When do I first use nutrients?

I have grown a couple of crops with very varied results. I am aware that the plants first few weeks of life can have a major impact on the other factors, yield, potency etc. In order to give my plants the very best this time I have been checking out some grow guides to find out when to first administer nutes. The answers appear to be inconsistent, ranging from applying very light nutrient solution after 2 days of light, to giving nutes after 10 days of light. Can anybody shed any light on this?

Mcplop

"Why be wise when you can be a fool?"

They're fine for about 2 or so weeks with no nutes. They have nutrients stored up already when they are seeds, and that's what those 2 round leaves are for, the cotlydons, they are only there for food. Burning them is the worst thing you can do when they're that small.

Many thanks mate.
Mcplop

start ur nutes after u see 4 sets of true leaf..
always IMhop...(vitamine b12 n rooting hormones will keep nodes closer)
keeps...