China's Geo-STEP model revives degraded farmland with science-backed solutions

A new geographical engineering model is helping China tackle land degradation and improve farmland quality. The Geo-STEP model, developed by Liu Yansui, offers a structured way to create stable, high-yield, and sustainable farmland. It has already been tested in Lankao county, Henan Province, where complex land issues persist due to historical flooding and the area’s location in the old course of the Yellow River. Geo-STEP combines geography-based Science, Technology, Engineering, and Practice into a closed-loop system. It begins with scientific diagnosis of soil profiles, followed by engineering design and localised implementation. This four-step approach has been applied in Lankao to address land degradation and boost farmland productivity.

The model provides a diagnostic framework and modular technology system to help regions assess and solve land problems. Its success in Lankao suggests it could be expanded to other parts of China and the Global South. Nationwide, China has already built or upgraded over 1 billion mu (66.67 million hectares) of high-standard farmland. The Lankao case demonstrates how Geo-STEP can transform farmland governance. By integrating science and practical solutions, the model offers a scalable method for improving land quality. Countries facing similar challenges may adopt this approach to enhance agricultural sustainability.