Low temps won't cause that. pH is a possibility. How wet is your soil? Did you let your dry ferts compost before planting? Perhaps the addition of bottled salts (age old isn't organic) slowed the decomposition process and the increase in moisture might have triggered the soil to heat up with uncomposted dry ferts. It looks like hot soil burn to me, but don't quote me on that.
I will, because I agree. They look like someone dumped a qualified metric shit-ton of salt-based fertilizers on them.
Man, am I sorry to see this. Heartbreaking.
I have gypsum. Would dolomite lime work faster? And how should I administer. Mix with water and flush, or make a weird tea haha
No, don't use anything with more carbonates in it. Dolomite lime (CaMgCO3), oyster shell flour (CaCO3), and the like are to be avoided here. The issue
@Bulldog420 is discussing is
caused by carbonates and bicarbonates. If you dump dolomite lime (CaMgCO3) then you're loading up with even more carbonates. The molecule you need to watch out for is expressed as CO3 (can't recall the expression for a bicarbonate).
Edit: I see
@Slownickel @Blaze @Bulldog420 gotcha covered. Listen to these guys. Seriously. If they correct me, listen to them, not me.