Slurry analysis

[upnortheast]

Just had this back
Assume MOP @ £400 tonne & TSP @ £400 tonne
N @ £400 or N @ £800

Think the values / 1000 gal are between £25 - £40

Need to allow for losses
Anyone any better at sums


?

 

[Bald Rick]

It’s not about totals unfortunately but availability

off the top of my head, I cannot remember the figures but they are all in RB209 which you can view online.
P is relatively immobile
K is cyclical
N availability will depend on weather at application

 

[Luke Cropwalker]

Just had this back
Assume MOP @ £400 tonne & TSP @ £400 tonne
N @ £400 or N @ £800

Think the values / 1000 gal are between £25 - £40

Need to allow for losses
Anyone any better at sums


?View attachment 1026928



View attachment 1026928

To be accurate you really need a figure for available N and even then the crop and time of year when applied will affect how efficient the N is utilised. The correct analysis code at Lancrop is SA7d.

 

[ollie989898]

Availability is key and will vary according to the crop, soil type and time of years as others have said. The potash from memory is likely to be 90%. The availability of phosphate in slurry tends to be low, which explains why maize crops usually show a response to phosphate fertiliser despite big repeated doses of slurry.

 

[vantage]

To be accurate you really need a figure for available N and even then the crop and time of year when applied will affect how efficient the N is utilised. The correct analysis code at Lancrop is SA7d.

Availability is key and will vary according to the crop, soil type and time of years as others have said. The potash from memory is likely to be 90%. The availability of phosphate in slurry tends to be low, which explains why maize crops usually show a response to phosphate fertiliser despite big repeated doses of slurry.

But availability from manufactured N will always be 100%!

 

[ollie989898]

But availability from manufactured N will always be 100%!

There are lab values for the availability of AN and the like applied to soils but I can't remember them whatsoever.

 

[Luke Cropwalker]

But availability from manufactured N will always be 100%!

Its quoted as being relative to manufactured N, I actually use the figures a lot and they work for me.

 

[ridger]

How much n does maize actually need?

 

[upnortheast]

I was trying to get a value on it. Reason is off farm is 3 miles away. Is it better value to haul slurry up there or use bag fert

 

[coomoo]

I was trying to get a value on it. Reason is off farm is 3 miles away. Is it better value to haul slurry up there or use bag fert

Which way are you thinking?

 

[Sid]

But availability from manufactured N will always be 100%!

Doesn't urea volitise?

 

[upnortheast]

Looking at RB209 our slurry appears to be similar to the "standard" figures they use.
For spring appliacion of 30cu m / ha - 2700 gall / acre they suggest a saving over bought fert of £83 / ha £33 / acre.
The calc is based on N @ 60p kg. P @ 60p kg . k @ 60p kg (last years numbers ? )
Our av N cost for this year is £450 so + 50% P & K about the same

So the savings become £125 / ha £50 / acre
Lets say tanker is £50 / hour. 3 miles away so he does 2 loads / hour So 2 acres hour
Net saving becomes £60 ha £25 acre
Havn`t taken into account cost of not spreading bag fert Maybe £5 / acre ?
Unless anyone has a different calc ?

 

[ollie989898]

I was trying to get a value on it. Reason is off farm is 3 miles away. Is it better value to haul slurry up there or use bag fert

Get a quote from a contractor to haul your total volume of slurry that distance and spread it.

 

[frederick]

I was trying to get a value on it. Reason is off farm is 3 miles away. Is it better value to haul slurry up there or use bag fert

It will always be better value used as close to home as possible as long as those fields can make use of it.

 

[ollie989898]

It will always be better value used as close to home as possible as long as those fields can make use of it.

Although in reality the fields closest to the store/unit are invariably the ones with P and K indices of 4 or 5. The fields 3 miles down the road could probably do with it.

 

[Keep On]

It’s got to be spread at some point as well don’t forget.

 

[ridger]

I was trying to get a value on it. Reason is off farm is 3 miles away. Is it better value to haul slurry up there or use bag fert

3 miles is beside home around here, my cut off is 7 miles

 

[crashbox]

I had similar question, similar distance, I don't think there will be much of a saving merely looking at NPK values vs contractor bills/diesel >£1/litre... but when you consider other "harder to quantify" benefits (Sulphur? Humus? Organic matter? Farming Rules for Water?) it makes sense.
Good luck with it.

 

[crashbox]

Oh but then there's the flip side, put slurry on at the wrong time you can bugger up your silage, if it's wet extra compaction, and when the store is full it's got to come out...

Not an easy one. But I am making serious attempts to share slurry and FYM around the remotw ground better.

 

[DaveGrohl]

Oh but then there's the flip side, put slurry on at the wrong time you can bugger up your silage, if it's wet extra compaction, and when the store is full it's got to come out...

Not an easy one. But I am making serious attempts to share slurry and FYM around the remotw ground better.

Indeed, my rule of thumb is that the fields furthest away prob are more in need of the OM as well as the nutrients in slurry. Further away tend to be cropped, nearer home tend to be grazed.