Possible nute deficiency? Help please (Pics)

[laxbro]

First time growing in coco.

Leaves started showing signs of yellow spotting.. Any clue what it could be? Using Canna A + B and Rhyotonic right now.. Not sure what Ph levels are.. Room stays at 73 Degrees and 53% humidity.. Only showing spotting on about two fan leaves of two different plants..

 

[BigGreen]

First thing, GET A PH METER

 

[stoned40yrs]

You would really have to be lucky to complete a grow in coco without a ph meter or GH drops to test your ph and keep it between 5.5 and 6.3. Those GH drops aren't spendy and you want your water/nutes to test out at a piss yellow color.

 

[carson]

Laxbro, how much of the a & b and rhyzo are you using? How often are you watering? It looks like you're using a drip setup. When did you transplant into these containers?

 

[Granger2]

What's your water like? -granger

 

[HHULKK]

Did you by any chance splash some nute water on them? It could be some burning/bleaching from your nutrient solution.

 

[HHULKK]

Also it is a good possibility that your plants need a bit more food. I'd bump it up AFTER you've checked your ph to make sure they're in the appropriate range to feed. It could be that your ph is off and not allowing uptake.

 

[WonderWoman]

could possibly be a windburn after seeing the location of the fan

 

[WonderWoman]

edit: after noticing you don't measure your ph at all, I'm starting to think it has something to do with that.

 

[laxbro]

Stoned40years - Going to pick up my ph meter tmrw. I invested roughly $1,500 in my setup, pretty silly of me not to pick up one of those at the beginning! I will be sure to test and post results..

Carson - I am currently using 12 mL's of rhyzo per gallon and 8 mL's of A + B per gallon. The timer is setup to water once a day, ten minutes before the lights turn on in the morning. I've picked them up directly after watering and late in the day and they never seem to look or feel too dry.. Would you suggest water in more often? They were transplanted into these containers a little over a week ago.

Granger2 - I am using distilled water.. Would you suggest otherwise?

HHULKK - I was just considering that idea as well.. Some of the rez water did get splashed on the leaves.. But no way to tell if that is the problem or Ph until I get a meter..

WonderWoman - Me too! I'll be posting ph levels as soon as possible.. Simplest way to adjust that is just ph up / down?

 

[laxbro]

All of the seeds are Turbo Bud Autoflowering, besides the feminized Jack Herer. I've heard mixed opinions on trimming some of the fan leaves on auto flowering plants but it was getting so bushy I had to give it a shot! I will be posting ph readings as soon as i get the chance!

 

[laxbro]

Just got my hands on some paper ph tests until i can get my hands on a digital meter tomorrow.. Its showing that the ph level is between 5.9 - 6.1 :[

 

[HHULKK]

The ph sounds in the suitable range and overall your plants look happy. I'm bettin' on that nute water is what caused the spots.

 

[stoned40yrs]

Just got my hands on some paper ph tests until i can get my hands on a digital meter tomorrow.. Its showing that the ph level is between 5.9 - 6.1 :[

You're good. Although I don't trust those strips at all. If you see the GH drops when you get your ph meter pick some up also. They cost about $6. ph meters go out of whack and have to be calibrated all the time so you need 4.0 and 7.0 calibration solution. The drops will never let you down and I use them to confirm what the ph meter says. What brand coco are you using? Your plants look great.

 

[laxbro]

HHULKK - I'm thinking that's the problem as well.. Stay posted over the next few days to see if we can see any change!

Stoned40yrs - I just googled what GH drops are and can't find anything on them.. Can you explain further what they are and where they can be found? I am using Canna Coco Coir. I think my plants are looking pretty damn good for my first run at this as well..

Any other tips and suggestions are welcome! I'd love some input on using distilled water, as I am doing so myself right now.. All other suggestions and comments are welcome, I won't take offense to anything

 

[HHULKK]

I believe the GH drops stoned is referring to is the ph test kit here:
http://generalhydroponics.com/site/index.php/products/maintenance/ph_buffers/ph_test_kit/
The kit is a must just for a more "manual" but reliable way to check your ph and also have reference for if your meter is reading correctly. Of course it only changes to specific color but the colors denote a ph range. piss yellow seems to be the appropriate color for the right ph range in hydro or coco more specifically.
Distiller water I would say is the same or similar to RO water so it's very pure. If I remember correctly, the canna site calc bases their feeding chart on .2 Ec tap water and you would be starting off with 0ec distiller water. I have heard some supplement cal mag as a result. Not sure if its necessary though.

 

[stoned40yrs]

Whats wrong with your tap water? The right amount of cal/mag between tap and base nutes is real important in coco. #1 thing to worry about. IMO. You started out with the right amount because your Canna coco comes charged with it.

 

[laxbro]

HHULKK - Thanks for clarifying!

40yrs - Honestly, I haven't done any research on my tap water. What could I do to test the quality to see if it would be suitable for my grow? What levels of cal/mag would you suggest for growing in coco? Sorry for bombarding you with all these questions. Just a curious new grower that is trying to learn the true science behind this! So any way you could break things down for me would be awesome

 

[stoned40yrs]

Like HHULKK said: because you are using distilled water that has no cal/mag you might need to add some when using canna A&B. Testing your tap with a ec-ppm meter would work. Another valuable tool in coco. Go post a question in the nutrients and fertilizers forum about if you need to add cal/mag with Canna A&B using distilled water in coco.. Might get a answer quicker.

 

[HHULKK]

If I recall correctly, adrift was using canna a&b with RO and he was using cal mag plus @ 2ml/gal. He however was doing a semi recirculating dtw where he reused some of his runoff from his feeds. I'm pretty sure he used cal mag when he mixed his weekly res' and only topped off with base nutes when he reused his water. Taking from all this, he used cal mag @ 2ml/gal which I believe is about .2 Ec as the canna calc suggests for tap. Please anyone that uses canna or is more familiar with adrifts feeding regime correct me if I'm wrong.