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Grant number: 12/18226-2
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): December 01, 2012
Effective date (End): March 16, 2016
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:José Lavres Junior
Grantee:Fernando Giovannetti de Macedo
Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil


Elements currently considered micronutrients, nickel (Ni) was the last to have proven its essentiality. Its only function recognized is related to urease activity, however, presents range very narrow between critical and toxic levels. Also in the soil, the Ni addition does not show constant results, varying mainly as to environment, the plant species and the source by which it was applied, which leads us to do more specific studies. In this context, the aim of this study is to evaluate the effect of Ni in soil-plant system through experiment consisted of completely randomized pots, in 2 x 5 factorial design and seven replicates. The first factor is composed of two base saturations (50 to 70%), and the second of five Ni rates (0, 0.1, 0.5, 1.0 and 10.0 mg dm-3 of soil). The pots will be filled with 10 dm3 of land and planted with soybeans (first experiment) and after that planted with sunflower (second experiment). At 30 and 60 days after emergence of each crop will be evaluated agronomic traits: plant height, stem diameter, number of nodes, and phenological stage, head diameter (Sunflower). In the R1 stage, will be collected: whole plants from three pots of each treatment and; rhizosphere soil samples. In plants collected, will be separated: leaves; roots (Nodule) and stem. Be determined in the leaves of soybean and sunflower diagnostic: the contents of macroand micronutrients; activity of nitrate reductase, and urease and organic acids: oxalic, malonic, succinic, malic, tartaric, fumaric acid, oxaloacetic, lactic and citric. Will be evaluated ultrastructural nodules and stems by transmission electron microscopy. In soil, will be determined: urease activity, Ni semitotal and phytoavailability by methods: Mehlich 1 and 3, and DTPA. At physiological maturity period of each culture will be performed to harvest the plants remaining pots to determine productivity, Ni accumulation in whole plant and Ni and nitrogen (N) accumulation in grains. At the end of these two experiments will be collected the soil for evaluate the Ni sequential extraction. The results will be submitted to analysis of variance. Where the F test is significant at 1 or 5% probability, comparison test will be applied medium to 5% probability. There will also be correlations between nickel rates x variables evaluates.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE MACEDO, FERNANDO G.; BRESOLIN, JOANA D.; SANTOS, ELCIO F.; FURLAN, FELIPE; LOPES DA SILVA, WILSON T.; POLACCO, JOE C.; LAVRES, JOSE. Nickel Availability in Soil as Influenced by Liming and Its Role in Soybean Nitrogen Metabolism. FRONTIERS IN PLANT SCIENCE, v. 7, . (12/18226-2)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MACEDO, Fernando Giovannetti de. Nickel availability on soil-plant system: effects of Ni rates and saturations base. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB) Piracicaba.

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