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Ferrous Sulphate ratio known to anyone please?

MeomyeMeomye Posts: 879
in Problem solving
After my recent attempt at feeding the lawn with ferrous sulphate I can report it did not show any signs of greening up. I am guessing my ratios were wrong. In my defence, anyone who has attempted to research said ratios will agree that it is very confusing! If anyone has any tried and tested results I would appreciate some guidance on this matter. I realise there are much better products out there and I could also have got professionals in to do this but I have purchased a tub of the stuff so I need to master it somehow.  Many thanks

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  • ObelixxObelixx Posts: 29,645
    According to the RHS, ferrous sulphate is the moss killing ingredient in lawn weed and feed mixes.   No info on rations anywhere but they do say this - 

    Note on ferrous sulphate: Although ferrous sulphate is widely offered as a fertiliser and soil acidifying agent, unless it is contained within a proprietary lawn mosskiller it is not approved for use as a pesticide and cannot be legally used to control moss. In addition, if it were to be applied as a mosskiller on lawns there is a high risk that it will blacken and potentially kill the grass - a problem seldom encountered with proprietary lawn mosskillers, especially those in pelleted forms, making them easy to apply evenly and accurately.
    Vendée - 20kms from Atlantic coast.
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • MeomyeMeomye Posts: 879
    Thanks Obelixx, when I purchased it, It was supposed to be good as a moss killer/feed and if less product was used, it would be great for a green lush lawn. There is a feature on the lawnsmith site but I need a maths degree to understand it! I did check out reviews when I bought it and even then, there were a lot of queries on ratio.
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  • MeomyeMeomye Posts: 879
    Thanks Ian, the Sept-April reference is for 'hardening and disease' for green up it says 'pretty much any time of year as long as good soil moisture available and no strong sun or heat' admittedly the recent weather is not a good time, but otherwise should be able to use regularly. 
  • MeomyeMeomye Posts: 879
    Ian, blurb on site says 50g-150g to treat 100 square metres of lawn if I use 150g/10 litres as you suggest, that's just one watering can, doesn't quite seem right as that surely wouldn't cover 100 sq m ? even more confused now 
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    edited July 2018
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  • glasgowdanglasgowdan Posts: 632
    edited July 2018
    For moss killing I use about 1kg in a 10-15l sprayer, sprayed on slowly for good coverage. Use a marker dye to avoid missed strips.
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  • MeomyeMeomye Posts: 879
    Thanks everyone, I was using a watering can with a weed bar as recommended by L Smith. I have had several of those sprayers over the years but I always have trouble with the nozzles for some reason, I never seen to get an even spray.
  • glasgowdanglasgowdan Posts: 632
    edited July 2018
    Nozzles need to be replaced regularly.  I cover mine any time they're going in the van. A sprayer put in a shed and moved about now and then will almost certainly have a damaged nozzle
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