Spraying set ups

mountfarm · May 12, 2019

From previous posts we are thinking of downsizing our sprayer which will effectively mean more work due to a smaller tank size. We will be loosing 1500l of capacity which with root crops means 7.5ha per load. More filling, more road work etc.
So I’m just wondering about how we are spraying which generally is 200l of water at 2.5bar pressure mainly through fan jets. Crops are combinables, pots, onions and carrots with a bit of grass. Speed varies with the terrain so slower in roots at 10km/hr up to 14km/hr in combinables.
I’ve seen a few posts on twitter of people operating at lower water volumes of 125l/ha for combinables but at 3.5 bar pressure?

What’s right?

Hereward · May 12, 2019

3 bar, 100 l/ha, 12k, guardian air nozzles.

B'o'B · May 12, 2019

As @Hereward in cereals 95% of the time there is no advantage going over 100L/Ha. It looks like he and I are both using 025 GuardianAir nozzles. On fungicide I will use the same nozzles and if conditions are good I’ll speed up 14-15kmh and be at around 4bar pressure. If I have herbicide in the tank I normally stick around 12kph.

teslacoils · May 12, 2019

100 Lt. Flat fans or guardian airs. 1.5 bar. 10kmphr.

Chae1 · May 12, 2019

teslacoils said:
100 Lt. Flat fans or guardian airs. 1.5 bar. 10kmphr.

Do you not get a very coarse spray pattern at such low pressure?

At what pressure do anti drip valves open?

B'o'B · May 12, 2019

Chae1 said:
Do you not get a very coarse spray pattern at such low pressure?

At what pressure do anti drip valves open?

If you have pneumatic shut-offs the anti drip valves stay open at any pressure when the valve is turned on.
GuardianAir would be LERAP 3* at that pressure, flat fan probably still be borderline fine-medium quality.

teslacoils · May 12, 2019

My air induction will be ok up to 1.1 bar. If I want it finer I'll go slower at higher water. For pre ems I'll do it in the drizzle if possible.

I'll change the speed and pressure before I change nozzles.

Brisel · May 13, 2019

teslacoils said:
My air induction will be ok up to 1.1 bar. If I want it finer I'll go slower at higher water. For pre ems I'll do it in the drizzle if possible.

I'll change the speed and pressure before I change nozzles.

This.

I run 025 at 12 kph 100 l/ha. Angled caps with Bubblejets, 025 Guardian Airs for taller crops & have a set of 025 BFS X rays for low drift work. Where I need finer sprays & good coverage I just increase the water rate - at least if the wind gets up during a tank load I can slow down to make the pattern more coarse.

For 200 l/ha 04 nozzles would be ok at 10 kph

Boysground · May 13, 2019

A few years ago I moved from 025 guardians to 03. I get a lot less blockages. 125l does work well. This year I have done quite a bit with 04 guardians at 150l. I did some spring Atlantis at that rate and didn’t spin them back round. Atlantis has worked exceptionally well I assume I just hit the target more accurately.

Bg

Bobthebuilder · May 13, 2019

Surely you have to spray at least at the higher water volume stated on the label of the chemicals, and quite a few are going back to 200L/ha

John Slejpner · May 13, 2019

B'o'B said:
As @Hereward in cereals 95% of the time there is no advantage going over 100L/Ha. It looks like he and I are both using 025 GuardianAir nozzles. On fungicide I will use the same nozzles and if conditions are good I’ll speed up 14-15kmh and be at around 4bar pressure. If I have herbicide in the tank I normally stick around 12kph.

I use twin capped guardian air 025 for pre-ems and ear protein N, and 'standard set-up' 025 guardian air for just about everything else.

Chae1 · May 13, 2019

Bobthebuilder said:
Surely you have to spray at least at the higher water volume stated on the label of the chemicals, and quite a few are going back to 200L/ha

I'm inbetween, do everything at 150l/ha.

Normally spray about 3 bar though.

Never sprayed below 2 bar.

Bogweevil · May 13, 2019

Bobthebuilder said:
Surely you have to spray at least at the higher water volume stated on the label of the chemicals, and quite a few are going back to 200L/ha

Perhaps I have misunderstood - doesn't it depend on the label - this is what the code of practice says:

“You should not use reduced-volume spraying if the label (or the relevant notice of approval):

bans reduced-volume spraying (for example, if there is a maximum in-use concentration or minimum application volume); or
states that PPE must be worn when the product is at the dilution ready for use; or
has ‘corrosive’’, ‘very toxic’, ‘toxic’ or ‘risk of serious damage to eyes’ on the product label.

In these situations, you may reduce the volume only if you also reduce the dose of product so that the concentration of the spray solution is no greater than that recommended on the product label.”

yellow belly · May 13, 2019

mountfarm said:
From previous posts we are thinking of downsizing our sprayer which will effectively mean more work due to a smaller tank size. We will be loosing 1500l of capacity which with root crops means 7.5ha per load. More filling, more road work etc.
So I’m just wondering about how we are spraying which generally is 200l of water at 2.5bar pressure mainly through fan jets. Crops are combinables, pots, onions and carrots with a bit of grass. Speed varies with the terrain so slower in roots at 10km/hr up to 14km/hr in combinables.
I’ve seen a few posts on twitter of people operating at lower water volumes of 125l/ha for combinables but at 3.5 bar pressure?

What’s right?

is this to save cost

the longevity of a sprayer can be reduced by doing more road work at speed so calculated saving can be negated in practice
timeing is critical with many sprays and delays can cost
more tractor hours on a tractor for the same area covered can be more costly

I have found 100 l /ha enough on combineable crops

if we had to put higher volumes I would cart water to the sprayer by having more fill points with water piped to them

Shropshire Farmer · May 13, 2019

I use lechler 03 idta twins for everything anything from 120-200 l/ha alter forward speed to and pressure according to conditions.

Sprayer 1 · May 14, 2019

I have tried 150lph but much as I try to convince myself it works, the results are not as good as 200lph, especially on board leaves weeds in grassland. We use idkt. Am I the only one that thinks this ?

Chae1 · May 14, 2019

Sprayer 1 said:
I have tried 150lph but much as I try to convince myself it works, the results are not as good as 200lph, especially on board leaves weeds in grassland. We use idkt. Am I the only one that thinks this ?

I do docks at 200l/ha.

Idks

oakleaf · May 14, 2019

Combinable crops 180 to 220 l/ha
Grassland 250 to 300 l/ha. Sometimes even higher (350) for heavy dock infestations.
It helps having a large capacity sprayer on a modest acreage and a plentiful water supply.

Brisel · May 14, 2019

Why the higher water volumes in grassland? Ignoring product labels and the slower forward speeds for a moment, you’re hitting massive targets so as long as the chemical hits the leaf I don’t see the need for so much water.

Edit: I appreciate that contact material does not move within the plant so needs to be a fine spray for maximum droplet numbers & better coverage even of the underside of the leaves. Most grassland herbicides are translocated so this is less important.

robs1 · May 14, 2019

Brisel said:
Why the higher water volumes in grassland? Ignoring product labels and the slower forward speeds for a moment, you’re hitting massive targets so as long as the chemical hits the leaf I don’t see the need for so much water.

Certainly some of them it's due to chem concentrations but for some they do seem to work better, not sure why unless it leads to slower up take and thus gets further into the root system

Spraying set ups

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