Lawn & Garden Soil Health Testing

Are you concerned your plants aren’t getting the proper nutrients this season? Confused about which fertilizers to use in your garden? Lawn and garden soil testing can help! Simply send your sample to us for a comprehensive analysis of your lawn and garden soil. Choose from three test packages or select analysis ala cart.

Factors we analyze include:

  • Major, secondary and minor nutrients
  • pH levels and buffer pH
  • Organic matter

Nurture your professional or home lawn with confidence this year. Our soil analysis is delivered with actionable advice to keep your lawn or garden looking its best.

Have questions about how to choose or use our lawn & garden soil testing kits? Contact us online and get in touch with one of our experts today.

Testing Options

AgSource Laboratories can test for basic macronutrients, like N, P and K, as well as several micronutrients. Not sure which package suits your needs? We recommend starting with basic package for first time samplers. It’s important to include pH in your test package because pH can affect the availability of other nutrients in the soil.

In addition to analytical data, we can also provide interpretive ranges and recommendations. Contact your preferred AgSource Laboratories location for more details.


Lawn & Garden – Basic

Lawn & Garden – Routine: the Basic package plus…

  • Magnesium
  • Calcium
  • Cation Exchange Capacity
  • Base Saturation

Lawn & Garden – Complete: the Routine package plus…

  • Boron
  • Sufur
  • Manganese
  • Copper
  • Iron
  • Zinc

Wildlife Food Plots – Looking to improve your wildlife food plot this season? Start with a soil test. Then use the results to fine-tune your fertilizer applications and ensure better growth for next year.

  • Phosphorus
  • Potassium
  • Soil pH
  • Lime Requirements

* Packages vary by location. For exact package details for your specific location, please contact your sales representative, email us or call the lab today. 

Sampling Guide

Where to Take Lawn & Garden Soil Samples
Be sure the soil sample is representative of the entire lawn or garden by preparing a composite sample. You can do this by collecting small cores of soil from five locations in the sampling area, and then combining them into one sample. Do not include soil from both a lawn and garden area in the same composite sample.

If you think your lawn or garden has large areas that differ in fertility, divide the area being sampled into two or more parts and prepare a composite sample from each part. With a lawn, take a composite sample from the front lawn and another from the back lawn. Or, take a composite sample from a shaded area and another from an open or sunny area.

How to Take Soil Samples
A garden trowel, small spade, or bulb planter is recommended. Sample gardens to the depth of tillage, normally about 5 to 7 inches. Sample established lawns to the depth of 3 inches. Remove all grass and other materials from the composite sample and mix the soil thoroughly. Place one-half cup of soil into the soil sample bag. Complete the sample submission form and send it with the sample to the lab.

Results & Reports

How much Fertilizer should I Use?

  1. Convert the lbs/acre recommendation to lbs/1000 ft2 for smaller areas.

  2. Multiply the nutrient recommendation times the square footage of your garden, then divide by 1000.

  3. Take the value you get from step 2 and divide by the percent analysis of the nutrient in the fertilizer you plan to use.



Garden Area =

500 ft2

Nitrogen Rec =

40 lbs/acre

Convert to Lbs/1000 ft2 =

0.8 lbs/1000 ft2

Amount of actual N needed =

0.8 X 500 ÷ 1000 = 0.4 lbs

Fertilizer you might use =

21-0-0 (Ammonium Sulfate) = 21% Nitrogen

Actual Amt of 21-0-0 to use =

0.4 ÷ 0.21 = 1.9 lbs of 21-0-0 on your 500 ft2


Links to University Resources