Soil, Water and Forage Analytical Laboratory (SWFAL)

Submitting a Sample

Submitting a Sample


Where to Submit Samples for Analysis

The OSU Soil, Water & Forage Analytical Laboratory works in conjunction with the Oklahoma Cooperation Extension Service.  To help serve the state of Oklahoma with testing Services, each County Extension Office is set up to take samples for analysis.  You are encouraged to take your sample to your local County Extension Office (Click Here for county directory).

Step 1.  Obtain the proper sample bag/container from the local County Extension office.  It is important for samples to be in the correct containers.
  1. Properly sampled soil should be put in a soil bag.  Please fill the bag.  The Lab WILL NOT accept a bag less than half full.
  2. Water should be put in the 4 oz plastic water bottles
  3. Forage/Solid Feed/Plant Tissue should be put in the Forage Bags.  Liquid feed(can only run Protein) should be put in the 4 oz plastic bottle.
  4. Animal waste Solid/Compost must be put in two plastic zip bags.  Liquid should be put in the 8 oz plastic container and only filled half; then the plastic container should be put in a zip bag.  Liquid animal waste has a tendency to expand and can explode in transit.  The plastic zip bag can help keep everything contained and not lost in transit. 

Step 2.  Properly Collect the sample (click on sample type)

 A.  Soil Sample

 B.  Water Sample
  1. Obtain a clean 4 oz water bottle from the County Extension office.
  2. Go to the water source that you want to test.
  3. Fill the water bottle half way, shake and rinse the bottle and pour out.
  4. Repeat step c. three more times
  5. Finally fill the bottle as full as possible getting all air out of the bottle.  Cap and submit to county.
 C.  Forage Sample
 D.  Animal Waste and Compost Samples
 F. Plant Tissue Samples - These samples can be in forage bags or brown paper bags.  NO PLASTIC  See instructions below for different types  
  1. Different Crops
  2. Pecan and Tree Fruits
  3. Grape Petioles

Step 3.  Clearly mark what test is required on the sample bag tag.  If you are not sure what test is needed, your local County Extension can assist with questions.  They are there to help!

Step 4.  Take the sample to the Extension Office.  Payment is expected at time of sample drop off.  Click here for a list of Services and Price List.

HELPFUL HINTS ON TAKING/SUBMITTING SAMPLES

  • The more information put on the tags, the easier the identification in cases where samples are not claimed or labels fall off.
  • Please write in a crop(list found below) on the tag for Fertility and Forage samples.  This not only allows interpretations to be printed on the reports, but also helps with research and statistics done by the lab each  year.
  • Tie all sample bags with a Granny Knot or Double Overhand Knot to ensure no spilling while in transit.  There should not be a gap when closing the bag.  If so, take a little soil out.
  • Please use pencil or ball point pen to mark the sample tag.  Moist soil will cause some inks to run and make it difficult to read the tags after the sample reaches the lab.
  • Always double zip lock bag animal waste samples – Solid, Slurry or Liquid.
  • Comprehensive Salinity needs a FULL bag of soil for the complete test.  If other analyses are needed, submit another bag of soil.
  • If the soil is pretty sandy and Comprehensive Salinity is required – send two bags of soil.  Tie both bags of soil together and mark 1 of 2 and 2 of 2 on the bags.
  • Soil Samples with less than half of a bag should not be sent.  A FULL BAG IS ACCEPTABLE. By filling the bag, this will ensure enough soil to be tested and if more tests are to be added, we can certainly do so.
  • NEVER put PLASTIC bags inside sample bags – Soil or Forage.  It is perfectly fine to put the sample bags in the zip lock. (Samples go into the oven)
  • DO NOT Send Rocks in samples.  This will harm the equipment.
  • DO NOT send oil Saturated Samples.  We can not run them.
  • DO NOT send Glass Containers.
  • DO NOT fill an Animal Waste Liquid Container more than half full.  Animal Waste has a tendency to expand and can potentially explode.
  • DO NOT tape water bottles, just tighten lid properly.
  • SWFAL does not test for Bacteria and trace metals.  Please refer to the listing of Independent Laboratories for these analyses.
  • If accurate moisture results are needed, place the forage bag in a zip-lock bag and seal.

CROP CODE CHOICES:

Crop
Code
#
Crop Possible Yield Goals
Units Estab NRCS Estab
1 Wheat 15 - 100
bu/acre

2 Barley 15 - 100
bu/acre

3 Oats 15 - 100
bu/acre

4 Grain Sorghum (milo)
30 - 230
cwt/acre

5 Corn 40 - 200
bu/acre

5 Sunflower 40 - 200
bu/acre

6 Cotton 0.5 - 3.5
bales/acre

7 Corn Ensilage 5 - 30
tons/acre

8 Sorghum Ensilage 5 - 30
tons/acre

9 Fescue
1 - 5
tons/acre Y Y
 9 Any Cool Season Grass
 1 - 5
  tons/acre  Y  Y
 10 Orchardgrass
 1 - 5
  tons/acre  Y  Y
 11 Rye Grass
 1 - 5
  tons/acre  Y  Y
 12 Weeping Love Grass
 1 - 5
  tons/acre  Y  Y
 13 Bermuda grass
 1 - 7
  tons/acre  Y  Y
 13 Any Warm Season Grass
 1 - 7
  tons/acre  Y  Y
 14 Peanuts
 No yield goal required      
 15 Soybeans
 No yield goal required      
 16 Mungbeans
 No yield goal required      
 17 Cow Peas
 No yield goal required      
 18 Guar
 No yield goal required      
 19 Small Grains for Grazing
 0.5 - 3
  tons/acre    
 20 Legumes in Pasture
 No yield goal required      
 21 Alflafa
 No yield goal required      
 22 Sorghum Sudan Hay
 1-15   tons/acre    

 22 Haygrazer
 1-15   tons/acre    
 23 Garden
 No yield goal required      
 23 Flowers or any vegetable specific
 No yield goal required      
 24 Lawn
 No yield goal required      
 25 Native Hay
 1.0 or 1.5
  tons/acre    
 25 Native Grass
 1.0 or 1.5
  tons/acre    
 26 Hairy Vetch
 No yield goal required      
 27 Other Clover
 No yield goal required      
 28 Millett
 No yield goal required      
 29 Wheat Silage
 No yield goal required      
 30 Feed Mix
 No yield goal required      
 31 Peanut Hay
 No yield goal required      
 32 Trees
 No recommendations given by lab
     
 33 Roses
No recommendations given by lab
     
 34 Bluestem
1-5   tons/acre  Y Y
 35 Arrowleaf Clover
 No yield goal required      
 36  Jose Tall Wheatgrass
1-5
  tons/acre  Y  Y
 37  Canola     cwt/acre    
 38 Grape  No yield goal required      
 39 Johnson Grass
 No recommendations given by lab
     
 40 Wildlife Plot
 No yield goal required
     
 41  Peach Tree
 No yield goal required      
 42 Pecan Tree
 No yield goal required      
 43 Other Orchard
 No yield goal required      

 

Notes

  • If Crop is marked Bermuda grass for Lawn, Lawn Inter will be used.
  • If no crop is provided and CRP is written on the tag, Login will use Bermuda and NRCS Estab.
  • If crop needed is not listed, please use crop above with similar properties.
  • NRCS Estab (COST SHARE) will override Establishment when both are marked.
  • Yield goals listed above give the possible range for recommendations given on reports.

 

Crop Conversion
Conversion Units
Cotton 480 lb/acre
 Wheat  60 lb/bu
 Barley  48 lb/bu
Corn  56  lb/bu
 Oats  32  lb/bu
Sorghum (Milo)
 56  lb/bu

 

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