seedlings leafs turning yellow

the seedling is about 2 weeks and i have been seeing yellowing near the stem of the plant. the room is keept from 60-85f. They are in soil and the ph is from 7-6. i water with the same ph 7-6. useing a 400w MH not sure if its mag def or what but im stumped....

I'm no pro, but from what I have learned any yellowing is a sign of N def. What soil are you using? Does it have nutes in it? Are they time released?

Also, 400W on a seedling is'nt really advised. Could be to much for this baby.

Not all yellowing is from N deficiency.

This may help, again I am no pro.....
Symptoms Yellowing of: Young leaves Middle leaves Older leaves Between veins Old leaves drop Leaves curl over Leaves curl under Yellowing of: Click on the button for more informationTips Burn: Young leaves Older leaves Young leaves wrinkle/curl Necrosis Growth Stunted Dark/purple color Pale color Mottling Spindly Soft stems Hard/brittle stems Tips die Bad roots Wilting


N - NITROGEN (N)

Pale plants, red stems, smaller growth. Rapid yellowing of lower leaves progressing up the plant. Add any chemical fertilizer containing N. Treated plants recover in about a week.

P - PHOSPHORUS (P)

Slow or stunted growth, red stems. Smaller leaves that are dark green. Lower leaves yellow and die. Add chemical fertilizer containing P. Affected leaves will not show recovery but new growth will apear normal.
K - POTASSIUM (K)

Affected plants are usually tallest and appear to be most vigorous. Necrotic spots form on lower leaves. Red stems. Leaves appear pale or yellow. Add chemical fertilizer containing K.

Ca - CALCIUM (Ca)

Lack of calcium in the soil results in the soil becoming too acid. This leads to Mg or Fe deficiency or very slow stunted growth. Treat by foliar feeding with one teaspoon of dolomatic lime per quart of water until condition improves.
S - SULFER (S )

Plants suffering from S definciencies exhibit yellowing of new growth. Mix one tablespoon of Epsom salts per gallon of water until condition improves.
Mg - MAGNESIUM (Mg)

Lower leaves yellow and may even turn white while veins remain dark green. Blades die and curl upward.

Fe - IRON (Fe)

Leaves on growing shoots turn pale and veins remain dark green. pH imbalances make iron insoluble. Foliar feed with chemical fertilizer containing Fe or rusty water.

Mn - MANGANESE (Mn)

Necrotic and yellow spots form on top leaves. Mn deficiency occurs when large amounts of Mg are present in the soil. Foliar feed with any chemical fertilizer containing Mn.
B - BORON (B)

Growing shoots turn grey or die. Growing shoots appear burnt. Treat with one teaspoon of Boric acid (sold as eyewash) per gallon of water.
Mb - MOLYBDENUM (Mb)

Yellowing of middle leaves. Foliar feed with chemical fertilizer containing Mb.
Zn - ZINC (Zn)

White areas form at leaf tips and between veins. Occurs in alkaline soils. Zn deficiency can be treated by burying galvanized nails in the soil. Chemical fertilizer containing Zn can also be used.

Cu - COPPER (Cu) Fungicide, sulfate [Cocus] Apply foliar.

OVER FERTILIZATION

Causes leaf tips to appear yellow or burnt. To correct soil should be flushed with three gallons of water per one gallon of soil.

I am useing FFOF for soil and the light is about 24' did the hand method. If it is N def what can i do i have been told to yung to add nuets.

Right on, from experience myself I had some Purple Train Wreck do the same thing to me when I stuck her in the same soil and after 5-7 days she is healthy as an ox. I would'nt add anything to it. Just wait a week and see how she takes. Should be ok.

try to keep ph at 6 not 7