Introduction
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Simazine is
a herbicide of
the triazine class.
The compound is used to control broad-leaved weeds and annual grasses.
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It is available in the formulations of
wettable powder, water dispersible
granule, liquid, and granular.
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Trade names are Princep, Aquazine (58)
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Simazine is
moderately soluble (3,5 mg/L) and has a low tendency to be absorbed
to organic matter or into the soil, although it can adsorb to clay
particles.
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Therefore Simazine highly mobile and can leach into ground water systems.
Uses
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Simazine is used as a pre-emergence
herbicide used for control of broad-leaved and grassy weeds on a
variety of deep-rooted crops such as artichokes, asparagus, berry
crops, broad beans, citrus, etc., and on non-crop areas such as farm
ponds and fish hatcheries.
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Its major use is on corn where it is
often combined with AAtrex. Other herbicides with which simazine is
combined include: paraquat, on apples, peaches; Roundup or Oust for
noncrop use; Surflan on Christmas trees; Dual on corn and
ornamentals.
Report
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Relative to atrazine and metolachlor, simazine is used on a wider
variety of crops—including corn (about 40 percent of total use),
citrus orchards (about 35 percent), and other orchards and vineyards
(about 20 percent).
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Simazine was generally detected more frequently than atrazine and
metolachlor in Florida and California, which is consistent with its
higher use in orchards and vineyards in those areas.
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The
simazine-degradate and aldicarb degradate concentrations were
generally highest and most variable at sites with shallow water
tables and from shorter sampled zones (10-ft-long screened
intervals) near the water-table interface.
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In three
studies in rats, no teratogenic effects were noted at levels below
those that produced maternal toxicity.
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No adverse
reproductive effects were observed in a three-generation study in
albino Charles River rats receiving 50 or 100 ppm simazine in the
diet.
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No simazine
residues were found in corn grain or pinto bean pods, while trace
amounts were found in pinto bean foliage and cucumbers.
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