"Dry matter production and nutrient uptake by cover crops in Brazilian agriculture"

This study published in the scientific journal Nutrient Cycling in Agroecosystems highlights the strategic role of cover crops in Brazilian agriculture, bringing new evidence of their ability to improve soil health and contribute to more sustainable production systems. The research was conducted by scientists from the “Luiz de Queiroz” College of Agriculture (ESALQ/USP) and members of SOHMA, including Martha Lustosa Carvalho, Leonardo de Aro Galera, Raissa Siepman Scholten, Lucas Pecci Canisares, and Maurício Roberto Cherubin, and compiles data from different regions of the country to provide a broad overview of the performance of these plants under tropical and subtropical conditions.

Cover crops, also known as green manures, are used between growing seasons with the aim of protecting the soil, increasing organic matter, and promoting nutrient cycling. Despite their well-recognized benefits, their adoption in Brazil is still limited, mainly due to the lack of organized and accessible information on their performance under different conditions. With this in mind, the objective of the study was to compile and analyze data on dry matter production and nutrient uptake by different species and combinations of cover crops.

To achieve this, the researchers conducted a systematic review of the scientific literature, selecting 126 field studies carried out in Brazil, resulting in more than 1,100 observations analyzed. The article shows that different groups of cover crops perform complementary functions in agricultural systems, with grasses standing out for biomass production and soil protection, legumes for nitrogen fixation, and other families contributing to improvements in soil structure. It also shows that nutrient uptake capacity varies among species, reinforcing the importance of using mixed species. In addition, it highlights that climatic factors influence results more than soil characteristics, while also pointing out management challenges and knowledge gaps, especially regarding roots and decomposition.

Overall, the study indicates that species diversification is a key strategy to promote soil health, increase agricultural sustainability, and reduce dependence on chemical inputs.