Autoflowering plant issues. Need advice please. Rep and such for help!

Hey guys, your friendly neighborhood Chodesman here:

I'm having some problems with my plants. I believe it is some sort of Calcium/Magnesium issue.

These are autoflowering strains. The strains affected are Afghan Kush Ryder, Little Cheese, and Chronic Ryder. Everyone else is fine.

Everybody is a month from seed in Fox Farms Ocean Forest soil. The plants are in 1 gallon pots and were started in the FFOF. I've been using Fox Farms Big Bloom for two weeks, (micronutrient) and Tiger bloom for a little over a week when pistils appeared. Half strength and then a little over half strength for the TB a few days ago. I'm also using Molasses every other watering and Cal/Mag to supplement the Fox Farms regimen. Watering with ph lowered tap water that I let sit for a few days.

That's what I don't understand. maybe it's a PH thing? Too much nitrogen? Can nitrogen lock out other nutes? I had leaf twisting a few weeks ago, a sign of ph issues and began PH testing my water. It was around 7.8 so I've been lowering it with vinegar in to the 6.0 region and that problem seemed to correct itself but now I have this shit. It's affecting 3/9 of my plants so it's somewhat of an issue. Necrotic patches are forming and there are different colors of spotting. It's affecting older leaves. It looks like calcium to me but it was getting a full dose of Cal/Mag at less than a month before this cropped up and it got a dose yesterday and got worse.

Should I flush with PH'd water, wait a few days and fertilize with my usual regimen?

What the fuck is going on here fellas?

I'm a novice grower. I have a few grows under my belt but I can use a second opinion, or multiple opinions from the weed gurus of RIU.

To repeat: my plan is to flush the affected plants tomorrow with ph'd water that I've had sitting out a few days and fertilizing a day or two later with full strength and molasses.

Bump.........

It definitely looks like a ph problem to me. This is causing one or several nutrients to be locked out. I would suggest that you stop using vinegar to lower the PH of your water. That could be your problem right there. Also, go easy on the fertilizers. Changing nutrients, combining fertilizers and/or over-fertilization can cause salt buildups in your soil which can disrupt your soil's PH balance.

After I let my water sit out for a few days it reads over 8.0 on my ph tester. There's no way around lowering the ph. I gave them a flush so I hope they improve. I'm going to use 2/3 strength nutes from now on.

Use ph down to adjust ph, vinegar is nasty. Definetly have ph issues. Should not need cal/mag using tapwater, only need if using RO or rain water. Flush with 6.0 ph water, and test runoff at end of flushing. And I have to ask why would you put molasses in your soil ?

Yea I have the same exact problem with my autoflower plants right now. Cant really figure out what it is.

you feed plants molasses to give microbes food. the microbes feed the plant. fox farm is full of salt witch kills the mycorrhiza fungi so I don't think molasses are doing you any good. At first glance it looks like a calmag issue. lock out of some kind. is that going to be the final pot I dont think you should transplant autos they do better in the same pot from start to finish.

stop using molasses you don't need that stuff till the end anyway

The guy at the hydro store tried to get me on that PH up and down but I'd rather use the vinegar for frugality reasons. Actually I'm going to start using lemon juice. About 1/4 teaspoon is supposed to lower ph from 7.4 to 6.3. I gave the affected plants a flush, any input on when I should fertilize them?

They are in their final pot. Besides that they are rather healthy. 31 days from seed. You can check out my thread in my sig. Only 1/3 of my plants have this issue so I'm concerned if it will start on the others.

You can fertilize right after you flush your plants because they wont have any nutrients in the soil.