Mystery Deficiency in Flower

[ostrichfarmer]

Hi Icmag-

I have been having the same problem for about a year now. Between week 2 and 4 of flower, the fan leaves in middle of the plant start to turn brown. I have tried everything I can think of.

I was using pro-mix soil and tried switching nurtients a few times, with the same results. I started adding cal-mag to my RO water. Now, I am using FFOF in large pots (25-45 gallon) and giving just ph-ed, cal mag RO water.

I could be wrong, but it seems like the plant cant get the nutrients it needs once budding begins, re gar dless of what is in the soil.

I run a perpetual so I will put up pics of plants at different stages:

These plants were put into flower about 5 weeks ago. They always start out healthy:




Here are some Agent Orange about 3 weeks in:

 

[ostrichfarmer]

Some Chocolope vertical about 4 weeks in:








Any help would be much appreciated.

 

[Angel215i]

Nutrient burn

 

[Miraculous Meds]

Yep looks like they are burnt the shit out of.

U using just ocean forrest and water. When I used to use it straight it would do that, then I started mixing it with even parts of top soil with no extra food. Get a runoff water test and see what ur ppm or ec is coming out. I bet its over 2000 or 4 ec.

 

[Miraculous Meds]

U need to get a temp reading at canopy distance from the bulb, and make sure not to much wind from the fan is blowing on those leaves.

 

[Miraculous Meds]

what lights are u running?

How far is the front of the canopy from the bulb.

U got a fan under the lights, if so what kind how big.

Whats ur temps and rh?

Whats ur runoff ec and ph?

Start with that and we will get u on track bud!

 

[Snype]

Considering that you are using huge pots of FFOF soil and you are not giving nutrients, i'd have to rule out over feeding. I've been using FFOF for many years and I personally like it. I grow in 5 gallon pots and because my pots are so much smaller, I have to add nutes into my water every 2 weeks or so. You should't need to with pots so big. I think what's going on is the pH of your medium is low. You should check your run off. This happens to me with FFOF all the time. You most likely will have to raise the pH of your medium back up to 6.4. I notice once my run off falls below 6.0, I have these types of problems. Even though I water my plants at 6.8, eventually the water comes out the bottom under 6.0. When I tested FFOF out of the bag, it was 6.4. That seems to be the sweet spot for what the medium should be.

 

[Miraculous Meds]

Considering that you are using huge pots of FFOF soil and you are not giving nutrients, i'd have to rule out over feeding. I've been using FFOF for many years and I personally like it. I grow in 5 gallon pots and because my pots are so much smaller, I have to add nutes into my water every 2 weeks or so. You should't need to with pots so big. I think what's going on is the pH of your medium is low. You should check your run off. This happens to me with FFOF all the time. You most likely will have to raise the pH of your medium back up to 6.4. I notice once my run off falls below 6.0, I have these types of problems. Even though I water my plants at 6.8, eventually the water comes out the bottom under 6.0. When I tested FFOF out of the bag, it was 6.4. That seems to be the sweet spot for what the medium should be.

Yeah well that low ph is probably coming from the strength of nutes. Either that or root rot causes lowering ph too.

 

[Snype]

Yeah well that low ph is probably coming from the strength of nutes. Either that or root rot causes lowering ph too.

If you read what he said in the first post, he's not using any nutes on this run. Unless I'm reading wrong.

 

[ostrichfarmer]

Thanks for the responses.

The plants have only had 60 ppm cal mag RO water. They have been in FFOF their entire life. I put 4 plants into flower every 2 weeks for a perpetual harvest so I have had about 12crops go through my flower room in the last three months. Every plant has been very healthy all the way through veg and the stretch phase of flower. Once buds begin to form, the plant goes south. It seems unlikely (to me anyway) that nute burn would be the problem.

The bulb is being ran at 600 watts about 17" from the cool tube (19" from the bulb).

I have a small Honeywell turbo fan at low speed under each light. I gives a gentle flow of air upwards around the cool tube.

Temperatures are 74 in the room and 77 max at canopy. Humidity is about 55%.

I will check the runoff tomorrow and report back.

I notice the ec from the runoff of FFOF is always very high and the plants love it (at least in veg). I assumed that ec just wasn't an accurate way of measuring the nurtients in an organic based soil. Anyone else have experience with this?

 

[RetroGrow]

Root aphids possible. Have you checked your roots? I would pull one out of it's pot, and examine for root problems, and check run off PH as suggested.

 

[Miraculous Meds]

I think it fits P deficiency pretty well. U can get that from cold/wet soil, low or high ph soil as well. u should be between 6 and 7ph. Prob aim for 6.5.