Liquid fert calculations

Location
West Wales
All a bit new to me and I’m getting very confused with it. We’ve always applied in units and acre and worked up from there to the product required per hectare. This is our first year on liquid so want to make sure it’s right.
I’ve been sent the following chart so just want to make doublely surely


so for easy maths I wish to apply 100 units of n an acre for which I need to set the sprayer for 410lha


does this mean that I will then be applying
410l / 2.471 = 165.92l of fert per acre to apply 100units of n per acre?

can IT then be worked back further to make it simpler to say that I need for example 5l of product per unit of n applied?
A502285F-2940-44F9-A8F4-544E2A1E47F4.jpeg
 

Cjm

Member
Location
Buckinghamshire
You were right to start with but wrong in the last paragraph.
As that product is sold weight for weight, they have used the sg figure at the bottom to arrive at volume. If you find it easier to think in units/acre just use the chart. If it helps 410 litres to give 100 units/ac is the same as saying 4.1litres for every unit
 
Location
West Wales
Still managed to get myself in knots here trying to work out a price comparison.
so current price on that product is
£530 a tonne = £0.6731perL
We say we need to apply 4.1l to achieve 1 unit of N so £2.69 per unit of applied nitrogen?

On a solid basis stock booster 25n 5s is £560 per tonne
£560/20= £28
£28/25 = £1.12 per unit of N

im going wrong somewhere because I managed on paper to make the diff much closer I just can’t get my head around it.

Using units an acre because we’re in livestock country down here and that’s how all my customers want the pricing done and how I’ve always done it. Not helpful now we’ve transitioned to liquid.
 

e3120

Member
Mixed Farmer
Location
Northumberland
Still managed to get myself in knots here trying to work out a price comparison.
so current price on that product is
£530 a tonne = £0.6731perL
We say we need to apply 4.1l to achieve 1 unit of N so £2.69 per unit of applied nitrogen?

On a solid basis stock booster 25n 5s is £560 per tonne
£560/20= £28
£28/25 = £1.12 per unit of N

im going wrong somewhere because I managed on paper to make the diff much closer I just can’t get my head around it.

Using units an acre because we’re in livestock country down here and that’s how all my customers want the pricing done and how I’ve always done it. Not helpful now we’ve transitioned to liquid.
I sympathise as I am also a livestock farmer who works in a hybrid of u/ac and l/Ha. I should know better.

I've bolded where I reckon you've gone awry. It's 4.1l/Ha to give a unit to the acre so 1.65l for a unit. This will put the solid and liquid costings back in the same ballpark.
 
Location
West Wales
I sympathise as I am also a livestock farmer who works in a hybrid of u/ac and l/Ha. I should know better.

I've bolded where I reckon you've gone awry. It's 4.1l/Ha to give a unit to the acre so 1.65l for a unit. This will put the solid and liquid costings back in the same ballpark.
That makes sense because I was attempting to equate two different things ie area and value. Much appreciated. Must find an easier way to do this I think.
 

Dockers

Member
Location
Hampshire
Stop thinking units, liquid is litres. Kg's /ha, far easier.
You'll be talking pints and gallons per acre in a minute !!!
Just trust the chart if you need confidence.
 

Flatlander

Member
Arable Farmer
Location
Lorette Manitoba
Find out how much N is in a litre and just do the math. I’m an acre person myself as all my fields are mapped out in acres but it’s just numbers. If your sprayer is in litres and fields in acres go with that. Better than f ing up trying to use another man’s system.
 

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