Cell-Tech®, Optimize®XC, and TagTeam® LCO XC contain
rhizobia, which are living bacterial organisms and can be
harmed by applications of talc and/or graphite. Anything,
including talc and graphite, that dries the seed too quickly
after a wet seed treatment application can cause rhizobia
desiccation, which has the potential to greatly reduce the
amount of on-seed rhizobia colony forming units (cfu).
Any moisture on soybean seeds can cause compounds in
the seed coat to be released and become sticky. This can
include seed treatments, liquid inoculants, water, and
high humidity. To reduce the stickiness or bridging
potential, a common practice is for seed treating
operations to use talc and/or graphite.
A compatibility study by BioAg™ Alliance partner
Novozymes was conducted to determine the affect of
talc when applied to freshly inoculated seed. Talc,
graphite, and blended products have similar drying or
water absorption characteristics. The study utilized talc
application rates of 1 oz and 0.5 oz and demonstrated
that the number of viable rhizobia per seed could be
reduced 70% and 55% respectively when applied to wet
seed at 70° F. When the talc application occurred one
hour after the seed treatment was applied, the impact
was reduced to 35% (Table 1).
The application of talc and/or graphite are compatible
with wet treated seed for up to two weeks if the seed is
kept at ≤ 40° F after treatment and prior to planting. As
the temperature increases, the application time to safely
apply talc and/or graphite diminishes quickly.
The lipo-chitooligosaccharide (LCO) technology molecule
is stable under a wide range of conditions; however,
special care should be exercised when freshly treated
seed containing rhizobia is wet and an application of talc
and/or graphite is desired.
Talc and/or graphite used with dry treated seed at
planting to increase seed flow through planter units can
be used without concern. Seed coatings can get rougher
and stickier when the coatings absorb moisture. Talc has
the ability to smooth the seed surface to help improve
Graphite helps lubricate seed mechanisms to reduce
friction. Static electricity can also cause seeds to stick
together and decrease seed flow. The static electricity
develops from low humidity and seed movement within
the seed units. Graphite and talc can help reduce static
electricity and improve seed flow through the units.1
1Anderson, D. Talc and graphite: What you need to know before you plant.
www.agweb.com. Web source verified 3/28/16. 160309100844
Developed in partnership with Technology, Development & Agronomy by Monsanto. Monsanto and Novozymes have teamed up to establish The BioAg Alliance to discover, develop and sell
microbial solutions that enable farmers worldwide to increase crop yields with less input.
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ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS. Acceleron®, Cell-Tech®, Monsanto BioAg & Design™, Optimize® and TagTeam® are registered trademarks of Monsanto Technology LLC. All other trademarks
are the property of their respective owners. ©2016 Monsanto Company. 160309100844 04012016LGM