#$%^&*AU2020100291A420200409.pdf#####James & Wells ref: 313600AU/0 ABSTRACT The present invention discloses a precision fertilization system. The fertilization system includes a sample injection device, a nutrient detection device, a control device, and a fertilization device, where the sample injection device, the nutrient detection device, and the fertilization device are all connected to the control device； the sample injection device is configured to absorb an injected sample solution and conduct reaction； the injected sample solution includes a nitrogen reagent, a phosphorus reagent, a potassium reagent, a nutrient solution, and a diluent； the nutrient detection device is connected to the sample injection device and is configured to conduct colorimetric analysis on the reaction solution to obtain absorbance； the control device is configured to control inflow of the injected sample solution in the sample injection device and wavelength adjustment of a light source in the nutrient detection device, and is further configured to calculate concentrations of fertilizers in the injected sample solution according to the absorbance and send a fertilization signal to the fertilization device according to the fertilizer concentrations； and the fertilization device conducts fertilization according to the fertilization signal. The present invention can implement in-situ, automatic, and rapid monitoring of nutrients, and conduct precision fertilization according to monitoring data of the nutrients. 10FIG. 1 Detection device Sample injection device Light Liquid potassium source reagent Multichannel Liquid nitrogen plunger pumpregn Monochromator>； ----- Liquid phosphorus g reagent sample Sample chamber outlet Sample cell inlet Diluent Sampling Detector Nutrient solution waste liquid tube Oscillator t I t Control device Fertilization device Water Water inlet outlet tube bare First electromagnetic
