The invention discloses a method for remediating acid / heavy
metal cadmium composite polluted soil by using
Pennisetum hydridum. The method comprises the following steps: plowing polluted soil, and planting
Pennisetum hydridum in low ridges from March, wherein
irrigation and
fertilizer application are performed or not performed in the complete
growing season; and three months after planting, starting reaping the aerial part of
Pennisetum hydridum once a month, incinerating the reaped substance by a conventional method, and extracting the heavy
metal and
fertilizer, thereby achieving the goal of remediating acid / heavy
metal cadmium composite polluted soil. Pennisetum hydridum is a
perennial herb; and by continuously planting the Pennisetum hydridum on the heavy metal
cadmium polluted soil and continuously reaping the aerial part, the heavy metal cadmium in the soil is continuously extracted and transferred, and the pH value of the soil is changed until the soil achieves the
environmental safety standard. The Pennisetum hydridum, which has the advantages of high
biomass of the aerial part and developed
root system, can absorb and fix abundant
heavy metals, can retain water and protect soil, enhances the green level of the polluted area, and has favorable economic benefit, social benefit and ecological effect.