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FORESTRY
IMPREGNATION ON DRY BULK
FERTILIZER
DuPont™ VELPAR® DF is recommended for impregnating
or coating dry bulk fertilizer to be applied on forested sites
for the establishment or release of conifer plantations
(except longleaf pine) as specified on this label.
PLANTS CONTROLLED
Fertilizer impregnated with VELPAR® DF is recommended
for the control and suppression of the weeds and brush
identified for the specific applications on this label. Consult
the appropriate segment of this label to determine the
appropriate rate of VELPAR® DF to be applied per acre.
Apply this amount of VELPAR® DF to the volume of
fertilizer to be applied per acre.
IMPREGNATION EQUIPMENT
To impregnate or coat the fertilizer use a system consisting
of conveyor or closed drum used to blend dry bulk fertilizer.
IMPREGNATION INSTRUCTIONS
To impregnate dry bulk fertilizer with VELPAR® DF, mix
the amount as prescribed above in a sufficient quantity of
water to uniformly coat the desired amount of fertilizer.
Suspensions of VELPAR® DF will require thorough
agitation.
Direct the spray nozzles of the impregnation equipment to
deliver a fine spray of the mixture toward the fertilizer for
thorough coverage while avoiding contact with mixing
equipment. The use of a spray pattern indicator may be
beneficial to visually determine the uniformity of impreg-
nation.
Uniform impregnation of dry bulk fertilizer may vary. If
absorption of the spray is not adequate, the use of an
absorptive powder or additive, such as “Microcel E” or
“HiSil 233”, may be required to produce a dry, free flowing
mixture.
Apply the fertilizer as soon as possible after impregnation
for optimum performance. Impregnated fertilizer may
become lumpy and difficult to apply following storage.
Diammonium phosphate, potassium chloride, 16-16-16 and
24-4-4 have been successfully impregnated.
APPLICATION EQUIPMENT
Applications of impregnated fertilizer may be made by
ground equipment or by air (helicopter or fixed wing).
Accurate calibration and patterning of the equipment is
essential for uniform distribution of the impregnated
fertilizer on the soil surface.
USE PRECAUTIONS
IMPREGNATED FERTILIZER FOR
FORESTRY
• If fertilizer materials are excessively dusty, use a suitable
additive to reduce dust prior to impregnation. Application
of dusty fertilizer which has been impregnated may result
in off-target drift and injury to desirable vegetation. Such
drift and associated injury may be aggravated by high
wind conditions.
• The dry fertilizer must be properly impregnated and
uniformly applied to avoid pine injury/mortality and poor
weed and brush control.
• Uniform and precise application of the impregnated
fertilizer is essential for satisfactory weed and brush
control and to minimize pine injury. Overlaps or skips
between adjoining swaths or non-uniform distribution of
impregnated fertilizer within the swath will deliver poor
results and may result in pine injury or mortality.
• Do not impregnate potassium nitrate, sodium nitrate or
triple super phosphate fertilizers with VELPAR® DF as
herbicidal action will be lost.
USE PRECAUTIONS
FORESTRY
• Do not use VELPAR® DF in nurseries, seedbeds, or
ornamental plantings.
• On tracts of land where various soil types are present and
VELPAR® DF rate selection is difficult, conifer damage
or less-than-expected vegetation suppression may occur
due to the different rates required for various soil types.
•Poor weed and brush control may result from the
following:
–Heavy duff or slash present at time of application
–Use on poorly drained sites
–Applications made when the soil is saturated with water
and rain is imminent within 24 hours
–Applications to soils high in organic matter (greater
than 5%)
• Following harvest, allow stumps and injured trees
sufficient time to adequately resprout before applying
VELPAR® DF.
• Where burning is desired, burn vegetation after any brush
has completely defoliated, at least twice, allowing for
sufficient root uptake of VELPAR® DF.
• Do not use VELPAR® DF on frozen soils; use in spring
after snow melt.
• Do not add a surfactant in applications over the top of
conifers.
•Weed control results from spring applications depend on
sufficient moisture to activate VELPAR® DF.
• When applying VELPAR® DF after transplanting, wait
until rainfall has settled the soil around the base and root
systems of the transplants before making the treatment.
• Crop injury may occur when VELPAR® DF is used:
–On trees that show poor vigor, insect damage, disease,
winter injury, or other stress conditions
–On any soil containing less than 1% organic matter
–On loamy sand or sandy loam with less than 2% organic
matter, except Jeffrey pine and Ponderosa pine
–On conifer foliage after conifer bud break
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