JWM2
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This is easy. Your rate of transpiration changed with the new light. LEDs put off less ambient and infrared heat thus lowering your leaf and ambient temps. This causes the plant to transpire less and therefore the nutrients remain locked in the growing medium inaccessible to the plants roots.
This is a common issue when switching over and takes some adjustment to get right. It’s easy to over compensate and create a situation where the environment becomes too dry and you’ll see a wild swing from not enough nutrients to nute burn.
This is where a VPD monitor comes in handy. You may notice that you’ll need more humidity for the plants to be happy otherwise you’ll need to cut back feeding in order to compensate. The easiest thing to do is to get the right humidity for the plant to be comfortable and not make other unnecessary adjustments to compensate.
It really comes down to providing them an ideal environment and since your source of light changed the environment changed drastically as well. With LEDs you want higher ambient room temp which raises the leaf surface temp and higher humidity which will keep transpiration in check. Once these are fixed you’ll notice that your plants will grow as expected again.
I run at 80-85 degrees ambient with about 60% humidity. This puts my VPD in the 1.4-1.6 range in flowering. In veg I like a lower VPD which requires either lowering the ambient temp or raising the relative humidity. In veg I shoot for 1.1-1.4 kpd.
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This is easy. Your rate of transpiration changed with the new light. LEDs put off less ambient and infrared heat thus lowering your leaf and ambient temps. This causes the plant to transpire less and therefore the nutrients remain locked in the growing medium inaccessible to the plants roots.
This is a common issue when switching over and takes some adjustment to get right. It’s easy to over compensate and create a situation where the environment becomes too dry and you’ll see a wild swing from not enough nutrients to nute burn.
This is where a VPD monitor comes in handy. You may notice that you’ll need more humidity for the plants to be happy otherwise you’ll need to cut back feeding in order to compensate. The easiest thing to do is to get the right humidity for the plant to be comfortable and not make other unnecessary adjustments to compensate.
It really comes down to providing them an ideal environment and since your source of light changed the environment changed drastically as well. With LEDs you want higher ambient room temp which raises the leaf surface temp and higher humidity which will keep transpiration in check. Once these are fixed you’ll notice that your plants will grow as expected again.
I run at 80-85 degrees ambient with about 60% humidity. This puts my VPD in the 1.4-1.6 range in flowering. In veg I like a lower VPD which requires either lowering the ambient temp or raising the relative humidity. In veg I shoot for 1.1-1.4 kpd.
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damn,this is what i was searching for... im in veg right now,so i need more humidity? its 40% atm,and how high should i hang my light (mars hydro TSL2000)? do i need to flush them or just raise humidity,temps and keep going? and there is no way that they adapt to its new conditions? i mean they will get worse and worse if i dont change conditions they had before (i mean humidity and temps,not light)? i threw out humidifier because i didnt have more space in closet and it went from 60% to 40%.
Yes this too! LolThis is easy. Your rate of transpiration changed with the new light. LEDs put off less ambient and infrared heat thus lowering your leaf and ambient temps. This causes the plant to transpire less and therefore the nutrients remain locked in the growing medium inaccessible to the plants roots.
This is a common issue when switching over and takes some adjustment to get right. It’s easy to over compensate and create a situation where the environment becomes too dry and you’ll see a wild swing from not enough nutrients to nute burn.
This is where a VPD monitor comes in handy. You may notice that you’ll need more humidity for the plants to be happy otherwise you’ll need to cut back feeding in order to compensate. The easiest thing to do is to get the right humidity for the plant to be comfortable and not make other unnecessary adjustments to compensate.
It really comes down to providing them an ideal environment and since your source of light changed the environment changed drastically as well. With LEDs you want higher ambient room temp which raises the leaf surface temp and higher humidity which will keep transpiration in check. Once these are fixed you’ll notice that your plants will grow as expected again.
I run at 80-85 degrees ambient with about 60% humidity. This puts my VPD in the 1.4-1.6 range in flowering. In veg I like a lower VPD which requires either lowering the ambient temp or raising the relative humidity. In veg I shoot for 1.1-1.4 kpd.
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please stop flushing these plants. your troubles are starting at the top like @JWM2 said.
TBH i'm shocked the OP hasn't been flamed for buying a Mars light... wait someone will come along and blame the freaking light
This...Your rate of transpiration changed with the new light.
Well it was, he just didn't account for the dryer heat from the Mars unit.will come along and blame
We're all in the same boat nobody can go anywhere and nothing's open when we get there, but two days delivery time is great, your plants should be fine, good luck!okay i ordered DTS meter,it is the same as ppm meter right? it will be delivered on monday,hope plants wont die in 2 days...i could get it by myself, but in my country, before 27 april, we dont have permission to use cars,so i just have to wait.
We're all in the same boat nobody can go anywhere and nothing's open when we get there, but two days delivery time is great, your plants should be fine, good luck!
this is the one @FourthCity shared. works for me
Google Sheets: Sign-in
Access Google Sheets with a personal Google account or Google Workspace account (for business use).docs.google.com
If you use excel, calculating your VPD is pretty straight forward. Once you’ve got the formula set up, just input temp and RH and you’ve got your exact VPD.
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calculating it beats the heck out of using a chart like this....
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I was pointed to VPD on this forum as well, and it’s changed how I track my environment for sure.
I’m lookin for that vpd cheat sheet that floating around here but can’t find it ? Do you happen to have one ?This is easy. Your rate of transpiration changed with the new light. LEDs put off less ambient and infrared heat thus lowering your leaf and ambient temps. This causes the plant to transpire less and therefore the nutrients remain locked in the growing medium inaccessible to the plants roots.
This is a common issue when switching over and takes some adjustment to get right. It’s easy to over compensate and create a situation where the environment becomes too dry and you’ll see a wild swing from not enough nutrients to nute burn.
This is where a VPD monitor comes in handy. You may notice that you’ll need more humidity for the plants to be happy otherwise you’ll need to cut back feeding in order to compensate. The easiest thing to do is to get the right humidity for the plant to be comfortable and not make other unnecessary adjustments to compensate.
It really comes down to providing them an ideal environment and since your source of light changed the environment changed drastically as well. With LEDs you want higher ambient room temp which raises the leaf surface temp and higher humidity which will keep transpiration in check. Once these are fixed you’ll notice that your plants will grow as expected again.
I run at 80-85 degrees ambient with about 60% humidity. This puts my VPD in the 1.4-1.6 range in flowering. In veg I like a lower VPD which requires either lowering the ambient temp or raising the relative humidity. In veg I shoot for 1.1-1.4 kpd.
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thanks!I’ve got calcs in my grow log that work well for me. See columns F,G,H and I.
Growing Logs
Grow 1 - Environment This is where I do all of my tweaking to get VPD tuned in. Lots of work as I don't have an automated system to monitor/adjust. Week,Day,Date,Time,SVP,VPD 0.8-1.0 - Seedling 1.0 - 1.2 - Veg 1.2-1.6 - Flower,Temp (C),Humidity (%),Notes 0,3/2/2020,1900,n/a,n/a 0,3/5/2020,1900,n...docs.google.com
judging by your logs, you sir have never truly huffed gasoline when it was still leaded. good stuff man i wish i could be so organizizedI’ve got calcs in my grow log that work well for me. See columns F,G,H and I.
Growing Logs
Grow 1 - Environment This is where I do all of my tweaking to get VPD tuned in. Lots of work as I don't have an automated system to monitor/adjust. Week,Day,Date,Time,SVP,VPD 0.8-1.0 - Seedling 1.0 - 1.2 - Veg 1.2-1.6 - Flower,Temp (C),Humidity (%),Notes 0,3/2/2020,1900,n/a,n/a 0,3/5/2020,1900,n...docs.google.com
now i have humidity - 60% and temp 23-24celsius,i will wait how they react,i wont flush other 2 plants,so lets see what happens... any idea how long i have to wait to see any results?
judging by your logs, you sir have never truly huffed gasoline when it was still leaded. good stuff man i wish i could be so organizized
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