Help sick yellow/brownspots leaves

mxm12

New Member
First of all hello!

I am into almost 3rd week of flowering. I have 5plants Critical and 4 Royal Caramel (both derive from afghani). i put a picture with the setup (i have 400w hps + about 200w of cfl). I use canna proffesional plus soil (which is supposed to buffer the water ph), Nutes from BioBizz and tap water filtred (i have quite an expensive fliter from zepter which is supposed to filter the chlor and any other impurities) with the ph of about 7,8.

After aplying nutes the ph get to 7,5. the runnof innitialy had 5,8 (in the first month) and now(yestarday) had 6,6. The thing is that i read alot about the ph in organic soil and everyone told me not to worry about it, and that using ph-/+ solutions would make the situation worse. by the way i do have those solutions in any case.

I add nutes every 5 days ( water every 2 or 3 days) 1ml/l (started with 0,3ml/l). the thing is that two times i dind't watered at the mentioned time (2-3 days) but at 5 days interval and the soil was absolutely completely dry. this happend in the 4th week of veg and last week. Otherwise no problems.
I water about 3L / 2L per pot (i have 15l pots and 12 l pots).

also yestarday i used plant vitality plus because i have some thrips infestation (probably appeard when i forgot to water). but that its not the problem since the yellowing leaves with brown spots apperd in the last week of veggin'.

what do you say? i really dont whant to loose this plants. they look so nice with those little buds. and i also invested a lot in them to just let them die like this.
 

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moldybologna

Well-Known Member
Over dry pots can cause lockout, also with your filter you may need to supplement with cal/mag. Molasses can boost your mag also. Looks like mag deficiency.
 

sold777

Well-Known Member
I had the same problem when I used r.o water on my first grow. I use mag cal and was okay after, you just need to supplement micro nutrients if you use filtered water.
 

mxm12

New Member
oh sorry but forgot to mention that i started to use filtered water 2 weeks ago. until then i used bottled water which did contain cal and mag. if overdry soil can cause lockout , together with low cal and mg in water should be the cause. ok now would you recommend me to spray water with nutes on the leaves (as a quick remedy)? i just watered yesterday with nutes and no sign of them being any better today.

Oh and what about molasses? how shoul i use it? how much per plant?
 

moldybologna

Well-Known Member
oh sorry but forgot to mention that i started to use filtered water 2 weeks ago. until then i used bottled water which did contain cal and mag. if overdry soil can cause lockout , together with low cal and mg in water should be the cause. ok now would you recommend me to spray water with nutes on the leaves (as a quick remedy)? i just watered yesterday with nutes and no sign of them being any better today.

Oh and what about molasses? how shoul i use it? how much per plant?
Don't spray nutes on leaves. If you want to foliage spray you can use diluted Epsom salts, if you have cal/mag I'd just add it when watering. 1-2tsp per gallon watering. Molasses, many people feed with it 2 or 3 times (or more) during flowering to help provide sugars to microorganism in the soil. 1-2 tablespoons per gallon every few weeks on the plain water days.
 
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