Manual for Training of Extension Workers and Farmers on ... - DTIE

Dazomet is a granular pre-planting soil chemical <strong>and</strong> has been reported to control
weeds, nematodes <strong>and</strong> fungi. It requires mechanical distribution in the soil <strong>for</strong> good
movement <strong>and</strong> efficacy. During the treatment the soil should be covered with plastic
sheets. The application rate is 80-100 g / m 2 (with <strong>for</strong>mulations at 99 % <strong>of</strong> a.i.).
1,3 dichloropropene (1,3-D)
1,3 dichloropropene is a liquid pre-planting fumigant that rapidly evaporates <strong>and</strong>
diffuses as a gas through the soil. It is applied to the soil by injection <strong>and</strong> provides
effective control <strong>of</strong> nematodes, insects, some weeds <strong>and</strong> some pathogenic fungi.
During treatment the soil remains covered with plastic mulches.
1,3-D is usually applied in combination with other chemicals such as chloropicrin,
metam sodium, etc. Application rate is 12-20 ml / m 2 (with <strong>for</strong>mulations at 97 % <strong>of</strong>
p.a.); higher rates are applied in heavy soils. It is applied using an injection device
through injection nozzles mounted on two levels. Peristaltic pumps guarantee the
distribution. The flow <strong>of</strong> the chemical depends on the velocity <strong>of</strong> the tractor. Since 1,3
dichloropropene is highly volatile, the plastic covering has to be put in position
immediately after application. Uni<strong>for</strong>m application <strong>of</strong> the chemical by adjusting the
speed <strong>of</strong> the tractor <strong>and</strong> calibrating the nozzles <strong>of</strong> the application machine is highly
recommended.
33