Yield Gap
Yield gap is the difference between the potential yield of a crop (what is biologically achievable with optimal management and weather) and the actual yield farmers obtain. Globally, yield gaps range from 20% in well-managed high-income systems to 60–80% in low-input smallholder systems. Closing yield gaps is the largest source of potential food-production growth without expanding farmland.
Comment fonctionne Yield Gap
Three yield benchmarks matter. (1) Yield potential (Yp) — the yield achievable under optimal water, nutrients, pest control, and no weather stress; determined by genetics and climate. (2) Water-limited potential (Yw) — the best achievable under rainfed conditions in a given region. (3) Actual yield (Ya) — what farmers currently produce. The yield gap is Yp − Ya (or Yw − Ya for rainfed systems), typically expressed as a percentage of potential.
Global yield gap data (Global Yield Gap Atlas, gyga.org) shows corn gaps of 15–25% in the US and EU, 40–60% in Brazil and Argentina, and 60–80% in sub-Saharan Africa. For wheat, the pattern is similar. Rice gaps are smaller (20–40%) in Asian systems but larger in Africa (50–70%). Each percentage point of gap closed is worth billions in additional food production without any new land or genetics.
The main drivers of yield gaps are nutrient management (under-fertilization in Africa, mis-timed fertilization elsewhere), water management (lack of irrigation or poor scheduling), pest and disease pressure, variety choice, and timeliness of operations. Closing 50% of the current yield gap worldwide would feed an additional 850 million people on existing cropland (Mueller et al., Nature, 2012). AI-powered farm management platforms address the management-quality component of the gap by delivering timely, data-driven recommendations on what, when, and how much to apply.
Sources
- Global Yield Gap Atlas (University of Nebraska). gyga.org.
- Mueller et al. (2012). Closing yield gaps through nutrient and water management. Nature.