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How To Determine Soil Texture

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By Linda-reply42 (room42)
April 1, 2007
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Soil Texture Procedure: This test requires few tools, and is relatively fast. It will help you know if you have an extremely sandy soil, clayey soil, or something in between. I have just moved, and after the winter ground thaws, I will be doing this test on my own soil. You need a container with fairly precise measurements. I am going to use my 2 cup Pyrex kitchen measuring cup for measuring. But you also need a container, where you can shake your soil sample, mixed with water. I am going to use a quart canning jar to do my shaking, and immediately pour the solution into the Pyrex measuring cup.

Gardening picture

  1. Obtain your soil sample by digging down 6 inches. Combine 3 such soil samples, as your soil may be different in different spots.
  2. Fill a quart canning jar with 1/2 cup of your soil sample.
  3. Dilute the sample by adding 1 & 1/2 cups of water.
  4. Add either 1/2 teaspoon of salt, or 1/2 teaspoon of dishwashing detergent.
  5. Cap the canning jar and shake for 2 minutes.
  6. Immediately after 2 minutes of shaking, pour the contents of the quart canning jar into your 2 cup Pyrex measuring cup.
  7. Allow the 2 cup Pyrex measuring cup to stand for exactly 30 seconds. Measure the height in ounces (or ml) of the soil particles that have settled at this time. This is the sand portion. Record this value.
  8. Allow the 2 cup Pyrex measuring cup to stand undisturbed for 30 minutes. Measure the height in ounces (or ml) of the soil particles that have settled at this time and record that value. Subtract the first (30 second) reading. This difference is the portion of soil that is silt.
  9. Now let the 2 cup Pyrex measuring cup of soil stand for at least 24 hours. At the 24-hour point, take another reading. Subtract the height at the 30 minute reading. This difference is the clay portion of the soil. If the water is still very cloudy, take another reading after it has completely cleared. Compare it to the 24-hour reading. If the level has risen, subtract the 30-minute reading from this value, and use this for the clay reading.
  10. Now, put the three height readings in the form of percentages. For example;

Height in ounces after: Corresponds to fraction of: Example - total height in ounces: Difference in height, or portion: Portions expressed as percentage:
30 seconds sand 4 oz 4 oz 4/8 = 50 %
30 minutes silt 5 oz 1 oz 1/8 = 12.5 %
24+ hours clay 8 oz 3 oz 3/8 = 37.5 %
      total = 8 oz  

Using the soil texture triangle, find the spot on the diagram that corresponds to the fractions of sand, silt and clay in your soil test. Write down the name of your soil texture. In the example, the soil texture as determined by the triangle for a soil with 50% sand, 12.5% silt and 37.5% clay is a Sandy Clay Soil. You can now use this soil texture classification when estimating water, and fertility requirements of your soil, as well as choosing the best ammendment for your soil.

A sandy soil is one with large particles that drains quickly but holds nutrients poorly.

A clay soil is composed of extremely small particles, with a large capacity for holding water and dissolved plant nutrients. Un amended clay soil is sticky, heavy, and hard to breathe. It tends to expand when wet and crack apart when dry.

A silt soil is one with medium-size mineral particles, larger than clay and smaller than sand. Silt adds little to the characteristics of a soil.

The term loam refers to a soil with a combination of sand, silt, and clay sized particles.

Originally published at Reply42.com/garden Soil Tilth, permission granted to Dave's Garden for reuse.

Linda-reply42


  About Linda-reply42  
Linda-reply42Occasional Professional Landscaper & once trained Colorado Master Gardener. My garden feeds my soul.

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Subject: How about roses?


Posted by pammee62 (from Charleston, WV) on June 7, 2007 at 11:27 AM:

We pastor a church, and the parsonage has about 12 rose bushes on each side of the house, all different, beautiful and fragrant. I was told by one of our elderly ladies that her grandmother use to start rose bushes from already established ones, from the blooms that die off. She said to plant them, bloom side down into the soil, and it would grow a rose bush. We have just bought a house, and I would LOVE to take a few of these rose bushes with me. Is it possible to do this, and if so, how exactly would I do it. The picture you see is just one of the gorgeous roses from one of these bushes.

...

Posted by fljm (from Clinton, IA) on January 20, 2008 at 6:55 PM:

Pammee62,
I have been raising roses for forty years and have never heard of this. I will definitly try it if I don't hear any different.

...

Subject: Pretty Pic

Posted by scordra (from Coos Bay, OR) on June 4, 2007 at 10:26 PM:

What is the plant in th picture accompanying your article on propagatio by 'cuttings'? It's GORGEOUS!!!

...

Subject: "Cutting Edge"

Posted by dshore95 (from Rohnert Park, CA) on May 19, 2007 at 12:52 AM:

Thanks for this informative and helpful article.

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Subject: plants from cuttings

Posted by AmandaTaylor7 (from Alvin, TX) on May 9, 2007 at 11:16 AM:

Incredibly interesting and helpful information! Thanks!

...

Subject: plants from cuttings

Posted by bonrig (from Saint Petersburg, FL) on May 5, 2007 at 6:05 AM:

What excellent, sucinct advice. I knew many of the things (from good and bad experience) of which you wrote but also learned some tips I didn't know. It's good to have my experience and instincts confirmed. Thank you.

...

Posted by beachcoat (from Adelaide
(Australia)) on May 29, 2007 at 7:58 AM:

I have been experimenting with several varieties of tomato plant cuttings. I have found that smaller, young stems rot and die more readily than larger, thicker stems. I use a rooting hormone powder, a little seaweed-based plant food and coconut coir which is soft, drains well yet retains moisture. To date, my most successful cuttings are those that were planted one to two feet in length. I've read that tomato plants grown from cuttings fruit better. Has anyone experienced this?

...

Posted by happy_macomb (from Chevy Chase, MD) on August 6, 2007 at 5:28 AM:

You might want to post this in the tomatoes forum -- see [HYPERLINK@davesgarden.com]

...

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