Soil Testing
Soil Testing
Soil Testing
Soil Testing
UOG Soil Lab
Location: Agriculture & Life Sciences Bldg., Room 216
Tel: (671) 735-2143/34 / (671) 988-9194
Email: soillab@triton.uog.edu
The Soil Lab under UOG Land Grant conducts soil analyses for farmers and gardeners wanting to improve their crop production as well as for business clients in landscaping, construction, and other industries.
How to Use Our Soil Testing Service
-
Review the Soil Tests & Fees below to determine the tests you need. If you're not sure, please call us at +1 (671) 988-9194 or +1 (671) 735-2143 or email us at soillab@triton.uog.edu to get a recommendation.
-
Deliver your soil samples to Room 216 between the hours of 8 a.m. and 3:30 p.m. Monday to Friday along with your order form and payment. (For off-island samples, please see the Off-Island Soil Analyses section below.)
-
Receive your soil test results in 15-20 business days. If you need assistance interpretting the results, call us at +1 (671) 988-9194 or +1 (671) 735-2143 or email us at soillab@triton.uog.edu.
Soil Tests & Fees
|
Item |
Description |
Unit |
Price (US$) |
|
1 |
pH |
per sample |
$30 |
|
2 |
Electrical Conductivity |
per sample |
$30 |
|
3 |
Organic Matter (commercial) |
per sample |
$100 |
|
|
Organic Matter (research) |
Per sample |
$50 |
|
4 |
Phosphorus (Olsen) |
per sample |
$55 |
|
5 |
Phosphorus (Bray 1) |
per sample |
$55 |
|
6 |
Potassium |
per sample |
$55 |
|
7 |
Sodium |
per sample |
$55 |
|
8 |
Calcium |
per sample |
$55 |
|
9 |
Magnesium |
per sample |
$55 |
|
10 |
Cation Exchange Capacity |
per sample |
$70 |
|
11 |
CaCO3 |
per sample |
$92 |
|
12 |
Particle size analysis (commercial) |
per sample |
$100 |
|
|
Particle size analysis (research) |
per sample |
$50 |
|
13 |
Total Nitrogen |
per sample |
$120 |
|
14 |
Total Carbon |
per sample |
$120 |
|
15 |
Nitrate Nitrogen |
per sample |
$75 |
|
16 |
Ammonium Nitrogen |
per sample |
$75 |
|
17 |
Sulphate |
per sample |
$75 |
|
18 |
Bulk density |
per sample |
$50 |
|
19 |
Porosity |
per sample |
$50 |
|
20 |
Moisture content |
per sample |
$50 |
|
21 |
Dry aggregate stability |
per sample |
$70 |
|
22 |
Wet aggregate stability |
per sample |
$80 |
|
23 |
Active carbon |
per sample |
$70 |
|
24 |
CO2 burst method |
per sample |
$85 |
|
25 |
Metal by Flame (Silver-Ag) |
per sample |
$65 |
|
26 |
Metal by Flame Cadmium |
per sample |
$65 |
|
27 |
Metal by Flame Cobalt |
per sample |
$65 |
|
28 |
Metal by Flame Nickel |
per sample |
$65 |
|
29 |
Metal by Flame Lead |
per sample |
$65 |
|
30 |
Metal by Flame Sulphur |
per sample |
$65 |
|
31 |
Metal by Flame Zinc |
per sample |
$65 |
|
32 |
Metal by Flame Iron |
per sample |
$65 |
|
33 |
Metal by Flame Manganese |
per sample |
$65 |
|
34 |
Metal by Flame Copper |
per sample |
$65 |
|
35 |
Extended Hours Fee (Monday to Friday, non-regular working hours) |
prepayment required |
$100 |
|
36 |
Extended Hours Observed (Weekend, non-regular working hours) |
prepayment required |
$100 |
|
37 |
Extended Hours Fee (Observed Holidays, non-regular working hours) |
prepayment required |
$100 |
|
38 |
Expedite Hours Fee (Friday) |
Analysis subtotal x2 per customer |
$100 |
|
39 |
Expedite Report (5 working days) - Rush |
per 5 samples |
$100 |
|
40 |
Expedite Report (3 working days) - Urgent |
per 5 samples |
$150 |
|
41 |
Sampling |
per hour |
$100 |
|
42 |
Disposal |
$100 |
|
|
43 |
Sampling bags |
per 20 samples |
$20 |
|
44 |
Reporting |
$50 |
|
|
45 |
Recommendation |
$100 |
|
|
46 |
Distilled/Deionized water |
per 5 gallons |
$20 |
Notes:
- Payment is required before any analysis will be carried out. Payment may be made by check, credit card authorization form, or electronic transfer.
- Results will be available between 15 and 20 working days.
- All tests include free recommendations and sampling bags from the University of Guam Soil Lab. To reduce environmental pollution, the University of Guam Soil Lab has environmentally friendly sampling bags. Kindly call (671) 735-2143 before taking your samples to get these bags.
Discounts:
- 10% discount on orders of $1,000 or more.
- Research receives 20% discount on orders of $1,000 or more.
- Bonafide farmers registered with the Guam Department of Agriculture receive a discounted rate of $50 per sample for routine soil analysis.
Payment:
Payment is required before any analysis will be carried out. Payment may be made via:
- Check: Please make checks payable to “UOG Soil Lab, University of Guam” and indicate the following in the Memo line: “Account No. 61-00-246031-0-4401010”
- Credit Card: Please fill out a credit card authorization form and email to rbalaan@triton.uog.edu.
- Electronic/Wire Transfer: Please fill out the wire transfer form and email to rbalaan@triton.uog.edu.
Sample Drop-Off and Pick-Up
Dropoff information
Samples can be delivered to Room 216 of the Agriculture & Life Sciences Bldg. on the UOG campus during the hours of 8:30 a.m. - 3:30 p.m., Monday - Friday.
Sample bags: To reduce environmental pollution, the University of Guam Soil Lab has environmentally friendly sampling bags. Kindly call (671) 988-9194 or (671) 735-2143 before taking your samples to get these bags.
Turnaround time for analysis/pickup
The results of your soil test will be available in 15-20 working days. Payment is required before any analysis will be carried out.
Off-Island Soil Analyses
Procedures for Shipping Regulated Soil to the UOG Soil Lab
Shipping Requirements
- All inbound shipments must arrive with an APHIS-approved carrier, along with a PPQ Form, an inspection certificate, and soil treatment documentation.
- A notification must be sent to the UOG Soil Lab contact at least 48 hours prior to shipment.
- Soil samples should be stored in a dedicated, sealed container and transported in transport tubs lined with plastic sheeting.
- Information on the log receipt date, shipper, quantity, condition, and seal integrity should be included and recorded in the Regulated Materials Logbook.
Triple Containment Packaging Requirements
- The primary (inner) container must be watertight and securely sealed (e.g., vial, Ziplock bag, test tube) to hold the material and withstand pressure and temperature changes.
- The secondary container should be a strong, waterproof outer layer with an absorbent material (for liquids) to hold the entire contents of the primary container in case of a spill.
- The outer tertiary container should be a sturdy, durable shipping box that can withstand drops, stacking, transportation, and close securely.
The original permit-specific label should be attached to the outer package.
The University of Guam Soil Lab is a registered member of the North American Proficiency Testing Program, a program of the Soil Science Society of America.
Last updated: April 1, 2026
