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July 30-330-CIG-Chris RebergHorton

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2019 SWCS International Annual Conference
July 28-31, 2019
Pittsburgh, Pennsylvania

Publicado en: Medio ambiente
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July 30-330-CIG-Chris RebergHorton

  1. 1. DECISION SUPPORT TOOLS FOR COVER CROPS: CREDITING WATER AND NITROGEN CONSERVATION CHRIS REBERG-HORTON, STEVEN MIRSKY, AND MANY, MANY MORE July 29, 2019 – Pittsburg, PA
  2. 2. 2 COVER CROPS Hairy Vetch Cereal Rye OatsRed Clover Winter Wheat Forage Radish Nitrogen Fixation Nutrient Scavenging/ Retention Insect Pests Erosion Control Nutrient Use Efficiency Conserve Water Crop Productivity Weed Suppression Organic Matter Habitat for Beneficial Organisms Cover Crops
  3. 3. ON-FARM NETWORK • On-farm trials • Cover crop adopters • 6 states • 2017-present • 75+ site-years 3
  4. 4. OBJECTIVES 4 Objectives: 1) to demonstrate the short-term benefits of cover crops on soil water and N conservation, and 2) to deploy decision support tools for growers to increase cover crop adoption in the mid-Atlantic and Southeast US. Many farmers believe cover crops are a net detriment to water storage and that grass cover crops increase N fertilizer requirements due to N immobilization. Low Cover Crop Adoption
  5. 5. Cover Crop TreatmentNo Cover Crop Treatment EXPERIMENTAL DESIGN 5 • 2 adjacent treatments. • Cover crop management is chosen by the grower. • Cover crop residues remain on the surface. • Next cash crop can be corn, cotton, or soybeans.
  6. 6. NITROGEN CONSERVATION 6 Annual nitrate mass loss in tile drainage for corn-soybean rotation near Ames, IA, with and without cover crop. Presence of the cover crop significantly reduced nitrate loss. Modeling effort is conducted to quantify the amount nitrogen released by the cover crop based on cover crop biomass composition, rainfall, temperature, and relative humidity.
  7. 7. WATER CREDIT 7 • Increased infiltration rates were observed in the cover crop treatments. • Differences between treatments was higher for more intense storms. • Further data analysis is ongoing.
  8. 8. GROWER DASHBOARD 8 For real-time data access and co-learning. Enter grower’s last name Grower’s sites Map site locations Sampled fresh cover crop biomass Dry cover crop biomass Cover crop biomass at grower’s sites in comparison to all the other sites Cover crop Nitrogen content and availability for cash crop Volumetric soil water content by depth and treatment
  9. 9. DECISION SUPPORT TOOLS 9
  10. 10. IMPACT OF THE PROJECT 10 Scientific Community  Better understanding of the short-term effects of cover crops on soil water dynamics and soil fertility. Field Educators  Development of an outreach program that identifies and overcomes misconceptions about the cost and value of cover crops. CC and CT Adopters  Growers have data to advocate with neighbors.  Development of advanced risk management tools to help growers improve their management strategies. Middle Adopters  We leverage our findings to increase CC and CT adoption across the US. General Public  Development a website to make our research program and findings accessible online.
  11. 11. FUTURE WORK 11 • On-farm network will be deployed to 23 states in 2020. • New metrics will be conducted to: - Evaluate the short-term effect of cover crops on weed and pest management. - Identify the social, economic, and intrinsic barriers to cover crop adoption • RGB and NIR cameras will be deployed to measure the effect of cover crops on cash crop water stress during the hot summer months.
  12. 12. FUTURE WORK 12
  13. 13. FUNDING SOURCES AND ACKNOWLEDGMENTS NRCS CONSERVATION INNOVATION GRANTS USDA – NIFA WATER FOR AGRICULTURE NRCS SOIL HEALTH DIVISION NRCS FIELD STAFF IN MULTIPLE STATES 13
  14. 14. Questions? 14

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