Impact of Soil Health on Crop Production Francisco J. Arriaga Soil Science Specialist Dept. of Soil Science & UW-Extension.

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Impact of Soil Health on Crop Production Francisco J. Arriaga Soil Science Specialist Dept. of Soil Science & UW-Extension

What is Soil Health? “the capacity of a specific kind of soil to function, within natural or managed ecosystem boundaries, to sustain plant and animal productivity, maintain or enhance water and air quality, and support human health and habitation.” (Karlen et al., 1997)

Functions of Soil source: Brady & Weil, 1996

Soil Functions Indicators Medium for plant growth Recycle/store nutrients & organic materials Habitat for soil organisms Water storage & purification Texture Structure Infiltration & bulk density Water holding capacity Aggregate stability Soil organic matter pH Extractable N,P, & K Microbial biomass C & N Potentially mineralizable N Soil respiration

Soil Properties Affected by SOM Physical – infiltration – water retention – hydraulic conductivity – bulk density Chemical – CEC – nutrient availability – buffering capacity source: soilquality.org A2809 Table 6.3

(Lado, Paz and Ben-Hur, 2004) Source: Magdoff and van Es, 2009

Nutrient Retention Source: Magdoff and van Es, 2009

How is Soil Organic Matter Lost? (Rochette and Angers, 1999)

Farming for Soil Organic Matter (adapted from National Academy of Sciences, 2009)

(Stine & Weil, 2002) Tillage: conventional reduced no-till Corn Yield

Why Does Soil Health Matters? Eroded field example: source: S. Papiernik, 2013

Why Does Soil Health Matters? source: S. Papiernik, 2013

Why Does Soil Health Matters? source: S. Papiernik, 2013

How Can the Health of a Soil be Improved? MeasurementProcess Affected Organic matter Nutrient cycling, pesticide and water retention, soil structure Infiltration Runoff and leaching potential, plant water use efficiency, erosion potential Aggregation Soil structure, erosion resistance, crop emergence, infiltration pH Nutrient availability, pesticide absorption and mobility Microbial biomass Biological activity, nutrient cycling, capacity to degrade pesticides Forms of N Availability to plants, leaching potential, mineralization and immobilization rates Bulk density Root penetration, water/air filled pores, biological activity Topsoil depth Rooting volume, water and nutrient availability Available nutrients Capacity to support plant growth, environmental hazard (adapted from Karlen et al. SSSAJ, 1997)

It is About Management! Source: Case Quick Start Guide Licht & Al-Kaisi, 2004

Final Thoughts Soil health is about managing SOM and aggregates… Old woodsKewaunee B horizonCorn silage-2 years Hay ( ); Corn (2013)