The Gee Spot - You Finally Found It
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Gee64
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It looks like you may have had a slight mag lockout but the new growth looks good. You will have to wait until those new greener ones fully open but so far so good.Tilth is great. She just got a dose of calmag a few days ago with a veg tea. I’m top watering all of my SIPs about every 3rd or 4th watering with 4ml per gallon in an attempt to stay ahead of it.
The leaves look like this. Is that mottled?
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Gee64
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Well Thanks G! You were a quick study. You applied it well
They look delicious!
. The only thing better than fresh potatoes from the garden is fresh weed from the garden!
I calibrated mine the way Stonecrusher explained below.
This is how I did mine. I took the measurements as per the table in the instruction manual for the Vipar Spectra XS 1500 Pros.
and high ev1 and happy Sunday 
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Gee64
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Gee64
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Miss Sticky - Day 14 of Flower.
Stretch seems to be slowing. I had one cola back up to 1100PPFD but the rest were all at 1000. I'm going to leave them there until tomorrow and then I will pull them all down to 950 again. I'm liking this light. The height difference between the tall colas and the shorter center colas in Larf Valley is about 12" but the PPFD difference is less than 50.
Larf Valley.
The 8 mainlined mains are pretty sweet in structure. The shade of green that these SA sativas are is incredible. It's almost neon green and gets so bright in the tops that it leans towards yellow. The yield potential on this pheno could be quite large.
The budlets almost look like buds
Stretch seems to be slowing. I had one cola back up to 1100PPFD but the rest were all at 1000. I'm going to leave them there until tomorrow and then I will pull them all down to 950 again. I'm liking this light. The height difference between the tall colas and the shorter center colas in Larf Valley is about 12" but the PPFD difference is less than 50.
Larf Valley.
The 8 mainlined mains are pretty sweet in structure. The shade of green that these SA sativas are is incredible. It's almost neon green and gets so bright in the tops that it leans towards yellow. The yield potential on this pheno could be quite large.
The budlets almost look like buds
How to Water a Potted PlantHer name keeps popping up, I will have to read her post, thank you mate
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Gee64
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@Carmen Ray have you received your MotM grow light yet? Will you hang it in dining room? It would be cool to see you grow an extra plant.
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Gee64
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Play around with it Kal. Run some scenarios in the app. Then decide what variables are hard to change, such as ambient room temp, and adjust the other 2 parameters in the calculator.Cool
I will download one
Thanks Gee
If you look at this that I posted for Azi you can see at the bottom what your targets are for the stage of the grow you are in.
Leaf temp is the tricky one. If you raise room temp it will also raise leaf temp but if both go up 1 degree not much difference is noticed. Like this
raising both did raise VPD but if room temp stayed at 90 and you only raised leaf temp by 1 degree you would get this
which is a much greater rise in VPD.
To raise leaf temps to close the gap on air temps, you add more light and the radiation in the light excites molecules in the leaf just as exercise does in our muscles, and heat is formed.
You need to be careful you don't light burn the leaves so don't get carried away, but once you calibrate your PPFD app you can guard against that.
A healthy plant under optimal conditions will try to get to 2 degrees under room temp after 10 hours of lights on. That is where optimal transpiration occurs.
It's important that you take your readings late in the plants day as they are all over the place in the mornings. You want readings from when the plant is working it's hardest or you may end up over revving your plants late in the day. Never react to earlier readings. Always from the 10 hour mark.
Then there is RH. Once your light is set properly to your room temp you can speed up or slow down the plant by lowering or raising RH.
It's not as complicated as it sounds if you run some scenarios in the app before you start actually adjusting things in the grow room.
Right now in my grow when the plants stretch and PPFD hits 1100 the leaf temp differential is 2 degrees, and when I drop it back to 950-1000 PPFD it goes to a 3.5 degree differential which tells me she may be able to handle 1100 PPFD, but I will wait until stretch finishes and she stops growing taller before I sneak in on that one, as I don't want to burn my leaves or yield and quality will suffer.
VPD is an extremely powerful tool. It's actually the difference between outdoors and indoors. Outdoors you get what nature dictates.
It surprises me that it isn't followed and used by everyone. We all have lights and nutes, so environment is all thats left.
And as always, the proof is in the pudding so lets look at the pudding. We have all read/heard numerous times that in flower 76F is the ideal temp, and most would say that after stretch 48RH is perfect. Well if you toss 76 and 48 into the calculator with a 2 degree spread you get this...
and 1.4 is perfect VPD for flower after stretch. The plants are working hard but not too hard and you still have buffer room if conditions fluctuate.
So here is the warning. If you raise VPD too high the atmosphere will suck too hard on the plant and draw water in too fast at the roots. The water coming in will not contain adequate food as it's getting sucked in too fast, and a deficiency will occur, so try to stay under 1.5 always, and 1.4 in late flower is plenty.
Don't get greedy here. Over 1.4 and you are one RH drop or temp spike away from screwing up your grow for a few days until it recovers, and possibly damaging leaves that won't recover. That comes out in yield.
In a nutshell, it's the throttle for the grow.
I don't think I will get it Gee. The sponsors specify the countries that they supply. Vipar Spectra don't supply South Africa. In fact I haven't heard anything from sponsors so I don't know what prizes are coming my way. Besides which, our postal system is completely broken.@Carmen Ray have you received your MotM grow light yet? Will you hang it in dining room? It would be cool to see you grow an extra plant
I have another light, a 200 watt LED but I can't take on any more running expenses for now.
I am growing four plants atm. I have a young Gelato auto seedling by Herbies in addition to the the sponsored grow.
It was GJOTM not MOTM
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Gee64
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If you google VPD you will get ons of info on it. You want the info on VPD that deals in RH, air temp, and leaf temp. VPD that only deals in RH and air temp is for weather forcasting, not growing plants.
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Gee64
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Right, GJotM, sorry thats what I meant. Well dang, that's sucky. Will they allow you to ship it elsewhere and a member could buy it from you?I don't think I will get it Gee. The sponsors specify the countries that they supply. Vipar Spectra don't supply South Africa. In fact I haven't heard anything from sponsors so I don't know what prizes are coming my way. Besides which, our postal system is completely broken.
I have another light, a 200 watt LED but I can't take on any more running expenses for now.
I am growing four plants atm. I have a young Gelato auto seedling by Herbies in addition to the the sponsored grow.
It was GJOTM not MOTM
i like using this chart for VPD
VPD Charts in Fahrenheit and Celsius With Leaf Temperature
We made some easy-to-use VPD charts for both Celsius and Fahrenheit, for clone, veg, and flower stages. Hope you find them useful. For more information about VPD, and to make your own custom charts, check out our VPD Guide. VPD Charts for Fahrenheit VPD Chart for Clones in Fahrenheit -2F...
pulsegrow.com
How do you measure leaf temp?
