Nute burn? Organic soil

[marijuaman]

Hey all! These plants are 47 days old and suffering from what I think is nute burn. Medium is OF/perlite, with just plain PH 6.3-6.5 tap water apart from a single top dressing. I had some low soil PH issues in the first 3 weeks, so I decided to top dress with build-a-flower around week 3 in attempt to balance PH and give a pre-flower boost. I think this made the soil too hot and what started with burnt tips is slowly progressing. Do you think the plants will ride it out if I keep going with plain water, or do I need to take measures to remedy the issue

 

[Badfinger]

Hopefully a more experienced grower then myself will step in, but my first thought would be a deficiency, after 47 days I would think your nutes in the soil are pretty much used up. It resembles a mag/zinc/potassium issue IMO. On the other hand, is your water treated with chlorine or fluoride.

 

[marijuaman]

Hopefully a more experienced grower then myself will step in, but my first thought would be a deficiency, after 47 days I would think your nutes in the soil are pretty much used up. It resembles a mag/zinc/potassium issue IMO. On the other hand, is your water treated with chlorine or fluoride.

This may be the case. I held off on adding anything else after the top dress since leaf tips started burning, and buildaflower said it contains everything needed to flower. Should I be feeding with bloom nutes now?

Not sure how treated my water is, but I leave it out for a day or two before watering.

 

[Bruce Campbell]

Below is the info the infirmary crew usually asks for.

I think you got a good deal of the info in the OP, but take a look and see if there's anything else you're missing.
_______________________________________________________________________________________________________________
Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

 

[marijuaman]

Problem:

Leaf discoloration, burning tips and edges

Medium/grow method:

Fox Farms Ocean Forest, 3 gallon fabric pots

Feed and supplements used:

Build-A-flower top dress at week 3

water source:

Tap water PH’d down to 6.3-6.5 with citric acid powder

Strain/age:

Sour Stomper, Double Grape, Samsquanch OG - 47 days

light used:

20/4 light schedule. LED Panel similar to spider farmer SF2000.

Climate:

~80f, 40-55% RH

Additional Info:

Symptoms have been appearing slowly over the past 2 weeks. Started with the burnt looking leaf tips, then progressed to leaf edges browning.

 

[Bruce Campbell]

From other post in New Grower's Q&A forum:

This could be the issue. Would Mega Crop at 9-6-17 NPK work?

I'm suspecting K deficiency because OF doesn't have much to start and their feed schedules are usually pretty high in K to compensate.

The build-a-flower or another organic top dress may take a while to kick in, so you could try supplementing with a synthetic feed in the short-term.

Megacrop is pretty high in Ca (8%), though. I'd look for another option that's mainly K with not much else to limit the impact on your overall nute balance.

 

[St. Tom]

@Mañ'O'Green will log in later and will take a look for you and may be able to help you out I'm a coco grower myself but just dipped my toe lately into water only soil

 

[marijuaman]

From other post in New Grower's Q&A forum:


I'm suspecting K deficiency because OF doesn't have much to start and their feed schedules are usually pretty high in K to compensate.

The build-a-flower or another organic top dress may take a while to kick in, so you could try supplementing with a synthetic feed in the short-term.

Megacrop is pretty high in Ca (8%), though. I'd look for another option that's mainly K with not much else to limit the impact on your overall nute balance.

Thank you for the suggestion. Is there any particular easily available fert you’d recommend for my situation? Preferably organic, but it doesn’t have to be.

 

[St. Tom]

Thank you for the suggestion. Is there any particular easily available fert you’d recommend for my situation? Preferably organic, but it doesn’t have to be.

when I grew with eco life soil and my plants looked hungry I used to top-dress with Ecothrive Life-Cycle Organic Soil Amendment maybe look into that but as I said I haven't much experience with soil besides my last run and I'm using sohums live soil on 3 now

 

[Bruce Campbell]

Thank you for the suggestion. Is there any particular easily available fert you’d recommend for my situation? Preferably organic, but it doesn’t have to be.

I'm assuming it's a K deficiency (or K lockout from high Ca) - but I think we're all waiting for ManoGreen to take a look and confirm He's usually on later at night.

Assuming it is, organic / top-dress sources of potassium include greensand, kelp meal, and wood ash (or even banana peels). Buildaflower has some kelp meal, so it may be providing / releasing some over time, but I'm not sure how much and how quickly.

I'm more of an inorganic / salt-based fertilizer grower. Based on what's in my cabinet, I'd use Cultivation Nation / Grow formula, which is 2-1-6 with no Ca and 0.5% Mg. I'd start with maybe 1/4 - 1/2 tsp per gallon and slowly increase to see if the symptoms improve or stop progressing.

As a side note, I'd check out MoG's nutrient tutorial (here) - it gives some great background.