on-farm systems, accuracy cannot be achieved at such low volumes, and
it is extremely important to reduce total line volume and/or diameter of the
delivery tubes from the manifold to the chisels so as to guarantee adequate
back pressure at the point of fumigant release. With a high-barrier mulch,
uniformity of application along and between the rows was compromised
In all probability, use of these more gas-retentive mulches will require
and uniform dispensing of such low fumigant application rates (10 to 15
gallons per acre). These required changes include smaller delivery tubing
uniformity among chisel streams, and installation of a low-pressure gauge
information, readers are advised to review “Application Considerations for
Successful Use of VIF and Metalized Mulches with Reduced Fumigant
Table 4.4
required for use of high barrier TIF and VIF mulches and reduced rate
applications of soil fumigants.
1. Replace tubing from manifold to chisels with smaller diameter poly tubing to
3. Install a low pressure gauge (0-30 psi) immediately upstream of the manifold or
2019 Vegetable Production Handbook of Florida 31