Sensors, Vol. 18, Pages 3129: Development of an Apparatus for Crop-Growth Monitoring and Diagnosis

Sensors, Vol. 18, Pages 3129: Development of an Apparatus for Crop-Growth Monitoring and Diagnosis Sensors doi: 10.3390/s18093129 Authors: Jun Ni Jingchao Zhang Rusong Wu Fangrong Pang Yan Zhu To non-destructively acquire leaf nitrogen content (LNC), leaf nitrogen accumulation (LNA), leaf area index (LAI), and leaf dry weight (LDW) data at high speed and low cost, a portable apparatus for crop-growth monitoring and diagnosis (CGMD) was developed according to the spectral monitoring mechanisms of crop growth. According to the canopy characteristics of crops and actual requirements of field operation environments, splitting light beams by using an optical filter and proper structural parameters were determined for the sensors. Meanwhile, an integral-type weak optoelectronic signal processing circuit was designed, which changed the gain of the system and guaranteed the high resolution of the apparatus by automatically adjusting the integration period based on the irradiance received from ambient light. In addition, a coupling processor system for a sensor information and growth model based on the microcontroller chip was developed. Field experiments showed that normalised vegetation index (NDVI) measured separately through the CGMD apparatus and the ASD spectrometer showed a good linear correlation. For measurements of canopy reflectance spectra of rice and wheat, their linear determination coefficients (R2) were 0.95 and 0.92, respectively while the root mean sq...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research