Magnesium Sulphate

[DrWazzock]

I apply 100 kg /ha of kieserite to all cereals and grass and 150kg to the beet and OSR. I tend to have lowish Mg indices. The sulphate supplies all my sulphate needs, so no need to buy ammonium sulphate.

It's all on now. I am sure it helps.

I also apply mag lime every fourth liming. It's easy to overlook Mg.

Never seen much response to spraying it on as with potash. You will never get enough on spraying it. It isn't really a trace element like Mn.

 

[Little squeak]

NRM, Lancrop

thanks for that I don't use MG but do spray up to 4 times with MnSO4 after using treated seed and then it's STILL deficient

 

[robbie]

Can’t you build your Mg indices at all? We have a bit by using kieserite with all PK applications. We would be 1-2 Mg mostly

That's what's coming next I think. The one block we have that needs p aswell as K gets 0.22.22+11mgo and that's slowly coming up.
I really like polysulphate and that does have a smallish amount of mag which helps but I think maybe every other year I'll use kiesterite instead to build it up.

Anyone got any prices for kiesterite to compare against polysulphate.

NRM or Lancrop which is owned by yara are both good. This year I think I'm going to try omex sap analysis to see how I get in with that.

 

[Chalky]

Chemically the soils are 1 & 2 for Mg, but it does not seem to matter because the test ignores the fact that they are Ca based, and this reduces the availability of Mg. For example, our beet should only need 50kg/ha Mg, but we put on 100 kg/ha as what 'should' do, just does not. Yields increased markedly. We use sulphate as a foliar, but I built a mixer bowser to back up the sprayer a number of years ago because of the complexity of a lot of the combinables micronutrient requirements- plus an obvious efficiency increase. I have personally humped wagon loads of Mg & K into that thing!

 

[phil]

Chemically the soils are 1 & 2 for Mg, but it does not seem to matter because the test ignores the fact that they are Ca based, and this reduces the availability of Mg. For example, our beet should only need 50kg/ha Mg, but we put on 100 kg/ha as what 'should' do, just does not. Yields increased markedly. We use sulphate as a foliar, but I built a mixer bowser to back up the sprayer a number of years ago because of the complexity of a lot of the combinables micronutrient requirements- plus an obvious efficiency increase. I have personally humped wagon loads of Mg & K into that thing!

Do you see benefits from foliar K
If leaf analysis is not showing to be short and soil indices are high would you use it?
How are your soils?

 

[Clive]

Bittersaltz Epsotop with every fungicide application

induction hopper takes it as fast as you can open the bags

 

[Clive]

Do you see benefits from foliar K
If leaf analysis is not showing to be short and soil indices are high would you use it?
How are your soils?

we also use Yara Krista with each fungicide - I did some tramline trails a year or so back and proved a benefit that made it a staple addition ever since - soil indices 2's and 3's

 

[phil]

Bittersaltz Epsotop with every fungicide application

induction hopper takes it as fast as you can open the bags

What application rate
How many times ?

Beginning to wonder is a 12% mag sul liquid is really only melted Epsom salts and not really using enough or often enough
I can get Epsom salts and will try few ton, was always trying to reduce time to fill sprayer eg liquids etc

 

[phil]

we also use Yara Krista with each fungicide - I did some tramline trails a year or so back and proved a benefit that made it a staple addition ever since - soil indices 2's and 3's

Soils here are index 3 and 4 and rarely see it deficient in the leaf. It’s not recommended to mix foliar k and MgSo4 and it can react
I have done it but your basically agitating whole way to field and get rid of tank quick
Magnesium and boron are the main limiting factors

 

[phil]

 

[Chalky]

Mg sulphate and K sulphate dont react. The problem is that for all both are soluble, K is nowhere near as soluble as Mg. Looked into partial solution capacities of both before I tried it-if adding 5kg of each and agchem-130l/ha is just going to hold everything in solution before some of the K refuses to dissolve.

If you know anybody in hydroponics-the product you want is Di potassium phosphate-packed with goodies and dissolves in a mist!

The nutrition game is made easy for manufacturers because they only have to state the K2O etc equivalents of anything-NOT the compound used. Lots of carbonates, sulphates, nitrates that can be sourced as solids by growers. Google Haifa-Israeli solution feed suppliers as solids. Not sure how to get it in UK though.

 

[jonnyjon]

Was wondering if I could melt keiserite for foliar application, would be much cheaper that epso top ???

 

[Brisel]

thanks for that I don't use MG but do spray up to 4 times with MnSO4 after using treated seed and then it's STILL deficient

What is your soil type? Sand? High organic matter black fen? A set of rolls before the end of tillering will help, plus increasing the dose rate.

 

[marco]

Was wondering if I could melt keiserite for foliar application, would be much cheaper that epso top ???

i did a bucket test and it set solid in a few minutes.

 

[Sandy]

Was wondering if I could melt keiserite for foliar application, would be much cheaper that epso top ???

10kg/ha costs us £3.60/ha for Epso top

 

[ollie989898]

Copper and boron on those hungry chalks.

 

[Clive]

10kg/ha costs us £3.60/ha for Epso top

25kg bags £7.30 on TFF Farm Marketplace if bought by the pallet (40 bags)

 

[Bogweevil]

Mg sulphate and K sulphate dont react. The problem is that for all both are soluble, K is nowhere near as soluble as Mg. Looked into partial solution capacities of both before I tried it-if adding 5kg of each and agchem-130l/ha is just going to hold everything in solution before some of the K refuses to dissolve.

If you know anybody in hydroponics-the product you want is Di potassium phosphate-packed with goodies and dissolves in a mist!

The nutrition game is made easy for manufacturers because they only have to state the K2O etc equivalents of anything-NOT the compound used. Lots of carbonates, sulphates, nitrates that can be sourced as solids by growers. Google Haifa-Israeli solution feed suppliers as solids. Not sure how to get it in UK though.

Generic Potassium sulphate - right little bleeder for dissolving even in hot water but this is much better: https://www.yara.co.uk/crop-nutrition/fertiliser/soluble/yaratera-krista-sop/ Then there is this https://be.solufeed.com/products/water-solubles/solupotasse I have not used it though so cannot comment.

I don't know how they make it so soluble.

Di potassium phosphate - expensive!

 

[Chalky]

It was Yara Krista SOP. You cannot change the fact of solubility limits. The more soluble-the more easily into solution & the faster it is.

Nearly all foliar K products are (ridiculously) pricey when pre-formulated. The are more often than not nitrate or carbonate-a liquid sulphate is so weak, hence using solids. There are oddbods like acetate, again all available as solids-just sourcing. Some Omex runway deicer is oddly enough potassium acetate.

The expensive compounds are the ones that lend themselves to being easily dissolved & put in a can with a decent concentration analysis. Apart from nitrate(which may be controlled to a degree as an oxidising agent) most are all available freely through europe in 25kg bags for fertigation systems.Potassium phosphite also-your phorce/nutriphye/advance 66 active ingredient. Maybe some bright spark knows how to get them to the UK-I have asked our distributor but met blank faces.

 

[Bogweevil]

It was Yara Krista SOP. You cannot change the fact of solubility limits. The more soluble-...or fertigation systems.Potassium phosphite also-your phorce/nutriphye/advance 66 active ingredient. Maybe some bright spark knows how to get them to the UK-I have asked our distributor but met blank faces.

I have found soluble K2SO4 to be very easy to dissolve but of course you cannot get more than 111 g/L at 20C, less in cool conditions and if there is KNO3 or any other potassium salt in the mix that will reduce its solubility further.

I don't think phosphite (as opposed to the very different phosphate) is much use as a fertiliser although a useful, well I am not sure if it is a fungicide, an elicitor or what? Now some bright spark has put it in approved professional orchard/vineyard fungicides (Delan Pro & Alginure Bio Schutz) mrls apply and I suppose it comes under pesticide regulations although this is not yet enforced apparently.

I was told that the forestry people approached the manufacturers of phosphite to try and get a price reduction so they could use it in larch woods to control Ramorum blight, but to no avail.

Mono Potassium phosphate may help: https://www.fargro.co.uk/products/id-1155.html about £35 per bag from memory.