Autoflowers, how much cal-mag?

[90Gizmo]

Seems that I always have plant problems starting when I start giving bloom nutes. I think I'm getting along with using half nutes but should I be giving the full dose of cal-mag instead of half? What's "normal" for Cal-mag? I'm seeing little brown spots on the leaves and I was running the pH high fives low sixes before bloom. So I think she's asking for higher pH and more calcium, just wondering what's a normal dose and... I think I've only been doing cal-mag every other water. Thanks!

 

[Bluey]

Growing outdoors in soil I never ever had problems with deficiencies.

Indoors under these lights big time problems and always after the flip.

50% nutes is nowhere near enough for my plants. The sativas are happiest around 75% mid bloom but the hybrids need more. One of my hybrids is 50% covered in leaf problems caused by deficiencies, mostly rust, but it was also the fastest growing and has the tallest buds. It looks like it should be dead but it's still going strong.

I am typically slow to act on seeing changes in my plants which is a mistake...I never had this problem in the past so I thought 'it's only one leaf" or whatever and it will be fine, which was the case outdoors but not under lights. I now realise if I had acted earlier when seeing the slight changes I'd have bigger healthier buds

I'm currently using 1ml/ltr Cal/Mag with 90% nute strength but I need to start dropping it very soon.

You will need to adjust depending on VPD lighting & genetics, one solution will not fit all.

 

[90Gizmo]

Maybe I'm at 75% too in that I'm giving half bloom and quarter grow.. up until last grow I'd gone cold turkey on grow nutes when I switched to bloom but last time I kept going with 1/4 grow nutes and that seemed to help. maybe I should go 75% bloom, cut or taper the grow and give full Cal-Mag every time ( instead of 1/2 Cal-Mag every other time I'm doing now.) because the cal mag has nitrogen too.. So I'm seeing little brown spots. The big picture doesn't show it but I was looking closely cause I saw little white spots on the leaves. That turned out to be from the ultrasonic humidifier. I'm glad that humidifier season is over.

 

[Bluey]

It might pay to give it not only cal/mag but also PK. I aim for pH6.2 in flower and adjust minor depending on what I consider the deficiency. With autos I am guessing less margin for error. Photos you can slow them down and correct. I know zip about growing autos and a few others here are experts at it judging from some of their pics.

 

[Going2fast]

20/20 autos grow on the big side. Just finished up trizzlers and she got hungry for pk about two weeks into flower. I would start feeding them full strength cal mag a long with 3/4 strength nutes.

 

[90Gizmo]

Them I'll try it. Last feeding wasn't enough so she needs more.