Bacteria transform bean crop waste into long-lasting, low-runoff fertilizer
Trakarnphairot M, Anusaraporn S, Tresubsunthorn C, Dolphen R
Composting
If you compost at home, this research points toward a future where specific bacterial inoculants could turn your garden trimmings into a richer, slower-releasing fertilizer than anything you can buy off the shelf.
After mung beans are harvested, the leftover stalks and leaves usually get burned or thrown away, wasting the nutrients stored in them. Scientists found that certain bacteria, when added during composting, can quickly break down that tough plant material and transform the phosphorus and other minerals into stable crystals that don't wash away in rain. The resulting compost released nutrients slowly to plants and lost far less potassium, phosphorus, and magnesium to leaching than ordinary compost.
Key Findings
Bacterial inoculants reduced the carbon-to-nitrogen ratio from 39.86 to under 20 within 40 days, signaling rapid compost maturity
Bacteria-produced extracellular polymeric substances triggered formation of stable phosphate mineral phases (magnesium ammonium phosphate and calcium/potassium pyrophosphates) confirmed by X-ray diffraction
Potassium leaching loss was as low as 0.31% and phosphorus loss 13.61% in the best treatment, substantially below unmanaged compost
chevron_right Technical Summary
Researchers turned leftover mung bean plant waste into a slow-release fertilizer by using specific soil bacteria that break down tough plant fibers and lock nutrients into stable mineral crystals, cutting nutrient runoff and boosting plant growth.
Abstract Preview
Original paper
Microbial valorization of mung bean residues into a slow-release multi-nutrient biofertilizer via EPS-mediated phosphate biomineralization.
Agricultural biomass valorization is a critical component of the circular bioeconomy for improving resource efficiency and sustainable nutrient management. Large quantities of mung bean (Vigna radi...
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The mung bean or green gram is a plant species in the legume family. It is mainly cultivated in East, Southeast, and in South Asia and used as an ingredient in both savoury and sweet dishes.