Of interest to growers starting tomatoes from seed

In colder climates (like NH-USA) wondering why tomato plants are turnng purple is a common plaint. Here is an older web page that talks about some of the chemical actions of phosphate. I think it is a good read for any new tomato grower.

http://www.selectedplants.com/OrthoPhosphate.htm

As an aside, gosh I liked the old text based internet.

 

https://chemistry.stackexchange.com/questions/119341/what-is-super-in-superphosphate

 

Super is way more complicated, especially after reading the link. Now I am really confused. I think I’ll just stick to my compost.