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Jason Clark

Professional headshot

Title

Assistant Professor and SDSU Extension Soil Fertility Specialist

Office Building

Raven Precision Agriculture Center

Office

113

Mailing Address

Raven Precision Ag Building 113
Agronomy, Horticulture & Plant Science-Box 2100A
University Station
Brookings, SD 57007

Social Media Links

Education

  • Ph.D. in soil nutrient management | University of Minnesota-Twin Cities | 2018
  • M.S. in plant science | Utah State University | 2014
  • B.S. in agronomy | Utah State University | 2011

Academic Interests

  • Soil nutrient management
  • Crop nutrition

Academic Responsibilities

Early and Late In-season Nitrogen Applications
We are evaluating the influence of early and late in-season nitrogen applications on corn growth, nitrogen uptake and grain yield using Y-drop technology to place the nitrogen fertilizer near the corn plant.

Nitrogen Rate Influences Corn Health
In current research projects we are working on updating nitrogen fertilizer rate guidelines by evaluating corn's response to increasing nitrogen fertilizer rates throughout the state of South Dakota when nitrogen fertilizer is applied before planting and/or during the growing season.

Committees and Professional Memberships

  • Agronomy Society of America (ASA)
  • Soil Science Society of America (SSSA)
  • Crop Science Society of America (CSSA)

Extension Responsibilities

  • Soil fertility guidelines for South Dakota cropping systems

Areas of Research

My research and extension education program is focused on determining nutrient management methods that can maintain and increase crop production while conserving and reducing inputs (water, fertilizers, chemicals, etc.) in a way that minimizes environmental impact and is profitable for farmers.  

Specific research areas include:

  • Determining the optimal rate and timing of fertilizer application (i.e. N, P, K and S) for profitable crop production and optimal water quality.
  • Effect of source and placement of fertilizers (N, P and K) on crop production and air and water quality.
    Influence of cropping systems that promote soil health on adjustments needed for fertilizer rate, time, source and placement.
  • Development and use of precision agriculture technologies in crop production.

Publications

Department(s)

Related Links

ResearchGateGoogle ScholarSouth Dakota Fertilizer Recommendation GuideSDSU Extension Profile