Crop diversification protects Brazilian farms from extreme weather
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Researchers from the Center for Carbon Research in Tropical Agriculture (CCARBON) at the University of São Paulo (USP) found that diversifying crops and using cover crops protects fields against droughts and floods while increasing productivity.
The team analyzed 13 experiments on commercial farms in Rio Grande do Sul, Brazil, a region that produces 8.4% of the national grain supply.
The study took place between 2022 and 2025, a period characterized by severe weather extremes including droughts with rainfall 54% below normal and floods that caused billions of reais in crop losses. Farmers who used a variety of cover crops and rotated different species achieved yields up to 76% above the state average with consistent stability year to year.
In contrast, farmers following a traditional model of continuous single-crop cultivation saw yields only 8% above the average and experienced sharp fluctuations in production, ranging from 33% to 39% higher or lower depending on the year. The researchers linked these results to biological structuring, where diverse root systems create natural tunnels called biopores. These tunnels improve water storage and allow the roots of main crops like soybeans or corn to reach moisture in deeper soil layers during dry periods.
The study also noted that extreme disasters can still impact sustainable practices. During the 2024 floods in Rio Grande do Sul, nearly half of the farmers who used crop diversification had to abandon their cover crops to plant commercial wheat to recover from waterlogged soil and harvest delays. Mauricio Roberto Cherubin, a professor at the University of São Paulo, stated that healthy soil with a wide variety of roots acts as a natural shock absorber against weather instability.
