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One of the first people who wrote about the benefits of worm castings was the Australian, Dr. Thomas Barrett. He experimented with worm castings on his farm producing: Carrots of 3 Kg each, Turnips of 3.5 Kg each, Potato crops of 30 tons per acre, and Onion crops of 21.5 tons per acre. (1 Kg = 2.2 LB)

Here are other testimonials from around the world:

"Vermicompost outperforms any commercial fertilizer I know of. The key factor is microbial activity. Research that I and other have done shows that microbial activity in worm castings is 10 to 20 times higher than in the soil and the organic matter that the worm ingests…."

Dr. Clive Edwards, BioCycle, Oct. 1994

"The activity of the earthworm gut is like a miniature composting tub that mixes, conditions, and inoculates the residues into a terrific product!"

Dr. Bill Becker, The benefits of Earthworms in Natural Foods and Farming, July/August 1991

"Earthworm castings are the best imaginable potting soil for greenhouses or house plants, as well as gardening and farming. It will not burn even the most delicate plants and all nutrients are water-soluble, making it an immediate plant food. The effect of earthworm castings used in any of these ways is immediately visible. They make plants grow fast and strong."

R.E. Gaddie and D.E. Douglas in Scientific Earthworm Farming Vol. 1, 1975

"Castings contain 5 times the available nitrogen, 7 times the available potash and 1.5 times more calcium than that found in 6 inches of topsoil. Therefore, castings are supplied with available nutrients. The nutrients are also water-soluble and immediately available to the plant. You will find that most potting soils have a nutrient life for 2 to 5 days. Also, worm castings hold 2 to 3 times their weight in water. That means you water less and the pot will stay damper for a longer period."

Kids for Landcare: Wormwatch, Education Department of South Australia, 1992