Soil salinization poses a growing challenge to global agriculture, reducing productivity and soil quality. A recent study published in Industrial Crops and Products explores a sustainable solution: orange peel biochar (OPB). By converting orange peel waste into biochar, researchers aim to improve crop resilience and manage agricultural waste simultaneously.

The study tested various doses of OP and OPB (0.5%, 1%, and 2%) on maize growth under three salinity levels (1.66, 4, and 8 dS m–¹). Results showed that OPB outperformed raw orange peel, with the 1% OPB dose yielding the most significant improvements. At high salinity (8 dS m–¹), 1% OPB increased maize grain yield by three times, boosted nutrient uptake (e.g., nitrogen, phosphorus, potassium), and reduced harmful sodium levels in plant tissues. It also enhanced soil enzymatic activities, such as urease (55.4%) and phosphatases, which are vital for nutrient cycling.

The findings highlight the dual benefits of OPB: improving maize growth and reducing environmental waste. OPB mitigates salinity stress by enhancing soil structure, nutrient availability, and microbial activity. This makes it a cost-effective, sustainable strategy for managing saline soils and promoting agricultural productivity.

This research underscores the potential of recycling agricultural waste like orange peels into valuable soil amendments, offering a practical approach to sustainable farming and waste management. Further studies could expand its application to other crops and environments, supporting global food security efforts.