Dialing In MEGA CROP for Auto's

[terp182]

Still having issues dialing in the MC on my first auto grow. After a 5 gal nute update, following their instructions, i.e. 4.5g/gal MC, .5 g/gal PK, .5g/gal epsom salts, all the leaves near the top of all three plants turned yellowish. There was a bit of nute burn at 650 ppm so I diluted to 590ish. I've been trying to titrate up nutes the past few days to correct it - slowly adding cal/mag since brown spots started popping up, and bringing it back to under 600 ppm. But I'm running out of patience with dialing in this nute. This was supposed to be the "easiest" part of the equation, and I've learned a lot already, but was really hoping to get these gd nutes dialed in by ~Day 50. Pretty sure I'm switching to something else for the next grow. Here's my progress on the three so far. I just added more cal/mag today, at 1.25 ml/gal. The new brown patches on the CDLC are worrying me - that's a first. I checked for root rot last night - no signs of brown roots around the base. I also took the lights down a little until I get these nutes corrected a bit. Any thoughts on something I'm missing? The CDLC and DG red/brown marks on the new growth are from the last few days. The ZE has had those Cal deficiency rust spots ongoing, but she's gotten yellower with the new feed.

 

[Proph]

Still having issues dialing in the MC on my first auto grow. After a 5 gal nute update, following their instructions, i.e. 4.5g/gal MC, .5 g/gal PK, .5g/gal epsom salts, all the leaves near the top of all three plants turned yellowish. There was a bit of nute burn at 650 ppm so I diluted to 590ish. I've been trying to titrate up nutes the past few days to correct it - slowly adding cal/mag since brown spots started popping up, and bringing it back to under 600 ppm. But I'm running out of patience with dialing in this nute. This was supposed to be the "easiest" part of the equation, and I've learned a lot already, but was really hoping to get these gd nutes dialed in by ~Day 50. Pretty sure I'm switching to something else for the next grow. Here's my progress on the three so far. I just added more cal/mag today, at 1.25 ml/gal. The new brown patches on the CDLC are worrying me - that's a first. I checked for root rot last night - no signs of brown roots around the base. I also took the lights down a little until I get these nutes corrected a bit. Any thoughts on something I'm missing? The CDLC and DG red/brown marks on the new growth are from the last few days. The ZE has had those Cal deficiency rust spots ongoing, but she's gotten yellower with the new feed.

I hate to see posts like this... But just reading your feeding dosage, it's a dead give away that there is a lock out in your medium due to excess nutrients.. 9 times out of 10, adding calmag is NOT the answer.. When a plant shows a deficiency, it does not mean to just add more of that nutrient. It means find out why.. Too much calcium will lock out magnesium making it unavailable to the plant. Too much magnesium will lock out calcium, making calcium unavailable to the plant.. Just for calcium and magnesium alone, you've used 3 different sources.. MC, calmag, and epsom salt. That's way too much already.. The few people who I've seen get a handle on MC don't follow the instructions on the bag.. They use the feed calculator on the MC website.. Those dosages are much lower than what the bag suggests.. Keep in mind that all feed charts are suggestions, not directions. Regardless of which product you choose to use, understanding deficiencies, how they happen, what they look like, and how to correct them, is something that must be learned. It's not the lights, or the environment.. It's simple over feeding.

 

[terp182]

I appreciate the feedback. Trying to understand the deficiencies is precisely what I’m attempting to do by posting in this thread, specifically after adding calmag to the res.

I used the feed calculator on the site as instructed, with the exception of dialing back .5 g/gal of MC and replacing with PK.

I also understand that you can lock out one with too much of the other, but can’t get non-yellow plants with just MC.

So you think I should flush with appropriate ppm (550ish?) MC only?

 

[Mañ'O'Green]

Why did you add the Epsom salt? Too much Magnesium is locking out the calcium Mega Crop needs no additions except Bio-stimulants.

 

[Mañ'O'Green]

I appreciate the feedback. Trying to understand the deficiencies is precisely what I’m attempting to do by posting in this thread, specifically after adding calmag to the res.

I used the feed calculator on the site as instructed, with the exception of dialing back .5 g/gal of MC and replacing with PK.

I also understand that you can lock out one with too much of the other, but can’t get non-yellow plants with just MC.

So you think I should flush with appropriate ppm (550ish?) MC only?

I need to see the whole picture:

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics! Turn off the grow lights.

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

PH in the root zone:

Strain/age:

light used:

Climate:

Additional info:

 

[terp182]

Why did you add the Epsom salt? Too much Magnesium is locking out the calcium Mega Crop needs no additions except Bio-stimulants.

View attachment 1252847

Because I followed some other random forum poster’s suggestion/recipe (which of course I can’t find now) that MC would benefit from more mag. Ugh. I did turn off the flow to the pots though so they haven’t been fed with it yet.

 

[terp182]

Thanks - here's the info!

(copy and paste)-->

Problem: Balancing cal/mag in my res with MC (**I could have fucked this up with adding .5g epsom salts and 1.5 g/gal botanicare calmag, per another replier)

Medium/grow method: 50% coco, 20% perlite, 20% roots organic (i know this is off - i'll be all soil/perlite next time)

Feed: MegaCrop 4.5 g/gal, PK Boost .5 g/gal, epsom .5 g/gal,

water source: Municipal PNW super clean 22 ppm verified

PH in the root zone: 5.9

Strain/age: 48/49 days from sprout

light used: Mars Hydro SP-3000 @ 20 inches

Climate: 75 degrees/50% RH consistent

Additional info: First grow, I'm struggling with finding safe baselines for MC to make healthy looking plants

Pics: Are in my post above. All are flash but I had to have the lights on for the closeups.

Thanks for any insight you might have!

I need to see the whole picture:

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics! Turn off the grow lights.

 

[Mañ'O'Green]

Thanks - here's the info!

(copy and paste)-->

Problem: Balancing cal/mag in my res with MC (**I could have fucked this up with adding .5g epsom salts and 1.5 g/gal botanicare calmag, per another replier)

Medium/grow method: 50% coco, 20% perlite, 20% roots organic (i know this is off - i'll be all soil/perlite next time)

Feed: MegaCrop 4.5 g/gal, PK Boost .5 g/gal, epsom .5 g/gal,

water source: Municipal PNW super clean 22 ppm verified

PH in the root zone: 5.9

Strain/age: 48/49 days from sprout

light used: Mars Hydro SP-3000 @ 20 inches

Climate: 75 degrees/50% RH consistent

Additional info: First grow, I'm struggling with finding safe baselines for MC to make healthy looking plants

Pics: Are in my post above. All are flash but I had to have the lights on for the closeups.

Thanks for any insight you might have!

You are so lucky to have such a good source of water! Whos PK are you using? You talk about balancing you reservoir when you are in media I don't get it? Last but not least You have neither soil or hydro and this is a problem as well.

Are you running your lights 24/0? if not how are you keeping your temps and RH so steady?

 

[terp182]

Thanks! I agree on my good fortune with the water.

The PK is the green leaf Bud Explosion.

Regarding the res, I’m using autopots to bottom feed the MC.

I realize the medium is problematic (it was a bad audible I made at the last minute), but am treating it as a hydro since it’s mostly coco/perlite.

Lights are 20/4 actually. I’m sure the temp drops to say 69ish when they’re off. Otherwise the AC Inf controller and minor fan leaf pruning has kept RH in a pretty narrow window. Temps may vary from say 69-79, over the course of the whole grow. Controller is set to 80 degrees max (despite a CO2 bag being in there) and RH to 50 during flower.

You are so lucky to have such a good source of water! Whos PK are you using? You talk about balancing you reservoir when you are in media I don't get it? Last but not least You have neither soil or hydro and this is a problem as well.

Are you running your lights 24/0? if not how are you keeping your temps and RH so steady?

 

[Mañ'O'Green]

Ok I have a more complete picture. I would top flush with PH 6.2 water to 50% run off then follow right away with 2g MC per gallon PH 6.2 to a 50% run off along with recharge or any other Mykos etc at half strength with the MC, Kelp, humic acid. Discard all of the run-off. Then refresh your reservoir with 3g/gal MC + 1g/gal Bud Explosion PH 6.0 PPMs about 550 total.

There is a lot of damage to the plants that will not recover. Do not worry about that now. If our strategy works the plants will put on a few new Fans.