Calcium Deficiency??

[tbake4420]

PuravidaC : Are you also using Cogos a and b?

[PuravidaC]

No, Fox Farm trio. I posted the same question a couple of days ago, with photo, and got zero responses. A little disappointing as this is supposed to be a forum to help with growing... I had the same issue with last auto grow and I used very little nutes with no cal/mag on that one so I am at a total loss with what is going on! Gonna go back to growing photos. Never had any issues with photos! 😁

[Mr.furley]

PuravidaC, can you give a link to your unanswered thread?
Remember you can tag someone to ask for help including Nebula and Sirius

[tbake4420]

I contacted Cogos via email and they responded right away. This is the advise I received:

We have seen this with promix before and Cogos Original. The next two feedings feed with PH 5.5 water and no nutrients. Then go back to feeding Cogos but only feed at 5 ml per gallon each part. And then they asked if I was on the "dark red part A formula?

I asked for the reasoning behind their advise and have not yet received a reply.

Basically they are just advising to flush for 2 feedings, correct?

My question is, won't the situation just repeat itself? Should I be flushing every 2-3 feedings of nutrients?

[Mr.furley]

Water+nutes+calmag.
Water+calmag.
Repeat.

[Flockshot]

When a company tells me that they have known problems when growing in Pro-mix, I would take that as advise to not use Pro-mix with their products.

[Mr.furley]

Agreed Flockshot, I haven't seen many positive benefits to Pro mix just people with problems in the last year, I'll stick with coco.

[tbake4420]

OK will give that a shot, do you think 5 days in between watering is to long. They are in 5 gal plastic pots

[Mr.furley]

I believe in letting the cannabis plant decide when it needs water/water nutes.
Dry medium in pot
Lite when you lift it
Even a little drooping with the leaf
In their life cycle it will change so it is important to be responsive to them but not over loving or neglectful.
From what you have told us, it sounds like you have a good grasp watering practice just need to correct the plant nutrition needs and build up.
If I could, I would suggest fabric pot for your future, very helpful with air circulation to roots and easy to tell when the pot is wet/dry.

[Mr.furley]

Also, it wouldn't kill them to go a extra day without just not neglectful.

[Flockshot]

When your pot is bone dry, weigh the pot.
When your pot is fully saturated, weigh the pot.
Half way between those two numbers is the correct time to water, in my humble opinion.
If you weigh the pots for a few watering's, you will get used to the 'heft' of the pot.
Folks say water when the pot is 'light', so this is how I determine what "light" means

[Flockshot]

Those PPM's are off the chart and the PH is on the very low side.
The plants will utilize pretty much all minerals adequately at PH 6.0 in hydro/coco/pro-mix.
As the PH gets lower it is more difficult to utilize some minerals. A few of minerals that drop off quickly are Phosphorous, Calcium, and Magnesium when and PH gets lower. The low PH makes it more difficult to utilize the minerals, even though the are available in the medium.

You asked if anyone had any ideas, so here it goes.

Pro-mix is tough to flush. It holds so much water that it takes tons of water and then they don't dry out so the roots could be oxygen deprived,(this is why I stopped using it)
Again, no expert here by any means, but I would flush with plain 6.0 water (perhaps starting out with 6.5) until you are at 6.0 (or close to it) coming out the bottom at under 1000 ppm.(EC 1.4)
I no longer believe in RO water.
I have absolutely no knowledge about your nutrient brand.
There may be something wrong with your PPM meter
I believe that your plants have all the minerals they need to be healthy, and more, but the plant is not able to utilize the minerals that are available to it.