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CHEMIGATION
ALFALFA
Apply this product only through center pivot sprinkler
irrigation systems. Do not apply this product through any
other type of irrigation system.
Crop injury, lack of effectiveness, or illegal pesticide
residues in the crop can result from nonuniform distribution
of treated water.
Make a single application during the winter months when
alfalfa plants are in the least active stage of growth and/or to
stubble after cutting following hay removal and before
regrowth exceeds 2” in height.
Severe alfalfa injury may result following application after
cutting if either the regrowth is more than 2” high or
significant stubble is left after alfalfa cutting.
If you have questions about calibration, you should contact
State Extension Service specialists, equipment manufac-
turers or other experts.
A person knowledgeable of the chemigation system and
responsible for its operation, or under the supervision of the
responsible person, shall shut the system down and make
necessary adjustments should the need arise.
DORMANT APPLICATIONS
Select the appropriate rate (see Use Rates section) for soil
texture and organic matter content using 0.25” to 0.75” of
sprinkler irrigation as a continuous injection during the
application. Best results are obtained when soil is moist at
time of application, and when weeds have not germinated or
are less than 2” tall or across.
APPLICATION AFTER CUTTING
Apply DuPont™ VELPAR® DF at 5.3 ounces per acre to
stubble after cutting, following hay removal, and before
regrowth exceeds 2” in height. Apply VELPAR® DF using
0.25” to 0.75” of sprinkler irrigation as a continuous
injection during the application. Best results are obtained
when soil is moist at time of application and when weeds
have not germinated or are less than 2” tall or across.
NOTE: Making an application when daily temperatures are
forecast to be in the mid-to-high 90 degree range within 3 to
5 days after treatment may increase the potential for crop
injury.
SPRINKLER CHEMIGATION
The system must contain a functional check valve, vacuum
relief valve, and low pressure drain appropriately located on
the irrigation pipeline to prevent water source contamination
from backflow.
The pesticide injection pipeline must contain a functional,
automatic, quick-closing check valve to prevent the flow of
fluid back toward the injection pump.
The pesticide injection pipeline must also contain a
functional, normally closed, solenoid-operated valve located
on the intake side of the injection pump and connected to
the system interlock to prevent fluid from being withdrawn
from the supply tank when the irrigation system is either
automatically or manually shut down.
The system must contain functional interlocking controls to
automatically shut off the pesticide injection pump when the
water pump motor stops.
The irrigation line or water pump must include a functional
pressure switch which will stop the water pump motor when
the water pressure decreases to the point where pesticide
distribution is adversely affected.
Systems must use a metering pump, such as a positive
displacement injection pump (e.g., diaphragm pump)
effectively designed and constructed of materials that are
compatible with pesticides and capable of being fitted with
a system interlock.
MIXING INSTRUCTIONS
1. Fill the supply tank 1/4 to 1/3 full of water.
2. While agitating, add the required amount of VELPAR®
DF and continue agitation until the VELPAR® DF is
fully dispersed, at least 5 minutes.
3. Once the VELPAR® DF is fully dispersed, maintain
agitation and continue filling tank with water.
VELPAR® DF should be thoroughly mixed with water
before adding any other material.
4. As the tank is filling, add tank mix partners (if desired).
Follow use precautions and directions on the tank mix
partner label.
5 After thorough mixing, the agitation system can be
stopped to prevent excessive foaming in the tank. Once
thoroughly mixed the solution in the supply tank does not
require additional agitation unless specified on the
companion products label. If foaming occurs in the
injection supply tank, a defoaming agent (defoamer) may
be added.
6. Apply VELPAR® DF spray mixture within 48 hours of
mixing to avoid product degradation.
USE PRECAUTIONS - CHEMIGATION
•
Do not connect an irrigation system (including
greenhouse systems) used for pesticide application to a
public water system unless the pesticide label prescribed
safety devices for public water systems are in place.
•
Distributing treated water in an uneven manner can result
in crop injury, lack of effectiveness, or over-tolerance
pesticide residues in the crop. Therefore, to ensure that
the mixture is applied evenly at the recommended rate,
use sufficient water, apply the mixture for the proper
length of time and ensure sprinkler produces a uniform
water pattern.
•
Do not permit run-off during chemigation.
POSTING OF AREAS TO BE TREATED
Posting of areas to be chemigated is required when 1) any
part of a treated area is within 300 feet of sensitive areas
such as residential areas, labor camps, businesses, daycare
centers, hospitals, in-patient clinics, nursing homes, or any
public areas such as schools, parks, playgrounds, or other
public facilities not including public roads, or 2) when the
chemigated area is open to the public such as golf courses or
retail greenhouses.
Posting must conform to all the following requirements:
• Treated areas shall be posted with signs at all usual points
of entry and along likely routes of approach from the
listed sensitive areas. When there are no usual points of
entry, signs must be posted in the corners of the treated
areas and in any other location affording maximum
visibility to sensitive areas.
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