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Flowable Atrazine 500 Product Details

Flowable Atrazine

Residual herbicide for the control of certain broadleaf weeds and seedling grasses in maize, sweetcorn, linseed and established lucerne.

  • Highly effective herbicide for pre-emergence or post-emergence broadleaf weed control. Weeds controlled include fathen*, black nightshade, willow weed, amaranth spp. and Apple of Peru.

  • Ideal for tank mixing with Roustabout.

  • Suitable for sprayers that require a liquid formulation.

Active Ingredient:


Pack Size:

500g/L Atrazine
Suspension concentrate


Flowable Atrazine 500 is absorbed through leaves and roots and acts best on young weeds as a post-emergence spray. It should be evenly applied to smooth clod-free soil. Moisture in the soil surface is essential for good results. Avoid spray overlaps.

Maize and Sweetcorn

Apply as an early post-emergence spray (within 7 days of sowing). It is important that weeds are actively growing in moist soil and not more than 2cm in height. Do not apply under dry slow-growth conditions. Application may safely be made at any growth stage of the crop. Shallow moulding to a depth of 3cm, 7 to 10 days after spraying can improve weed control where soil moisture is low.

Application rate per wetted hectare


For broadleaf weeds use 1.5-3.0 litres
Apply in 200 to 400 litres water per hectare as a directed band spray or as an overall spray. Weeds controlled include fathen, black nightshade, willow weed, amaranth spp., and Apple of Peru. The addition of Contact Xcel wetting agent is recommended. Alternatively use 1-1.5 litres/ha with 150-200ml/ha Primiera® + Bonza® at 1% of spray mixture.
For broadleaf weeds and annual grasses use 1.5-3.0 litres + suitable grass herbicide (e.g. Roustabout®)
Apply in 200 to 400 litres water per hectare with a recommended grass herbicide at the appropriate rate. Apply as a directed band spray or as an overall spray. The addition of Contact™ Xcel wetting agent is recommended.


Application rate per wetted hectare


Use 800ml
Recommended as an addition to 750ml Agritone® 750 per hectare where spurrey, cornbind, willow weed and fumitory are problem weeds. Apply in 150 to 250 litres of water per hectare when the crop has 2 true leaves but is not more than 6cm high. Ideally, the weeds should not be beyond the 2 true leaf stage.
Flowable Atrazine 500 may cause initial crop suppression but the crop normally recovers and yield is not affected. Do not exceed the recommended rate and avoid spray overlap as severe crop damage may occur.


Application rate per wetted hectare


1.5-2.0 litres + suitable post-emergence herbicide
A mixture of this rate with 2.5-3.0 litres paraquat 20% ai in 200 to 300 litres water per hectare controls annual grass weeds, seedling shepherd’s purse, subterranean clover and storksbill.
The higher rate of Flowable Atrazine 500 should only be used where seedling storksbill is a dominant weed. Apply to closely grazed stands during the winter months when lucerne is completely dormant. Do NOT apply when frost is still on the ground or when ground conditions are excessively wet. Allow a few days after grazing for weed growth to freshen before spraying. Application should not be made to lucerne stands less than one year old.

Mixing and Compatibility

Add the required quantity of Flowable Atrazine 500 to water in the spray tank and agitate. Continue agitation during application. If mixing with other herbicides, add the concentrates to the water in the spray tank one at a time. Add wetting agent last to minimise frothing.

Flowable Atrazine 500 is compatible with most commonly used herbicides. It is not compatible with Gramoxone® 250.

Crop Rotation

Because residues resulting from the use of Flowable Atrazine 500 can adversely affect certain susceptible crops such as tomatoes, cucurbits, brassicas, lettuce, beetroot and beans, do NOT plant crops other than maize and sweetcorn after applying Flowable Atrazine 500 unless the area has been ploughed and cross-cultivated thoroughly and it is certain that there are no residues remaining – this can be confirmed by use of an indicator crop, e.g. radishes.

Further Information

See the Product Information section for the product label or call 0800 NUFARM (683 276)