Is this a magnesium deficiency?

[Heavily Medicated]

I use MC and have found that I have to add P/K during flowering. I have also ran into intermittent Ca def problems that is strain dependent I'm sure. I think you are experiencing P/K def problems from one cause or another. You do need to pH you soil to make sure that's not the problem, because adding more nutes to an already out of range soil pH will quickly make matters worse. I use the MC as my base nutes, and add P/K bloom boosters (Big Bud and Overdrive) as a norm, and add Ca/Mg as needed. I dose the MC by ppm, not gr/L or how the bag says. I use this for my ppm guidelines. These are ranges, but gives you an idea. Small plants need a lot less, XL plants need a lot more. Seedling - 300 to 600 ppm, Stretch - 600 to 900 ppm, Flowering - 900 to 1200 ppm.

 

[Haunts]

Ppms/Ec is highly important when it comes to feeding.. Too much of one nutrient can lock out others. The only way to have an idea of how nutrient rich your water is, is thru the ppm/ec. You can use plain water.. Just pour in enough to get back enough run off to check with the meter.

Thanks for this, can I just make sure I'm clear. I think I'm on about week 7 so when I measure my run off the reading should be 525 or is this what the ppm should be going?

 

[Proph]

Thanks for this, can I just make sure I'm clear. I think I'm on about week 7 so when I measure my run off the reading should be 525 or is this what the ppm should be going?

No prob. That ppm schedule is what I use to measure the ppm of my nutrient mix before I pour it into the soil. If it's 525 going in, it should be about the same coming out. If you have been using nutes with every watering, your ppms are probably in the thousands right now.

 

[Haunts]

If you have been using nutes with every watering, your ppms are probably in the thousands right now.

I'm guessing this is a little high then? Lol

 

[Proph]

I'm guessing this is a little high then? Lol

If I'm reading that meter correctly, that is saying your ppms are at 1960. So yes, I'd say that's high.. High enough to create lock a lock out due to excess nutes.

 

[Haunts]

If I'm reading that meter correctly, that is saying your ppms are at 1960. So yes, I'd say that's high.. High enough to create lock a lock out due to excess nutes.

Yeah that's how I read it as well. So from here do I just give water until the runoff ppm comes down or should I do a proper flush?

 

[Waira]

:smoking: Haunts, this is a peat based "soil", right? it might even be borderline soilless, depending on what all else is in there,....

From what I read here, it seems you have a major nute salt build-up in there, so a flush is called for; this is fine with peat based soilless, but not coco...
Use good water, low hardness if possible, and run about 2-3x pot volume through... you can check progress by collecting run-off every half gallon or so and measure pH and ppm... you can quit when it's down about that suggested 500+ppm mark... Flushing may not remove all salts equally well, some bind more to particles than others, so to restore some balance, last pour should have about 500ppm of nutes in it, leave out the SC for this,...
-- low 6's pH is good for this type soil...

This likely has caused an antagonistic lockout, and/or pH lockout if it off... Too much of a certain given nute can interfere with the uptake of another, even if there's no apparent nute burn overall,...
-- looks like Zn is getting locked out, and P too... some of the color burnishing might be normal expression from this strain, but it's also a symptom of P defc. (locked out or lack of)....

>>> mind what HM says above, look into getting a PK booster, something even ratio P:K or P biased for early-mid/late bloom, then ideally switch to a more K biased finishing bloom like their Bud Explosion..... K, S, Mn, are big players in aromatics, so stay fat on these, P isn't so important anymore at this later stage... The SC is also perfect for this, in fact, mind your total K inputs, look at ALL the sources going in; SC is loaded, BE heavy K, even MC is rich in it... Too much K and you'll be in the same jackpot again!
You will have to dial back the MC to up the ppm of other things, something that can kinda backfire if the other supplements don't have secondary and micronutes (BE and SC don't, BTW)..... If you reduce complete nutrition MC, you short on everything, so that's why I caution about using SC and BE... You may also consider a different PK booster, with more complete balances and not have to worry about this.... I do love SC, stay on that no matter what, just mind the K load it has....