Gibberellic Acid GA3

SmartGrass is a sprayable plant growth enhancer that increases dry matter production when cool weather conditions (5-10°C) limit growth. SmartGrass contains gibberellic acid (GA3), a natural plant growth hormone which increases cell size and numbers resulting in increased growth.


Product Video

Key Benefits

  • Speeds up early grass growth in the spring
  • Can produce up to 50% more than the untreated, 21 days after application
  • Ideal for rotational grazing and increasing silage yield
  • Reduces supplementary feeding costs
  • Maximise milk yield from grass
  • Increases profitability

Best Use

SmartGrass can be applied to grass
based pasture at least one year old by conventional ground boom sprayer, either tractor mounted or quad bike for small paddocks. Graze paddocks early spring to a height of 3-5cm (1,500kg DM/ha).

Apply 20g/ha SmartGrass within five daysafter stock removed and graze or cut for silage 21-28 days after application. In areaswhere first cut silage is taken early apply SmartGrass three to five days after the

first cut (before 1 May). Take the extra yield benefit by cutting or grazing 21-28 daysafter application.

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Use It or Lose It!

Ryegrass only ever develops three leaves; when the fourth starts growing, the first dies back.At this point the gibberelin levels will be back to normal so to gain the advantage of the larger leaves produced by SmartGrass, it is important to graze or cut them before they die back - about 28 days after application.

Farmer Trials

Farmer applied and independent trials have shown consistent yield increases ofbetween 500 and 600kg DM/Ha when sprayed within five days of grazing. In one farmertrial, we achieved over 600kg DM/ha in 19 days when SmartGrass was applied. It isimportant to measure the benefit as the extra yield isn’t always easily visible.

Label Information

Maximum Application Rate:20 g/Ha
Maximum Total Dose:20 g/Ha/year
Time Of Application:Spring during March and April
Min Interval Between Applications:n/a
Water Volumes:min 200 L


Grassmanship™ is a programme featuring a portfolio of products that optimise grass production to give farmers more DM/Ha and Return on their investment.

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Nufarm UK have launched Grassmanship™ to provide a flexible and new, integrated approach for better agronomic management of grass crops.