Yellow patches appeared on fan leaves on 2 of 3 plants - overnight. Concerned because it was so sudden. A couple of leaf pairs on each - differing heights
Plants: 3 x Lemon Haze photo clones
Status: 2 weeks in veg
Height: 10" tall each.
Growth Rate: 1" per day
Medium: Canna-soil Pro in 5 gallon pots
Nutes: Canna-vega 1:200 (every third water)
Water: pH 6.5 (thirsty girls, drink about 1.25 litre each a day with minimal run off
Tent: 4x4x7
Lights: 18/6 600W HPS (I know MH is preferred - I was informed that timing was more critical). I can swap back to fluro if needed. Lights were at 20" from canopy - increased to 26"
Do you know your runoff tds/ppm? Daytime temps are really high as well which will be causing a big uptake in nutrient rich water, that can in turn lead to burn as the plant struggles to process the extra nutrients it’s getting. Have a look at inkbird type controllers. I have mine set to bring exhaust fans on if it gets too hot in there. Be careful if you do buy a controller as some control humidity and some control heating/cooling
Thanks for the input! No, I don’t have a awy of measuring runoff - I am in soil - I thought that was a aquaponics measure?
I was wondering about the nutes. Is it best do give them some pH balanced water? Or let them adjust?
I’m not running a controller at the moment - just learning where my balance is (only second day under real lights).
Under fluro in the same tent I was holding 23C & 60+RH - it is the heatload from the light (non vented) that has bumped me +10 C & -20% humidity. Tempted to go back to the fluro lights - they were happy…
was trying to do the right thing by giving them lights. Possibly too early in their life?
I’m also in soil and monitor my PPM and PH constantly. Water till you get a slight runoff in the saucer and check that. I use Apera and Bluelab. Big lights gave me heat stress as well. I checked my HPS and they were up around 600°C if I remember. I always give my babies plenty light as well and just watch for burn
Ok cool.That is something else I’ve learned. Will have to get my hands on the meters. For now - it sounds like fresh water and run off to dilute the existing. I’ve lifted the light higher than suggested to try and improve things. Is the something that is easily recovered from? Thinking I might put the HPS away until they grow up a bit…
Just about to upload some pics
Hps is an awesome light. Metal halide for veg though and cfl for seedlings. MH has more blue, hps is more red for flower and seedlings seem to respond better to cfl.
There’s a scrog net in there somewhere . My colas are stretching for the sky and nature has taken over. In my defense they are all at different stages. There’s clones, sativas, indicas and autos in there. Some have just started flowering, some are mid way and some are closer to harvest. I even have two that are just showing preflowers
If you don’t have a ppm/ph meter how do you know your ph. I had those color leaves on seedlings on the bottom but I believe it was because I tried some distilled water and didn’t ph it. I use bluelab meters
Thanks. I might be fortunate that my tap water, when filtered gives a tested pH of 6.4 - 6.5 consistently. I leave it sit for 24hrs so that the chlorine smell dissipates. I haven’t had to tweak it since I started checking it about a month ago.
That is a gadget I’ve had my eye on though.