As climate change, soil degradation, and water scarcity challenge agriculture, scientists are seeking new ways to help crops grow better. Researchers from Nazarbayev University's National Laboratory Astana have found a promising solution. They propose using biodegradable hydrogel coatings made from natural polymers to improve seed performance.
A New Approach to Seed Coatings
The research focuses on hydrogel formulas made from starch and carboxymethyl cellulose. These are both natural and biodegradable materials. The hydrogels are designed to soak up and hold water, then slowly release it to seeds as they sprout. This is especially helpful in dry areas where young seedlings struggle to grow.
Unlike many common superabsorbent materials, which often come from petroleum, these new hydrogels are mostly bio-based. The team created hydrogels using different amounts of starch and carboxymethyl cellulose. They then studied their structure, how much water they could absorb, how well they broke down, and their effect on sugar beet seed growth.
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The hydrogels could absorb up to 17.5 grams of water for every gram of material. Their porous structure helped with water uptake. Tests confirmed a stable, crosslinked polymer network had formed.
The materials also broke down well, with about 67% degrading in soil during the study.
When used as a seed coating, the hydrogels improved sugar beet seedling growth. Coated seeds sprouted much better than uncoated ones. The best coatings helped seedlings grow to about 6 cm, while untreated seeds only reached about 3 cm.
The study also looked at adding wood ash to the coating. Wood ash provides important minerals like potassium, calcium, and phosphorus. The hydrogel helps keep moisture and deliver these minerals slowly to the seed. A coating with an ash–polymer–ash structure showed particularly good results.
More research is needed to make the formula stronger and to check its long-term effects and safety. However, these findings suggest that starch–CMC hydrogels could be a good option for sustainable seed coatings. They could also work as water-retaining soil conditioners and controlled-release systems in agriculture.
Why This Matters
Seed coating technology is becoming vital for sustainable farming. It helps seeds sprout, protects young plants, and uses water and nutrients more efficiently. By using natural, biodegradable materials, this research helps create farm products that work well and are good for the environment.
For places with little water or poor soil, these materials could help crops grow better. They could also reduce pollution from synthetic polymers that don't break down easily.
Deep Dive & References
- Biopolymer-based hydrogel formulations for improved seed coating performance - Scientific Reports, 2025
