Fig. 1: Biochemical components of leaf tissue.

Relationships between the normalized concentration (presented here as normalized absorbance at corresponding infrared frequencies) of biochemical components (cellulose, lignin, lipids, amides and inorganic/organic phosphates) in the leaf tissue samples of switchgrass plants and the concentration of a P- and b N- in the growth media of laboratory hydroponic experiments. “CL.Ratio” stands for the cellulose:lignin ratio.