Mixing fertilizers by your own will reduce cost of agricultural. you can make a desired formula that best for your plants and soil and cost reduced, for example your plants require 6-18-18 but in the market have 8-24-24 so, you can do a calculation how much of 8-24-24 required or by mixing of 3 main fertilizers directly to get 6-18-18 or find how much of 8-24-24 + filler to get 8-16-16.

If you already have some fertilizers and wanted to mix them to get a new fertilizer formula, this app will help this calculation.