Daniel Moebius-Clune, Bianca Moebius-Clune, Robert Schindelbeck, Janice Thies, and Harold van Es. Soilhealth.cals.cornell.edu
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1 Cornell Soil Health Update Daniel Moebius-Clune, Bianca Moebius-Clune, Robert Schindelbeck, Janice Thies, and Harold van Es Soilhealth.cals.cornell.edu
2 Now a National Focus: Today s soils are limited by their HEALTH Beyond nutrient limitations and excesses Biological and physical limitations: Limit resilience to drought and extreme rainfall, Pests Impact crop quality, yield Demand expensive inputs Need to understand agroecosystems as systems with many interconnected parts Need to identify and understand constraints and manage them explicitly
3 Soil Health Initiatives The Soil Renaissance will focus on four initiatives: Measurement: To incorporate soil-health measures into standardized soil testing that is readily available, affordable, and commercial viable. Economics: To quantify the effects of soil health on economic risks and returns. Education: To reawaken the public to the importance of soil health. Research: To convene the research community to advance soil health. Farmfoundation.org
4 Soilhealthpartnership.org Our ultimate goals are to MEASURE AND COMMUNICATE THE ECONOMIC AND ENVIRONMENTAL BENEFITS of different soil management strategies and provide a set of regionally specific, data-driven recommendations that farmers can use to improve the productivity and sustainability of their farms.
5 USDA Strategic Plan
6 Processes in Healthy Soil must function optimally: Role of Soil Testing Past Focus of Soil Testing Physical Soil Health Chemical Soil Testing must address these! Biological Cornell Soil Health Team soilhealth.cals.cornell.edu
7 Both Buxton Silt Loam Conventional soil testing indicates this soil superior Dorn Cox, 2012 Bianca Moebius-Clune, 2012
8 Cornell Soil Health Assessment Publically available since 2006, revised 2014 with new indicators Identifies soil constraints Measures 16 indicators o Representing agronomically important bio/phys soil processes o Includes standard nutrient test Guide for management decisions o Measures interpreted with scoring functions o Report now includes explicit written interpretations and management suggestions table Cornell Soil Health Team soilhealth.cals.cornell.edu
9 Cornell Soil Health Assessment
10 Process Constraints Identified Through Indicators Physical Indicators Available Water Capacity Surface Hardness Subsurface Hardness Aggregate Stability Biological Indicators Organic Matter ACE Soil Protein Index New in 2014 Root Pathogen Pressure Respiration New in 2014 Active Carbon Soil Processes Water that plant can use; drought resistance, prevent leaching Penetration resistance 0-6 ; aeration, surface rooting, infiltration, germination, prevent runoff & erosion Penetration resistance 6-18 ; deep rooting, drought resistance, water movement and drainage, extreme precipitation resilience Resistance to falling apart during rainfall; aeration, infiltration, germination, prevent crusting, runoff & erosion Soil Processes Water and nutrient storage/release, long-term energy storage, C sequestration N containing fraction of organic matter, indicator of organic matter quality and thus N release potential Disease presence and disease suppressiveness of microbial community Soil microbial activity and abundance, decomposition and nutrient transformation and release potential Carbon easily available as short-term microbial food source Chemical Indicators: Standard Soil Test Analysis included Cornell Soil Health Team soilhealth.cals.cornell.edu
11 Cornell Soil Health Assessment Organic Matter Content Exchange capacity Nutrient storage Aggregation Water holding capacity Protein Content Organic N pool Plant residues, root turnover, microbial biomass N Respiration Biological activity Active Carbon Labile carbon pool Pathogen Pressure
12 OM Composition of Residues Composed of: Cellulose Chitin Proteins Carbohydrates Lipids Nucleic Acids Salts Of these, Proteins are highest in organically bound N Microbial activity can mineralize this N, making it plant available
13 ACE Soil Protein Index Soil Protein Measurement 3g soil shaken with 24ml extractant 20 mm sodium citrate buffer, ph 7.0 Autoclaved C, 15 p.s.i Total protein in extract quantified using BCA assay
14 Why Measure Respiration? Respiration is a measure of the metabolic activity of the soil microbial community Microbial activity important functionally Cycling of nutrients into and out of soil OM pools Solubilization and transport Most N transformations Breakdown of incorporated residues Soil biological activity influences key physical characteristics OM accumulation Aggregate formation and stabilization
15 Soil Microbial Activity: Respiration Sealed Chamber Alkali Trap Respirometry 20g air dried soil Rewet by capillary action 9ml 0.5M KOH -- traps released CO 2 as CO 3 2- Trapped CO 3 2- quantified by conductivity drop in KOH
16 SH Management Planning Process Overview 1. Determine farm background and management history Compile background info: history by management unit, farm operation type, equipment, access to resources, situational opportunities or limitations. 2. Set goals and sample for soil health Determine number and distribution of soil health samples needed according to operation background and goals. 3. For each management unit: identify and explain constraints, prioritize Soil Health Report identifies constraints, guides prioritization. Explain results based on background, and adjust priorities. 4. Identify feasible management options Management suggestions table available as part of Soil Health Report, or online with NRCS practice linkages 5. Create short and long term Soil Health Management Plan Integrate agronomic science of 2-4 with grower realities of 1 to create a specific short-term schedule of management practices for each management unit and an overall long-term strategy 6. Implement, monitor, and adapt Implement and document management practices. Monitor progress, repeat testing, and evaluate outcomes. Adapt plan based on experience and data over time.
17 Soil Health Management Reporting Report with results Background on processes and indicators Explanation of results Suggested management practices
18 Indicator Scoring and Management Prioritization in the 2014 Report Format
19 Constrained and Suboptimal indicators are flagged in report management table
20 How does the Cornell Assessment Compare with the Haney Test? Potential soil health assessment complementarities Cornell Soil Health Assessment Physical constraints identified Biological constraints identified Bio/phys status not used to inform nutrient recs (Adapt-N does this for nitrogen) Various management guidelines to address constraints identified in phys/bio/chem functioning and connection to NRCS practices Haney Soil Health Nutrient Tool No physical constraints Different, some overlapping biological constraints identified (similar respiration assay, different active C fraction) Bio processes inform nutrient recs for NPK Cover crop management recs (% legume/%grass to use) for biological functioning
21 Linking Soil Health Info with Adapt-N, a cloud-based N recommendation tool
22 What factors does Adapt-N include in making a recommendation? Weather: High resolution (4x4 km) daily P &T, and SR data Irrigation amounts and dates Soil: texture/soil type, slope, rooting depth, % organic matter Tillage: fall or spring plowing; conservation tillage/residue management Fertilizer and manure applications: date, rate, type, N analysis, placement Crop: Cultivar; planting date, maturity class, Population and expected yield Rotations: soy, corn - silage or grain, or sod - last 3 yrs, % legume, surface killed or incorporated Economics: Fertilizer and grain prices & profit loss risk
23 Organic matter quantity and quality
24 Adapt-N Currently and Future Soil Organic Matter Environmental Conditions Estimated Mineral Nitrogen Soil Organic Matter Environmental Conditions Microbial Respiration Rate, Soil Protein Content, Active C, NIRS, etc. Estimated Mineral Nitrogen
25
26 Acknowledgements The Core Development Team at Cornell University: George Abawi, Beth Gugino (now Penn State), John Idowu (now NMSU), Bianca Moebius-Clune (headed to NRCS), Dan Moebius-Clune, Bob Schindelbeck, Janice Thies, Harold van Es, David Wolfe, Many Growers and Extension Educators Collaborators: Dorn Cox (Greenstart NH), Brandon Smith (NH-NRCS), Heather Darby (UVM), Ray Weil (UMD), Thomas Bjorkman (Cornell), NRCS, Conservation Districts, Greenstart NH, and a growing network of other people and organizations Funders:
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