How to Test Soil With Rapitest

Written by susan reynolds
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How to Test Soil With Rapitest
Test your gardening soil annually to make sure your plants will grow strong. (preparing soil for garden image by Cherry-Merry from Fotolia.com)

Rapitest is a product used to test the pH level of soil, as well as nitrogen, phosphorus, and potash. These elements help plants grow strong and healthy by providing necessary minerals. If you are planning on creating an outdoor garden, it is a good idea to test the soil for these vital elements using the Rapitest product. If anything is lacking, you can replace it before you plant. It is much better to start a garden with healthy soil than waiting until your seeds are already planted.

Skill level:
Moderately Easy

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Things you need

  • Rapitest kit
  • Distilled water
  • Large container with lid
  • Test chambers
  • pH, nitrogen, phosphorus, potash test capsules
  • Soil samples
  • Measuring cups
  • Water dropper

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Instructions

    pH Test

  1. 1

    Gather a soil sample of your gardening soil and place it into the test chamber up to the fill line.

  2. 2

    Unscrew the "pH" bottle that contains pH testing capsules. Split a capsule in half and empty the powdery contents into the test chamber.

  3. 3

    Use the water dropper to add distilled water to the test chamber up to the "water fill" line.

  4. 4

    Place the cap on the test chamber and shake it vigorously.

  5. 5

    Let the test chamber sit still for a minute to allow the colour to develop.

  6. 6

    Hold the test chamber against the colour comparison chart and find the matching pH by colour.

    Nitrogen, Phosphorus or Potash Tests

  1. 1

    Place one cup of a soil sample into a clean dry container.

  2. 2

    Add five cups of distilled water to the soil. Place the cover on the container and shake it vigorously for one minute. Let the container sit for 24 hours and do not disturb it.

  3. 3

    Use a water dropper to suck up some of the dirty water that has risen to the top of the container. Empty the dropper into a clean, empty test chamber up to the fill line.

  4. 4

    Split either a nitrogen, phosphorus, or potash capsule and empty the contents into the test chamber. Place the cap on the test chamber and shake it vigorously.

  5. 5

    Let the test chamber sit still for a minute to allow the colour to develop for 10 minutes. Hold the test chamber against the colour comparison chart and find the matching pH by colour. Repeat the steps to test the soil for other elements.

Tips and warnings

  • Test the soil before every seasonal planting.

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