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Seed treatment, soil fertilization or nickel leaf-spraying consequences for biological nitrogen fixation and soybean growth

Grant number: 21/11624-1
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2021
Effective date (End): November 30, 2022
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:José Lavres Junior
Grantee:Fernando Pimenta dos Reis Arruda
Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


Biological N2 fixation (BNF) is a plant-rhizobia symbiosis fundamental for sustainable agriculture in tropical soils, usually with low nitrogen (N) availability to plants. Leguminous plants, like soybean, are the most successful case of this symbiosis. Nowadays, one of the main challenges in soybean crop systems is to improve the efficiency of the BNF, by nutritional management for plants. In its turn, it has been observed that the availability of nickel (Ni) in some soils may be insufficient to meet plant requirements, whose N assimilation occurs via ureides. In this case, Ni fertilization emerging may play a key role, for this micronutrient is a structural component of urease and NiFe-hydrogenase enzymes that are directly involved in N metabolism in plants. However, research on Ni application methods, aiming to increase the efficiency of BNF is still incipient. The research project proposes, therefore, an exploratory study on the theme, applying modern analytical techniques in the evaluation of the BNF process. Under the controlled conditions, isolated and/or combined application of Ni via seed treatment, soil, and leaf will be tested in soybean plants grown. Therefore, the infrastructure at 'Center for Nuclear Energy in Agriculture, 'São Paulo State University' will be employed. Furthermore, the project is aligned with the '2030 Agenda' of the 'United Nations to promote the 'Sustainable Development Goals. (AU)

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