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I agree. Some of the leaves that were OK a few days ago aren't looking too good now. Is 1 tps/gallon the recommended dose for Flora Trio? What's your EC/PPM? At that stage of growth, my plants are generally at about 1.2 and then up to 1.6 or so in mid-flower. And you're using the air pump +...

"My guess is that an experienced, intuitive grower and an experienced, mathematically-minded grower will ultimately get to the same result within a few grams." No doubt, for the simple reason that they're just different labels for the exact same thing. A VPD of 1.0 is one number to describe...

Yet another picture! If you keep plants in the sufficiency zone, they will reach their genetic potential. More nutes may get you into the toxicity range but the good thing about hydro is that you can "flush the medium" just by changing the water. Re. nutrient levels - in flower, my grows will...

And whether or not VPD had been formulated (I think it was in th 1930's), growers were still keeping their temps and RH within certain ranges and, therefore, they were keeping their VPD in range. VPD is just one number that covers a range of temperature and RH combinations. So if you're keeping...

Which reduces their ability to grow because they're not getting light for that time period but that's a separate issue. Interesting that they're growing taller sooner but what about yield? Understood but those are components of VPD. Question I should have asked from the start - seeds or...

They look great in the photos. Why do you think they're not getting enough nutrients?

It's photons and photons are all the same. Sunlight has a different spectrum than an LED and, since it's through a window, it's not going to be a lot of light. One issue to watch out for is heat from the sunlight because sunlight has IR in its spectrum and if it's behind glass and not getting...

Those plants look like they have a lot of N in them and the burned leaf tips and leaf discoloration indicate a nutrient imbalance which is typically caused by a VPD that's high. One of the leaves is completely desiccated.

You've got the data points nailed down for VPD and it's interesting that you're getting higher growth rates at 1.4 than at 1.0. At 1.4, your plants are transpiring more so water uptake and nutrient consumption will increase. Are you seeing a change in those parameters or are you changing EC...

VPD is just a way of using one number to refer to different combinations of temperature and RH. Overall, cannabis grows optimally, in veg at about 1.0, for example. The VPD chart tells you what combinations of temp and humidity will provide optimal growth for plants. If you're coming up with...

The last thing I want to do is remove healthy plant tissue and force the plant to regrow it. That's a net loss to the plant. Does it regrow? Sure - the plant needs those leaves to survive but I've never seen any data that it increases yield or improves crop quality (the ratio of flower to above...

There is a small amount of blue in the spectrum and I suspect that it's enough to avoid issues that might crop up if there's not enough blue. Mars is in the business of making grow lights so I'm assuming that their lights won't cause that kind of problem. Re. PPFD maps - I haven't seen...

I appreciate the info and it sounds like you're a very happy camper with the new lights. I went back to the Mars page and, perhaps it was on the page and I didn't notice it before, but scrolling down the page, they have a good guide for helping customers figure out which light they should use...

I would not get the new SP 3000. It's a very different design than the one that the OP has (I have one from 2021) and the PPFD map on the new light is "unusual". Here's the PPFD map from the 202 model (link to light test is here) Here's the PPFD map from the new model (original here) The...

Your light levels were really high and that's a good sign that your grow environment was in good shape. Kudos for that. I was surprised to read that you removed so much foliage from the plant. I firmly believe that's something that a growers do thinking that it improves growth or yield or...

"Yea but led lights demand lots of magnesium soo turning it down could be a smart move." "lots of magnesium" compared to what? Over the years, I've seen that growers who switch from gas discharge to LED "need to increase Mg" but I can't figure out why. Any chance you can explain why or point to...

I call that a "Maytag repairman" grow, from the ads on US TV back in the 80's.

"I also turned my light down a touch until I see them recovering." - unless a plant is suffering from too much light, you're reducing the plants' ability to recover because it can't generate as much glucose. As the metabolic rate drops, the entire grown environment changes - reduced metabolism...

That's good RH for that temperature so the environment is good. Seems like it just needs more Mg. I think I've read that Mg deficiencies take a while to show up so perhaps it was something out of whack a couple of weeks ago.

What's your RH? Interesting article re. nutrient issues in hydro.