Megacrop website says something about comparing to Jack's but not the 10-20-10 you mention and they say MC is meant to be used with weekly teas or veganics style. Nothing about using 10-20-10. If it's phosphorous you're trying to fix try proper pH down that will be metabolized somewhere close to...
Those pistils mean female, don't think it means it will hermie. My guess is the seedling got dry stress it's genetics(and endophytes) are going to flower super fast.
There's an electronics store I can go to but last time I asked him about a 20$ hack the guy wasn't helpful. I want to find a cheap thermostat that can relay a low voltage to either 12 volt or battery speaker alarm but looks like it's the same price and easier to go with an Inkbird.
I'm monitoring the temperature on an exhaust duct, just looking for a beeping sound if temperature is high.
Any way to make a simple device that just sounds an alarm at a set temperature? Hack a cheap thermostat?
I'm using an ITC Temperature Controller but want to put it to better use and can't...
The water content in your medium is probably the problem, need irrigation events with runoff management (*think hydroponic solution flowing) . More ammendments won't really help.
Note that there is a calcium ammendment like Oyster shell powder/Gypsum that will get leached and stuff from ProMix. So too much runoff can be bad too and midway through my grow I sprinkle a few grams of some form of mineral with mainly calcium content on my medium doesn't seem to harm my plants.
Want to point out that early veg is really without runoff where the higher humidity makes for little to no dryback so your EC is building up in ProMix. As you start more pronounced drybacks and roots fill out is where you look to get better irrigation with runoff.
Pro-mix holds nutrient solution (water) differently than coco. I've seen my runoff go beyond 3600 PPM while feeding 600PPM with little to no runoff. Avoid letting your ProMix medium dry to less than 30% water content and every watering day should have at least 10% runoff to keep EC ramping up...