Back on the recipe page, click on your new recipe, in this case spring mix 1, and then the configure salts icon to begin entering the salts you will use. Don't worry, this only needs to be done once. The next time will be a breeze.

It doesn't matter if you are using a base salt like calcium nitrate or a blended balanced fertilizer, all of them will have an percent analysis by element. These are entered using the selector at the bottom of the page. Ensure you enter all elemental percentages carefully to ensure precision of the final recipe. You'll have to hit save for an element to be added to the fertilizer.In this example, we will be using magnesium nitrate, MPK and ABC Blended Fert.