Cultan ?

[Clive]

Who (if anyone) is still doing this in the UK ? I looked at it in some detail a few years ago and it made absolute sense (and that was when N was cheap !). logistically it was a nightmare however

Who are the experts on this to speak with ? It should be a no brainer at current N price levels surely ?

 

[Dockers]

I think Niab Tag have some info, if you are a member ?!

 

[YELROM]

What happened to knockie

 

[Chae1]

What happened to knockie

Depends if you believe rumours.

I was told it did something pretty drastic to ph levels. But would add just hearsay.

Haven't spoken to him for a long time. I heard he was unwell.

Was going to buy some tyre's off me for his land rover. But never heard from him again

 

[PSQ]

I was told it did something pretty drastic to ph levels.

That's the issue with Ammonium Sulphate (used in Cultan), it's highly acidic, and was always said to neutralise it's own weight in lime £££.
Funnily enough I've got about 5kg of ag lime beside me in the office to test that hypothesis, and about 90t of AS in the shed. I just need a pH meter.

 

[Clive]

do you have to use AS ? could you simply use the spoked injection method with urea to eliminate volatilisation which increases efficiency by 50% plus ?

 

[cquick]

I thought the reason it stayed in place was the high concentration of AS sterilised that portion of soil, halting degradation/leaching? Not sure that would happen with Urea?

 

[SilliamWhale]

I think Andrew Manfield - Manterra did a bit with it.

The amounts of ammonium sulphate never appealed to me, my pH always wants to go down

 

[Clive]

I thought the reason it stayed in place was the high concentration of AS sterilised that portion of soil, halting degradation/leaching? Not sure that would happen with Urea?

yes I think you are right but surely injection of any fertiliser is more efficient than broadcast ?

Crops like potatoes placement is common ?

 

[SilliamWhale]

yes I think you are right but surely injection of any fertiliser is more efficient than broadcast ?

Crops like potatoes placement is common ?

Is placement more efficient for spuds though?
Why is placement more efficient anyway

 

[Clive]

Is placement more efficient for spuds though?
Why is placement more efficient anyway

i guess you loose the volatilisation ?

 

[ajd132]

i guess you loose the volatilisation ?

Shouldn’t really get volatilisation if using urea correctly in the uk

 

[Chalky]

The late great Emsted sent me some German work on it from the 70's/80's looking at the script. Was on here in messages-or a former version!! Not on it now unfortunately. If a moderator chooses to look and can retrieve it, I would be more than happy to share..

Logistics are the killer and very specialised kit-poor workrates. The science is sound, and as mentioned works a little like anhydrous ammonia injection or Didin in that it incapacitates/kills soil bacteria that leads to denitrification-so with that being the new 'thing' I can't imagine the great and the good would be looking at it...

There was a difference however with AS over the 'sterilising' approach, but I cannot for the life of me remember it. Believe it liberates soil phosphate for one thing.

 

[SilliamWhale]

i guess you loose the volatilisation ?

But is AN more efficient than urea?

 

[Brisel]

But is AN more efficient than urea?

No. I’m not currently a NIAB TAG member, so can’t show this, but older multi year replicated trials for AN vs urea in a typical winter wheat programme showed no yield loss for the same kg of N used. A slightly lower grain protein with urea, that’s all.

 

[pipestretcher]

I think Andrew Manfield - Manterra did a bit with it.

The amounts of ammonium sulphate never appealed to me, my pH always wants to go down

 

[Secret Agronomist]

Is placement more efficient for spuds though?
Why is placement more efficient anyway

More efficient for spuds as they don't have such a good root system or something, iirc