QUESTION: What rate would you recommend for spraying Decision through a handgun – can you give me a rate per 60 litres?
It’s not as simple as it sounds.
Decision is normally applied only as an area spray, with a boom or roster sprayer. So the rate is based on amount of product per unit of area. That is, for example, 50g per hectare.
It’s difficult to give a rate per unit of water for handgun spraying, unless 1 know for how much area is covered by that operator using that handgun with each 100L of water. Did Malcolm say how much area he would spray with 100L water? Or with however many litres of water his handgun spray tank holds?
It becomes even worse when I say that Decision has three different application rates, based on the identity of the target species.
So the highest rate is more than double the lowest rate. So to be of help we really need to know the weed you are spraying?
Let’s make some assumptions:
So based on these assumption
The per hectare rate for annual buttercups is 50g of Decision, but you are going to spray just a quarter hectare with your 60L handgun tank.
So you need 50g/4 = 12.5g of Decision in 60L of water.
Note: If ANY of these assumptions is wrong, then 12.5g Decision per 60L of water will be incorrect.
Not quite as simple as it sounds.