Agriculture Reference
In-Depth Information
There are two major methods of using vapor-proof tarps:
•
Tarp supported off the ground and sealed around the edges: fumigant
introduced under the tarp.
•
Tarp applied to the soil by the injection chisel applicator immediately
after the fumigant is injected.
Highly volatile fumigants must be handled in closed pressurized contain-
ers or tanks. The equipment is similar to gravity-flow, low-pressure fumiga-
tors. The pressure in the tank maintains the pressure at the nozzle orifices.
The tank is either precharged with sufficient pressure to empty its contents, or
an inert pressurized gas is fed into the tank during application to displace the
fumigant. A gas pressure regulator maintains uniform pressure in the system.
To insure accurate application, the fumigant must be under enough pressure to
maintain a liquid state in the tank, pressure lines, manifold, and metering de-
vices.
1. Selection
Pumps, tanks, fittings, nozzles or metering orifices, and lines must be
corrosion-resistant. Soil injection knives should be designed to shed trash and
allow the soil to seal over the fumigant.
Select high-pressure fumigators designed to handle the pressure created by
the fumigant and the corrosive action of the product you plan to use.
Figure 8.20
Workers setting tarps for fumigation of a field.
