"Chris Hogg" wrote in message
...
On Fri, 23 Oct 2015 18:00:07 +0100, "Frank Booth"
wrote:
I am planning to buy ferrous sulphate heptahydrate crystals to treat moss
on
a lawn. I've not used this in pure chemical form previously having relied
on
proprietary brands which are more costly.
So does anyone know he correct rate of dilution for this form of of
ferrous
sulphate as I will be spraying the moss with it?
Proprietary brands are also the heptahydrate; it's the commonest form
that ferrous sulphate comes in and I can't believe they'd go to the
trouble of selling any of the rarer forms, unless by proprietary
you're meaning lawn sand, or a combined feed and moss killer. The pure
stuff will be a pale blue-green, but the proprietary stuff is usually
a bit orange due to oxidation, especially if it's got damp.
Use the same dilution as the proprietary stuff.
See this http://tinyurl.com/otrsq9q and in particular:
Iron Sulphate Properties
At room temperature Iron (II) Sulphate Heptahydrate appears as a
blue/green crystalline solid. Dehydration happens at 70oC and complete
decomposition happens at 400oC. Iron (II) Sulphate Heptahydrate
dissolves in water and the molecular formula for Iron (II) Sulphate
Heptahydrate is FeSO4.7H2O.
Applications for Iron Sulphate
Moss Killer / Control - Iron (II) Sulphate is very effective at
controlling moss on your lawn. To use, apply 5-10g of solid crystals
direct to each 1m2 of Lawn. Only apply solid product when its raining
or about to rain; if not dissolve 5-10g in 1 litre of water and apply.
Hi,
I visited the Intralabs website before I posted as I will be buying
FeS04.7H20 from them. And they suggest the rate you mentioned. But go to
other websites and they recommend a much stronger solution than that for the
same product for killing moss, eg 1.4 kg to 15 L water (to treat 500sq
m.)which is over 90 gm/litre, about 9 times the top rate of concentraion
suggested by Intralabs. So I'm still confused.
http://www.thelawnshop.co.uk/online-...s-24/soluble-s
ulphate-of-iron-for-moss-control-12-detail