Hello Arif,
I think these plants need what they would grow in happily in nature, I grow everything in pots in a very free draining mix of 'river soil' which is dug from a roadside ditch along my property front, it's the more gritty sand particles which aid drainage and there's always leaves rotted into it. To that I add compost from mainly leaves off my Horse Chestnut tree but with some grass cuttings, I aim for a 50/50 mix by volume. I haven't found anything which does not thrive in this mix, nothing artificial added. Micro organisms develop in composted leaves which aid the uptake of nutrients to the plants.
http://en.wikipedia.org/wiki/M...
Microorganisms also are responsible for building fertile soil for plants to grow in. Microbes stick to the roots of plants and decompose dead organic matter into food for the plant to absorb. The plants that live and grow because of the microorganisms that live on them make a home for other animals to live in.
http://library.thinkquest.org/...
I think that by using artificial methods you will destroy the essential elements which help keep a plant healty, then the chemical companies can sell something else to combat the effects of ill health. Too many nutrients can be harmful too, plants in nature have not been able to adapt to these, the plants may thrive for a while then suddenly collapse on you with the result the grower will try to revive it with something else which will not help it. I believe in the KISS theory, "keep it simple stupid".
The upper lip has had to be very stiff lately!
