The script ( download here ) allows you to create your own fertilizer mix for hydroponics or soil from over 50 different fertilizer salts and over 200 NPK fertilizers can also be used.

Procedure

1) Select the example nutrient solution or specification and display it

Tried and tested nutrient solutions from the literature, see  in the drop down menu Predefined nutrient solutions 

Don't let the years fool you: practically nothing has changed since 1966, only the temperament of the discussions about it. What you should keep in mind is that for several years there have been breeds that require an extremely high dosage (EC value >= 4.0) to thrive. Select a nutrient solution here and click    

In the graphic shown below, the required elements are displayed as bars. Each red bar represents 100% of an element. This graphic facilitates the following mixture of added fertilizer salts.

2) Add fertilizer salts and/or ready-made fertilizer

Select from the Drop-Down  

the first additive.

Indicate the quantity in grams per litre (g/L) or milligrams per litre (ppm). Then click on

In the graphic (above) the quantities are now displayed in relation to the specifications (if you have selected one). This way you can see how exactly the quantity information corresponds to the specifications in percent.

The table also shows what amounts this corresponds to in grams, milligrams (ppm), moles and milli-moles. A column shows you the text Target And Actual value the fertilizer mixture - but only if you have chosen a specification. In the graphic at the bottom of the screen you can see the display as a long shot. Here you can better see the relationships between the individual elements. 

3) Add more substances (fertilizer salts)

To add more substances click on  

After each selection of another substance and quantity, click on   

4) NPK fertilizer add to

The program can also take standard fertilizers into account. These usually only contain the macro-nutrients N (nitrogen) P (phosphorus) and K (potassium). With the button  

<ou can  add another variety of NPK fertilizer that has a different mixing ratio. This means you can combine fertilizer with 10-20-30 and 8-16-24 and see immediately whether the amount of the individual elements is too large or too small. To see the result, after entering the quantity and magnitude (gram or PPM), click on  

5) Search for items in the fertilizer salts/finished fertilizer list

In the input field Search for element in fertilizer additives/prefabricated fertilizers  

(e.g. Fe)

   you can search for an element independently of the rest of the program. All fertilizer salts and finished fertilizers are searched for this element and displayed in a list sorted by content. Please only enter one element and click on 

 The element names are also under the graphic bars at the top and bottom of the page. In the table, the element name is in the left column, its common name is in the column on the right. 

Intention:

This fertilizer calculator was originally only intended to add up various NPK fertilizers and calculate their total NPK at the elementary level. Since this makes little sense without comparative values, a few standard hydroponic fertilizer recipes were added to give the value a certain significance. Further refinements (Ec value, pH value) were added over time, as it is helpful to have prior knowledge of the expected conductivity (EC) and the pH value. The scope requires a different programming language, but since our customers use a wide variety of operating systems, only HTML and JavaScript remained as common denominators. Unfortunately, I'm not a fan of these "languages".

This means you can always have this "calculator" with you, even without internet. A browser (built from 2000? for very old browsers, an untested alternative is commented out) and this HTML page will suffice.

All data is stored on this page and allows you to easily expand the scope as you wish according to your own needs. If you also want the graphical representation without internet access, download the file Chart.js to your local machine and adjust the path in the script: https://borgmann-aquaponik-hydroponik.ch/chart.js... It is version 2.9.4. You can find them on the Internet here: https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js - at least that's how it was this morning. Good luck!

PS: If there are errors or useful extensions (including fertilizer), you are worth a message write to me.

The fine print

²) When fertilizer mixtures (NPK + X) are used, it is not possible to calculate the EC and pH because the composition is unknown. The values used are then estimated - and can therefore be viewed as "fantasy". When it comes to empirical values, they are marked with (real).

⁴) The pH and EC values should be viewed with scepticism. Not always are the information provided by the manufacturers correct! - Always check with pH and EC meter -!

 ⚠️ Please note that some of the chemicals used can be toxic, harmful or explosive. The author assumes no responsibility for errors in the program.

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