How to feed high ec without burning

Full strength Advanced Nutrients burned my plants a couple weeks into flower (in soil). Veg was OK but in retrospect too much N but only super dark green, not burned. First time in soil I rec starting at 50% on your NPKs and ramping up as they can take it.

athena's dry 'pro' line probably doesn't go that high.. anything specific for hydro/soilless that instructs anything 2-3ec is batshit crazy. companies with less integrity instruct high doses so that you buy their refills sooner.

they aren't... well they may be adding 3ec water, but that doesn't mean it all can fit in through the roots. e.g. in soil-nutes, nitrogen needs to be further broken down by microbes before it can even enter the plant, but those larger molecules will still be contributing to Electrical Conductivity, even though it cannot enter the plant. so, the plant is taking in a lower concentration than what you added to the soil in that context. the other reason -- frequency of application. if you look at a soilles/hydro context you feed all the time at same concentration - it matches metabolism of plant once you have it dialed in relative to your environemnt (no def or tox symptoms over time, even many months) sometimes it's good to get a little burn then back off, that way you know you are near the upper end of what it can handle. anyway, in soil you often fertilize less often. so if you fertilize 1 a week, it will have to be a higher concentration than if you feed every single irrigation. some differences exist between soilless and soil context. you fertigate everytime but purpesfully get a 10% runoff to ensure you maintain the EC you feed between irrigations. any build up in plant is a result of the formula being too strong in this context. in soil, you water until the entire thing is wet and you may get runooff, but runoff is wasted nutes with no benefit (assumes everything is going well) in this context. when you give water only inbetween, it's just to keep minerals flowing vs any callibration or maintaining an equillibrium as you do in soilless. the key takeaway here.. although feeding on demand is more optimal and will result in faster growth, you will for the most part give the same mass of N/P/K et al over time, relative to growth rate, as you would in the other growing methods... obviosuly, the methods that result in faster growth will use a bit more over time.. rates of change... rate of provision less rate of use... this is calculus, not addition and substration. feeding is simple, but also complicated :P

It's the amount of water available. In a coco or dwc which is always wet you can get away with high ec and plants won't burn nowhere near as easy. If they were to get dry they start burning. Same as if you fertilize your yard. If you get steady rain the yard grows great, but if it gets dry the yard will burn up.

Should also add, some nutrients are really weak, I found canna to be this way. So plants would need more of their super expensive salty water.

Soil can take more than water or soiless grows, but 3 ec indoors is still to high. Soil indoors can have 2.4 ec as long as it isn't building up in the soil. Outdoors Imy max feed for the big girls is 3 ec