Here's a quick guide to some common treatments used by gardeners.
Armillatox
Autumn and Winter Lawn Feed
Bonemeal
Calcified Seaweed
Lime
Lawn Feed, Weed and Mosskiller
Milk
Phostrogen
Rose Food
Spring and Summer Lawn Feed
Sulphate of Iron
Sulphate of Potash
Sulphate of Ammonia
Superphosphate