale Number of observations Soil survey ,500 10,000 62, ,000

Causes of soil variability Parent material Topography Tillage erosion Land management Climate

Cause 1. Parent material

Results R2R2

Cause 2. Topography

Results R2R2

Cause 3. Tillage erosion

Tillage erosion = f(distance, topography) No tillage erosion Strong tillage erosion

Results R2R2

Cause 4. Land management

Results R2R2

Cause 5. Climate

Results R2R2

Detailed soil survey

Simulation Inherent productivity Carbofuran use Potato/dairy ratio Carbofuran leaching Tillage erosion

Effect 1

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Carbofuran leaching Low High

Effects 2 Causes of variation: 62 % soil variation 38 % price variation

Effects 3

Repercusions on soil variability

Conclusions

Current research activities - Kenya -

Current research activities - Senegal - CENTURY

Current research activities - USA - Consortium for agricultural soils mitigation of greenhouse gases

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