大豆叶片氮素含量检测装置的研究

Research of the Soybean’s Total Leaf Nitrogen Determination Device

根据大豆叶片氮素含量光谱检测技术研究结果,设计了具有4个通道、两种检测模式的便携式检测装置,分别采用540nm波段冠层反射率和比值植被指数RVI检测大豆开花前期和结荚前期叶片氮素含量。该装置由敏感波段光电传感器、信号放大电路、A/D转换器和单片机系统构成。单片机系统内建立了敏感波段冠层反射率及相关植被指数与大豆氮素含量的反演模型,可直接根据冠层反射率反演出大豆叶片氮素含量,也可通过串口通讯将反射率数据传给上位机进行进一步的处理。经田间试验验证,该仪器具有质量轻、价格低、操作简便和检测精度可行等优点,可以为大豆氮肥合理施用提供指导。

This paper designed a portable soybean’s total leaf nitrogen determination device,it has 4 channels and can determine the nitrogen in tow mode according to the spectral reflection of canopy and RVI.The device includes a optoelectronic sensor,a signal amplifier,a A /D converter,a microcontroller unit system.It can give the total nitrogen content（TN） directly according to the mathematic model between spectral characteristics and TN which is built in the system.The field experiment shows that the device can identify the plants’nutrition contents in field rapidly,accurately.