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Pasture Improvement Initiative

Pre-harvest application of a high-performance glyphosate offers multiple benefits for hay and silage producers

With the silage and hay-making season just around the corner, producers could capture a range of the benefits by applying a specialty formulation of glyphosate, which contains two different glyphosate salts*. When combined the salts deliver high-performance weed control and can improve fodder quality.

The glyphosate can be applied within 1–10 days before cutting. The benefits of this technique include:

  • reducing weed-seed set for the following pasture or crop
  • controlling hay or silage re-growth before establishing a new pasture or crop
  • preserving soil moisture for following pastures or crops
  • reducing the interval between sowing summer crops
  • maintaining or improving hay or silage quality.

Left: Untreated control  Right: Weedmaster DST @ 1.4L/ha applied three days before cutting (Wintaroo Oats, Rupanyup, Victoria, 2012) Photo supplied by Nufarm

Left: Untreated control Right: Weedmaster DST @ 1.4L/ha applied three days before cutting (Wintaroo Oats, Rupanyup, Victoria, 2012) Photo supplied by Nufarm

Producers can apply the product in annual pasture crops including oats, wheat, triticale, barley, annual ryegrass and other annual forage grasses cut for hay or silage use.

Application timing

To reduce weed-seed set, control hay or silage re-growth or manage hay quality, apply to mature standing pasture or crop within 1–10 days prior to cutting or mowing.

The company who developed the dual-salt glyphosate, Nufarm, have shown in their trials that best results are obtained from using an application rate of 2.8 – 4.1 L/ha. The higher rates allow for faster desiccation and improved efficacy in dense or lodged crops. Higher rates are also recommended if cutting is to occur within three days of application.

For dense hay and silage crops or for harder to control weeds, spray the crop or pasture earlier, rather than later, to allow the product to fully translocate into the plant.

For crop quality improvements, spray 3–5 days before cutting.

A colour change will occur at 4–7 days following spraying, however quality will remain unaffected.

Nufarm advises export hay producers to apply the dual-salt glyphosate to pastures and crops no earlier than three days before cutting in order to retain colour.

Rates and water volume

Effective spray coverage is essential for best results.

Water volume: apply dual-salt glyphosate with a minimum water volume of 70L/ha at a coarse to very coarse spray quality. For dense or lodged crops, aim for a water rate of 110-120 L/ha.

Boom height: Ensure the spray boom is 50cm above the crop to achieve a double overlap for increased coverage.

Adjuvant: If applying product at lower rates (less than 2.8 L/ha), use LI 700, which helps with faster desiccation and droplet management. Dual-salt glyphosate is also covered by a one hour commercial rainfast offer when applied with LI 700.*

Also consider using Wetter TX if you are looking to control annual ryegrass. Wetter TX is a non-ionic surfactant, which assists the movement of dual-salt glyphosate into ryegrass under spring phasic growth conditions.

Always read the product label prior to use and adhere to any plant-back or withholding periods outlined.

* weedmaster DST, containing dual salts of glyphosate is the only glyphosate product registered for application prior to cutting in hay and silage crops to control annual weeds, reduce weed seed set and re-growth and preserve soil moisture for summer crops. Combined with a tailored surfactant package, this ‘dual-salt technology’ is a unique combination of two salts and innovative surfactant technology to form advanced glyphosate products with improved performance compared to single-salt products It allows for a higher active loading and accelerates plant uptake because the glyphosate passes through the cuticle into the plant sap transport system more quickly. This formulation also delivers optimal efficacy in a range of conditions including excellent stability at low temperatures, mixing in hard water and compatibility with other tank mix partners.