EFFECTS OF SOIL MOISTURE CONTENT ON ABSORBANCE SPECTRA OF SANDY SOILS IN SENSING PHOSPHORUS CONCENTRATIONS USING UV-VIS-NIR SPECTROSCOPY

Abstract

ABSTRACT. This study was conducted to investigate the effects of soil moisture content on the absorbance spectra of sandy soils with different phosphorus (P) concentrations using ultraviolet (UV), visible (VIS), and near-infrared (NIR) absorbance spectroscopy. Sieve sizes were 125, 250, and 600 �m for fine, medium, and coarse, respectively. The medium size of th