nute burn from soil drying out ?

Hey whats up.I got a problem with my ice cream.

everything was fine up until the first week of flower,really healthy looking and bushy,i was watering every 4 days ,waiting until the soil had dried out at the top and the pot was light,but plant not drooping.well on the day the plant was due a watering i woke up to find the lower and some middle fan leaves extremely brown and crispy round the edges and the tips.I haven't been feeding them as there is nutes in the compost ,but i know that the compost is on the hot side,run off 3 ms. I think i heard that as the soil gets dryer the salt concentration get greater,therefore plants can get burnt as the soil drys out,do you think this is what happened? Note also there was brown spots on some of the new leaves on some of the branches that sprout up during the stretch

Add Nitrogen immediatly. Half strength, the dead will not come back but within 4 - 7 days you should see noticable new growth and the good leaves should get bigger and a deeper green.