What's new
By:
GrowWeedEasy.com
You're browsing as a guest. Sign up to join the conversation, share your grows, and get help from thousands of fellow growers — it's free and takes less than a minute.

can someone help me diagnose this issue?

dustydundee

dustydundee

New member
This is some Chocolope on day 39 of veg. Using Ocean Forest soil with added perlite. Using GH trio with calmag. Temps around 70. Basically these leaves started to go brown about a week ago. A few weeks ago, I underwatered her for an extra day, she didnt like it, and some of the leaves discolored yellowish. Since then, she has been getting watered every 2 days. I've been light on the veg nutrients cause I'm using Ocean forest soil, and really right around now, from what I've read, is when that soil starts to run out of nutrients. I thought this was a phosphorous issue so about a week ago I gave her some of the foxfarm guano supplement, and yesterday I gave her the early flower mix of the GH trio, trying to boost her phosphates. Not sure I'm seeing any improvement, so wanting a fresh set of eyes on this. Is this phosphorous, or some other issue?
 

Attachments

  • PXL_20210316_122841817.jpg
    PXL_20210316_122841817.jpg
    2.8 MB · Views: 0
  • PXL_20210316_122736243.jpg
    PXL_20210316_122736243.jpg
    4.2 MB · Views: 0
  • PXL_20210316_165306435.jpg
    PXL_20210316_165306435.jpg
    3.3 MB · Views: 0
  • PXL_20210316_165300877.jpg
    PXL_20210316_165300877.jpg
    3.7 MB · Views: 0
  • PXL_20210316_165256021.jpg
    PXL_20210316_165256021.jpg
    3.5 MB · Views: 1
Hi dustydundee
I see that browning is happening at the lower and middle leaves...could be PH fluctuation, see below link. Have you been measuring the PH when you add water and nutrients? Could be the cause of other deficiency signs as well.
 
When you’re watering be sure to mix up your pH, i.e. go with 6.5 one time, next time 6.3, then 6.5, then 6.2 ... I don’t mean exactly like that but make sure you aren’t always going with the same pH. Almost every time I have a nutrient issue it’s because of a pH problem - the nutrient is present in the soil but the plant can’t effectively use it because of pH
 
This watering and pot container is what we practice in the tutorials and all grow sites tell the same thing. If you ignore or try without knowledge mistakes will continue. No transplant, not knowing the size of the plant will get you into issues like this. Lack of proper water needs and over feeding. Hopefully they don't suck up the runoff and sit in water.
 
Hi all, thanks for the replies...

as far as PH, I've been PHg each time to the low 6s. I shoot for 6.25 to 6.5. I ph it every time. I use the same meter for about another dozen plants.

As far as watering every 2 days, I've been weighing each pot and water when its light. When the plant was younger, it was going every 3-4 days, now based on her weight, she gets light every other day. She's in a 7 gallon container and I never let them sit in runoff. I originally had them in 3 gallon pots and transplanted them into 7 gallons a few weeks back cause they were drying out.
 
The only thing that I can think of to suggest is to test your runoff, try and determine if something weird is going on in the root zone. Sort of looks like calcium def. too but your PH going in is ok for calcium.
 
agree with Jeff, next time you water, PH to 6.2 and run enough water thru it that you can test the Ph of the run-off. Im thinking a full blown flush might be in order.
 
good suggestions. I figure she will be due for a watering within the next day or two. I was thinking I was going maybe a little lite on my veg nutrients, but you think a full flush would be better first? (ok I had watering problems in my last grow, but this one is going much better. my other plants look good. if anything, i'm underwatering this time. I weighing these damn things every night and this guy seems to be light every 2 days or so) In any case, lets say within the next 24-48, she'll be dry. Last time I gave her some bloom supplements because I was thinking phosphate issues. Shall I give her a dose of the normal GH veg trio with calmag, or just do a full flush on her, followed by the GH veg after that dries???
 
Nope, give it nothing but Ph 6.2 water. Give it lots till it runs out the bottom of the pail. dont test the first batch of run off, give it another good soak till run off and then test. If its not close to 6.2..then you'll need to think about flushing
 
I have also been struggling with what I believe is a phosphorus deficiency with one of my plants on my current grow. Your symptoms are similar. I had read that phosphorus is best absorbed by the plant above 6.2 pH. I have been feeding at about 6.5 pH, but my runoff is always about 6.2 which I think has contributed to the problem.

The plant with the deficiency is the one getting the most light, so I probably was too cautious and underfed it. I now understand that more light requires more nutes.
 
homegrown, I think I will follow that and do a good rinse with some PH water. I'm pretty sure I've been underfeeding it leading to this deficiency.... i guess my only concern/question then is, if this is the result of underfeeding, then by flushing it out now, wouldn't I be starving the plant more of some nutrients because then I'd have to wait several more days for it to dry back out before feeding it again? You'd think I'd be better off flushing it out, testing the runoff, and then feed at the same time after I flush on top of the flush? just askin....
 
It is a photo, correct? Either way it will be ok with no nutes for the couple days until it's time to water again.
Now you have clean medium to work with then just start back with your gh trio and cal mag at whatever week/stage your plant is at.
I don't do soil so I don't know if you have to recharge the calmag like you do in coco.
 
I'm pretty sure it's a calcium deficiency I'm seeing here (as well as some light burn at the tips of the top growth, but that's of little concern). Assuming you're feeding it enough calcium, then it's likely that the soil is too acidic. Hot soils shouldn't really be flushed afaik, but if this is really a problem with the pH then this might be necessary. Try to just water it and measure the run-off pH, if it's too low then you can proceed with the flush until the pH rises to an adequate level, and immediately feed it a pH'd solution of nutrients (including calmag), otherwise it'll just starve until the next watering.
That is, unless you're worried that it'll compact the soil too much, but if it has enough perlite mixed in it this shouldn't be a problem.

Edit: for future reference, adding some dolomite lime to your mix (before transplanting) is a good way of providing both calcium and magnesium to your plant, as well as maintaining an adequate pH level, specially if your substrate is acidic (such as peat moss).
 
Last edited:
azorahai you may be on to something with the PH flush and hot soil. They are in 7 gallon containers. I flushed through 2 gallons of ph'd water at about 6.2 to 6.4, my runoff kept measuring around 5.8 from start to finish, I was not seemingly making progress getting the runoff ph to move up at all. Is this what you would expect with hot soil? Just didn't seem like any more water was making much difference....2 gallons seems like a lot and it generated a good bit of runoff. At what point is too much water as far as flushing is concerned? 5 gallons? 10 gallons? any thoughts...
 
You must log in or register to reply here.
Back
Top