A recent review article published in Applied Ecology and Environmental Research discusses how salt-affected soils, characterized by high salinity or sodicity, pose significant challenges to global agriculture, reducing crop yields and threatening food security. With over 800 million hectares impacted worldwide, solutions are urgently needed to reclaim these lands and support sustainable farming.

One promising approach is biochar—a carbon-rich material produced through pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of organic matter. Recent research highlights its potential to improve the physical, chemical, and biological properties of salt-affected soils. BiocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More helps by increasing soil porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More, enhancing water retention, and promoting soil aggregation, which alleviates the compaction and poor drainage common in saline soils.

Chemically, biochar acts as a buffer, reducing sodium levels and boosting essential nutrients like potassium, calcium, and magnesium. Its high cation exchange capacity improves nutrient availability, allowing plants to better withstand osmotic stress and ion toxicity caused by salinity. Additionally, biochar fosters microbial activity and enzymatic processes, further enriching the soil ecosystem.

Field studies show that biochar amendments enhance crop yields under challenging conditions. For example, rice, maize, and tomato plants treated with biochar demonstrated improved growth, increased nutrient uptake, and better resistance to salt stress. Furthermore, biochar sequesters carbon, contributing to climate change mitigation.

While the benefits are clear, challenges remain, such as optimizing biochar formulations and application rates. Long-term studies across diverse soil types and climates are needed to refine these strategies. With continued research and collaboration, biochar has the potential to transform degraded lands into productive ecosystems, ensuring a more sustainable agricultural future.

SOURCE: Dhanushkodi, et al (2025) Constraints in Salt-Affected Soil and their Management through Biochar Application: A Review. http://dx.doi.org/10.15666/aeer/2301_749767