Sulphate of potash

Thedual1

Member
Ah yes I've seen that before. What was it in?

AN bad for the soil then? TSP good?

I have another table of pH for types of fertiliser, may change your mind and mine on SOP, I know that a few grains of SOP round a seed shouldn't affect the pH around the seed, but not sure how high application may acidify the soil and upset soil bacteria, chlorine may be least of our worries. No problem with high pH soils, where this could be beneficial action with a flush of locked up nutrients caused by acidification. Not good for low pH soils where I come from where pH 6.2 is deemed as good !
image.jpg
 
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ajd132

Member
Location
Suffolk
Used lots of fibrophos here it's pretty good and can get it cheap. Using polysulphate in the spring this year because unbalanced potash releasing clays don't release potash!
 

clemmo

Member
I just find it hard to believe there would be that much of a difference, even the gurus arnt always right!!!

I'm not saying he is wrong just an observation
 

Thedual1

Member
Used lots of fibrophos here it's pretty good and can get it cheap. Using polysulphate in the spring this year because unbalanced potash releasing clays don't release potash!
Have you tried gypsum or Calcifert S to open up the clays

What are the levels of the following (ppm from soil analysis)

pH
Calcium
Magnesium
Potash
Sodium
 

Thedual1

Member
Similar to Glenside's, expensive ?

I have created my own copyrighted one which covers all cations, but as I use laser soil texture to determine the soil type. Once determined I can recommend the nutrients to raise the soils CEC for the desired CEC for that soil type.
 

Thedual1

Member
View attachment 266220
I was planning some Calcifert S here,

Calcifert S would be a good option for raising calcium, you will also strip out some of the magnesium with this. I would be looking at applying a good magnesium foliar spray at each spray application as you have high soil magnesium levels, which may not be plant available. A simple test is if you spray foliar magnesium be it liquid or Epsotop to cereal crops on high mag soils they will green up, showing that the soil magnesium is not plant available. Magnesium is a very important nutrient in chlorophyll and photosynthesis and plays a massive part in grain size and weight

Another thing to watch is if you apply high levels of calcium you will antagonise both phosphate and boron, and as such you should be looking at applying both foliar phosphite and foliar boron.

Calcifert S is also high in sulphur which may antagonise the soils copper as such you should back up with foliar copper.

I love soil nutrition it is all about balance, understand Mulder's chart and you will be well on your way to getting soil in balance.
 
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phil

Member
Location
Wexford
That field is not typical of farm , most are nicely balanced
Place an AS/Dap + boron at Spring drilling with added copper will be foliar copper this year, spray foliar Mgk+ during season and have had good results so will continue

My problem at moment is I have K at 5-7% on the base
Is it available? How can I unlock it. Can it be done?
 

Thedual1

Member
No simple chart that shows how nutrients react, doesn't show sulphur, but high sulphur antagonises copper and visa versa.
image.jpg
 
That field is not typical of farm , most are nicely balanced
Place an AS/Dap + boron at Spring drilling with added copper will be foliar copper this year, spray foliar Mgk+ during season and have had good results so will continue

My problem at moment is I have K at 5-7% on the base
Is it available? How can I unlock it. Can it be done?
Presumably you have deficiency in boron, copper and mag too?

What are you typical ph phil?
 

phil

Member
Location
Wexford
Boron and copper will show low everywhere
Mg not so much deficient but starting to fall off now
May need to start using kieserite
Was very high in mg but using high calcium lime has helped along with sulphur
Easy enough to balance
 
Boron and copper will show low everywhere
Mg not so much deficient but starting to fall off now
May need to start using kieserite
Was very high in mg but using high calcium lime has helped along with sulphur
Easy enough to balance
So inherently you'd be high mag, low ph soils? Presumably CEC below 12 or so or mag lime has been a lot cheaper tha ca lime in your area? Why do you think K is so unavailable in a lower ph scenario?
 

phil

Member
Location
Wexford
Mag lime was also spread, ground is shale underlay so mg soil, one hit of Mag lime will drive mg through the roof
Calcium lime only option
Now when needed I will blend small amount of mg lime with calcium
 

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109: Monitor Farm takeover

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109: Monitor Farm takeover

Written by AHDB

The first episode in the Farm Excellence series of the AHDB podcast focuses on cereals & oilseeds. The Monitor Farm programme comprises a network of farmers from across the UK and Northern Ireland committed to driving innovation and best practice. They host regular meetings at their farms in which they discuss issues facing agriculture in their...
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