Sick plants.....

[InkAddict$]

Well my big ones are yellow af.....now my babies look terrible....the veg tent been running at 77-81°f/ 70-75%rh......could it be my cool mist humidifier was pointed at them...I'm using happy frog...ph going in 6.4-6.8 water every couple days..... haven't fed yet...ppfd is mid 300 range....what could it be they a curling up and the tips of one look like mold or browning....

 

[Kyote]

First thing i noticed is your RH is way too high. 50% to 55%rh with temps 78 to 80f. The one in flower could probably use some additional nutes, as HF won't get them to the finish line without additional nutes.. 1/3 to 1/2 strength is where i'd start with the nutes.

Am wondering if you are overwatering on the smaller ones?

 

[InkAddict$]

First thing i noticed is your RH is way too high. 50% to 55%rh with temps 78 to 80f. The one in flower could probably use some additional nutes, as HF won't get them to the finish line without additional nutes.. 1/3 to 1/2 strength is where i'd start with the nutes.

Am wondering if you are overwatering on the smaller ones?

I got 2 separate tents one for flower the big ones are in and my veg tent little ones are in....flower tent is 50-55%rh I had veg tent 70-75%rh I fed the flowering plants yesterday....I was over watering.....I know that...

 

[InkAddict$]

First thing i noticed is your RH is way too high. 50% to 55%rh with temps 78 to 80f. The one in flower could probably use some additional nutes, as HF won't get them to the finish line without additional nutes.. 1/3 to 1/2 strength is where i'd start with the nutes.

Am wondering if you are overwatering on the smaller ones?

Also veg tent I lowered to 60-65%rh is that to high?

 

[Kyote]

VPD is your friend for figuring out temps/rh for plants at various stages of growth.. in veg, i'm between 55 and 60%rh @80f..

Here's some homework for ya if you so choose to read up on VPD

The Ultimate Vapor Pressure Deficit (VPD) Guide

"Why devote an entire guide to VPD?" you might ask. The answer is that the vapor pressure deficit (VPD) is extremely important for growing plants. VPD helps you identify the correct range of temperature and humidity to aim for in your grow space. With VPD you can achieve the best results while...

pulsegrow.com

 

[InkAddict$]

Vpd I have ac infinity blue tooth ventilation controller it's say my vpd is to high for flower ...this is the range it says on there 1.2 kpa to 1.4 kpa so 80°f 60%rh is 1.4 what I had my flower tent at....now veg is 1.0 kpa I had it at 70-75%rh which shows correct....so I'll lower it but I was using a chart and watching my environment to a tee....

 

[InkAddict$]

Thanks you I like the vpd calculator....

 

[InkAddict$]

VPD is your friend for figuring out temps/rh for plants at various stages of growth.. in veg, i'm between 55 and 60%rh @80f..

Here's some homework for ya if you so choose to read up on VPD

The Ultimate Vapor Pressure Deficit (VPD) Guide

"Why devote an entire guide to VPD?" you might ask. The answer is that the vapor pressure deficit (VPD) is extremely important for growing plants. VPD helps you identify the correct range of temperature and humidity to aim for in your grow space. With VPD you can achieve the best results while...

pulsegrow.com

Ok I had veg tent to high I changed it to 65%-70% rh. I was using it at seedling stage....cause they were and I have some in there.....thank for the info it helped....

 

[Delps8]

I'm a hydro grower so my knowledge of soil is very limited but…isn't the drooping leaves the classic sign of overwatering?
A VPD of 1.4 means that you don't have enough humidity whereas lower VPD value indicate that RH is increasing.

VPD is the difference - the "deficit" - between the vapor pressure (the amount of water) inside the leaf compared to the humidity and temperature outside the leaf.

Loosely speaking, seedlings like it hot and wet - 80° and high humidity are what they need. As a cannabis plant goes into veg and flower, you want to keep the temps up and RH down because that helps the plants "respire" which is when that take up water (and nutes) and then breathe it out. That's how plants moderate their temperature and it also drives the uptake of nutes. If your VPD is too low, plants don't take up water which means that they don't get nutes.

Good example - the climate in the Southeast US is hot and humid. We humans feel that. It's "sticky". Move 2k miles west. It's dry and hot. It doesn't feel hot but, no doubt about it, that low humidity means that everything has to take in a lot of water to cool off. Plants are impacted in the same way.

 

[InkAddict$]

I'm a hydro grower so my knowledge of soil is very limited but…isn't the drooping leaves the classic sign of overwatering?
A VPD of 1.4 means that you don't have enough humidity whereas lower VPD value indicate that RH is increasing.

VPD is the difference - the "deficit" - between the vapor pressure (the amount of water) inside the leaf compared to the humidity and temperature outside the leaf.

Loosely speaking, seedlings like it hot and wet - 80° and high humidity are what they need. As a cannabis plant goes into veg and flower, you want to keep the temps up and RH down because that helps the plants "respire" which is when that take up water (and nutes) and then breathe it out. That's how plants moderate their temperature and it also drives the uptake of nutes. If your VPD is too low, plants don't take up water which means that they don't get nutes.

Good example - the climate in the Southeast US is hot and humid. We humans feel that. It's "sticky". Move 2k miles west. It's dry and hot. It doesn't feel hot but, no doubt about it, that low humidity means that everything has to take in a lot of water to cool off. Plants are impacted in the same way.

The 1.4 is my flower tent its at 80°f 60%rh if you go by vpd chart it says I'm in range ...1.0 is my veg tent.. I thought that is correct..... I had my tent up say temp is 80°f I had the humidity 70-75% rh.....I just lowered it cause of the others getting bigger....to 65-70% ....it could be overwaterd and I had humidifier blowing straight at them...idk....I havnt feed them...I use ro water should I add cal-mag when feeding little ones?