Quantifying plant nutrient levels
Plants treated with 0 mM, 100 mM, and 200 mM for three days were dried
and ground, following which they were sent to the Penn State Analytical
Laboratory for ion content analysis (P, K, Ca, Mg, S, Mn, Zn, Cu, B, Al,
Fe, and Na contents) (Huang and Schulte, 1985).