[solista]

Hi,

This is a Cabeça de Preto auto, 66 days, 31 in flower and suddenly she turned yellow.

Soil too compacted like a rock, my second grow, first indoors.
Any help appreciated.

[solista]

Actually these pics are 3 days old, sorry . These are from yesterday. Thanks,

[mushroombrew]

Magnesium deficiency. See how the leaf veins stay darker green. You can really see it on the lower leaves. And stems get reddish in color

Nitrogen deficiency. Because there is also an overall light color.

You probably have a pH issue. Make a 1/4 strength nutrient solution. Use any "grow" fertilizer. Shit even miracle grow if your broke.

Then you need to adjust the pH. You're going to need a way to check pH. Test strips, drops or a pH pen?

Then use pH down to adjust the solution to 6.5. Pour three times the volume of the pot into pot. So a 2 gallon pot needs 6 gallons solution ok?

You will be flushing the salts out.

And doing a mild feeding at the same time.

The next watering go ahead and feed it full strength.

It will be a week before it needs more water.

The flush will super saturate the soil.

Dilute the original solution down to 1/8th strength to foliar feed. Use a sprayer with a fine mist. Spray the shit out of her. All over even under leaves. Twice, three times a day go for it.

Spray her for a few days. You will be feeding her through her leaves instead of roots.

After a couple days you may see salt build up on her leaves. She doesn't like that. Its like when you swim in the ocean. You get out and your all salty right? So you take a freshwater shower right?

OK so she's going to want a rinse every couple days too.

The leaves won't get better or worse. But she will grow some new bud leaves and they should be greener.

Ok get to work. Good Luck!

[solista]

Wow! Thanks for the prompt and ample answer!

My concern about Mg foliar spraying is the future´s buds taste. I´m growing organic.

A few hours ago I applied a 3 days old worm castings and bat guano tea. I´ve had done a flush before but due compact soil it stays quite wet for a long time. And at this point of flowering I won´t mess if this rocky soil.

Yes, I had PH problems because a crappy PH meter. By now soil is at 7.0. I´ll try to lower it with fresh coffee grounds.

Cheers,

[mushroombrew]

You don't have to spray mag specifically. Flushing with mild fert at 6.5 is the answer. Use lemon juice maybe? Coffee grounds will take too long I think.

Don't worry about residual ferts/flavor. Your plant is shutting down. So foliar feed her.

If you don't your terps will be shit. And you'll have bad tasting herb anyway.

[solista]

How she is looking now..

[jedi5891]

I was gonna say the same as mushroom brew that it looks to be a magnesium or I thought maybe calcium deficiency.
Awhile back I kept getting this same problem starting around week 2/3 and 4 of bloom and it was only after incorporating Cal-Mag into my feed that it stopped happening.
Never folar spray after 3 or 4 weeks into bloom and always keep your medium healthy using enzymes and regular flushes to leach out salts and mineral deposits.
Peace
Namaste

[solista]

Thanks jedi5891. I believe that I´ll harvest it in 10 days, so will just give water to her.
This is my second growth, first indoors and learned a lot. Quite confident that the next will be much better than this one.
Best,

[mushroombrew]

Originally Posted by jedi5891

I was gonna say the same as mushroom brew that it looks to be a magnesium or I thought maybe calcium deficiency.
Awhile back I kept getting this same problem starting around week 2/3 and 4 of bloom and it was only after incorporating Cal-Mag into my feed that it stopped happening.
Never folar spray after 3 or 4 weeks into bloom and always keep your medium healthy using enzymes and regular flushes to leach out salts and mineral deposits.
Peace
Namaste

Why do you say to never foliar spray after 3-4wks? As long as you intermittently spray pure water nothing negative happens.
I foiliar spray heavy feeding indicas often in flower. Their nitrogen requirements can be huge. And foliar is a way to give them a quick
dose.

[jedi5891]

Originally Posted by mushroombrew

Why do you say to never foliar spray after 3-4wks? As long as you intermittently spray pure water nothing negative happens.
I foiliar spray heavy feeding indicas often in flower. Their nitrogen requirements can be huge. And foliar is a way to give them a quick
dose.

My view is that I dont like the thought of spraying my meds with nutes and chemicals etc directly onto what I'll consume. You may rinse some off with water but I bet not all.
Other reason I tend to not folar much other than neem oil, is that plant starts to rely on taking food in through the leaves leaving the stomata open all the time and not taking as much up through the roots. Plants evolved to feed through the roots not the leaves.
Peace