What’s up with this? Yellow and brown tips on new growth

[Weedman_automagic]

I went away over a week ago. Gave a good top dressing. Plant has only got water from the autopot only since. Last couple days the leaves have gotten yellow/brown on the tips of some of the new growth.
supersoil grow. Other 2 plants in the tent are older and look good.

 

[Heavily Medicated]

Might be burn, what ppm you been feeding at? Did it start right after a res change?

 

[Weedman_automagic]

Organic dry amendments. Didn’t load them up too heavy before I left but maybe it’s a burn?

 

[WendellBerryKush]

Organic dry amendments. Didn’t load them up too heavy before I left but maybe it’s a burn?

Maybe cal/mag deficiency

 

[Arthur]

Tips look like burn, but the twisted growth is typical of a calcium deficiency. Guessing she burned from the top dressing, and needs a good cal/mg injection.
Cal/mg is almost always needed with canna indoors, even more so if your under led. Some strains I end up at 300% of the calcium/magnesium of others, but I'm never without.

 

[Weedman_automagic]

I have general organics cal mag on hand. Will this plug up my lines in An autopot set up? Should I only top feed it in?

 

[Arthur]

I have general organics cal mag on hand. Will this plug up my lines in An autopot set up? Should I only top feed it in?

I'm guessing this won't play well in a reservoir system. I pulled this excerpt from another forum.

 

[Weedman_automagic]

Thanks co

I'm guessing this won't play well in a reservoir system. I pulled this excerpt from another forum.View attachment 1142192

Thanks for the help. I am gone for another handful of days. If they survive I will try a foiler spray with the cal mag solution and top water some in as well. By then hopefully the top dress won’t be harming as much. I had a guy on another site tell me that the burnt ends are nute lock out from high ph due to all the high ph stuff in the top dressings. I do have lime in the soil so I am hoping it’s buffering the ph well enough.

 

[Arthur]

Sounds like the other guy is guessing. If your really interested in finding out, and it would be a good idea to get in practice if your going to mix soils... Slurry test your soil. Take a couple tablespoons of soil, halfway between plant and bag edge, maybe an inch or 2 down. Mix with an equal amount of your regular water, let set about 5 minutes and test the pH. I usually do this 3 or 4 times a grow, testing pH and ppm. Helps to see when they're underfed, overfed, locked out, etc.
Soil pH should be mid 6s.

 

[Weedman_automagic]

Sounds like the other guy is guessing. If your really interested in finding out, and it would be a good idea to get in practice if your going to mix soils... Slurry test your soil. Take a couple tablespoons of soil, halfway between plant and bag edge, maybe an inch or 2 down. Mix with an equal amount of your regular water, let set about 5 minutes and test the pH. I usually do this 3 or 4 times a grow, testing pH and ppm. Helps to see when they're underfed, overfed, locked out, etc.
Soil pH should be mid 6s.

I got my buddy to go over and give a cal mag foliar feed and then dump the rest in the top of the pots. Got my fingers crossed. I don’t really have money in the budget for an expensive ph pen. Think I can get away with ph strips or test liquid? Do the 20 dollar ph pens on amazon actually work?