my babies are turning yellow...

have a few grapefruit strands and a super silver grown from seeds in a rapid rooter which worked great, then into a dixie cup in Foxfarm soin, used only water at PH 6.3 and then into these pots for now. a day or two ago my bottom leaves started to turn....not sure why, buts its all of them, i looked for reason, but it would appear everything makes the leaves turn yellow....any remodies?

hungry!! feed them lightly, slowly introduce larger amounts of food

Lack of chlorophyll, probably due to (although it can be produced by other reasons) a lack of nitrogen in the soil, which easily gets washed/leached out by frequent waterings, which is why it needs replacing regularly via nutrient feeding.

Nitrogen controls the plants ability to produce proteins for new cell protoplasm and is one of the essential nutrients in the production of acids, enzymes, nucleic acids, chlorohphyll and alkaloids. It's also the main nutrient element responsible for leaf and stem growth as well as size and vigor.

Nitrogen is most active in the younger buds, shoots and leaves in vegetative growth and being a mobile element moves to where it's needed most and that's usually in new leaf growth, which is the reason lower and older leaves start turning yellow when there are limited quanities available.

There's a whole host of other reasons for why leaf edges may yellow and not all of them are down to Nitrogen deficiency, but that is the most common cause in the vegetative growth stage. HOPE THAT HELPS

see its the older growth yellowing only NOT burning, LOOKIN GOOD BROTHA!

i was informed that for the 1st week or two in the foxfarm soil i wouldnt need to give em nutes...so i havent, they were in dixie cups till a few days ago, watered only when the medium was completely dry, transfered the dixies into these yesterday morning and onlky watered them initailly then a lil more last night before the lights went out, so its def from not over watering. that soil was fresh. i may have put a tiny bit of 200 ppm nuted water in once or twice while feeding my others plants. i was gonna whip up some more food today....say ppm 400ish is what ill shoot for, ide rathger under nute rather then over....is there something i can do to put extra nitrogen...and can you put too much nitrogen to where it will hurt them??