Li, et al (2024) 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 Increases Rice Yield in Soda Saline-Alkali Paddy Fields by Improving Saline-Alkali Stress and Phosphorus Use Efficiency. Agronomy. https://doi.org/10.3390/agronomy14092159

Rice cultivation in soda saline-alkali soils faces numerous challenges, such as ionic toxicity and nutrient imbalances that stifle crop growth and phosphorus uptake. A recent study investigated the use of biochar, a carbon-rich material derived from plant matter, in combination with phosphate fertilizers to address these issues in rice fields. Conducted over two years in China’s saline-alkali paddy fields, the research showed promising results.

The combined application of biochar and phosphorus significantly improved rice yields by enhancing the plant’s resistance to saline-alkali stress. Biochar reduced the concentration of harmful sodium ions (Na+), leading to a better Na+/K+ ratio, a key factor in maintaining cellular balance under stress. Moreover, biochar boosted antioxidant enzyme activity, decreased oxidative damage, and improved nutrient uptake, particularly phosphorus, which is often limited in saline conditions.

Physiologically, rice plants treated with biochar and phosphorus exhibited higher concentrations of protective compounds like proline and soluble sugars, which help them withstand osmotic stress. In addition, biochar improved the efficiency of phosphorus use, increasing its availability and absorption in the plants. This resulted in higher grain yields, with increases of up to 42% compared to untreated fields.

This study highlights biochar as a valuable tool for sustainable agriculture, particularly in degraded soils. By enhancing nutrient availability and reducing stress, biochar has the potential to significantly improve crop productivity in challenging environments like soda saline-alkali fields.