Methyl Bromide for Sterilizing Small Quantities of Soil
The following simple method of sterilizing small quantities of soil with methyl bromide materials (Dowfume G and Iscobrome) was developed by Professors Newhall, Lear, and Tyler of Cornell's Department of Plant Pathology. Gas-tight containers, such as garbage cans or metal drums, are used to hold the soil. We use garbage cans of about 22 gallons capacity, since these hold 3 cubic feet of soil and have tight lids. The Dowfume G or Iscobrome is used at the rate of 50 cubic centimeters or 1 2/3 fluid ounces (2 tablespoonfuls plus 2 teaspoonfuls) per cubic foot of soil. One cubic foot of soil is equal to 7.3 gallons; hence a 50 gallon drum would hold 50 + 7.3 or approximately 7 cubic feet. 7x1 2/3 or approximately 12 fluid ounces (1 Va cupfuls) would be needed for this amount of soil, and 3x1 2/3 or 5 fluid ounces Qh cupful plus 2 tablespoonfuls) for the 3 cubic foot garbage can.
Source: • Massachusetts Flower Growers Association Bulletin #86