Tomato leaves starting to turn purple

[SharonRossy]

So today I went to check how my plants did after a deluge last night and I noticed my Japanese Black Trifele had leaves that we're turning kind pd purple on the edges and some spotting on the leaves.
I know I read something about this but does it affect production?

Sharon

[PunkRotten]

I believe it is a nutrient deficiency. Check this out http://customers.hbci.com/~wenonah/min-def/tomatoes.htm