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Please help i have nitrogen toxicity

  • Thread starter Thread starter kyle57843
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Please help i have nitrogen toxicity

kyle57843 50 Replies 6,547 Views
Page 3 of 3 · Replies 41–51 of 51
#45
Aqua Man said:
Reasonable.. bit high rh with lights on may benefit bit they will do fine like that.
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16072852099892974987903798469782
 
#47
Should have said bit higher RH will benefit them but 50 is ok. My target would be 60-65% but not a huge deal. They will be fine like that.
 
#48
Aqua Man said:
Should have said bit higher RH will benefit them but 50 is ok. My target would be 60-65% but not a huge deal. They will be fine like that.
Click to expand...

He can go even a bit higher on RH.

I converted his 74 f to c and got about 23c. Plugged it into my vpd calculator.

Screenshot 20201206 1501092


70% will get you a vpd of .8 which is perfect for veg with lights on .

I have this very old screenshot of spur who basically gifted the knowledge of vpd to the cannabis community.

Screenshot 20200103 235912


So in veg without a scrubber 65%-70% will put you in that goldie locks zone of .8-1.0kpa
 
#49
BroScience101 said:
He can go even a bit higher on RH.

I converted his 74 f to c and got about 23c. Plugged it into my vpd calculator.

View attachment 1064570

70% will get you a vpd of .8 which is perfect for veg with lights on .

I have this very old screenshot of spur who basically gifted the knowledge of vpd to the cannabis community.

View attachment 1064571

So in veg without a scrubber 65%-70% will put you in that goldie locks zone of .8-1.0kpa
Click to expand...
Have to take leaf temps into account when using VPD trust me there is a pretty significant difference and generally speaking you calculate much higher RH than should be without using leaf temps.

I did a write up here that gives a formula for a calculator at the end but there are apps for this now.

www.thcfarmer.com

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...
www.thcfarmer.com www.thcfarmer.com
 
#50
linde said:
if you want healthy plants NO dont let them dry out. Cannabis is not a succulent. roots won't form in dry soil.
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Airpruning! Killing the roots is good! I heard this on every grow forum the last 10 years.

And now you must use a rebranded Chapin 1949 sprayer with a pot leaf to water your plants. I love this religion!
 
#51
RippedTorn said:
Airpruning! Killing the roots is good! I heard this on every grow forum the last 10 years.

And now you must use a rebranded Chapin 1949 sprayer with a pot leaf to water your plants. I love this religion!
Click to expand...
... what do you do here..?
Just pop in to hang out and ridicule the host community?
 
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