Cleiton H. Sequeira
USDA NRCS-National Soil Survey Center
100 Centennial Mall North, Rm 416, Lincoln, NE 68508-3866
Mobile: 540-553-4410
[email protected]
Education
Doctor of Philosophy, Crop and Soil Environmental Sciences, February 2011
Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA
Dissertation: Soil organic matter dynamics in cropping systems of Virginia’s Valley region
GPA: 3.78/4.0
Master of Science, Soil and Plant Nutrition, October 2007
Universidade Federal de Viçosa, Viçosa, MG, Brazil
Thesis: Availability of micronutrients in soils and its relationship with foliar contents in young
Eucalyptus stands
GPA: 3.0/3.0
Bachelor of Science, Agronomy, July 2004
Universidade Federal de Viçosa, Viçosa, MG, Brazil
Research
Experience
Rapid Assessment of U.S. Soil Carbon for Climate Change and Conservation Planning
Project – University of Nebraska-Lincoln in partnership with USDA NRCS-National Soil
Survey Center (March 2011 – Present)
Development of Visible Near Infrared (VNIR) models to predict soil properties such as
organic carbon, cation exchange capacity, and clay content
Evaluation of soil property and landscape effects on soil carbon dynamics
Evaluation of ecosystem properties and agricultural management effects on carbon
dynamics
Assist with general project oversight, database design, troubleshoot, quality assurance,
quality control, and data management
Provide training, reporting, communication, and publicity of the project
Produce a nationwide inventory of soil carbon stocks in the U.S.
Nitrate and Phosphate Leaching Losses in Agronomic Crop Production in the Virginia
Coastal Plain – Virginia Tech (January 2008 – December 2010)
Collection, in monthly basis, of leached water from 24 passive capillary lysimeters located
on two commercial farms
Analysis of the water samples for nitrate and phosphate
Collection of yield samples for wheat, soybean, and corn in the experiment sites
Maintenance of the lysimeters
Data analysis to compare amounts of nitrate and phosphate leached through soil profile due
to tillage and crop rotation treatments
Influence of Cropping Systems on Carbon Sequestration in Virginia Soils – Virginia Tech
(January 2008 – December 2010)
Preparation of the research project
Collection of soil samples from 19 sites around the state of Virginia to determine total
organic carbon and nitrogen contents
Conducted laboratory analysis and supervision of one undergrad student
Data analyses to compare the effect of tillage and crop rotation on soil total organic carbon
and nitrogen contents at 0-5, 5-15, 15-30, and 30-60 cm depths for the 19 sites
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Role of Soil Organic Matter as Source of Nitrogen in Commercial Corn Production –
Virginia Tech (January 2008 – December 2010)
Preparation of the research project
Collection of soil samples from 11 sites in Virginia without nitrogen applied and
determination of their nitrogen contents by different methods
Collection of whole-corn plant samples from the 11 sites at R4-R5 growth stages and
determination of nitrogen contents
Conducted laboratory analysis and supervision of two undergrad students
Fitting of simple and multiple linear regression models to predict residual nitrogen
availability to corn plants
Actives Fractions of Soil Organic Matter as Indices of Soil Change due to Management
Practices – Virginia Tech (January 2008 – December 2010)
Preparation of the research project
Collection of soil samples from an agronomic experiment located in the Valley region of
Virginia
Conducted analyses to determine carbon and nitrogen contents into different fractions of
soil organic matter and supervision of one undergrad student
Data analysis to determine the most sensitive organic fraction to changes in soil due to crop
rotation, tillage, and cover crop management
Research Assistant – Virginia Tech (May 2008 – August 2010). Under supervision of Dr.
Marcus M. Alley
Supported field experiments: layout, planting, treatments application, and harvesting
Literature review, data analysis, and preparation of reports and posters
Availability and Supply of Micronutrients in Eucalyptus Stands – Universidade Federal de
Viçosa (July 2005 – October 2007)
Preparation of the research project
Collection of soil and eucalypt leaves samples from the 27 sites throughout the state of
Minas Gerais, Brazil
Conducted analyses to determine copper, zinc, manganese, and iron contents in soil and
plant samples
Supervision of one undergrad student
Data analysis to determine the best extractant of micronutrients to eucalypt under
supervision of Dr. Júlio C.L. Neves
Effects of Weeds Root Exudation and Drift of Glyphosate on Eucalyptus Growth –
Universidade Federal de Viçosa (September 2004 – January 2005)
Support in installing and conducting greenhouse experiments
Support in laboratory analyses
Support in the publication of scientific papers (literature review and writing)
Undergrad Research – Universidade Federal de Viçosa (June 2002 – June 2003). Under
supervision of Dr. Nairam F. Barros
Conducted a greenhouse experiment designed to evaluated the agronomic efficiency and
impact on soil of five industrial sludge
Determination of heavy metals in both soil and corn samples
Data analysis under supervision of Dr. Júlio C.L. Neves
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Teaching
Experience
Teaching Assistant – Virginia Tech (fall 2010). Under supervision of Dr. Steven Hodges
Direction of lab sections of the senior level Soil Fertility and Management class
Worked one-to-one with students on problems and concepts
Replaced the main instructor in one lecture so far
Preparation of exams
Grading quizzes and exams
Teaching Assistant – Virginia Tech (spring 2008). Under supervision of Dr. James R.
McKenna.
Management of the multimedia lab of the Agronomic Crops, and World Crops and
Cropping Systems classes
Worked one-to-one with students on problems and concepts
Grading quizzes and exams
Internships
Votorantim Celulose e Papel (VCP) – Votorantim Cellulose and Paper, Luíz Antônio, SP,
Brazil (May 2002 – June 2002).
Conducted sampling, measurements, and maintenances in the irrigated forest project
Maintenance of the clone propagation center
Instituto Agronômico de Campinas (IAC) – Sugarcane Advanced Technology Research
Center, Ribeirao Preto, SP, Brazil (September 2002 – November 2002).
Supported the planting and harvesting breeding plots
Evaluation of yield and disease trials
Supported in answering questions to the public about specific IAC’s varieties
native
fluent
moderate
Languages
Portuguese
English
Spanish
Computer
Skills
Microsoft Office 2007 (Word, Excel, Access, PowerPoint)
R, SAS, JMP, R, Minitab, and STATISTICA
Geographic Information System (GIS)
Awards/
Affiliations
Gama Sigma Delta – The Honor Society of Agriculture, 2011- present
Samuel Obenshain Graduate Scholarship Award 2009
Master of Science CAPES fellowship research, 2005 - 2007
American Society of Agronomy, 2008 - present
Crop Science Society of Agronomy, 2008 - present
Soil Science Society of America, 2008 - present
Publications
Spargo, J., M. Cavigalli, J. Maul, C.H. Sequeira, M.M. Alley, and R. Follet. 2012.
Changes in soil organic carbon and nitrogen fractions with duration of no-tillage
management. Soil Science Society of America Journal. (Under review)
Sequeira, C.H. and M.M. Alley. 2011. On-farm effects of tillage on soil organic
matter levels in the Shenandoah Valley Region of Virginia. Agronomy Journal. (Under
review)
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Sequeira, C.H. and M.M. Alley. 2011. Soil organic matter fractions as indices of soil
quality changes. Soil Science Society of America Journal, 75:1766-1773.
Sequeira, C.H., N.F. Barros, J.C.L. Neves, R.F. Novais, I.R. Silva, and M.M. Alley.
2011. Micronutrient soil-test levels and Eucalyptus foliar contents. Communications in
Soil Science and Plant Analysis, 42:475–488.
Sequeira, C.H., M.M. Alley, and B.P. Jones. 2011. Evaluation of potentially labile
soil organic carbon and nitrogen fractionation procedures. Soil Biology &
Biochemistry, 43: 438–444.
Santos, L.D.T., C.H. Sequeira, N.F. Barros, F.A. Ferreira, and L.R. Ferreira. 2007.
Growth and concentration of nutrients in the aerial tissue of eucalypt under glyphosate
drift effect. Revista CERNE, 13:347-352.
Sequeira, C.H., M.S. Barbosa, H.E.P. Martinez, P.R.G. Pereira, and P.C.R. Pereira.
2006. Fontes. The effect of foliar applications of calcium and titanium tetrachloride
upon the occurrence of “Tip burn” in lettuce plants. BioScience Journal, 22:7-16.
Santos, L.D.T., F.A. Ferreira, N.F. Barros, C.H. Sequeira, I.C. Santos, and A.F.L.
Machado. 2005. Root exudation of glyphosate by Brachiaria decumbens and its effects
on eucalypt plants and microbial soil respiration. Revista Planta Daninha, 23:143-152.
Abstracts
Sequeira, C.H., E. Benham, R. Feguson, D. Harms, S. Kenneth, Z. Libohova, S.
Monteith, C. Seybold, L. West, and S. Wills. 2011. U.S. soil carbon assessment with
VNIR diffuse reflectance spectroscopy. In 2011 ASA-CSSA-SSSA International
Annual Meetings. San Antonio, TX.
Wills, S., L. West, and C.H. Sequeira. 2011. Sample design for national carbon stock
assessment. In 2011 ASA-CSSA-SSSA International Annual Meetings. San Antonio,
TX.
Sequeira, C.H. and M.M. Alley. 2010. Labile fractions of soil organic matter as
indices of soil change associated with management practices. In 2010 ASA-CSSASSSA International Annual Meetings abstracts. Long Beach, CA.
Sequeira, C.H., M.M. Alley, and B.P. Jones. 2009. Sodium iodide and sodium
polytungstate solutions for recovering free light fraction soil organic matter. In 2009
ASA-CSSA-SSSA International Annual Meetings abstracts. Pittsburgh, PA.
Spargo, J., M.M. Alley, C.H. Sequeira, S.B. Mirsky, and J.V. Wallace. 2009.
Influence of tillage on nitrate leaching losses in the Virginia Coastal Plain. In 2009
ASA-CSSA-SSSA Inernational Anual Meetings abstracts. Pittsburgh, PA.
Sequeira, C.H., J. Spargo, and M.M. Alley. 2009. Nitrate leaching in n-tillage versus
tilled fields. In 2009 Virginia Water Research Conference. Richmond, VA.
Oliveira, F.C.C., C.H. Sequeira, N.F. Silva, and N.F. Barros. 2009. Disponibilidade
de boro em solos do estado de Minas Gerais e seus teores foliares em plantas jovens de
eucalipto (Availability of boron in soils of the state of Minas Gerais and its foliar
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contents in young eucalypt plants). In XXXII Congresso Brasileiro de Ciência do Solo.
Fortaleza, CE.
Sequeira, C.H., N.F. Barros, and M.M. Alley. 2008. Availability of micronutrients in
soils and its correlation with foliar contents in young plantations of Eucalyptus. In
2008 ASA-CSSA-SSSA International Annual Meetings abstracts. Houston, TX.
Barbosa, M.S., C.H. Sequeira, L.M. Alvarenga, and H.P. Martinez. 2005. Efeito da
aplicação foliar de cálcio e tatracloreto de titânio sobre a ocorrência de “Tip Burn” em
plantas de alface (The effect of foliar applications of calcium and titanium
tetrachloride upon the occurrence of “Tip burn” in lettuce plants). In VI Simpósio
Latino Americano de Ciência de Alimentos. Campinas, SP.
Barbosa, M.S., J.G. Barbosa, J.A.S. Grossi, S.A. Tinoco, M.A. Muniz, C.H. Sequeira,
A.F. Santos, and M. Raimundo. 2004. Produção e qualidade de crisântemo de vaso em
função da aplicação parcelada de fósforo (Yield and quality of chrysanthemun in pots
due to splited application of phosphorus). In 2004 Fórum Latino-Americano sobre
Plantas Ornamentais. Nova Petrópolis, RS.
Santos, L.D.T., F.A. Ferreira, N.F. Barros, L.R. Ferreira, C.H. Sequeira, and A.F.L.
Machado. 2004. Simulação de deriva do glyphosate em eucalipto (Simulation of
glyphosate drift in eucalyptus). In XXIV Congresso Brasileiro da Ciência das Plantas
Daninhas. São Pedro, SP.
Sequeira C.H., L.D.T. Santos, N.F. Barros, F.A. Ferreira, and L.R. Ferreira. 2004.
Crescimento e concentração de nutrientes na parte aérea de eucalipto sob efeito da
deriva do glyphosate (Growth and concentration of nutrients in the aerial part of
eucalypt under the effect of glyphosate drift). In FERTBIO 2004. Lages, SC.
Santos, L.D.T., R.M.S.A. Meira, F.A. Ferreira, C.H. Sequeira, N.F. Barros, and L.R.
Ferreira. 2004. Efeito de subdoses crescentes de glyphosate na morfoanatomia de
eucalipto (Effect of crescent rates of glyphosate on the morphoanatomy of eucalypt).
In LV Congresso Nacional de Botânica. Viçosa, MG.
Santos, L.D.T., R.M.S.A. Meira, F.A. Ferreira, C.H. Sequeira, N.F. Barros, and L.R.
Ferreira. 2004. Anatomia foliar do eucalipto sob efeito de subdoses de glyphosate
simulando deriva (Foliar anatomy of eucalypt under effect of different rates glyphosate
drift). In LV Congresso Nacional de Botânica. Viçosa, MG.
Santos, L.D.T., R.A.S. Tiburcio, F.A. Ferreira, J.B. Santos, C.H. Sequeira, and A.F.
Machado. 2004. Efeito do glyphosate na respiração microbiana de dois solos
cultivados com eucalipto (Effetc of glyphosate on micobial respiration of two soils
cultivated with eucalypt). In III Simpósio de Meio Ambiente. Viçosa, MG.
Sequeira, C.H., N.F. Barros, J.C.L. Neves, F.P. Leite, J.L. Teixeira, and R.F. Novais.
2003. Eficiência agronômica e efeito no solo de resíduos da indústria de celulose.
(Agronomic efficiency of cellulose industry residues and their effect on soil). In XXIX
Congresso Brasileiro de Ciência do Solo. Ribeirão Preto, SP.
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Oral
Presentations
U.S. soil carbon assessment with VNIR diffuse reflectance spectroscopy. In 2011
ASA-CSSA-SSSA International Annual Meetings. San Antonio, TX.
Labile fractions of soil organic matter as indices of soil change associated with
management practices. In 2010 ASA-CSSA-SSSA International Annual Meetings.
Long Beach, CA.
Sodium iodide and sodium polytungstate solutions for recovering free light fraction
soil organic matter. In 2009 ASA-CSSA-SSSA International Annual Meetings.
Pittsburgh, PA.
Nitrate leaching in no-tillage versus tilled fields. In 2009 Virginia Water Research
Conference. Richmond, VA.
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