Hampshire,
United Kingdom 
Can brown patches on lawn be treated successfully with sulphate of iron ?
3 Sep, 2010
Answers
Brown patches on lawns may be causes by pet urine, chemical spill, leatherjackets [crane fly larvae (daddy longlegs)] eat plant roots, so do chafer grubs (vine weevil larvae).
3 Sep, 2010
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Sulphate of iron is the main component of moss killing treatments, so I can't see it would help brown patches much. Best to establish why you've got brown patches in the first place.
3 Sep, 2010