Calcium application enhances yield and phytoremediation efficiency of Pueraria thomsonii Benth in cadmium-contaminated soils.
Li X, Luo X, Fang X, Wu L, Wang B
Phytoremediation
If you're growing edible plants near old industrial sites, roadsides, or anywhere soil quality is suspect, this finding shows that a simple calcium amendment — the same mineral that feeds your vegetable garden — can act as a shield between heavy-metal contamination and the food on your table.
Researchers grew arrowroot plants (a starchy edible root crop) in soil laced with cadmium, a toxic heavy metal that can sneak into food. They found that adding calcium to the soil helped the plants shrug off the metal's damage — growing bigger, photosynthesizing better, and pulling more cadmium out of the ground. Best of all, the edible roots stayed safe to eat across all test conditions, and the optimal amount of calcium to add depended on just how contaminated the soil was.
Key Findings
Calcium application boosted arrowroot yield by 18–58% and plant biomass by 13–52% in cadmium-contaminated soils, with the optimal dose varying by contamination level.
Cadmium concentration in the edible arrowroot remained low (0.08–0.29 mg/kg) and below food-safety limits across all treatments, even in severely contaminated soil.
Calcium improved plant resilience by increasing photosynthetic rate, chlorophyll content, and antioxidant enzyme activity while reducing oxidative damage markers.
chevron_right Technical Summary
Adding calcium to cadmium-polluted soil helped kudzu vine (arrowroot plant) grow bigger, clean up more heavy-metal contamination, and still produce roots safe to eat. The right calcium dose depended on how badly the soil was contaminated.
Abstract Preview
Cadmium (Cd)-contaminated soil presents substantial risks to both agricultural sustainability and human health. Pueraria thomsonii Benth. has emerged as a promising candidate for phytoremediation, ...
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