THE CONTROL OF NUT GRASS WITH CHLOROPICRIN

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Abstract
Exptl. work is presented to demonstrate that chloropicrin fumigation is an effective means of eradicating nut grass (Cyperus rotundus) from the soil. The chloropicrin is applied in the dry soil in holes at 12- to 15-inch intervals, at the rate of about 21/2 cc. per sq. foot (400 pounds per acre). The gas is confined for 3 or 4 days by covering the soil immediately after treatment with a sheet of gas-impervious paper buried at the edges about 5 inches, or by keeping the upper surface of the soil wet to a depth of 2 in. In loose dry soil the "nuts" are killed to a depth of 20 in. The treatment costs about $1.00 for 100 sq. feet.

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