feeding question. im a little confused. plz help

Hey guys,
I have a few girls about to enter their 3rd week of veg (currently 19 days after sprouting)
about a week about i began to use bio-grow after i was told by the guy at the shop to use it for the entire life cycle. its a light ORGANIC nutrient solution (NPK of 8-2-6). Bottle says use 2-4 ml per L of water. i used 1 mil per L. i then noticed some plants starting to get a slight nute burn. i immediately stopped with the Bio-gro and started doing some research cause i thought it was very hard to nute burn with organic nutes. i realized that the soil that i bought has these little yellow nute balls. im pretty sure thats the problem. the plants look rather healthy. lots of growth.

my question: since my soil already has these nute balls, and two plants already showed signs of nute burn, when should i start to use the bio-grow again. i read most people start with nutes after week 3 of veg. thats in 3 days for me and i dont know if i should wait longer cause of the nutes already in my soil or if by then the plants will be big enough and old enough to handle the extra nutes.

What type of medium; soil or hydro? SOIL
What brand and type of soil? not known. seems good. lava rock, sponge and all sorts of good stuff. also has little yellow nute balls.
Indoors or outdoors? Indoors
What strain? Trainwreck
How old are the plants? 19 days since sprouting
What type of lights and how many watts? HID. 400W HPS w/ cool tube
How far from the lights? 24 inchs
What is your watering frequency and source of water? tap left out to aerate. PH down to around 6.5
What, how much and when was it fed? NPK? used Bio-Grow (8-2-6; organic; used 1/4 prescribed dose
What is the medium/runoff pH and PPM if in hydro? not totally sure. have crappy prong checker but i dont trust it.
What are the temps and humidity in the room? around 80-82 w/ light 70-72 without
What size pots? not sure, not small tho.
Any bugs? Look real close. no bugs
Any other pertinent info? I think they're pretty healthy. a few were transplanted 7 days ago and it went well.

thanks for any advice and +rep for those who help.

Sounds like you are using Miracle Gro soil. It soaks up water like a spounge and has time-released nitrogen balls that can be too strong for young plants. My only advice is to transplant into better soil a.s.a.p., your plants will thank you for it! Never used bio-grow but I would go easy on feeding until you get new soil.

majek said:

Sounds like you are using Miracle Gro soil. It soaks up water like a spounge and has time-released nitrogen balls that can be too strong for young plants. My only advice is to transplant into better soil a.s.a.p., your plants will thank you for it! Never used bio-grow but I would go easy on feeding until you get new soil.

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I am not using MG soil. I dont live in the US currently and only had access to soil from the local flower shop. im pretty sure its their own mix. its pretty decent. very well draining. lava rock, sponge, and all sorts of other good stuff, plus those little yellow nute balls. i dont really have access to better soil so transplanting wont help.

plus, the plants seem to be doing pretty well and rather healthy (other then the slight nute burn on a few) so i am ok with staying with this soil.

my question is this: Ive read people say not too feed till week 3 of veg. should i wait a little longer to start feeding since my soil already has nutes or should i still start at 3 weeks. im afraid starting to feed now will add too many nutes and ill burn them even more. but i also dont wanna wait too long and have them become deficient.

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