. Control of aquatic and ditchbank weeds. Weeds. ditch is usually restored within 24 hours. Dosage depends upon the weed species present. Generally, all submerged aquatics will be killed if exposed for 1 hour to a concentration of 300 parts Benoclor 3C per million parts water, by weight. Around 40 minutes are required at 600 ppm; 2 hours are required at 150 ppm. (Benoclor 3C weighs approximately 11 pounds per gallon; water weighs pounds.) This dosage amounts to ap- proximately 6 gallons of chemical per hour applied in a stream of one cubic foot of water per second. If the operator knows th
. Control of aquatic and ditchbank weeds. Weeds. ditch is usually restored within 24 hours. Dosage depends upon the weed species present. Generally, all submerged aquatics will be killed if exposed for 1 hour to a concentration of 300 parts Benoclor 3C per million parts water, by weight. Around 40 minutes are required at 600 ppm; 2 hours are required at 150 ppm. (Benoclor 3C weighs approximately 11 pounds per gallon; water weighs pounds.) This dosage amounts to ap- proximately 6 gallons of chemical per hour applied in a stream of one cubic foot of water per second. If the operator knows the cross section of the ditch and the speed with which the water moves, he can calculate the rate of application re- quired to provide the necessary 300 parts per million. Application of Benoclor 3C is relatively simple. The most satisfactory unit is a l^-horsepower, air-cooled, gasoline en- gine directly connected to a 3-gallon-per- minute gear pump. This equipment will pump a volume sufficient for several noz- zles at a pressure of 80 pounds per square inch. To prevent overheating, the pump should have a by-pass valve set at 80 pounds, designed to return excess chemi- cal to the spray tank. For the first appli- cation, nozzles with orifices are spaced about 2 feet apart on a boom which lies on the bottom of the ditch. The nozzles should point upstream at an angle of 45 degrees from the bottom of the ditch. Applications may be made at stations lower on the ditch, using the same boom with nozzles having orifices. 1 1 „ II i III. If location permits, the boom may be suspended from a bridge, as shown above. Note how chemical forms a white emulsion in water. [13. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Crafts, Alden Springer, 1897-. Berkeley, Calif. : College of Agriculture, Unive
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