SOS! calcium? mg? I dunno

[Anasazi]

Hello. Thought I'd post here and see if anyone can help me figure this out. I have some gigantic mephisto sour cracks going atm but I've started to run into problems in flower. My grow is RDWC and 2 of the plants are showing similar symptoms while the 3rd is showing completely different symptoms.


I'll try to list the relevant info.

I keep ph between 5.7-6, majority of the time it's at 5.8
Current day is 56
Ppms have been about 800 - 950 (0.5) I've just started to lower ppms closer to 800 range as they recently started to rise.
RH was between 55-70. I just got a dehumidifier so i'm trying to keep it at 50 now.
Spiderfarmer 4000 led = 450 watts but running at 80%. 2nd led = 240 watts but running at like 40 - 50%
Using megacrop 2 part, epsom salts and advanced nutrients calmag extra.
water = tap about 50 ppm
I change out the water about every 7-9 days.


I didn't start using the calmag until I saw spots increasing and I didn't want to up the part b megacrop because of the nitrogen. I also tried to up the epsom salts from 5gr per gallon to 10-15 but it doesn't seem to be helping.


This is the plant that I thought had calcium problems. This is toward the top of the plant.




This is the 2nd plant, This is also toward the top of the plant






Picture of whole plants (D54)

 

[Anasazi]

=(

 

[draxcel]

Not a doctor,let me Try that.
If the problem Is showing only in the top,It should not be a mobile nute but an immobile one.Also mobile deficiency start from bottom and they go up the ladder to the top leaves.I am pretty sure you are encountering a non mobile deficiency or issue,so se are talking about some Cal-mag deficiency or inappropriate rate of absorption because of the symptoms

 

[St. Tom]

@Mañ'O'Green may be able to advise @Anasazi also @Nosias runs the same megacrop hopefully they can help you but apart from that on your leaves they look super happy

 

[Mañ'O'Green]

You have thrown your pot out of balance. 5g Epsom salt per gallon is too much. 800 PPM is too high for autos.

Also using AN - Cal-mag is not a good idea. You probably do not need any extra unless you are using RO or have cut your part B really low.

I have a spreadsheet for the 2 part down load it here:

404 File Not Found - Jumpshare

The file you are looking for does not exist.

jmp.sh

Just fill in the boxes and keep everything in the green. I found I needed to add K in late flower to keep the nitrogen down .
The starting water PPM calculates the calcium content at about 28% of the starting water. This can vary.

 

[Anasazi]

You have thrown your pot out of balance. 5g Epsom salt per gallon is too much. 800 PPM is too high for autos.

Also using AN - Cal-mag is not a good idea. You probably do not need any extra unless you are using RO or have cut your part B really low.

I have a spreadsheet for the 2 part down load it here:

404 File Not Found - Jumpshare

The file you are looking for does not exist.

jmp.sh

Just fill in the boxes and keep everything in the green. I found I needed to add K in late flower to keep the nitrogen down .
The starting water PPM calculates the calcium content at about 28% of the starting water. This can vary.

View attachment 1341120

I tried your schedule before and it didn't work well for me. I think my plants just became too big and they just weren't happy when I followed your lower ppm philosophy. Maybe something changed with flower? I guess I can try to go that low again and see what happens. Thanks

 

[Mañ'O'Green]

I tried your schedule before and it didn't work well for me. I think my plants just became too big and they just weren't happy when I followed your lower ppm philosophy. Maybe something changed with flower? I guess I can try to go that low again and see what happens. Thanks

In DWC you must "top off" the nutrients daily to keep the PPM in the proper range. I used a top off tank that had a 25% strength of what I was using in the reservoir and it was fed to the reservoir through a float valve that continually fed the reservoir. This kept the PPM in the range I wanted.

PS. some strains can use a higher PPM. The important part is keeping all of the nutrients in the proper balance.