What type of nute burn is this?

What kind of burn is this? too much of? how do you address nute burn?

if it were me id not drop nutes on the poor thing


its a classic you have either dripped some water with food in it onto the plants leaves and the lights evaporated this water concentrating the ferts in the water to the point of burn or simply sloshed some food on it when mixing up , id be very very surprised if it wasnt this , to give yoursalf an idea of what the poor thing went through dip your finger into the plants food then the the tip of your tongue , its an eye opener on what we all feed them thats for sure