New fertilizer coating helps vegetables survive salty soil
Guo S, Qian X, Zhang S, Wang D, Tahir MA
Soil Health
If you garden near the coast, use road-salt-treated soil, or deal with salty tap water on container plants, this points to a future where fertilizer itself helps plants cope with salt stress instead of making it worse.
Researchers wrapped urea fertilizer in two protective layers, one that slowly lets nutrients out and another made of a water-holding gel that's packed with helpful soil bacteria riding on bits of charcoal. When tested on pakchoi (a leafy green also known as bok choy) grown in salty soil, the treated plants stayed greener, held onto water better, and showed less cell damage than plants given regular fertilizer. It's an early step toward fertilizers that do double duty: feeding crops steadily while also protecting them from salt stress.
Key Findings
The hydrogel coating swelled to 424% of its original size and held onto 20.96% soil moisture after 10 days, versus just 2.35% in untreated soil
The coating lost 70.65% of its mass after 28 days, showing it breaks down gradually rather than releasing nutrients all at once
In salty soil, treated pakchoi plants had more chlorophyll, higher antioxidant enzyme activity, less lipid damage, and a lower sodium-to-potassium ratio than untreated plants
chevron_right Technical Summary
Scientists built a two-layer fertilizer coating that slow-releases urea while also feeding salt-tolerant soil bacteria to crops, helping vegetables grow better in salty soil. In pakchoi (bok choy) tests, the coated fertilizer boosted chlorophyll and stress defenses while cutting cell damage and salt buildup.
Abstract Preview
Original paper
Ethyl cellulose-alginate/poly(vinyl alcohol) dual-layer coating incorporating biochar-immobilized PGPR for controlled urea release, water retention, and plant stress resilience.
Coated controlled-release fertilizers can synchronize nutrient supply with crop demand, yet single-layer systems are often limited by poor structural integrity and restricted functionality. Here, s...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Bok choy, pak choi or pok choi is a type of Chinese cabbage cultivated as a leaf vegetable to be used as food. Varieties do not form heads and have green leaf blades with lighter bulbous bottoms instead, forming a cluster reminiscent of mustard greens. Its flavor is described as being between spi...