The dried samples from shoots and roots were powdered
by a blender and the powdered plant material
(100 mg) was burnt for 4 h at 450 ◦C. After burning,
the ashes were dissolved in 6 mol L−1 HCl overnight
and the acidic extract was filtered. The filtrate was
then analyzed for Ca2+, K+, Mg2+, Fe, Zn2+ and B
contents