Yellow leaves at bottom.

Hi. Quick background;
Day 21 , exactly 3 weeks old today. Grown under 600W HPS in Plant Magic soil, being given plant magic grow nutrients which goes well with soil. Water has been PH of around 6.4 for last 2 weeks.

the rest of the plant seems ok, no leave seem affected. New growth is happening; but these under leaves right at the bottom of the plant are going yellow! any ideas? Tried to take as many pics. You’ll see the plant looks good and healthy, no signs of yellow or yellowing leaves, except this one.

I heard this may have to do with nitrogen deficiency but im going to follow since i am having the same problem (outdoor potted grow)

Yep, that's almost certainly Nitrogen deficiency.

N deficiency shows itself with the yellowing of the bottom most leaves. The yellowing slowly moves up the plant.

it needs to be taken care of ASAP before it affects the rest of the plant

How? The food I’m giving it has N in it, and I’m feeding it all the time, are you saying I should be giving it more ??

I don't see very clearly, but to me, it could be splash damage from nutrient solution, did you water it over the leaves? I know my get damaged like that, nutrient solution for roots is just to strong for leaves.

iobloop said:

I don't see very clearly, but to me, it could be splash damage from nutrient solution, did you water it over the leaves? I know my get damaged like that, nutrient solution for roots is just to strong for leaves.

Click to expand...

yeh I’ve splashed the leaves once or twice not going to lie.

On photo i don't see many yellow leaves, just one particular with some additional spots. Usually, they don't get yellow if they are just a little splashed, perhaps they get only spots, but, those on the bottom do get yellow if they are submerged couple of times, splashing pushes them down to soil and they submerge in rinsing water, that is from my experience. But i'm just guessing, since you said you do feed it properly and other plants are ok. Measuring PPM levels of nutrients and runoff are essential and some basic meter is not expensive. Many times its up to the plant how many it needs regardless if the strain is the same but I wouldn't just add more without knowing PPM levels. If its just one leaf, i would wait a bit longer to be sure, a little deficiency is definitely better than toxicity and lockout.

iobloop said:

On photo i don't see many yellow leaves, just one particular with some additional spots. Usually, they don't get yellow if they are just a little splashed, perhaps they get only spots, but, those on the bottom do get yellow if they are submerged couple of times, splashing pushes them down to soil and they submerge in rinsing water, that is from my experience. But i'm just guessing, since you said you do feed it properly and other plants are ok. Measuring PPM levels of nutrients and runoff are essential and some basic meter is not expensive. Many times its up to the plant how many it needs regardless if the strain is the same but I wouldn't just add more without knowing PPM levels. If its just one leaf, i would wait a bit longer to be sure, a little deficiency is definitely better than toxicity and lockout.

Click to expand...

I’ve just had a proper look at the plants. All 6 have entirely green leaves , not too dark, but not lime green heading yellow. It’s weird. The only two leaves were at the bottom of one plant and had mud / soil on the underside of the leaf. I’ve pulled it off now, the plants are 40cm tall (ish give or take a cm) so I’m not worried about stunning the plants, the leaves were quite shaded too. I’ve taken a proper pic now they’re off the plants. Appreciate that you’re probably gonna tell me that wasn’t a smart move, but I looked at it logically - if it was a nitrogen difficency then they’d all be turning yellow as they’ve all had the same feeding routine and patterns, with a top branded nutrient line of Old Timers Grow, with 5-3-3 nutrients, 5 being Nitrogen I believe? They’ve had 4ml just yesterday, prior to that they had 3ml in week 3, 2ml in week 2 and just water in week 1. All the leaves seem the perfect healthy colour. I left it 24 hours and then looked again and it’s not spreading anywhere on the plant or leaves. The plants if anything seem to be going through a growth spurt and have got bigger overnight.

did I do the right thing do you think?

It does look like nitrogen, either is the lack, or roots of that particular plant cant absorb it.(soil ph (calibrate ph meter regular also), watering practices, runoff ppm). Perhaps you fixed it by increasing the dosage and it wont spread. Best of luck.