Yellowing leaves during flowering

[su44us]

Hello all. Frst timer here in need of a little help

my girl is about 3-4 weeks into flowering, and I have begun to notice pretty serious yellowing of the bottom leaves that would indicate N def. I am using the Bio-Bizz feeding schedule, and am currently in the 3ml/L Bio-Grow, 3ml/L Bio-Bloom, 1ml/L Top-Max phase. I have been feeding with every watering. Recently I bumped the Bio-Grow to 4ml/L in response to the yellowing. I have fed a couple times at this amount with no sign of improvement (if anything the yellowing has continued to spread).

I am using my own soil mix (a bad one. I will be using ocean forest next). My runoff tests to 6.5, and I have been PH balancing my nutes to 6.5-7.0.

Is this about the time that I should expect N def due to flowering? It seems early to me. Should I increase the level of N I am feeding?

I can post pictures if it would help... But it looks like pretty standard N def to me.

Thanks

 

[GREANTHUMB]

Id have to see it for myself... arethere splotching and spotting or a yellowing throughout the whole leaf??? youd be best posting a picture of this condition.. By the way... id say you might be running your ph and nutes a tad rich. Id say lower the ph to around 6.2 and give your plants a rest from feeding...

 

[brightside]

i am just finishing my first run with bio-bizz and its given me superb looking results. I stopped feeding 9 days ago and the bottom leaves started yellowing 3 or 4 days after
- my schedule said 1ml/l grow throughout - Im no expert on ferts but it sounds like you are using too much grow rather than too little - hope this helps

 

[GREANTHUMB]

good luck bro... like i said... lower your ph to around 6.0 and go a day with NO nutes. then go a little leaner on the nutes and keep an eye on the ph...

 

[su44us]

Brightside. The Bio-Bizz schedule lists using 1ml/L grow if you are using their brand of soil mix (All-Mix). They recommend using more if you are using the "Light-Mix" or other lightly or non pre-fertilized soil mix.. The soil mix I am using has a very low level of ferts added (basically just a little humus). I called GHBB and the person I spoke with recommended that I follw the feeding schedule for "Ligh-Mix" with my soil type.

You can get the Bio-Bizz feeding schedule here...

Bio-Bizz feeding schedule

As you can see, in week 3 of bloom the feeding schedule is 3ml-3ml-3ml-1ml. I am not using the Alg-a-Mic product because although I am sure it works great.. The spokesman at GHBB said it was basically a growth enhancer and not necessary for nutrition.

Greenthumb -

Here are some pictures.

 

[su44us]

I don't think the PH is a problem.. Everything I have read sates that the prime PH for nutrient uptake is 6.7 And that Cannabis specifically likes it there as well.

I think I am fine with PH since i can't find anything that states that there is any nute that doesn't like it there.

If you have some sort of reference to show me that 6.7 is a problem I would greatly appreciate it since I am still learning here.

 

[Guest]

in my humble opinion she looks like she needs a little nitrogen....but other than that apears to be happy

 

[su44us]

in my humble opinion she looks like she needs a little nitrogen....but other than that apears to be happy

I guess back to my original question. Do you think 3-4 weeks flowering is a normal time to expect some yellowing, or is this too early? (seems early to me)

Should I do something to increase N, or back off like others have said?

It's a little disconcerting since if it is N def, and I back off, it will get worse.. If it is over feeding, and I add more, it will get worse...

Ayeee! What to do?

 

[GOATNUTS]

your feeding way too much...

http://www.icmag.com/ic/showthread.php?t=13689

 

[GREANTHUMB]

scream really loud.... flush your nutes with water(IME it will never do any damage)unless youve just been OVERwatering. it does seem to look like it might be a N def..... it also seems early(like you said)for the leaves to do that(if it happens.). Id also say that i only have 2 strains that like that kind of ph level,6.7(widow/hindu kush).. all my REAL kush strains prefer more like a 6-6.3

 

[su44us]

your feeding way too much...

http://www.icmag.com/ic/showthread.php?t=13689

Are you sure I am feeding too much?? I was under the impression that Bio-Grow/Bloom was formulated for cannabis, and was meant to be administered with every watering. And that the feeding schedule and strengths were suitable to cannabis.. I am aware that with other ferts you need to dilute and not feed with every watering.. For example, during veg phase.. I was feedng with MetaNaturals 3-3-3 at 1/4(at first)-1/2 (towards end of veg) strength once per week.

Do you see signs of nut-burn/lockout? It really just looks like N def to me... But I am hesitant to add more nutes.

Greenthumb... You tell me to flush, and then say it looks like N def. Do you think N is being locked out from over fert? If so, how come there aren't other symptoms?

At first I thought I had a simple N def... But now you guys are scaring me... Flush?? Feeding "way" too much??

Help?

Keep in mind the NPK of the food is:

Bio-Grow 1.8-0.1-6.6
Bio-Bloom 1.1-2.5-2

 

[GREANTHUMB]

i really have no experience with those nutrients. I the reason i say flush is because if you do have some sort of "lockout" it will help you start from scratch/give ur plants a rest from all the nute abuse. also... check ur ph.all around different parts of the soil.

 

[GREANTHUMB]

MAKE SURE UR NOT DROWNING YOUR PLANTS.... depending on the soil properties that could be a problem.

 

[sproutco]

I am using my own soil mix (a bad one. I will be using ocean forest next). My runoff tests to 6.5, and I have been PH balancing my nutes to 6.5-7.0.

Depends on what your soil mix is as to whether the ph is really too high. Directions for properly testing soil ph are in my signature below. It requires distilled water.

 

[su44us]

Ok..

I am starting to think that I have been over feeding. I think I made a great error in interpreting various sources, and now I have done what I was trying hard not to.

If this is the case, then the nitrogen has been locked out? What nutrient locks out nitrogen?

Should I flush? Since I am using organics, can I simply get away with not feeding? I guess if nitrogen is truly getting locked out, then I will have to flush.

this sucks

 

[dre86]

Here's what you need:

 

[su44us]

Someone help... If I need to flush, I want to do it as soon as possible. I'm starting to think I have ruined it, and panic mode is setting in.

Do I need to flush now? And if I do flush, should I flush with my straight tap water (which measures PH of 8.5 or higher with my testing solution) or should I PH balance it?

please help... This is really a bummer!

 

[GOATNUTS]

hey bro give it a good flush...

 

[su44us]

Ok...

I contacted GHBB, and asked them about thier feeding schedule. The technician told me that I had indeed been over feeding but that he seriously doubts that this would damage my plants, and didn't recommend that I flush. He said that the available nutes are so small that it's very hard to cause lockout/burn with most organics. Said that organics require a healthy microbial environment in the soil, and it takes time for the nutes to break down in a way to be accessible to the plant.

I started off using MG general purpose, and switched to MetaNaturals after I learned a bit more about what I was doing. I doubt the soil mix I used had a healthy microbial environment.

He seemed to think the problem may be that the immediately available nutrients aren't enough to support the plants needs and recommended I add a mineral based nute supplement at very diluted strenth 1/week to add available N.

Does this sound right to any of you?

 

[Guest]

no...knowing biobizz products, I'm sure your ph is not good because you give them the correct amount of food.lower the ph to 6, feed them normally.The same happened to me, I lowered the ph to 6, fed with 4ml grow, 4 ml bloom, though I was using great canna dirt.Well it worked.You can lower and cut the grow food later in flowering, not yet.
Algamic cntains micro nutrients and growth hormones; some say hormones delay flowering
still adding a little to every watering supplies the plant with all the micro nutes she needs.

So far, no need for it, just try my trick.damaged leaves wont recover