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Silicon fertilization in sugarcane: rates, cultivars and water deficit

Grant number: 18/05843-0
Support type:Regular Research Grants
Duration: October 01, 2018 - March 31, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal researcher:Mônica Sartori de Camargo
Grantee:Mônica Sartori de Camargo
Home Institution: Departamento de Descentralização do Desenvolvimento (APTA Regional). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil
Assoc. researchers:Marcelo de Almeida Silva ; Margarita Luisa OSTERRIETH

Abstract

Silicon (Si) fertilization could alleviate the damage caused by water deficit in sugarcane, as it is a Si- accumulating plant, but results are still scarce in literature. This project will test the following hypothesis: a) Si deposition (silicofitolites) in the above ground part and root system increase in response to increasing silicate rates quantities applied through physiological responses to water status in the leaves and photosyntesis and increases on biomass of drought-tolerant and sensitive cultivars (phases 1, and 3); b) Is there a maximum level in Si uptake to drought-tolerant and sensitive cultivars (phase 1)? c) Is there a relationship between soluble Si in soil and Si in the plant (total and silicofitolite) in both above ground level and root system (phases 1, and 3)?; d) Si deposition in plant increase in function of water deficit and improve the drought tolerance of sugarcane cultivars (phases 2, and 3)?; e) Si increase drought tolerance throught alteration of gas exchange (transpiration), photosynthesis and water and nutrients uptake by root system in sugarcane under water deficit (phase 2)? f) Si improve drought tolerance of sensitive similar to tolerant cultivar (phase 2, and 3). Studies will be done in 3 phases. In the phase 1, an experiment will be conducted in randomized blocks including rates of Si (0, 250, 500, 750, 1000 kg ha-1 Si, two cultivars (drought- tolerant: RB86-7515; drought-sensitive: RB85-5536) and 8 repetitions. In the phase 2, same cultivars will be planted with and without Si (600 e 0 kg ha-1 Si), with and without water deficit (55% and 100% of soil moisture holding capacity, respectively), imposed in March, 2020. The experiments of phase 1 and phase 2 will be conducted from October 2018 until March 2019 and October 2019 until March 2020. Morphophysiological evaluations (height, number of green leaves, number of tillers) and non-destructive physiological evaluations will be done at 0, 7, 14, 21 and 28 days since 5 months in both phase 1 (without deficit) and phase 2 (with deficit): CO2 assimilation rate (AN), transpiration, stomatal conductance (gs), intrinsic efficiency of water use (AN/gs), concentration of CO2 in the intercellular spaces, and photochemical efficiency of photosystem II. At harvest, leaves+1 will be collected to evaluations of Si, and chlorophyl a and b, relative water content,water potential, electrolyte leakage. It will be also evaluated the above-ground part and root system biomass, Si uptake, and water use efficiency (applied water / biomass) of phase 1 and 2. In the phase 3, it will be evaluated silicofitolites deposition in the above-ground part and root system from plants collected in phases 1 and 2. (AU)

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VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)

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)
CAMARGO, MONICA SARTORI; KEEPING, MALCOLM G. Silicon in Sugarcane: Availability in Soil, Fertilization, and Uptake. SILICON, JAN 2021. Web of Science Citations: 0.
CAMARGO, MONICA SARTORI; COUTINHO, ISABEL D.; LOURENCO, SILVIA A.; SOARES, MARLI K. M.; COLNAGO, LUIZ A.; APPEZZATO-DA-GLORIA, BEATRIZ; CAVALHEIRO, ALBERTO J.; AMORIM, LILIAN. Potential prophylactic role of silicon against brown rust (Puccinia melanocephala) in sugarcane. European Journal of Plant Pathology, v. 157, n. 1 MAY 2020. Web of Science Citations: 1.

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