- Location
- Carmarthenshire, West Wales
could do with a bit for a shed floor!
Gypsum on high Mag clay?
- Thread starter Pan mixer
- Start date
- Location
- Darlington
Sounds like what I have to do on my farm.
marco
Member
- Location
- tipperary, ireland
One small note, CA has to be well over 60% before using gypsum otherwise the sulphur in the gypsum will take soil calcium instead of the mg.
- Location
- People's Republic of South Yorkshire
How about high mag due to generation before using go much mag lime...?
- Location
- Darlington
dannewhouse
Member
- Location
- huddersfield
How much per ton was it and where did you get it fromJust put 2.5t/ha of recycled gypsum on here for the first time to counteract Mg indices of 5-6
Keith Mount
www.mountliming.co.uk
Not
% sure on price as yet as not had invoice.
Keith Mount Liming | Agricultural Lime for fields in East Anglia
Keith Mount Liming has been in business for more than 150 years offering Agricultural Lime, Gypsum, P & K Fertilisers and Soil Analysis across East Anglia.
www.mountliming.co.uk
Not
% sure on price as yet as not had invoice.
Last edited:
60% of Ca/Mg ratio???
That sounds completely counterintuitive to say you can’t apply gypsum to high Mg to soil because the Ca level is too low, that’s the entire point of applying gypsum.
Have you got a source for this?
- Location
- Darlington
It's free at point of collection from Agricore (now rebranded but can't remember the new name, sorry)
marco
Member
- Location
- tipperary, ireland
- Location
- Darlington
It's free at point of collection from Agricore (now rebranded but can't remember the new name, sorry
- Location
- America's dairyland
I'll throw this out there: https://www.canr.msu.edu/news/soil_calcium_to_magnesium_ratios_should_not_concern_most_farmers
Typically I hear about Ca/Mg ratio in online adds for liquid snake oil "lime substitute", complete nonsense. Gypsum is used on saline/sodic soils in parts of the Dakotas, Montana etc. I doubt the UK has much of that soil type. The university research above is against using Ca/Mg ratio, but they are measuring yield, not soil physical properties.
Typically I hear about Ca/Mg ratio in online adds for liquid snake oil "lime substitute", complete nonsense. Gypsum is used on saline/sodic soils in parts of the Dakotas, Montana etc. I doubt the UK has much of that soil type. The university research above is against using Ca/Mg ratio, but they are measuring yield, not soil physical properties.
- Location
- Darlington
Ca/Mg ratios may not be the be all and end all, but if high Mg levels are locking Potash up and Ca in the form of Gypsum is changing the ratio and releasing Potash then it's got to have some credibility. I know we have been using it for 8 years now, trouble is we also changed our system to min till and muck every acre every year, both of which I know will help to improve my soils, but I honestly believe that gypsum has been one of the major factors
- Location
- America's dairyland
http://corn.agronomy.wisc.edu/Management/pdfs/a2986.pdf Here is the University of WI publication with the broken link in the link above. A potential weakness of those studies, besides being from the 70's, "Phosphorus, potassium and sulfur were maintained at optimal levels throughout the experiment." but no mention if that was a uniform application, or a replacement amount based on yield. So releasing the potash with gypsum could have been masked by greater potash application, if the study was flawed.
marco
Member
- Location
- tipperary, ireland
Sulphur will knock off Calcium or Magnesium, whichever is the most excessive in the soil reserves. However, basic agronomy or some knowledge of your own soil combined with advice means you should never be applying gypsum to soil with a decent Calcium content.
If you're trying to condition heavier soil with gypsum, you'll likely have excessive mag levels, so gypsum will work. The Calcium content will then start to favourably tip the Ca:Mg ratio once the S has displaced the excessive Mg.
If you're trying to condition heavier soil with gypsum, you'll likely have excessive mag levels, so gypsum will work. The Calcium content will then start to favourably tip the Ca:Mg ratio once the S has displaced the excessive Mg.
dannewhouse
Member
- Location
- huddersfield
What would your reccomendations be for this soil analysis.
Very variable soil but manly fairly heavy clay.
Very variable soil but manly fairly heavy clay.
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From: Department for Environment, Food & Rural Affairs and The Rt Hon Sir Mark Spencer MP Published21 May 2024
Full details of the expanded and improved Sustainable Farming Incentive (SFI) offer available to farmers from July have been published by the...