Mag deficiency?

danks.for.asking

danks.for.asking

Well-Known Member
This is my first grow in coco. I purchased a brick of coco, washed it, and buffered it with cal mag. Seeds sprouted in about 48 hours and now I'm on week 4. I'm feeding them about 500 ppm of GH Flora nutrients and cal mag ph'd to 5.8. What am I missing? Temps are right at 70. Humitity varies from 50 to 60%. They're being fed everyday with runoff. I have one plant that is mixed with soil because I ran out of coco, and its surpassed all of the others, and it was started 2 days later. The 2 in the back are Alaskan purple autos and they seem to be mostly fine. The long and lanky one in the middle is a Peyote Wifi(seems to be a little more sensitive to feeding, even more than the autos), and the two in the front are cheese. The cheese on the right is the one on soil, and its thriving. No issues with that one. Ill provide additional info and photos if needed.
 

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coreywebster

coreywebster

Well-Known Member
danks.for.asking said:
What temp should i aim for and why should the temp be higher for LED?
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70s on the low side for any grow but specifically with LED we aim for 80, they lack the IR HID lighting has and thus leaf temp is more directly related to air temp, transpiration slows down and with it nutrient uptake, which will be better at higher temps.

Also it looks like the plant in the middle (where light is most intense) is worse.
Another thing you can do is reduce your light hours, but that would be my last step if growing autos

Get your temps up and it should go away.
 
danks.for.asking

danks.for.asking

Well-Known Member
coreywebster said:
70s on the low side for any grow but specifically with LED we aim for 80, they lack the IR HID lighting has and thus leaf temp is more directly related to air temp, transpiration slows down and with it nutrient uptake, which will be better at higher temps.

Also it looks like the plant in the middle (where light is most intense) is worse.
Another thing you can do is reduce your light hours, but that would be my last step if growing autos

Get your temps up and it should go away.
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Ok thanks. The main reason i was keeping my temps down was because with higher temps, i get more humidity, but ill get a dehumidifier. The middle plant as been a runt from about a week after sprouting.
 
C

CannaCountry

Well-Known Member
Here's an easy way to at least eliminate some guess work: stop adding CalMag, and just spray them for a few days with Epsom Salt...see if they green up. If it were me, unless they were showing a Ca shortage and an Mg shortage, I would not be giving them CalMag. There are other ways to add each element by itself (Calcium Nitrate and Epsom Salt). Trying (3) different strains on your first coco go, probably isn't helping either, especially if some are more sensitive than others. Never the less, that's water under the bridge. Good luck friend.
 
danks.for.asking

danks.for.asking

Well-Known Member
CannaCountry said:
Here's an easy way to at least eliminate some guess work: stop adding CalMag, and just spray them for a few days with Epsom Salt...see if they green up. If it were me, unless they were showing a Ca shortage and an Mg shortage, I would not be giving them CalMag. There are other ways to add each element by itself (Calcium Nitrate and Epsom Salt). Trying (3) different strains on your first coco go, probably isn't helping either, especially if some are more sensitive than others. Never the less, that's water under the bridge. Good luck friend.
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I'm definitely dealing with a little regret. I was wanting to be a perfectionist, while beign inexperienced. The reason i was giving calmag was because my water is filtered and it definitely doesnt have it.
 
C

CannaCountry

Well-Known Member
Don't regret learning... I wasn't pointing a finger at you, just sharing things that I've learned along the way. There's no need to give something to the plant, that it doesn't need. This often causes lockout of other things the plant does need, so the idea is to give what the plant needs / wants, but just that, and that was all I was getting at. Oddly Ca and Mg shortages will happen together, hence why CalMag is there to start with. However, this isn't always the case, and regardless, spraying the Epsom Salt will give you pretty quick results, or not, which can then get you moving in either the right direction, or in a different direction. In terms of having multiple strains going...don't kid yourself if you don't think I've (and thousands of others) done the same damn thing, very early on, before I fully understood...it happens, we learn...no regrets friend. Good luck.
 
danks.for.asking

danks.for.asking

Well-Known Member
CannaCountry said:
Don't regret learning... I wasn't pointing a finger at you, just sharing things that I've learned along the way. There's no need to give something to the plant, that it doesn't need. This often causes lockout of other things the plant does need, so the idea is to give what the plant needs / wants, but just that, and that was all I was getting at. Oddly Ca and Mg shortages will happen together, hence why CalMag is there to start with. However, this isn't always the case, and regardless, spraying the Epsom Salt will give you pretty quick results, or not, which can then get you moving in either the right direction, or in a different direction. In terms of having multiple strains going...don't kid yourself if you don't think I've (and thousands of others) done the same damn thing, very early on, before I fully understood...it happens, we learn...no regrets friend. Good luck.
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How much Epsom salt should i use per gallon for my foliar spray? I'm still struggling trying to get my temps up too. I never thought i would have a problem keeping my temps higher haha. Turning my exhaust fan off raises the temps easily, but then im dealing with humidity in the 80's(yikes). Should i just get a small space heater to but near my inlets? I only have the one inline fan and i rely on the negative pressure to exchange the air right now. I uploaded a picture of a tester from bag seed that was doing very well, but i trashed it when i got my legit beans. Mistake number one it seems...
 

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C

CannaCountry

Well-Known Member
I can only tell you that I use basically 1 gram of Epsom per gallon of feed, however, it's always in my daily feed, I don't spray it. I would almost bet the package of Epsom will have some guidance in terms of how much to use in a foliar spray. Otherwise, I might try half a gram per gallon and see how it works. Sorry I couldn't be anymore specific. Perhaps a dehumidifier is your answer...it will lower your RH and help to heat the room some. Just a thought. And yeah, that was a nice looking plant..but hey, we make choices.
 
danks.for.asking

danks.for.asking

Well-Known Member
CannaCountry said:
I can only tell you that I use basically 1 gram of Epsom per gallon of feed, however, it's always in my daily feed, I don't spray it. I would almost bet the package of Epsom will have some guidance in terms of how much to use in a foliar spray. Otherwise, I might try half a gram per gallon and see how it works. Sorry I couldn't be anymore specific. Perhaps a dehumidifier is your answer...it will lower your RH and help to heat the room some. Just a thought. And yeah, that was a nice looking plant..but hey, we make choices.
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Everything is looking much better after raising the temps. I also started to vary my ph from 5.8 to 6.2 or so since i read mag uptakes better at closer to 6.
 

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