Soil pH value, organic matter and macronutrients contents prediction using optical diffuse reflectance spectroscopy
VIS/NIR DRS proves to be an ideal tool for estimating soil pH value and OM content. The preprocessing methods including MSC and SG filter present preferable results. Two spectrometers with different light-splitting principles show comparable results. A scanning grating spectrometer is preferable for designing an on-the-go soil sensor.
soil precision fertilizer near infrared spectroscopy principal component regression