BIOPHYSICAL CHARACTERIZATION AND ASSESSMENT OF MAJOR AGRICULTURAL CROPS BASED ON THEIR SPECTRAL REFLECTANCE IN BUTUAN CITY, AGUSAN DEL NORTE, PHILIPPINES

อาจารย์SAJONIA Anamarie P.

Department of Agricultural and Biosystems Engineering, College of Engineering and Geosciences, Caraga State University, Ampayon, Butuan City, Philippines

อาจารย์Edgardo Ricardo Jr. B

Department of Electronics Engineering, College of Engineering and Geosciences, Caraga State University, Ampayon, Butuan City, Philippines

คำสำคัญ

Spectral reflectance, biophysical characterization, major agricultural crops, Visible Region (V.R.), and Near-Infrared Region (NIR)

บทคัดย่อ

This study demonstrates the significance of spectral reflectance in characterizing the biophysical condition of major crops in Butuan City, Agusan del Norte, Philippines. Spectral reflectance can be related to biophysical indicators of plant health. In this study, bananas, coconuts, corn, and mangos were considered, as they are major crops in Butuan City, according to the Bureau of Agricultural Statistics of the Department of Agriculture-Caraga. Reflectance spectra were measured just above the crop's canopy using an Ocean Optics USB4000 VIS-NIR. Five (5) sampling sites were visited assessed for each crop, with 100 samples measured. The setup was comprised of the sensor and associated fiber optics, that were positioned just above the canopy. A ladder and pole were used for tall trees such as coconuts and mangos. A spectrometer was connected to a laptop computer that performed the scanning procedure, displayed plots of the observed reflectance, and stored the reflectance data. The spectral measurements were performed in five modes (one on top of the canopy and four on the side of the canopy at 45๐ of separation) for bananas, coconuts, and mangos, while only three modes (one on top of the canopy and two on the side) were used for corn. Each mode involved 20 scans, the average of which represents the spectral reflectance of the sample at that particular site. For each 20-scan sequence, the average value represents the spectral reflectance of the sample at that sampling site. Each crop's average spectral reflectance curves were plotted using MS Excel 2013 to visually represent its biophysical characteristics. Based on the results, bananas, corn, and mangos had lower reflectance values in the visible region and a high reflectance value in the near-infrared region ranging from 40-70%, indication that they were heathy. However, coconuts were unhealthy indicated by their low reflectance values (10-25%) in the near-infrared region. The results were validated using field survey and yield data.

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