Sign up for a free account to take advantage of all the new features and to be able to post in the forums. There have been over 33,000 logged entries in the forums since 1998.  Check out the Fun and Magazine Stores.
Welcome, 1 kB

The KISS Plan E-mail
User Rating: / 7
Written by Administrator   
Sunday, 11 September 2005

for Vermicomposting on a Modern Dairy...or Horse...or Hobby Farm

by Jim Jensen, from our issue #18

BENEFITS: Farmers and others will benefit from several advantages of this method:

  • It is simple; no special training is required.
  • Low, low, low start-up cost—it uses existing equipment and available space.

  • No turning, no odors—the worms do all the processing, naturally.

  • The resulting vermicompost, rich in worm castings, is more valuable to farmers, landscapers, and home gardeners than raw manure. It provides stable organic matter, conserves moisture, improves soil conditions in many ways, and enhances the growth and yields of most types of plants. (Current market value is upwards of $30-$90 per cubic yard.)


A windrow is a long row of material (e.g., 4 to 10 feet wide, by 2 to 3 feet high, by some appropriate length). The length can vary depending on the availability of gently sloping space, ease of material handling, or other factors. Longer windrows will cost a little more for supplies.

To start a windrow, spread a 12 to 18 inch layer of manure solids, with or without bedding, along one end of your available space. Innoculate the windrow with high-quality redworms—Eisenia fetida (from a breeding or active pile). For this first row, apply up to 1 lb. redworms per sq. ft. of windrow surface area. Add 2 to 3 inch layers of manure every week (3 to 6 inch layers in colder weather) to gradually increase the depth of the windrow. Each windrow should be large enough to handle these thin layers of material each week. With a thermometer, make sure that the layers of feed do not get hotter than 35°C (~95°F).

Remember the following:

  • This plan is for farm-scale volumes of manure. Larger volumes can help protect the worms from adverse conditions and predators. Enclosed bins are still recommended for home- or school-based vermicomposting.

  • A hard or concrete surface is easier to work on, especially in wet weather, and may even be required to control runoff.
  • As you extend the windrow (Step 2), leave a way to reach the finished castings.
  • This method does not generate high heat. This is acceptable for many types of dairy and horse manure. If heat treatment is needed to control pathogens or weeds, simply precompost the material before feeding it to the worms.


After the first windrow is established and layered to around 2 to 3 feet thick, it is time to extend the windrow. Add the next layers of manure along one side, directly next to and against, the first windrow. The worms in the first pile will gradually migrate toward the fresher feed. Continue adding the fresh manure alongside until you have formed a second complete windrow. Repeat this step, extending the number of windrows to the limits of your need or space. The worms will continue migrating laterally through the windrows, leaving rich vermicompost in their wake.


Redworms tolerate a range of environmental conditions before suffering serious losses. Nonetheless, providing the optimum conditions for worm health and growth can assure maximum decomposition and transformation of organic wastes. Research from around the world and practical considerations suggest the following optimum conditions for redworms:

  • Temperature: 15 to 20°C (60 to 70°F)

  • Moisture content: 65 to 80 percent

  • Oxygen requirement: aerobicity

  • pH: > 5 and < 9

Keep the worms well-fed and comfortable, and they’ll make quality castings in the decomposed manure/bedding. Their active burrowing habits naturally aerate the windrows, providing good control of odors. Leaving each windrow for a little longer time before harvesting assures the vermicompost will be more broken down, more stable, and have more worm castings present.


Moisture is also critical to the well-being of your working worms. A simple method for applying moisture on a farm is through a sprinkling hose or other sprinkling/misting irrigation system. Run it the length of your windrow. Try to moisten evenly, i.e., keep the surface moist, but don’t let the bottom become soggy.


A suitable compost cover, placed over the active windrow, is critical to preserving valuable nutrients in the vermicompost. Rather than nutrients leaching out and possibly contaminating ground or surface waters, they should be retained in the vermicompost in ways that are valuable for plants. Various types of tarps or fabrics could be used to shed excess rainfall and prevent leaching, while maintaining aerobic conditions.

Covering the windrows of finished castings prior to use also retains nutrients and helps prevent weeds from spreading.


Because the worms concentrate in the freshest, most active windrow, after 2 to 6 months the first windrow and each subsequent windrow will become ready to use. It can be spread with a loader or manure spreader. Coarse material, if any, can be screened out to produce a fine, marketable soil amendment.

Last Updated ( Sunday, 18 September 2005 )
< Prev   Next >
Site and contents are © 2007 All Rights Reserved.
Earth Worm Digest is a Public Non-Profit 501(c)3 Organization.
1455 East 185th Street, Cleveland, OH 44110
Office telephone and fax 216-531-5374