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Determination of Significance：
Silicon is a very important plant nutrient element. The content of available silicon in soil affects the photosynthesis, respiration and stress resistance of plants.
Measurement Principle：
Silicate and ammonium molybdate can form silicomolybdic acid under weak acid conditions, which can be reduced to silicomolybdic blue by reducing agent. There is a characteristic absorption peak at 700 nm. The available silicon content in soil can be calculated by detecting the wavelength change at 700 nm.
Self Provided：
Spectrophotometer/Microplate Reader, Oven, Vortex Oscillator, Balance, Desktop Centrifuge, Water Bath, 1 mL Glass Cuvette, Transferpettor, Mortar, 30-50 Mesh Sieve and Distilled Water.
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