Seaweed-and-chitosan gel keeps corn alive in salt-damaged soil
Wang B, Shi S, Song R, Liu B, Wu J
Soil Health
If you've watched a raised bed or border planting slowly decline from salty irrigation water or road-spray creeping in from a nearby sidewalk, a biodegradable gel made from seaweed and shellfish shells offers a promising fix that addresses the soil structure itself, not just the symptoms.
Scientists made a gel out of seaweed extract and chitosan, a natural compound from shellfish shells, then blended in charcoal and a clay mineral. The resulting material soaks up water like a sponge and helps neutralize the sodium that makes salty soils toxic to plant roots. When corn seedlings were planted in heavily salted soil treated with this gel, every single one survived the first two weeks; in untreated soil, nearly half died.
Key Findings
The composite gel absorbed 66 grams of water per gram of material and retained 55% of that capacity when tested in a 0.9% salt solution, mimicking saline field conditions
In a 15-day maize seedling trial, all treated plots achieved 100% survival versus 53.3% in untreated saline-alkali soil
An application rate of 0.8% by weight produced the most balanced seedling growth and stress-marker responses among the dosages tested
chevron_right Technical Summary
Researchers created a water-absorbing gel from seaweed extract and chitosan, reinforced with biochar and clay mineral, that dramatically reduces seedling death in salt-damaged soil. In a 15-day corn trial, every plant in treated soil survived while nearly half the seedlings in untreated saline-alkali soil died, though field-scale and long-term performance still need validation.
Abstract Preview
Original paper
A multifunctional sodium alginate/chitosan composite hydrogel for saline-alkali soil remediation: Synthesis, characterization, and proof-of-concept for promoting crop growth.
Soil salinization threatens agriculture by restricting water uptake, inducing ionic stress, and destabilizing soil structure. We developed a vapor-phase acidification method to prepare a sodium alg...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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