Looks more like you had water on the leaves maybe when you used the nutes?
A couple of bad leaves doesn't mean a deficiency. A deficiency will show up on all leaves in the same class that it's affecting. Low N, P, K, Mg will show first on older fan leaves first. Some like low Ca and S will start on middle/top leaves and low or locked out micro-nutrients like iron, zinc, manganese tend to show on the newest growth like the tips first and that's mainly caused by the pH being too high.
I found a great spot to download
FREE POT BOOKS . I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as many are 50+ megs. They got lots. Enjoy.