Soil ammonium nitrogen in-situ sampling detection device and method based on microfluidics

The invention relates to a microfluidic-based soil ammonium nitrogen in-situ sampling detection device and method. The device comprises a soil solution extraction unit, a microfluidic unit, an optical detection unit and a control unit. The soil solution extraction unit is used for filtering and extracting a soil solution and injecting the soil solution into the microfluidic unit; the micro-fluidic unit is used for mixing and reacting the soil solution and the reagent; and the optical detection unit is used for detecting the absorbance of the reaction solution. The soil ammonium nitrogen in-situ detection device can realize in-situ detection of soil ammonium nitrogen, has high automation capability, reduces artificial participation processes, has the characteristics of high integration level, strong stability, good detection result accuracy, fast detection speed and the like, has a small size, is convenient to carry and simple and convenient to operate, and meets the requirements of soil ammonium nitrogen in-s