First Grow - one of the autos starting to show signs of?

[LaFlamaBlanca]

HI Guys,
First grow, been lurking around for awhile now, inf act AFN is the reason that i decided to try Autoflowers!

One of my seedlings is showing some signs of being sick, have not been able to narrow down the issue, is it Calcium def, Phosphorus def, PH lockout etc? I am kndof lost at what it might be any suggestions will be greatly appreciated.

Media - Mother Earth Coco Coir
Dry amendments - GreenGro Natures Pride Veg, Bloom TM-7 (by BIOAG micro nutrients)
Water - Well water PH’d to 6.8 (water comes out of the tap at ~7.3 PH level)
Auto - Great White Shark
Light - “1K watt” Sunraise (160 watts actual) 18/6 on/off
Pot - 3gal
Temps 70-80ish humidity ~50% in grow tent
Seedling is 13 days old

I started the seed in the 3 gal pot in the coco amended with the organic dry amendments listed per the instructions on the packages.
Watering with water that was PH’d to 6.8 i say “was” because i PH’d the water when i first filled the bucket but have not since, same water has been in the bucket for 13 days now, been watering with turkey baster.. could this water PH change over time? should i check every watering?

Last night i believe i may have over-watered because this morning the larger leaves were drooping downward a bit but this evening i noticed these light spots showing up on the lower leaves, is there a way to help this girl?

 

[LaFlamaBlanca]

HI Guys,
First grow, been lurking around for awhile now, inf act AFN is the reason that i decided to try Autoflowers!

One of my 13day old seedlings is showing some signs of being sick, have not been able to narrow down the issue, is it Calcium def, Phosphorus def, PH lockout etc? I am kndof lost at what it might be any suggestions will be greatly appreciated.

Media - Mother Earth Coco Coir
Dry amendments - GreenGro Natures Pride Veg, Bloom TM-7 (by BIOAG micro nutrients)
Water - Well water PH’d to 6.8 (water comes out of the tap at ~7.3 PH level)
Auto - Great White Shark
Light - “1K watt” Sunraise (160 watts actual) 18/6 on/off
Pot - 3gal
Temps 70-80ish humidity ~50% in grow tent
Seedling is 13 days old

I started the seed in the 3 gal pot in the coco amended with the organic dry amendments listed per the instructions on the packages.
Watering with water that was PH’d to 6.8 i say “was” because i PH’d the water when i first filled the bucket but have not since, same water has been in the bucket for 13 days now, been watering with turkey baster.. could this water PH change over time? should i check every watering?

Last night i believe i may have over-watered because this morning the larger leaves were drooping downward a bit but this evening i noticed these light spots showing up on the lower leaves, is there a way to help this girl?

 

[Arthur]

PH can fluctuate with time and exposure. Unless your running Nectar for the gods nutrients, your pH is way to high for coco. 5.8 to 6.2.

I run nectar in coco and run high pH (6.4 to 6.8) but my nute line is calcium based, not salt based.

 

[LaFlamaBlanca]

The nutrients i am using are organic dry amendments by GreenGro the average PH of their products is between 6.6 and 6.8, dont believe they are salt based. Should i lower the PH to 5.8-6.0, will that harm "good" stuff in the nutrients/media?
I am basically trying to mimic the growing style of Mr Canucks grow, but i am unable to get the same exact nutrient brand he uses (gia green) as I am in the US. So i found some organic nutrients with similar NPK ratios for veg and bloom.. do the spots on the leaves look like they could be caused by "lockout" due to improper PH levels?

oh when i listed the nutrients, i should have listed the TM-7 separately
GreenGro Natures Pride Veg and Bloom
TM-7 (organic micro nutrient) just to make up for some of the stuff not listed in natures pride

 

[Waira]

-- your treating the coco like a true soil, and that's going to bite your butt eventually,.. coco is a specialized "soilless" medium, with several do's and don't's, and behaves differently from true soil... many aspects about it are closer to hydro/DWC than soil... it has some peculiar cation exchange properties (CEC), it's a major Ca hog, Mg to a lesser extent, which usually requires more Ca-Mg than usual... Coco will bind and hold the Ca ions until it's sated, or buffered (not pH related buffering in this case) then it will give-and-take,... I would caution you about trying to mirror another's grow methodology unless they are working directly with you, and are running things nearly apples-to-apples across the board...
Since you're going organic, the usual synthetic nutes routine isn't necessary, so there's that in your favor,.... but to keep the nutes available, you need to run the pH lower as mentioned, and be using inoculants especially! the soil herd is your workforce in there, breaking down, converting, and cycling the organic nutes into forms the plant can take up; pH management is critical in this, so you need to get the gear to test in-pot pH pH, a pH probe (not a meter, liquids only there)... the Accurate 8 is a good unit for this,...
.... normally you don't pH adjust organic nutes,... have you tested the nute solution for pH before feeding?
Get us closer pics mate, I can't tell what's what on the leaves very well,... likely it's Ca defc though,....

 

[LaFlamaBlanca]

@Waira @Arthur
Thank you guys for taking the time to take a look and offer some help/suggestions, here are some more pics, since i first posted she has grown a bit more, i did lower the PH down to 6.0 for her last watering. I took these pics this morning Day17 before watering...(shes looking a little thirsty). the spots dont seem to have affected any other leaves so far and the other plants i have growing in the same amended coco are doing great 2 photos and one other auto (well as far as i can tell)
soil PH probe is on its way
I do understand that coco is not a true soil and there can be issues with ca/mg etc.. I have been reading/watching a few growers growing in coco with organic dry amendments and seemed like an interesting way to grow..
I have not tested the "nute solution" for PH as they are dry powder form, the manufacturer states that the PH is between 6.6-6.8

 

[Arthur]

New stuff looks good from what I can see, tag me again when you can check the pot.
coco is a fantastic medium, makes diagnosis and treatment pretty easy, but... get good equipment (ph meter ppm) and keep an eye on the readings, then great things happen!

 

[LaFlamaBlanca]

@Arthur @Waira
Thanks again for your advice, I saw the recommendation on the PH meter by Waira after i already had one ordered (delivered today), I am not sure about the accuracy of the meter i have. PH meter is reading just below 7 (closer to 7 than 6). might need to get the Accurate 8 meter, looks much nicer..
what PH should i see in the amended coco?
I watered again with water PH'd to 6.0 this morning.
The new growth does not seem to be showing any signs of the spots seen on the older leaves. Do the spots look like calcium def?
Should i look into getting some cal/mag as well? an organic version?
thanks again!!

 

[Waira]

I've tested those cheapo skinny probes against the A8, and they suck,... Use the A8 right, store it properly, and it'll serve you well! Mine is a hero
..OK, spots look odd, and may not even be nutritional related,...low down near the medium level like this, it possible to get a minor pathogen infection, not uncommon,... you can snip that leaf off even,..let the cut dry out though before further watering...

 

[GardenofWeeden64]

Yup, dry amended coco/perlite is always gonna like a pH of 6 is, I usually swing between 5.8 and 6.3 with no issues at all.