Dialing In MEGA CROP for Auto's

[GeorgeCloney]

BTW with V1 I add 40 ppms of cal/mag. I'm switching to epsom salts though as the extra Ca is not needed.

Yup, 500-600ppm MC with 50 to 70ppm of epsom is what works best for me.
I may sub the epsom occasionally with calmag.
In which case I use 100ppm of calmag.
This is only done if the plant tells me its spoting on the leaves.
6.3ph.
And Bob is your uncle

 

[Examiner]

I use V3.0 MC in a reservoir, top drip to Rockwool. Starter cube into 4x4 block then onto individual uni slabs. 480w of QB,s 4x4 tent. Ph adjusted daily to 5.5-5.8 as a rule.

I switched to MC last grow and had problems, too much ppm and too much light.

This grow has been much much better and I'm about 7-10 days from harvest with no problems noted. I fertigate 2-12 times per day, depending on growth stage of plant. I use a concentrated solution of MC and RO water. Mix it to 4-500 ppms. 10 ppm start, maybe 50 ppm calmag on occasion, 450 ppm MC and 50-100ppm of bud explosion after she shows pistals.

I run a DLI of about 25 at the top of my plants. Any higher and I start to see leaf problems. Temp 78f, rh 50-65. 24 hour light cycle.

My plants are healthy and buds big and frosty. I acknowledge limited experience with this setup (been growing photos since 1999 tho) but this is what is working for me. Every environment is different, but in my case my problems were caused by too much MC and too high of led light intensity. Maybe it's the long light cycle, maybe it's the frequency of my fertigations with Rockwool, but if I ran the suggested 4g/gallon my plants would be fried.

File this in the FWIW category I guess. Good luck everybody.

 

[Greenleaf Nutrients]

Yup, 500-600ppm MC with 50 to 70ppm of epsom is what works best for me.
I may sub the epsom occasionally with calmag.
In which case I use 100ppm of calmag.
This is only done if the plant tells me its spoting on the leaves.
6.3ph.
And Bob is your uncle

the latest MC 1 Part is around 2.7% + Mg, so its much higher than previous and should eliminate the need for adding in extra Mg.

 

[terp182]

Thank you for replying to the thread!

Is around 550 ppm MC only good for flowering, or do you recommend added PK, and if so at what concentration?

the latest MC 1 Part is around 2.7% + Mg, so its much higher than previous and should eliminate the need for adding in extra Mg.

 

[HemiSync]

I'm not fussy however, anything between 500 - 560 is acceptable. I'll see what the new MC tests out to and post my solution results.

I am using the new 1 part version and use five gallon water bottles to mix the solution. I add 15g of MC to the five gallons and that usually hits right between 500-550 on the 0.5 scale. The water I use is distilled from my dehumidifier and is about 9ppm to start. As you have said, add nothing else. If I see a little mag deficiency then I foliar spray once a week with 7 grams of mag per gallon of water.

I start my all plants in a 3 gallon square fabric pot with Biobizz and perlite 70/30 that fits right into the autopot trays when ready. The pots are well saturated with biological additives and require no watering, while they are in the nursery tent, until they are put on the reservoir when the leaves start to overlap the pot and they get moved to the big tent. There they happily grow big and strong until harvest on the same 3g per gallon. Only times I have issues is when I let the reservoir drop below 6.0 pH and then the new growth will start to look twisted. Bump it back up above 6.0 and everything straightens out.

As for the naysayers on GLN, I call horseshit, cause just try and grow plants using Advanced Nutrients‘ calculator. You will burn them into the ground. Most nutrient companies you have to start at about 25% of what they recommend, so why all the hate on GLN. If people want to grow cannabis or any other plant, they need to learn to read their plants and feed accordingly in order to be considered a grower. MC is the easiest damn nutrient I have ever tried except for LOS, but we know what a chore it is to set that up correctly.

Your advice has saved my butt on a few grows. Not to mention, my mantra is never flush and my girls stay green till the end.

 

[MidnightSun]

DATA FYI:
Per 1 gallon of water
Subtracting my .02 EC water and using a jewelers scale to measure weight.

Mega Crop 1 part = .32 EC per 1g
(.32*1000/2) = 160ppm
Bud Explosion = .31 EC per 1g
(.31*1000/2) = 155ppm

So the website says 1g MC = 112.39 ppm or .224 EC
Per gram this would mean the mix i'm using is hot by 47.61 ppm or (47.61*2/1000) = .095 EC

***Its powder so your results may very***

 

[pop22]

We all have our way of doing things. Always looking to apply my KISS ( Keep It Simple and Safe ). I've been making a stock solution that I can just give a shake and pour into a measuring spoon, then take a ppm measurement.

DATA FYI:
Per 1 gallon of water
Subtracting my .02 EC water and using a jewelers scale to measure weight.

Mega Crop 1 part = .32 EC per 1g
(.32*1000/2) = 160ppm
Bud Explosion = .31 EC per 1g
(.31*1000/2) = 155ppm

So the website says 1g MC = 112.39 ppm or .224 EC
Per gram this would mean the mix i'm using is hot by 47.61 ppm or (47.61*2/1000) = .095 EC

***Its powder so your results may very***

 

[pop22]

A stock solution also ensures an accurate blending of the nutrients vs individual feedings.

 

[4d-Rock]

I also make up liquid concentrates in small batches. On top of giving a more consistent balance of nutrients, it’s Easier to work with and you don’t breath in the fine dust as much.

I usually put 25g MC with 250mL warm water. That way it is simple to measure, if a mix calls for 1g I can use 10mL. Id do it in larger batches but I don’t go through it super quick and I’ve had mold grow in it if sitting too long.

 

[Greenleaf Nutrients]

Thank you for replying to the thread!

Is around 550 ppm MC only good for flowering, or do you recommend added PK, and if so at what concentration?

you can try either one, there isn't an official rec. If you are having too much N issues, you can lower the MC dose, and sub it with the PK (0 Nitrogen).

A stock solution also ensures an accurate blending of the nutrients vs individual feedings.

Stock solution works well, you might get some small white Calcium particles locked up temporarily, but once you dissolve it into the final res they will slowly dissolve over 1-2 days time and be fully available to the plants.

Another solution is to take your bag and "blend/grind" it somehow, to get a uniform powder. If you do this, make sure to immediately move it to an airtight container since it can be more prone to clumping up.