DirtyDogs446
Well-Known Member
Yesterday I turned down the rh and raised temp slightly today they are perky thank you for all the info
Possible light issue?
- Thread starter DirtyDogs446
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coreywebster
Well-Known Member
You probably don't need any nutrients but you're not supposed to be using just grow big on its own I don't think
Indeed looking better, don't give any nutes now, it seems like it's messing with your medium balance a bit.
Remember, aside from VPD, which shows you what temp is good for what rh and the opposite, all plants grow better if you give them better conditions.
People post VPD but they don't understand that optimum conditions are constant, and according to the VPD charts, I can grow them at 20c with low rh and my VPD will be considered good, but it won't make them grow better or faster.
The rules of the jungle are simple
Things grow faster and better with high heat high humidity.
Good to hear! That's a great way to get things dialed in.
Now that the issue has been diagnosed as a nutrient issue, how about giving your plants more food?
Re. "very very close" - is "good enough". The goal is to get the grower in the ballpark and then they can adjust as needed. An Apogee is calibrated to 5%±. A light meter+conversion factor (which is how Photone works) may be a more inaccurate because there's 5%±, in the case of the Uni-T, as well as, perhaps, the conversion factor being off. But that's fine because even if it's, say, 10% off, that's only 100µmol at high light levels.
I usually take light readings daily and, with the plant at it's current size of about 2' x 2' x8", I take nine samples.
These data are from yesterday. It's a Growcraft X3 at 292 watts. The plant is in day 44 and the schedule is 24/0. The canopy looks level but, looking at the numbers, it looks like the light is crooked and/or the canopy is lower in the back left and rises to front. And there's a difference of 150µmol± between those two spots.
It's like raising kids - just give them the best conditions you can and watch them grow.
Now that I think about it a bit, we do vivisect them and then burn them so perhaps the "kids" analogy isn't quite right…
Alright, my bottle says 2-3tsp/gal or 4 tsp/gal for a heavy feed. Personally I've never gone over 2.5 tsp/gal for mature vegging plants which even then caused some issues with overfeeding. Did you mean 5ml/gal by chance?
LedbetterCookiez
Member
Boron shortage. Should get better with root growth, your plants were real close to topping themselves though.
Phytoplankton
Well-Known Member
I don't see a darn thing wrong with them. Let them adjust to their new home, they'll be fine. VPD is vastly overrated IMHO, look at outdoor plants, the VPD swings wildly and they do just fine.
Phytoplankton
Well-Known Member
A Boron shortage in HF soil is highly unlikely, in fact any commercial soil should be fine. Happy frog doesn't have nearly as much NPK as FFOF, so after about 2 weeks you'll need to start a nute regime. .
VPD out of range can cause significant issues. This YT video might provide insight.
One key issue is that as transpiration increases, water uptake increases and, in turn, the amount of nutrients in the plant increases and that can lead to nutrient imbalances. The plant will keep the same % of water, over time (it has to or it would burst), the primary mechanism being by opening the stomata and allowing the water to escape. That helps cool that plant.
But what happens to the chemicals that came in with the water? If it can't use them quickly enough, that will tend to create an imbalance. Perhaps that's what happened here?
One key issue is that as transpiration increases, water uptake increases and, in turn, the amount of nutrients in the plant increases and that can lead to nutrient imbalances. The plant will keep the same % of water, over time (it has to or it would burst), the primary mechanism being by opening the stomata and allowing the water to escape. That helps cool that plant.
But what happens to the chemicals that came in with the water? If it can't use them quickly enough, that will tend to create an imbalance. Perhaps that's what happened here?
You can be outside VPD as long as you keep basic rules in veg / flower.
Like @Phytoplankton said, VPD is overrated as it confusing growers.
Look at nature and you will understand everything, the hot humid amazon jungle for veg, and the cold, low humid of malana mountains for flowering
But in reality we want yield aswell as density and other stuff that heat and rh contribute to.
So it should be more balanced at flowering especially as it's the crunch time, both for budding and trichomes (quality).
MichiganGrows44
Active Member
Vpd is for those that have their systems dialed it to near perfection. If you don't, don't worry about your vpd. It'll drive you insane. Just grow it brother, it's a weed, light, water, soil, and a little pretty fan
Hollatchaboy
Well-Known Member
Vpd can be a limiting factor. Sure you can absolutely grow good weed outside the optimal vpd range, but....... could it of been better had it been grown within range?
A plant is going to express its traits best, when all it's demands are met.
A plant is going to express its traits best, when all it's demands are met.
DirtyDogs446
Well-Known Member
When I started growing in 2018 I never even heard of vpd now it's a thing lol but I am trying to be in decent range now that I know they are looking good now just needed to adjust
Phytoplankton
Well-Known Member
And that's all you need, just be in the "Ballpark".
DirtyDogs446
Well-Known Member
Also I just realized I was using 6 teaspoons of grow big instead of the big bloom. Literally just caught it lol
Cboat38
Well-Known Member
I was hoping someone would say that, the op is doing too much for it be a seedling. You got to keep it simple that soil has enough nutrients in it to last until it’s first transplant, shit I use fox farm soil and I don’t top dress until I see my first stigmas lol…. but for real