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A study on nickel application methods for optimizing soybean growth
Bruna Wurr Rodak1,2, Douglas Siqueira Freitas3, Monica Lanzoni Rossi4
1Department of Agronomy, São Paulo Western University, Presidente Prudente, São Paulo, 19067-175, Brazil. bruwurr@gmail.com.
Scientific Reports
|May 8, 2024
Summary
Nickel fertilization enhances soybean yield and nitrogen metabolism. Integrated application methods, combining soil, seed, or leaf treatments, proved most effective for optimizing this micronutrient
Area of Science:
- Agricultural Science
- Plant Physiology
- Soil Science
Background:
- Nickel (Ni) is a vital micronutrient for plant development, particularly in nitrogen (N) metabolism via urease and NiFe-hydrogenase.
- Ni application is an emerging agricultural practice, but its efficacy is highly dependent on the chosen method.
Purpose of the Study:
- To investigate the effects of different nickel (Ni) application methods on soybean plants.
- To evaluate the combined and individual impacts of seed treatment, leaf spraying, and soil fertilization under varied edaphoclimatic conditions.
Main Methods:
- Soybean plants were subjected to various Ni application strategies: seed treatment, leaf spraying, and soil fertilization, individually and in combination.
- Experiments were conducted under both field and greenhouse conditions to assess edaphoclimatic influences.
Main Results:
- Soil, Soil + Leaf, and Seed + Leaf Ni treatments significantly improved biological nitrogen fixation (7-20%), ureides (1.5-fold), shoot dry weight (14%), and yield (up to 1161 kg ha⁻¹).
- All Ni application methods increased SPAD index (1.1-fold), photosynthesis (1.2-fold), nitrogenase (1.4-fold), and urease activity (3.9-fold).
- Edaphoclimatic conditions influenced treatment effectiveness, with integrated approaches showing superior yield enhancement.
Conclusions:
- Integrated Ni application strategies, particularly leaf application combined with soil or seed fertilization, are most effective for boosting soybean yield.
- Determining the optimal Ni application method is crucial for efficient micronutrient uptake and utilization, promoting sustainable agricultural technology.
- Further research is needed to establish official guidelines for Ni application in agriculture.
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