Preparation and characterization of physical crosslinked nanochitin/urea hydrogels via heat treatment for agricultural applications.
Zhang T, Wang C, Bao Y, Xu H, Liu S
Soil Health
A slow-release fertilizer made from seafood waste could let your vegetable bed feed itself steadily all season instead of getting one big nutrient flood that washes away in the next rain.
Scientists took tiny fibers from chitin — the stuff crab and shrimp shells are made of — and mixed them with urea (a common fertilizer). When heated, the urea breaks down and causes the fibers to tangle together into a spongy gel. When that gel was added to soil, it fed beneficial bacteria and helped the soil grab more carbon from the air and release more phosphorus for plant roots.
Key Findings
The chitin-urea hydrogel reached a mechanical strength of up to 3500 Pa at 2 M urea concentration and pH 4, making it robust enough for soil handling.
Soil amended with the hydrogel showed ~35–40% increases in beneficial bacteria populations (Actinobacteria and Bacillus) after 30 days.
Functional soil genes linked to carbon fixation and phosphorus solubilization increased by 39.5% and 33.0% respectively, suggesting improved nutrient cycling.
chevron_right Technical Summary
Researchers made a gel from shrimp-shell fibers and urea that slowly releases nutrients into soil, boosting beneficial microbes and their ability to capture carbon and unlock phosphorus by roughly 30–40% over 30 days.
Abstract Preview
This study employed deacetylated nanochitin (NCh) and urea to fabricate chitin-based hydrogels via a heat-treatment (121 °C,1 h). The gel formation was attributed to heat-triggered urea decompositi...
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