耕作問題 --- 土壤養份測試

In soil testing kit, the detection methods are based on colormetric.

Nitrogen - based on Cadmium reduction method
Phosphorous - based on Ascorbic Acid method
Potasssium - based on Turbidimetric Tetraphenylborate method

When we are using the analyzer, we will detect the concentration based on the abosrbance at a particular wavelength instead of using color comparator.