Young plants remaining yellow?

**Help Please**

A ''friend of mine'' has a few little plants growing that are about 15 days old -

and 2 of them have had almost completely yellow bottom leaves since about day 4. They look ill.
They were in small seedling pots for a little to long I think, so 'he' recently transplanted them to 1 gallon pots.
**'HE' is aware that yellowing is caused by Nitrogen deficiency but he has been adding small amounts of diluted ferts and it doesn't seem to be helping.
Ever since he transplanted, the top leaves have been remaining green and looking healthy - would it be better to remove the bottom leaves and hope healthier new ones grow through? or continue with ferts? It may be that he is over-watering - could this be the cause of the yellowing?

Exactly the problem i'm having. My plants are a little older - 3 weeks - and the 2 lowest leaves have started going yellow in the last 3 - 4 days. I'm using good soil and the plants are too young to make me think that they already need nitrogen added. I'm giving them ONLY distilled water so don't think I have a ph prob. Can it be overwatering? Someone suggested this on one of my threads, but really... I have been so careful not to water too much.

How often does your friend water?

yeah i got the same problem mine are almost two weeks and the lower leaves are yellow it is because of overwatering i found this out becuz someone was watering my plants when i was a sleep thinking they were helping me..ha but yeah its from over waterin. once every fivedays i when you should water...peace

Its not like the fertilizer is goin to work in 2 seconds. It maybe a week or until ya see the difference. Over watering will rinse out the nutrients out of the soil. So when ya water and ya have a shit load of water coming out the bottom then that will rinse out nutes.

its too much water. the pot should dry out and feel light when you pick it up before watering again

Wait, by 'lowest leaves' do you mean the round ones that first came out of the seed? Because i think those are supposed to go yellow when the get eaten up as food...

epsom salt!!!!!!