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Grant number: 22/15939-0
Support Opportunities:Regular Research Grants
Duration: October 01, 2023 - September 30, 2025
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:Dirceu Maximino Fernandes
Grantee:Dirceu Maximino Fernandes
Host Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
Associated researchers:Angélica Cristina Fernandes Deus


Phosphorus (P) in weathered tropical soils is a challenge for agriculture, due to the low efficiency of fertilization because the phosphate anion is easy to form complexes with oxides and hydroxides of iron and aluminum present in these soils, which makes it unavailable to plants. Silicon (Si) is a beneficial element used to reduce biotic and abiotic stresses in plants, however, it is little known as Si can interfere with P dynamics in weathered tropical soils. In this sense, the objective of this study is to evaluate the effect of silicon over time on P dynamics in weathered tropical soils, the effect of P and Si on development, P and Si contents and grain yield, as well as residual effect of P and Si in rice plants. To achieve these objectives, five experiments will be conducted. All experiments will receive increasing rates P (0, 50, 100 and 200 mg dm-3) combined with four rates of Si (0, 240, 480 and 960 mg dm-3), thus a 4x4 factorial with four replications. In the first two experiments the soil will be incubated for 15, 30, 90, 180, 270 and 360 days and the chemical fractionation of P, the contents of total and soluble Si, pH and solid speciation of P and Si by XAS/XANES will be evaluated. In addition, after 360 days, the response of rice plants as a function of P and Si will be evaluated after this incubation period. The third and fourth experiment will receive the same treatments and rice plants will be grown for grain development and yield, while the fifth experiment will be conducted with the residue of the treatments applied in previous experiments and will verify the development and yield of the grains. (AU)

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