Research Article

Compost and Crude Humic Substances Produced from Selected Wastes and Their Effects on Zea mays L. Nutrient Uptake and Growth

Figure 3

Fourier transform infrared (FTIR) spectra of crude humins from rice straw, rice husk, sawdust, and oil palm empty fruit bunch.
276235.fig.003a
(a)
276235.fig.003b
(b)
276235.fig.003c
(c)
276235.fig.003d
(d)