Welcome to TP&S Lab

TP&S Lab, established in 1938 in the heart of the Rio Grand Valley, is a leading national testing lab for Soil, Plant, and Water analysis.

For over 75 years we have been perfecting the process of laboratory soil analysis, the Daubeny Extraction Method, utilizing Carbon Dioxide (CO2) to mimic the way plants naturally take in nutrients, and the Albrecht system of fertility balancing for optimum crop yields.

If you don't know what is in your soil or water, if you are at a loss to explain poor plant performance, if you have been told your soil or water or plants are beyond help, if you desire better yields and consistent harvest, or if you are unaware of the heavy metals in your soil, water and crops, we can help.

Our spectrum of services range from mail-in soil test kits for the
at-home enthusiast, to resellable services for commercial providers such as nurseries, landscapers and greenskeepers, to government contracts, agri-corps and universities all over the world.

In conjunction with the most accurate of laboratory results in the industry and the closest to Nature of methods, TPSL specializes in soil fertility and plant nutrition. We have trained and certified professionals who have interpreted tens of thousands of soil test over decades of years.

Our proprietary Ask the Plant® program allows you to dynamically adjust your fertilization program to accommodate your crop's ever-changing nutritional requirements throughout the growing season resulting in higher crop yields, reduced water use, eliminating fertilizer waste and ensuring a healthy, safe product.

We are proficient in all chemical, organic, biological and physical aspects of agricultural science.

On our site you can review our services for soil, plant, and water testing, analysis and recommendations. We are also able to accommodate special requirements testing not see here.

Please contact us today at 956-383-0739 and speak with us
about your needs.

Testing Catalog and Fee ScheduleWe've come out with a new Fee Schedule, effective February 1st, 2016.


Address changed from 5115 to 4915 (but we're still in the same place)
Added Selection Guide to Soil Tests for Lawns, Gardens and Flower Beds

New Soil Tests:
● SO-15 – Aqua Regia Total Extraction (Now Listed)
● SO-16 – Quantum Total Nutrients Soil Test Suite (Now Listed)
● SO-17 – Landscapers' Comprehensive Soil Test Package For Landscape Architects
● SO-51 – Trees & Shrubs (Two Tests)
● SO-52 – Pasture / Forage
● SO-53 – Legumes
● SO-54 – Small Grains & Grasses
● SO-55 – Turf Grass, Lawns & Athletic Fields

Updated Soil Tests:
● SO-50 – Grapes: Now includes Molybdenum (New Price)

New Add-On Tests To Basic Soil Tests
● SAO-11 – Soluble Silicon
● SAO-12 – Micronutrients For Mehlich III Tests (Special Price)
● SAO-13 – Aluminum (Special Price)

Changed Add-On Tests To Basic Soil Tests:
● SAO-53 Rush Service Price Reduced

New Add-On Test to Basic Ask The Plant® Tests:
● PL-11 – Silicon

New Add-On Heavy Metals Test
● SN – Tin

Changed Fertilizer Test Listing
● F-11 – Phosphate Only

Reference Section
● Added Leaf / Petiole Sampling Guide

You can now order all of our testing online!
Click Here for more information and to order.

Shows and Appearances