Ultra Low Volume application - for example where silage additive is applied at 20ml/tonne of grass compared to the usual 1-2 litres/tonne - could save considerable time at harvest.
Ultra Low Volume (ULV) silage additive application could decrease the hassle factor associated with lugging copious amounts of water to the field and reduce tractor down-time at silage-making.
All too often, keeping the forager topped up with silage additive can be a full-time job on traditional systems where additive is applied at 1-2 litres per tonne.
It can mean lugging IBCs of water to the field or bringing the forager back to the farm to top it up at the hose.
ULV application allows the dilution rate to be reduced considerably – so for example additive is applied at 20ml/t.
The same amount of additive or ‘silage bugs’ are applied so the product cost stays the same.
All that changes is the volume of water added, explains Volac’s Peter Smith.
“All we need to do is get the bugs on to the grass. The amount of water is irrelevant. It’s merely a carrier for the product,” he says
Not all additives can be used at ULV (see key considerations box), but most large manufacturers will have a product which can be applied this way.
The forage harvester will also have to be set up for ULV using a specialist applicator, which can be retrofitted to most machines.
The ULV applicator allows the additive to be atomized, a bit like car paint spray, using the high wind speed in the chute of the forager.
In comparison, the traditional method uses droplet application.
With ULV, 20 litres of mixed Ecosyl will treat the same amount as 1,000 litres applied using the traditional method.
Peter Smith (pictured) says that ultimately ULV reduces the amount of time silage trailer tractor drivers have to wait for tanks to be topped up.
With drivers typically being paid by the hour, this down-time soon adds up.
It also means more acres can be harvested in a day, which can be a god-send in ‘catchy’ weather.
"If you can remove the hassle out of any process, it is more likely to be done correctly"
Only use additives that say they can be used for ULV on the label. Additives for ULV application need to be buffered correctly so they do not kill themselves once mixed. They also need to be held in suspension once mixed
The forager requires a specific ULV applicator
ULV will only work through large forage harvesters as a high wind speed is needed up through the chute to atomise the additive
“With traditional application, if you are applying at one-litre a tonne in a 400-litre tank, they will need to stop [on a 7t crop] every 57 acres or every 28 acres with a 200-litre tank,” says Mr Smith.
Some contractors have told Mr Smith that less time needed to fill tanks is worth about 4-6 hectares (10-15 acres) a day, which is hugely valuable when they are getting paid by the acre.
For farmers, it frees up time to do other jobs during silage-making.
The fact the silage additive job is easier in the field also means they can have increased confidence it is getting done right.
“If you can remove the hassle out of any process, it is more likely to be done correctly,” Mr Smith adds.
The effectiveness of application is also consistent between methods.
Ten trials carried out in the UK and Germany looked at the different application methods using Ecosyl.
It was applied at 20ml/tonne or 1.5 litres a tonne.
“The evenness of spread of bugs through the crops was if anything slightly better using Ultra Low Volume,” says Mr Smith.
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