I love how you brits put it in lame mens terms for us yanks.Some strains can take nutes from the start but ALL strains can cope without till week 3, so you are safer without. Seeds contain enough food for the seedling the same way an egg contains enough food for a bird/animal. Understand? Also the Tds is directly proportionate to the amount of nutrient left in the reservoir after the plant has taken a drink: or in other words. If you have a reservoir of 10 gallons with 1% nutrient in and the plant drinks 1% of the water but no nutes your reservoir will contain 9.90 gallons of water and the same amount of nutes-so your TDS/ppm will be higher.Understand? The plant isnt taking nutes because it doesnt need them.
Oh I see! After 18 years using flood and drain and not feeding for the first few weeks I must have been wrong, as most of my plants are always healthy bushy and full of buds. Damn, must try harder to be like you!!! This site is just full of people who want to argue the toss with others who are trying to help!! If you actually knew what you were talking about then you would know that water contains trace elements that are able to keep plants/weeds alive throughout their whole life cycle without ANY nutes; ooh how shocking I know, what? ''NO NUTES'' this cant be possible I here you say. Try looking at the lowryder 2 grow joiurnal on here using nothing but plain water and soil that had been used on previous grows, they look fine to me. Facts not fiction thats what I give out...here resteth my case.Anyone that doesn't feed a seedling for 3 weeks is growing in a fortified soil or soilless mix. Telling dude not to feed his E&F plants for 3 weeks is just plain dumb.
I advise no nutes for the first 2 weeks when growing a variety of strains that you dont know, obviously if you feel you know your strain well enough and you see benefit from adding nutes then go for it. I was giving advice to a novice based on my knowledge of plants and growing marijuana. I am not here to argue, only to help. From my experiments over the years when giving added nutes during week 1&2 the plants dont take the nutes, so that tells me they dont need them. Most problems you see here are from adding nutes at the seedling stage (day 1-21) so I suggest maybe you try a grow without nutes for 2 weeks and I think you will then understand where I am coming from.Well, Man, then you are actually giving your plants nutrients, because they will not grow without them. Many hydro growers use RO water (0 ppm) in their systems, would you advise they don't add nutes for the first 3 weeks?
HTH
If you are making this judgment by looking at the EC of the nute soln, bear in mind that tiny plants will use nutes but in such small qty that you may not be able to see a lot of difference in the EC measurement.From my experiments over the years when giving added nutes during week 1&2 the plants dont take the nutes, so that tells me they dont need them.
You're right in that new growers often kill with kindness; overfert & overwatering are the new grower's most common faults. I see a lot more problems from overwatering than overfert, but your caution is well taken. However, seedlings definitely will uptake nutrients. As long as you don't go overboard with nute strength, they'll be quite happy to have a feed.Most problems you see here are from adding nutes at the seedling stage (day 1-21) so I suggest maybe you try a grow without nutes for 2 weeks and I think you will then understand where I am coming from.