Pairing grain amaranth with a medicinal orchid makes cadmium cleanup pay
Li N, Cao Y, Yang L, Kang Y, Sun H
Phytoremediation
Slightly elevated cadmium in farmland soil, common near old industrial areas and some heavily fertilized fields, quietly moves into crops and accumulates in the body over decades; this pairing of plants pulls the metal out of the ground while the medicinal harvest covers cleanup costs within five years.
Some soils carry invisible loads of cadmium, a toxic heavy metal that moves into crops and can build up in the body over time. Scientists tested three plants known for pulling cadmium out of the soil and found grain amaranth did it best, by a wide margin. When they grew it alongside a valuable medicinal orchid, the two plants boosted each other: the amaranth pulled out more cadmium than it could alone, and the orchid produced cleaner, more plentiful tubers, helping the whole system cover cleanup costs three years sooner than growing amaranth by itself.
Key Findings
Grain amaranth extracted 90.94 g/ha of cadmium from contaminated soil, 9.49 times more than black nightshade and 2.60 times more than showy stonecrop in the same field trial.
Intercropping reduced cadmium concentration in Bletilla striata tubers by 25.64% while increasing equivalent tuber yield by 35.52% compared to monoculture.
The intercropping system reached full cost recovery within five years, versus eight years for grain amaranth monoculture, in a ten-year economic assessment.
chevron_right Technical Summary
Growing grain amaranth alongside the medicinal orchid Bletilla striata on cadmium-contaminated farmland removes more heavy metal from the soil and produces higher-yielding, cleaner medicinal tubers than either crop grown alone, with the combined system recovering costs three years faster than single-crop remediation.
Abstract Preview
Original paper
Field phytoremediation of slightly cadmium-contaminated farmland by intercropping Amaranthus hypochondriacus with the medicinal crop Bletilla striata: remediation efficiency and cost-benefit assessment.
Phytoremediation is a promising approach for remediating cadmium (Cd)-contaminated farmland, but its application is often limited by long remediation periods and low economic returns. Integrating C...
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