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AJY
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ok. finally obtained distilled water.do a 1:1 ratio of soil and distilled water unless your water is dead center 7.0
also, if your water gets to 6.8 ph than why are you using ph down at all?? your soil reduces the ph automatically so it is available to the plant.
Lets get those readings and see where it is at
interesting. I had no idea the temps 'should' be higher for LEDs. I was apprehensive getting up to that temp. Now to get my PH down. My soil is very old in this case and is somewhat akin to proMix at this point. Thank you.with LEDs you want those temps up ~80F. You're seeing VPD issues on top of it due to what the others said, potential lockout from pH being out of whack. Easy to recover from both.
yeah it's a definite discomfort thing with LEDs initially. It's counter to what we learned with HIDs. The primary reason is LEDs don't heat up the leaf surface as much due to typically not having as much infrared light, so to ensure that the leaf surface is warm enough for stomata to open we have to drive up the environment temps.interesting. I had no idea the temps 'should' be higher for LEDs. I was apprehensive getting up to that temp. Now to get my PH down. My soil is very old in this case and is somewhat akin to proMix at this point. Thank you.
crap. ok. that is some GOOD stuff. I had NO idea about this. I use Plant therapy to help keep pest & mildew issues at bay. thx again. I start feeding a lower PH && get my temps up[ to 80 for sure.yeah it's a definite discomfort thing with LEDs initially. It's counter to what we learned with HIDs. The primary reason is LEDs don't heat up the leaf surface as much due to typically not having as much infrared light, so to ensure that the leaf surface is warm enough for stomata to open we have to drive up the environment temps.
Ideal temps/RH under LED are variable, but I typically shoot these numbers in veg:
Air temp: 82F
Leaf Surface Temp: 79F
RH: ~60%
This should give a VPD of ~ 1.14 kPa, which ensures the plants are able to transpire at optimum levels.
really, the primary temp you want to look at is your leaf surface temp. if you don't have one, pick up one of those cheap infrared temp guns and measure the temp across different leaves at the canopy level and average that #. Adjust the air temp to whatever is needed since leaf surface temp is the one that matters most (you want it close as possible to 79F as that's the maximum transpiration golden zone), and RH is the second most important number.crap. ok. that is some GOOD stuff. I had NO idea about this. I use Plant therapy to help keep pest & mildew issues at bay. thx again. I start feeding a lower PH && get my temps up[ to 80 for sure.
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