Plants leaves are yellow!!!

hey guys, i hate bein the noob that asks these questions, but i really need help. i have put a lot of time and effort into what im doing and i dont want to destroy it.

here goes.....im currently growing bigbud in a 1.2 x 1.2 x 2m tent with intake/outake under a 600 hps. the plants roots were filling the little pot then i replanted into a 3gl pot with some more mix. dropped the light down and let them do there thing.

Over the past couple of days, the leaves went from a little yellowish to full blown yellow on the bottom of the plant the top leaves arent really affected, they are about 5 inches tall and are sprouted from the 15 april. the temp in the tent rarely goes over 80oF.

Please help guys i really want to salvage my plants and get a good crop out of them, really want to hear some opinions and diagnostics from you.

Thanks very much for reading, and once again sorry about these questions, but it has to be done lads.

sounds like you need to feed them, what food are you giving them and when was the last time you fed them?

Cannabis Nutrient And Deficiency




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.

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 appear normal.
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.
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.
MAGNESIUM (Mg) Lower leaves yellow and may even turn white while veins remain dark green. Blades die and curl upward.
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.
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

hey man hows it going. thanks 4 replyin. i havent fed them yet as i wanted to wait a week or so more, i thought that plants from seed have enough nutrients from 3-4 weeks. do u agree. or should i start feeding them a bit of nutes?

start feeding them they would need it

hey spanishpassion, if your using good soil ie canna coco bio bizz fox farms etc then nutes will allready be in the soil and can last from 3-12 weeks, so your right in saying 'i thought that plants from seed have enough nutrients from 3-4 weeks' sounds to me like you may have overwatered them a little if they are yellow, (had this problem myself) if you think giving them extra nutes and if you must, try a nute with NPK (nitrogen, phosphorus and potasium) with a ratio of about 12:6:6 (12-N, 6-P and 6-K) usualy yellow leaves means underwatering and brown leaves are not watering enough, im not saying that is defo what it is as there are a lot of other things that may have caused this i wont say what exactly as the list is as long as pinochios nose lol hope i helped in some way and happy growing.