Calcium Deficiency? Did I do this right?

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heykevo

Member
Do these look like calcium deficiency?

Growing in coco, 3x3, 4 plants, elev8 megasonic, 300w LED light. I'm 24 days after the flip.

I messed up my nutrient batch by forgetting to adjust the PH. The EC was good, PH was 7.8. I fed the plants to 20% runoff and then realized oh crap. That night I adjusted the PH and let it settle and my brain said "go low" to offset the high, so I brought it down to 5.5 and fed again to around 50% runoff. After taking a moment to think about it I realize I should have just adjusted as normal and fed a good bit to run off the high PH, but mistakes were made.

The next night I open up the tent and this had started. I didn't notice it too much, wasn't terrible, and again dumb me forgot that my entire batch of nutrients was only 5.5ph, so I kept feeding from that same 5.5ph batch.

Three days later this is what I have and I realized that I'm an idiot.

So I went ahead and did a full flush 100% runoff with 6.5 ph plain water, let it sit for an hour. I mixed up a nutrient batch at 6.5. I'm reading that calcium upticks better at a higher PH. I'm going to bring that 6.5 down to 6.2 tonight, the 6.5 was just kinda for a recovery day. I doubled the cal-mag for this batch or 5mm per gallon instead of 2.5.

So I think I didn't really think it through initially and now I think I'm overthinking it.

Anyone have any insight on if I did this well or if I should have done / should do something differently?
 

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Billybill

Member
What are you running your ec at? Anytime I have a problem in coco I just mix up a normal batch and flush with it. I run about 1.8 ec and 6.2 ph. Seems to work out after a couple of days. If my ec gets a little high I get a little lock out. The runoff ph is always way low and don’t seem accurate but the ppm seems pretty accurate. Most of my plants have low runoff ph but it’s never been a problem after about 10 runs. I always do about 5 times the water as my pot size.
 
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heykevo

Member
Billybill said:
What are you running your ec at?
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My current batch I'm running for a couple days is at 1250 to not put too much in, but I'll be going to 1500 by Thursday for flowering. I was 1100 early veg to 1300 late veg then 1400 early flower and I'll be ramping up to 1750 by ~2 weeks from now. Everything has been going golden with these numbers for this strain so far.

I don't check my runoff EC or PH unless there's a problem. If everything looks good and I know I'm putting in the right numbers I don't see a reason to test my runoff. With that said I will be testing it tonight because it's 24 hours after I did the flush.
 
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heykevo

Member
MickFoster said:
Never flush with plain water.
If you must flush due to salt build up........use a light nutrient solution.
Feed at least once a day to substantial run off.......with a pH around 6.0.
Never use plain water.
Never let the coco dry.
Good luck
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Why never flush with plain PH balanced water if I plan on using a nutrient solution with substantial runoff within an hour? Just curious the science or reasonings there.
 
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Billybill

Member
Everyone does it a little different but ppm and ec are just measurements of the same thing. There are different scales of ppm: if I start getting over 1000 ppm or 2.0 ec I start getting some yellowing from a little lock out. I have a pump that auto feeds. If my level in the reservoir gets low then I don’t get enough runoff and it builds up fast. I do a hand watering every week to make sure I’m not getting build up. If that high of an ec works for you then run with it. It don’t work for me. Every environment is a little different and some people do thing I wouldn’t get away with but it works just fine in their set up.
 
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heykevo

Member
Billybill said:
Everyone does it a little different but ppm and ec are just measurements of the same thing. There are different scales of ppm: if I start getting over 1000 ppm or 2.0 ec I start getting some yellowing from a little lock out. I have a pump that auto feeds. If my level in the reservoir gets low then I don’t get enough runoff and it builds up fast. I do a hand watering every week to make sure I’m not getting build up. If that high of an ec works for you then run with it. It don’t work for me. Every environment is a little different and some people do thing I wouldn’t get away with but it works just fine in their set up.
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Your EC is higher than mine.
 
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heykevo

Member
Billybill said:
I guess it is. It’s hard to follow you when you’re saying ppm numbers and calling it ec numbers. Good luck.
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I'm just using microsiemens instead of millisiemens, didn't realize this was so confusing. I'll say 1500μS or 1.5mS from now on for clarity.
 
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ec121

Well-Known Member
heykevo said:
Why never flush with plain PH balanced water if I plan on using a nutrient solution with substantial runoff within an hour? Just curious the science or reasonings there.
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It places osmotic stress on the plant. Plants uptake nutrients and water via the roots through separate mechanisms; it is not like the plant drinks the nutrient solution like as if the roots were a straw.

The plant has water inside the roots and the plant has water outside the roots. When the water outside of the roots (i.e., the saturated coco) has a high EC, the plant has to produce sugars so that the concentration of dissolved solids inside the roots is higher than the concentration of dissolved solids outside the roots in order for osmosis to take place. When plain water is introduced, the plant then has to quickly convert those sugars to starches otherwise the plant will take in too much water.
 
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ec121

Well-Known Member
heykevo said:
I don't check my runoff EC or PH unless there's a problem. If everything looks good and I know I'm putting in the right numbers I don't see a reason to test my runoff. With that said I will be testing it tonight because it's 24 hours after I did the flush.
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Symptoms due to an ongoing problem take a while to show up on the plant, so if you're testing your runoff and it's regularly 1.1 higher than your inflow, you can correct the problem before any symptoms show itself on the plant and the plant will be happier.

But I'm guessing dude was asking you what your runoff numbers are because specifically you do currently have a problem that is expressing itself visually.
 
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ec121

Well-Known Member
heykevo said:
I'm just using microsiemens instead of millisiemens, didn't realize this was so confusing. I'll say 1500μS or 1.5mS from now on for clarity.
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Well, the problem is at least half the people in need of help in the newbie forum use PPM and call it EC and vise versa and don't know the two are very different, so it's helpful if people wanting to help are 100% sure that the person asking the question is really talking about PPM or EC.

When someone says, "My EC is 1200" people in the forum have to ask themselves "does this person mean microsiemens or is his pen really reading 1200 PPM?" Combine that with the fact that 99.9% of people using an xxx or xxxx number are always talking about PPM, people are inclined to ask or assume PPM.

You may think it's silly because you're using milli and micro correctly, but when you see terms being conflated with one another day after day, it's not so silly to ask for clarification before you give advice that might torch someone's plant because you assumed something.

Conversely, if someone says, "My EC is 1.2" then there is only one interpretation of this number.
 
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heykevo

Member
ec121 said:
Well, the problem is at least half the people in need of help in the newbie forum use PPM and call it EC and vise versa and don't know the two are very different, so it's helpful if people wanting to help are 100% sure that the person asking the question is really talking about PPM or EC.

When someone says, "My EC is 1200" people in the forum have to ask themselves "does this person mean microsiemens or is his pen really reading 1200 PPM?" Combine that with the fact that 99.9% of people using an xxx or xxxx number are always talking about PPM, people are inclined to ask or assume PPM.

You may think it's silly because you're using milli and micro correctly, but when you see terms being conflated with one another day after day, it's not so silly to ask for clarification before you give advice that might torch someone's plant because you assumed something.

Conversely, if someone says, "My EC is 1.2" then there is only one interpretation of this number.
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Yeah I get it I just wish people had actually asked instead of just assuming I’m saying PPM numbers. They just started talking PPM to me. No worries. I’m understanding the lingo now. Thanks for the advice.
 
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