Mixing fertilizers
 

Hey guys.

This is my first post.

Yesterday I wrote a program that figures out the best way to combine seperate fertilizers to get a nutrient profile that better matches one you want.

So, for example, if I wanted a fertilizer that was, say, 13-1-13 but I didn't have one, but I did have 3 other fertilizers, it would tell me how many grams of each I need to add to a litre of water to get my desired 13-1-13. Also works with just 2 other fertilizers.

Anyway, I have an ideal nutrient profile I've put together from information I found online all day yesterday. And I want you guys to take a look and tell me if you think anything stands out as wrong.

This will be a fertilizer for tomatoes:

Nitrogen: 125 ppm
Phosphorus: 9 ppm
Potassium: 125 ppm
Calcium: 140ppm
Magnesium: 48 ppm
Boron: 1.5 ppm
Mo: 0.12 ppm
Sulphur: ?

(As an NPK rating: 12.5-0.9-12.5)

Also, if the above profile is correct, then I can tell you that if you have Miracle Gro and Phostrogen, you can get a better profile with 0.3g of Miracle Gro and 0.38g of Phostrogen than with either alone. (Obviously you'd make more than one litre. I don't expect any of you to mix micrograms of ferts.)


So, I'm probably completely wrong and I need someone here to point it out.

Thanks.