Hi all, this is my first grow, everything has gone well although a bit slow. Three weeks ago my northern light autos went into flower and at this point I started sense Bloom A and B. 4 mm per litre. Previous I fed just filtered water. I am growing using 15 23 w cfls in a space of 500 by 1000. About three days ago I noticed one lower leaf had a slight discolouration bt the veins, this turned into brown spots and the leaf started to go from a healthy green to a pale green then yellow! I have now noticed there are more leaves with only small patches but they are there. No in to week 4 and the buds are staring to fill out! My ph is between 6 and 6.5! The change that I have made since this problem is the two part sensi Bloom!!! I don't know what to do, I've heard if I flush and auto few it can shock it to much?? Would this problem affect my bud at this point?? Pics included. Thanks I really need the help!!
Leaf problems! Help
- Thread starter Stemo
- Start date
Thanks buddy
Diabolical666
Well-Known Member
you need cal/mag...do not flush!
Olive Drab Green
Well-Known Member
That looks like calcium, magnesium, manganese, and/or potassium def.
Olive Drab Green
Well-Known Member
Maybe even phosphorus, slightly. Also, make sure you use pH once in a while at the least, for good reuptake. 6.0-6.8 soil, 5.2(?)-5.8(?) hydro.
phil k
Well-Known Member
yep its a build up issue.. honestly its more than like a said build up in the soil i see that a lot with hot soil growers and them using acid. sly is right do a flush i would do atleast a weeks flush and not use any acid just run the ph it comes out at
phil k
Well-Known Member
one thing you can always tell when theres acid burn issues is the light tan you see in the plants burnt leaves they burn from the side or tips back when theres acid issues. and its always a really light tan crispy burn. if you zoom into the middle bottom of the pic you can see it starting on the fan leaf... its really not horrible maybe one or two flushes then back to half nutes for a bit youll be fine. but do get on a fresh water feed every now and again if your not already.
Olive Drab Green
Well-Known Member
It could also be nute lock-out appearing as a deficiency due to improper soil pH, drainage, or because the plant is overnuted. But that's a coin flip. So maybe flush, repot, use 1/4 nutes and see how it responds. Make sure you know your NPK ratios and supplemental minerals recommendations.
Diabolical666
Well-Known Member
You guys are over thinking this to its death. its cal/mag def
Olive Drab Green
Well-Known Member
That's what I think, but if it is nute lock out, it will appear that way, and even adding calmag won't change that because the plant is locking it out. And if it is abundance causing lockout, it could be detrimental to add more.
Olive Drab Green
Well-Known Member
Do we have a pH on the subject plant?
Diabolical666
Well-Known Member
never seen a lockout on a cpl leaves. This is the typical cal/mag deficiency in a progressed state.
Olive Drab Green
Well-Known Member
Maybe a copy of your nute, water, transplant, light, and time elapsed schedule, OP.
Olive Drab Green
Well-Known Member
I'm with you, Diabolical, but I am just suggesting ruling the rest out.
Olive Drab Green
Well-Known Member
Definitely not, hence the purpose of flushing.
phil k
Well-Known Member
if the soils not being properly flushed the chemical build up that occurs makes the media more acidic.. which in return to your favor can cause cal mag issues but are the issues it needs calcium and magnesium or are the issues he needs to flush his media and get it back to the proper ph levels for uptake to occur without deficiency.