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Ammonium sulphamate (Dax "Root-Out")Not organic. To kill comfrey, horseradish and other awkward weeds safely, cut the crowns off just below the surface with a spade and spread about ¼ ounce of ammonium sulphamate on the cut surface of the roots left in the ground. This will destroy them completely, and after about four weeks, the chemical becomes sulphate of ammonia, which is a common chemical fertiliser and washes harmlessly from the soil. It can be used to kill swarms of small comfrey plants where a Rotavator has been used in an attempt to kill comfrey, or where it has been dug out, leaving the soil full of fragments. Stir 1 lb of the white crystals into a gallon of water and apply with a rosed can over a 10 foot square area. In eight weeks any crop can be sown or planted after it. It is never poisonous to birds or pets, and it produces an increase in the worm population after use.
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