Sick Plants? Nitrogen and Phosphorous deficiency in a SCRoG.

[Bilbo Scrogins]

Hey all,


I've recently been struggling to keep fan leaves green and dancing. I'm wondering if she's sick as I'm seeing: the leaf tips down, slightly stunted growth, and yellowing present. I believe there are multiple deficiencies present, but I need your expertise to be sure !


For example, this leaf is displaying what I believe to be both Nitrogen and Phosphorous deficiencies. Those are some recently-ish dead leaves from the problematic plants. This is an example of how the problematic leaves appear on my flowering plant. Also note how [the problematic leaves are encroaching upon] the SCRoG canopy as lower leaves die, leaving higher leaves susceptible to the above-stated deficiencies.


I flushed the plant tonight with 10 gallons of water, and gave it a feeding of Big Bloom (in hopes of addressing the Nitrogen deficiency) and CalMag . I'm out of ideas at this point; and don't know if the flush and feeding was a good call to do or not. I'm delivering full nutrients in conjunction with this setup:


* Veg time: 2 Months
* Pots: 5 Gal Smart Pots
*Flowering Time: 2nd week (8 days) (Week 6 on Fox Farm Feeding Schedule)
* Strain: Big Bud X White Widow
* Evaluation: Nitrogen and Phosphorus Deficiency
* Nutes: Fox Farm Trio (2nd week)

1. Fox Farms Big Bloom
2. Fox Farms Tiger Bloom
3. Fox Farms Grow Big
4. CalMag Supplement

* Tent Size: 4x4x6.5
* Lights: x2 900watt Mars 2 Hydro
* Soil: FFOF x Perlite 30%
* Temps: 74-82 degrees F
* Humidity: ~40%
* Airflow Intake: Fresh air intake coming from vents inside 6-inch 400 CFM inline fan
* Airflow Exhaust: 6-inch inline fan through Carbon Filter exhaust
* Watering: 6.5 PH Once per Week (Alternate Water, Feed every 3 days)
* Feed: 6.5 PH Once per Week (Alternate Water, Feed every 3 days)

I'm also growing a [Super Silver Haze in this SCRoG] which has some strange coloration around the tip and leaf. This may be where feeding has spilled onto the leaf? Also of note, [this plant is not as lime green around the nodes] as the other Super Silver Haze linked. [I'm seeing the under-canopy yellowing and showing deficiencies on both of my SCRoG strains at this point].

Thanks for reading guys, I could use a hand to point me in the right direction!

[LINK TO THE ALBUM OF PICS WITH ISSUES, TOKE ON!]

 

[Bilbo Scrogins]

Link to album of this SCRoG grow; somewhat relevant to topic.

 

[Bilbo Scrogins]

Bump

 

[al70]

I'm not a soil grower but it looks like nitrogen toxicity from your pics, they have a very dark green look about em which is a sign of N toxicity, goodluck

 

[Bilbo Scrogins]

I'm not a soil grower but it looks like nitrogen toxicity from your pics, they have a very dark green look about em which is a sign of N toxicity, goodluck

Does this mean I should give it less of the nutrients highest in N? At the end of my flush last night, I fed it a full dose of Fox Farms Big Bloom, which has the highest N of my nutes. Did I mess up?

I thought it was showing a N def by the yellowing of the leaf as seen here.

I also thought I had a Phosphorus def because of the browning seen in some of the lower canopy leaves.

It could be N toxicity though, I agree that symptoms are similar. Just not sure which it is.

 

[Bongstar420]

NPK in flower for most stuff will have a ratio somewhere around 2-3-3 and a tds ppm around 900-1600ppm

I gather you NPK is closer to 1-1-2

Big Bloom alone would make your stuff look like that in days if there isn't a reservoir of other nutes in the media.

Does this mean I should give it less of the nutrients highest in N? At the end of my flush last night, I fed it a full dose of Fox Farms Big Bloom, which has the highest N of my nutes. Did I mess up?

I thought it was showing a N def by the yellowing of the leaf as seen here.

I also thought I had a Phosphorus def because of the browning seen in some of the lower canopy leaves.

It could be N toxicity though, I agree that symptoms are similar. Just not sure which it is.