Dark spots and yellowing

Bilgerat

Member
2) Indoor/Outdoor?: Tent/closet space. DR60 II tent ventilated out of the top via 170 CFM In-line fan with carbon filter. Using 2 Kessil H350's, Deep Purple and Magenta (not sure if it's important but I just added the Deep Purple last week so I'm not sure if adding a new light mid-growth has caused stress of some sort) Humidity kept in control with an ultrasonic humidifier. Also added an Exhale co2 bag.
3) Watering schedule?: was once a week or so towards the beginning now it's every 4 days as they show signs of thirst within that time period
4) Medium?: Fox Farms Ocean Forest regrettably (very hot at first)
5) Stage?: Vegetative, they were planted late September/Early October

Temps stay above 69 and hover between 70-75. Humidity is always kept 40% or above usually 40-50%. I pH a large gallon jug of R/O water (0.17 PPM) to as close to 6.5 as I can get it (usually 6.4 or 6.6).


These plants were burnt to the point of almost needing pulled due to the heat of Fox Farms Ocean Forest. I flushed them twice (11/20 and 12/29) with Clearex and they exploded into new growth. Unfortunately they've been overtaken by a deficiency of some sort. I should've started nutes the second that the flush was over but I was worried they had already suffered enough burn and wanted to see improvement on the burn. I have added no new nutes since the flush aside from yesterday (added a tablespoon of epsom salts per 1 gallon to their watering due to suspecting this deficiency to be magnesium in nature but I'm a first time grower and have no actual experience in catching deficiencies). I have some Cal-Mag on the way and have not given them any magnesium foliar feedings yet.

Pics galore:

IMG_1693.jpgIMG_1694.jpgIMG_1695.jpgIMG_1696.jpgIMG_1697.jpgIMG_1698.jpgIMG_1699.jpgIMG_1700.jpgIMG_1701.jpgIMG_1702.jpgIMG_1703.jpgIMG_1704.jpgIMG_1705.jpgIMG_1706.jpgIMG_1707.jpgIMG_1708.jpgIMG_1709.jpgIMG_1710.jpgIMG_1712.jpgIMG_1713.jpgIMG_1714.jpgIMG_1715.jpgIMG_1716.jpgIMG_1717.jpgIMG_1718.jpgIMG_1729.jpgIMG_1730.jpgIMG_1731.jpgIMG_1732.jpg

I'd greatly appreciate some help on diagnosing this deficiency so I can give them what they want and get onto flowering :)
 

Coho

Well-Known Member
Calmag is good and needed for RO..looks like P but you should have plenty in the soil????? N too... odd. they look like def flowering plants. How are checking pH? Oh and what makes the tent? Some chitty ones off gas.
 

dbdweller

Active Member
Check this site out. They break it down into detail.
Shows.. Mitro,Mag,Potass,.
Did it start in the lower older leaves first? Potass has the same signs. Mag u tookk acre of? How long has it been sice you used the Epson salt? By the way that to me was the best thing to use for Mag
This site is right on time and i have been doing it for a while @50 lol Its a marijuan Encyclopedia
Good luck and i am curious what works for you.

http://www.cannabis.info/USA/library/6880-cannabis-nutrition-macro--and-micronutrients
 

Bilgerat

Member
I see its Secret Jardin..it should be fine. You feed anything?
I am using a Hannah instruments digital pH meter to pH my water. I pH the water usually adding 2 drops of pH down an 1 drop of pH up or so to 1 gallon of R/O water before the meter gets close to 6.5, usually 6.4 or 6.6. I have fed them no nutrients so far except for Epsom salts dissolved in their last watering which was a couple days ago (1/11).

I'm happy with the tent, it ventilates well. My main priority now is to stop this deficiency. Do you think I should kick them into a flowering light cycle now or wait for the Cal-Mag?
 

Bilgerat

Member
Check this site out. They break it down into detail.
Shows.. Mitro,Mag,Potass,.
Did it start in the lower older leaves first? Potass has the same signs. Mag u tookk acre of? How long has it been sice you used the Epson salt? By the way that to me was the best thing to use for Mag
This site is right on time and i have been doing it for a while @50 lol
Good luck and i am curious what works for you.

http://www.cannabis.info/USA/library/6880-cannabis-nutrition-macro--and-micronutrients
Thank you dweller, I'm going to read that entire article through, definitely breaks it down.

Yes it started on the lower/older leaves first. I'm not sure if the mag deficiency is completely taken care of as I have only fed them the Epsom salts as of a couple days ago (1/11). I've given them no nutrients at all since their 2 Clearex flushes which seems to be a mistake on my end but I feared nute burn so much I wanted to see if it was all out before giving them anything. The FFOF soil was very hot and needed 2 flushings.
 
Top