Greenleaf Nutrients

[McDee]

Is that burn? Or calmag def? Or too much daily light integral? Or still a mystery for you?

I am still learning how understand what my girls are telling me. I thought was calmag def, then thought was potassium not calmag. I was having it happen again. Then I saw a post about RH and watched video. Everything was matching video, I mean like same temps and RH just about. When it mentioned it having a toxicity and showed it, I saw what mine looked like. I said I am putting extra calmag in so it's taking to much like it says and having a toxicity. Did what it said to increase RH, lowered calmag from 8ml/gal to 3ml/gal. Lowered light intensity and its stopped so far in the last few days and growth has started again. So time will tell, text grow going to keep rh up and see if it happens again. But I think that's what it was, only thing that has work at all so...

 

[McDee]

That is only on bottom growth, new growth is clear need to feed tho. Was letting go a little to see if it worked before I feed much incase that's not it lol.

 

[lunarman]

I am still learning how understand what my girls are telling me. I thought was calmag def, then thought was potassium not calmag. I was having it happen again. Then I saw a post about RH and watched video. Everything was matching video, I mean like same temps and RH just about. When it mentioned it having a toxicity and showed it, I saw what mine looked like. I said I am putting extra calmag in so it's taking to much like it says and having a toxicity. Did what it said to increase RH, lowered calmag from 8ml/gal to 3ml/gal. Lowered light intensity and its stopped so far in the last few days and growth has started again. So time will tell, text grow going to keep rh up and see if it happens again. But I think that's what it was, only thing that has work at all so...

Sorry if I'm lazy and you posted this above, but what was your RH and what is it now? I have struggled with low RH before but didn't get a toxicity like that. Since I bought a big console humidifier my RH is higher and I notice plants look lusher only.

 

[McDee]

Sorry if I'm lazy and you posted this above, but what was your RH and what is it now? I have struggled with low RH before but didn't get a toxicity like that. Since I bought a big console humidifier my RH is higher and I notice plants look lusher only.

Was 53 and when my little humidifier runs out(16oz) goes down to 56-57, but 74% is the high end. Need to fill a few time a day. So much higher now. May still be a deficiency not 100% sure. Sure looks like calmag deficiency in pics cant find toxicity pics, although some say deficiency and excess calmag so may look the same. Still learning everyday hope that's it easiest fix.

 

[lunarman]

Was 53 and when my little humidifier runs out(16oz) goes down to 56-57, but 74% is the high end. Need to fill a few time a day. So much higher now. May still be a deficiency not 100% sure. Sure looks like calmag deficiency in pics cant find toxicity pics, although some say deficiency and excess calmag so may look the same. Still learning everyday hope that's it easiest fix.

Shit man that is high RH. For me low, is 15 percent. i try to run 40-50 and I chug about 4 gallons of RO water a day to get it that high. I don't think that is an RH issue @Mcdee but I can't say what is is either..... LOL. Sorry bro not much help.

I am dialing back my Megacrop this grow though and not using any calmag so far either. I'm liking it. I think MC makes me realize less is more, more than another other nute has to date. Also trying to water less during seedling phase and that is real tough to do, but I think I'm getting it. I just chucked out 5 plants out of 8 because they were too slow prob from over watering seedlings. I dropped 16 more beans yesterday and will be taking the best 8 of them. I'm at the point now where I'll germ double my capacity and cull the worse ones out. Reduce MC and calmag. And reduce watering. All reduce reduce reduce right now.

 

[McDee]

Shit man that is high RH. For me low, is 15 percent. i try to run 40-50 and I chug about 4 gallons of RO water a day to get it that high. I don't think that is an RH issue @Mcdee but I can't say what is is either..... LOL. Sorry bro not much help.

I am dialing back my Megacrop this grow though and not using any calmag so far either. I'm liking it. I think MC makes me realize less is more, more than another other nute has to date. Also trying to water less during seedling phase and that is real tough to do, but I think I'm getting it. I just chucked out 5 plants out of 8 because they were too slow prob from over watering seedlings. I dropped 16 more beans yesterday and will be taking the best 8 of them. I'm at the point now where I'll germ double my capacity and cull the worse ones out. Reduce MC and calmag. And reduce watering. All reduce reduce reduce right now.

I dont know but I do know that increasing rh and lowering calmag has been working so must be something to it????? I am going to go this route till it fails. May need to bump up to 5ml calmag cause do use ro water 3 may be a little low. Said 3-5ml/gal so started there. You aren't in a tent, may make a difference???? Only way I know how to find out is to test it out. Back to the lab if need be lol. Wish I could grow that many, just 2 at a time here.

 

[STILLSMOKIN]

I'm about 4 weeks into my first use of MegaCrop, but am unsure about how much to use.
I have both a top feed system, and a DWC system. The top feed is using two HLG qb-65s about 30 inches above the plants, and the dwc is using a platinum p-600 led (veg switch only), about 40 inches from the plants. Closer distances can be trouble in my experience during this growth stage.
My previous experience with other nute companies is that using half their recommendations is about right.
Although there could be a variety of different causes for some problems I'm having, I'd like to eliminate over/under feeding as a potential cause.
I'm presently feeding about half of what Megacrop recommends in both tents, with air temp = 76, ppm(500) = 300, res temp = 72 F, and pH = 6.2.
Both of my systems are heavily aerated with stones, and the plants are starting their 4th week.

What strength are other highly aerated dwc growers using?

Here's a mephisto forum stomper in the dwc tent.
It was transplanted from the top feed tent to the dwc tent 4 days ago. Previously it had looked much better, similar to the second picture.
View attachment 960849

Here's a picture of a mephisto white crack from the top feed tent. I'm bothered by the faint white streaks emanating from the central vein. Although I might be reading something into nothing, it seems reasonable that those whiter places are caused by a nitrogen deficiency from under-feeding, could get burned, and produce what the bottommost leaves look like in the first picture. But those bottom leaves in the first picture could also be from over-feeding.

View attachment 960853

Hydro does better with 5.8 ph. Also may want to check ph on drip system. Im running mephisto in dwc with ppm at 1500. I add water until i get it down to 800 then add back more nutes to hit 1500. That in turn swings ph fro 5.6 to 6.2. I do use hydrogaurd and that is a must also. But im 40days on same res with no issues other than needing it to stretch.

 

[Simplicio]

Here is a few pic I just took.

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I am not using MC this time(AN) and same issue. They started fine and just after I started to give stronger feed it started. Just keep getting worse then I lowered feed and raised rh and stopped. I also turned 1 of my autocobs off now have 2 going in my 2'x4'x5' tent.

I had a similar problem with 1st use of MC. Thought it was calmag deficiency, then was leaning towards a potassium deficiency. But I have a RH issue, you may too. What is your rh? I had mine around 53ish and just to low. Its forcing plants to transpire to much, which is taking in more calmag. I had increased my calmag because I thought I was having a deficiency when I was actually having a toxicity. I am havi g issue raising th, so 1 way to help if rh is low is backing off feed. I lowered feed added a humidifier and I can see its slowly getting better. New leaves are not showing same signs yet. It's been hot and ac just went off few days which maybe why I cant get rh up. I know you want rh higher in bloom but I never thought 53 was so low it was hurting them to that degree. Just learned about this on here from I believe @Think. Here is the YouTube video about it.

I've been a follower of the VPD chart for quite a while.
My RO water has about 10-15 ppm.

My real question is what fraction of GreenLeaf's recommendation is appropriate for a dwc system.

The consensus with other brands seems to be about 50%.

 

[McDee]

I've been a follower of the VPD chart for quite a while.
My RO water has about 10-15 ppm.

My real question is what fraction of GreenLeaf's recommendation is appropriate for a dwc system.

The consensus with other brands seems to be about 50%.

Ya, I just saw your bottom growth and saw what i had going on too. It's a good question, I would go with 50% and if need be go up. You may just have a calmag deficiency??? If rh is good and ph is good then may need calmag if not already. Just looked at mine and growth has continued so going to keep rh up until flower. I wish I had seen VPD sooner.

 

[pop22]

That's a magnesium deficiency add about 50 ppm more of cal/mag or epsom salts.

Here is a few pic I just took.

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I am not using MC this time(AN) and same issue. They started fine and just after I started to give stronger feed it started. Just keep getting worse then I lowered feed and raised rh and stopped. I also turned 1 of my autocobs off now have 2 going in my 2'x4'x5' tent.