If there is can you please give me the link? Thank you.
The kind and amount of nutrients is probably a job that only a mass spectrometer could fully do.
Lefty
Do you need to know which specific nutrients are in the soil? Or are you looking to find the EC/TDS/PPM value? If so you can use the EC-shield from Practical Maker.
I also need to need to know what nutrients are in the soil.
To know which substances are in the solution you need some very expensive sensors... I gave up looking for a cheap alternative on that one. There aren't any...
Measuring a specific substance in a solution is difficult, but measuring them in a solid I've found out to be much much harder. The easiest thing to do is take a sample of the ground, mix it with distilled water and measure the substances, but very difficult and expensive...
Oh I see. Anyway thanks to all of you