To our valued Clients and Partners,


Valley Tech is taking the necessary steps to comply with Governor Newsom’s Executive Order N-33-20 and continue to provide our employees with a safe working environment during this COVID-19 crisis.  Agriculture has been deemed an essential industry by the Governor’s Order and as such we plan to continue normal operations both in the field and laboratory.  The safety of our employees and those who visit our facility will remain our utmost priority.  We have emphasized to our staff to be vigilant both at work and home, those who can work remotely are doing so and we are working with our in-house staff to keep contact to a minimum.  All employees are wearing and changing protective gloves while sanitizing and disinfecting all surfaces after contact with samples that are dropped off at our sample receiving location.

We have added additional tables directly outside of our sample receiving area and will disinfect them after any contact.  We ask that if you are dropping off samples to use these locations and to ensure proper personal space and have all sample paperwork in order.  Our staff will continue to process all samples that are shipped to our facility.

Please feel free to contact us with any questions or concerns.

We have adopted a familiar phrase as we navigate through this trying time,  “Have Faith, Stay Calm and Carry On!”




Sam Modesitt

Joe O’Brien

Jeff Sa



Valley Tech's Services

Since 1997, Valley Tech Ag Lab has provided accurate, precise and timely laboratory analysis for agriculture. We combine state of the art instrumentation with decades of experience to give our clients quality information for making sound agronomic decisions.


Valley Tech Ag Lab was awarded the title of 2018 Agribusiness of the Year by the Tulare County Farm Bureau.


We are now accepting soil samples from international customers!  If you are located outside the U.S. and would like to have some samples analyzed, please use the form below to contact us for information about sample collection and shipping.

  • Soil Analysis
  • Plant Tissues Analysis 
  • Irrigation Water Analyses
  • Manure, Compost, Lagoon Water Analysis
  • Feed and Harvested Nutrient Analysis
  • Sampling


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Method References

  • Soil, Plant and Water Reference Methods for the Western Region 
    2nd Edition, 2003
    Dr. Ray Gavlak, Dr. Donald Horneck, Dr. Robert O. Miller and Dr. Janice Kotuby-Amacher
  • California Analytical Methods Manual 
    UC Davis College of Agricultural and Environmental Sciences, 2010
    Dirk Holstage, Patricia Price, Robert O. Miller, Deanne Meyer.
  • Recommended Methods of Manure Analysis 
    University of Wisconsin, 2003
    John Peters
  • Standard Methods for the Examination of Water and Wastewater
    21st Edition, 2005, APHA, AWWA, WEF
  • Official Methods of Analysis of the Association of Official Analytical Chemists
    16th Edition, 1999, AOAC
  • Test Methods for the Examination of Composting and Compost
    TMECC, US Composting Council and Education Foundation
    US Department of Agriculture, 2001
  • Diagnosis and Improvement of Saline and Alkali Soils
    Handbook 60, California Department of Food and Agriculture, 1954
    L. A. Richards