I found this great site that has pictures of tomatoes suffering from the stress of a lack of one nutrient.
I added a high N fertilizer today, with a bit of P and K.
http://4e.plantphys.net/article.php?ch=3&id=289
I took 35 photos of vegetable gardens on the home tour today and deciding which ones to post is overwhelming me. Let me open another bottle of Cabernet and get back to you later...