What the study found
Integrated crop-livestock systems with higher crop diversity were associated with greater soil carbon and nitrogen levels and stocks in subtropical paddy fields in southern Brazil. The lowest values were found in rice monoculture.
Why the authors say this matters
The authors conclude that integrated crop-livestock systems contribute to increasing soil carbon and nitrogen and to the sustainability of rice production systems in subtropical lowlands. They also suggest these systems increase the potential for carbon sequestration, meaning the storage of carbon in soil.
What the researchers tested
The researchers evaluated long-term effects of different integrated crop-livestock systems in an eight-year field trial under no-tillage in an Albaqualf soil in southern Brazil. They compared five production systems, from rice monoculture to more diverse rotations that included soybean, corn, Sudangrass, winter ryegrass, white clover, lotus, and periods of perennial pasture with grazing animals.
What worked and what didn't
Systems with high diversity, especially S4 and S5, favored soil carbon and nitrogen contents and total stocks across all sampled layers. Labile and non-labile forms of carbon and nitrogen were also positively affected, mainly near the surface at 0–0.1 m. By contrast, the rice monocrop system had the lowest values.
What to keep in mind
The abstract does not describe detailed limitations beyond the study setting and design. The results come from one long-term trial in subtropical paddy fields in southern Brazil, so the scope described here is specific to that context.
Key points
- High-diversity integrated crop-livestock systems were linked to higher soil carbon and nitrogen stocks than rice monoculture.
- S4 and S5 performed best across the soil layers evaluated.
- Labile and non-labile carbon and nitrogen fractions were positively affected, especially in the top 0.1 m of soil.
- The study used an eight-year no-tillage field trial in southern Brazil.
- The authors say the systems may support soil carbon sequestration and rice system sustainability.
Disclosure
- Research title:
- High-diversity crop-livestock systems increased soil carbon and nitrogen
- Authors:
- Robson Bosa dos Reis, Jakeline Rosa de Oliveira, Cláudia Liane Rodrigues de Lima, Pablo Gerzson Badinelli, Júlio Kuhn da Trindade, Felipe de Campos Carmona, Rogério Oliveira de Sousa, Ibanor Anghinoni, Paulo Cesar de Faccio Carvalho, Amanda Posselt Martins, Cimélio Bayer, Filipe Selau Carlos
- Institutions:
- Universidade Federal de Pelotas, National Institute of Science and Technology for Software Engineering, Governo do Estado do Rio Grande do Sul, Univar (United Kingdom), Universidade Federal do Rio Grande do Sul
- Publication date:
- 2026-04-21
- OpenAlex record:
- View
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