FT-IR spectra of natural dried rice straw and the rice straw residue at 110 d before and after potassium (K) adsorption.

<p>Solid line A represents the infrared spectrum of natural dried rice straw. Solid lines B and C represent the infrared spectra of the rice straw at 110⁻¹ KCl solution, respectively. The data in the panel are the peak wavenumbers.