That looks more like not enough nutes... lol.. Nitrogen deficienies usually turn the whole leaf yellow like that... Nute burn just gets the tips of the newer leaves... Look for a plant problem troubleshooting guide online to help you identify plant problems like this.. it will save you LOTS of running around... My guess is you need a little bit more of whatever part of your nutes has the most nitrogen in it... Read the lables.. which ever one has the highest Nitrogen (N).. add an extra ML per gallon or so and try that for a few days... Hopefully it will perk up! The yellow leaves are scarred like that now.. they will never turn green again after nitrogen def.. but they will be at the bottom of the plant anyways.. so you will probably end up pruning them off come flower time anyways.. good luck!