Salinity injury — commonly known as salt stress — is one of the most severe abiotic stresses affecting rice production, especially in coastal and brackish areas of the Mekong Delta. When rice plants are exposed to high salt concentrations in soil or irrigation water, growth is stunted, leaves turn yellow or brown, and yields decrease significantly.
Understanding effective prevention and control measures helps farmers protect rice crops, maintain plant health, and secure better yields.
1. Symptoms of Salinity Injury
Typical signs of salinity injury in rice include:
Leaf tip burning and yellowing that progresses inward.
Stunted plant growth compared to healthy neighboring plants.
Poor tillering and reduced root development.
Lodging and crop failure under severe salt stress.
Visual symptoms often appear first on the youngest leaves and gradually expand to older leaves.
2. Causes and Risk Factors
Rice suffers from salt stress under conditions such as:
- High salt content in irrigation water or soil
Salinity increases when rice fields receive brackish or saline river water, especially during dry seasons or low river flow.
- Evaporation and capillary rise
When field surface water evaporates, salts rise toward the soil surface and accumulate where roots absorb nutrients.
- Poor field drainage
Stagnant water prevents salt leaching away, further concentrating salt in the root zone.
3. Prevention and Field Management
A. Water management (key priority)
- Flush fields with freshwater before transplanting and at early stages to leach accumulated salts.
- Maintain shallow water levels after flushing to prevent salt influx from below.
- Avoid exposing soil to high evaporation during midday; maintain a thin layer of water to reduce salt accumulation.
B. Field preparation
- Build raised beds and good drainage channels to help leach salts below the root zone.
- Ensure effective inlets and outlets to control saltwater intrusion.
C. Variety selection
Choose salt-tolerant rice varieties suited for coastal areas whenever available.
D. Balanced fertilization
- Avoid excessive nitrogen.
- Increase potassium and calcium to help plants tolerate salt stress.
- Add organic matter to improve soil structure and water retention.
4. Use of Amendments and Support Products
To minimize salt stress effects and support plant recovery:
Cropboost AP (biological solution):
- Stimulates root growth
- Improves nutrient absorption and plant vigor
- Enhances stress tolerance under adverse conditions
Apply Cropboost AP during early salinity stress periods according to technical recommendations to boost plant resilience and support growth.
5. Monitoring and Timely Intervention
- Walk fields frequently to detect early symptoms of salt injury.
- Adjust water levels rapidly when salinity increases.
- Combine cultural practices with appropriate support solutions to reduce stress effects.
Conclusion
Salinity injury significantly reduces rice productivity if left unmanaged. However, using the right combination of water management, field preparation, crop nutrition, and biological support products helps rice plants overcome salt stress and maintain healthy growth.
📞 For detailed technical guidance and product recommendations, contact Minh Long Agro’s advisory team or your nearest authorized dealer.
MINH LONG AGRO CO., LTD.
📍 Address: 137 Tran Xuan Soan Street, Tan Thuan Ward, Ho Chi Minh City
📞 Hotline: 1900 8982
🌐 Website: www.minhlongagro.com
