Portable dichromatic wave spectrum spectrometer used for detecting nutrient content in crops

The invention discloses a portable dichromatic wave spectrum spectrometer used for detecting nutrient content in crops, comprising a two-channel LED light source, a photoelectric sensor, a signal amplification and regulation module, a model processing and calculating module, a storage module, an LCD display module, a GPS satellite positioning signal receiving module and an infinite transmission module. The plant blade is transmitted by the LED with two characteristic wave bands; signals are transmitted to a signal regulating circuit through the converting sampling of the photoelectric sensor; the weak signals are amplified and filtered by the signal regulating circuit, converted into digital signals through A/D conversion and transmitted into the single chip arithmetic unit for model computation; the calculation results and the position information received by the GPS signal receiver are displayed on the LCD screen. The detecting spectrometer in the invention can be used for rapidly, accurately detecting the contents of chlorophyll, moisture and nitrogen in crops with no loss in the fields, and can be combined with GPS and GIS to conveniently measure the nutrient content distribution of crops in the fields and realize job management of precision agriculture.