Posted: 02/11/2012 at 07:04
Deplete the soil and caustic Verdun??-sorry but I have to disagree-I feel you are going to have to justify that statement-this is news to me
Organic based fertilisers do feed the soil, artificial fertiliser do feed the plant but they do not deplete the soil and caustic makes it sound like a bad thing,
All fertilisers contain NPK in different amounts it just depends on what is needed as to what you should use
Growmore or National Growmore as it was originally called is a useful and cheap all round fertiliser developed in the 1940's as part of the Dig For Victory campaign and has by used by millions of gardeners gardeners since then with no ill effects.
Manure/compost etc condition the soil have few nutrients but do encourage worm and mini-organism activity