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Background:
Dr Siemens graduated from the University of Illinois,
Champaign-Urbana, IL,in 1988 with a BS in Mechanical Engineering. Four
years later, he earned his Master's Degree in Mechanical Engineering from
the same university. In 1996, Dr. Siemens was awarded a PhD in
Agricultural and Biosystems Engineering from the University of Arizona in
Tucson, AZ.
Current Research
Projects
Objective:
Identify pathways of water infiltration into soil and factors producing
high infiltration rates. Produce guidelines for high infiltration
capacity. Evaluate functional and taxonomic diversity of soil
microorganisms. Delineate soil organic matter components and their
relationship to soil quality. Develop a soil carbon model capable of using
readily available data to predict the storage or loss of soil carbon in
relation to management practice.
Approach:
Changes in soil fauna, carbon accumulation, porosity characteristics,
compaction, aggregation, and microbial activity will be investigated for
their role in water infiltration into tilled and untilled cropping
systems. Dye tracing and other techniques will be developed to identify
actual infiltration routes. Climax communities of soil microorganisms in
long-term agroecosystems will be identified using physiological and
biochemical methods. The population dynamics of selected taxa will be
determined and the activity of important microbial groups will be
measured. Carbon and nitrogen transformations in selected management
systems will be evaluated by standard analytical methods. Soil organic
matter pools will be investigated and their relationship to soil quality
evaluated. A mathematical model, in Windows format, for carbon
sequestration in agricultural soils will be developed. The model will be
based on observations from local long-term experiments and will be
validated using long-term data from sites across the USA.
Objective:
1. Quantify soil erosion, hydrology, and crop yield of two systems: a
winter wheat/fallow inversion tillage system and a no-till four-year
rotation, to evaluate the systems on a landscape basis and provide
databases for soil erosion model validation and decision support tool
development.
2. Determine the
effects of quality of carbon on soil aggregate stability; that in turn
influences surface soil hydrology, soil erosion, and crop production.
3. Improve the
economic viability of conservation farming systems by developing and
evaluating new, innovative technologies for harvesting that properly sizes
crop residue for optimum no-till drill performance and adds value by
segregating grain by quality; and for applying cropping inputs in
accordance with spatial variability in soils and landscapes to improve
grain yields and grain quality.
Approach:
A combination of plots and watershed-scale research will be used to test
working hypotheses within each of the sub-objectives. Development and
testing of a new crop rotation will be conducted using paired watersheds
and small plots to examine the effectiveness of soil and water
conservation, changes in the soil properties, and cropping system
productivity. Soil aggregate stability influences infiltration and water
retention. The influence of aggregate stability on infiltration and water
retention will be determined within the watershed research site at
specified landscape positions. Economic and efficiency improvements to
conservation farming systems will be made through the development of new
crop residue management and harvest technologies, and precision
conservation practices that overcome the inherent constraints imposed by
spatial variability in soil/crop productivity within farm fields. These
improvements will be accomplished through the use of engineering
procedures, plot research, and integration of geospatial information and
analysis technologies.
Selected
Publications:
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Small Grain Acreage and Management Trends for Eastern Oregon and
Washington
Smiley, R.W., Siemens, M.C., Gohlke, T.M., Poore, J.K. 2005. Small grain
acreage and management trends for eastern Oregon and Washington. In 2005
Dryland Agricultural Research Annual Report, 30-50. D.A. Long, S.E. Petrie
and P.M. Frank, eds. SR 1061. Corvallis, Oreg.: Oregon State University
Agric. Exp. Station in cooperation with USDA-Agric. Res. Service,
Pendleton, Oreg.
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Effects of Header Modifications on Garbanzo Bean Harvesting Losses
Siemens, M.C., Corp, M.K., Correa, R.F. 2004. Effects of header
modifications on garbanzo bean harvesting losses. ASAE paper no.
PNW04-1012, 10 pp. St. Joseph, Mich.:ASAE
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Development and Evaluation of a Residue Management Wheel for Hoe-Type
No-Till Drills
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. 2004. DEVELOPMENT AND
EVALUATION OF A RESIDUE MANAGEMENT WHEEL FOR HOE-TYPE NO-TILL DRILLS.
TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS,
47(2):397-404.
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Residue Management Wheel for Hoe-Type No-Till Drills
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. RESIDUE MANAGEMENT WHEEL FOR
HOE-TYPE NO-TILL DRILLS. ASAE PAPER NO. PNW-03-103. 6 PP. ST. JOSEPH,
MICH.: ASAE. 2004.
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Wheat Straw Management and Its Effect on Weed Populations, Stand
Establishment and Yield in Direct-Seed Cheick Peas
Corp, M.K., Ball, D.A., Siemens, M.C. 2004. Wheat straw management and its
effect on weed populations, stand establishment and yield in direct-seed
chickpea. In Proc. 57th Western Society of Weed Science Meeting, 57:20.
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Chickpea Production Guide
Corp, M.K., Machado, S., Ball, D.A., Smiley, R.W., Petrie, S.E., Siemens,
M.C., Guy, S.O. 2004. Chickpea production guide. Oregon State University
Extension Service Bulletins EM 8791-E. Corvallis, OR: Oregon State
University
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Residue Management Strategies for Direct Seeding
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. RESIDUE MANAGEMENT STRATEGIES
FOR DIRECT SEEDING. In PROCEEDINGS OF REDUCED TILLAGE LINKAGES DIRECT
SEEDING ADVANTAGE WORKSHOP, P. 18-26. NISKU, ALBERTA, 18-19 NOVEMBER.
EDMONTON, ALBERTA: REDUCED TILLAGE LINKAGES. 2003.
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Chopping Pays off in Heavy Stubble - Us Results
SIEMENS, M.C. CHOPPING PAYS OFF IN HEAVY STUBBLE - US RESULTS. AUSTRALIAN
FARM JOURNAL 13(10):50-51. MELBOURNE, VICTORIA, AUSTRALIA:AGRICULTURAL
PUBLISHERS PTY LTD. 2003.
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Development and Evaluation of a Residue Management Wheel for No-Till
Drills
Siemens, M.C., Wilkins, D.E., Correa, R.F. 2003. Development and
evaluation of a residue management wheel for no-till drills. ASAE paper
No. 03-1019, 10 pp. St. Joseph, Mich.:ASAE.
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Residue Wheel Improves Crop Establishment
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. 2003. RESIDUE WHEEL IMPROVES
CROP ESTABLISHMENT. AUSTRALIAN FARM JOURNAL 13(5):37-38. MELBOURNE,
VICTORIA, AUSTRAIA:AGRICULTURAL PUBLISHERS PTY LTD. . 2003.
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Residue Managers Improve Crop Establishment in Heavy Residues
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. RESIDUE MANAGERS IMPROVE CROP
ESTABLISHMENT IN HEAVY RESIDUES. South Australia No-Tillage Farmers
Association Newsletter 2(5)77-78. Claire, South Australia: SANTFA 2003.
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Machinery and Stubble Management
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. MACHINERY AND STUBBLE
MANAGEMENT. South Australia No-Tillage Farmers Association Newsletter
2(5)76. Clare, South Australia:SANTFA 2003.
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Machinery and Stubble Management
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. MACHINERY AND STUBBLE
MANAGEMENT. In Proceedings of the 11th Annual Western Australia No-Tillage
Farmers Association Conference. pp. 27-28. Perth Western Australia, 4-7
March 2003. Belmont, Western Australia:WANTFA.
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Residue Managers Improve Crop Establishment in Heavy Residues
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. RESIDUE MANAGERS IMPROVE CROP
ESTABLISHMENT IN HEAVY RESIDUES. In Proceedings of the 11th Annual Western
Australia No-Tillage Farmers Association Conference. pp. 9-12. Perth,
Western Australia, 4-7 March 2003. Belmont, Western Australia:WANTFA.
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Effects of the Residue Management Wheel and Other Residue Management
Strategies on Direct Seed Drill Performance
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F., WUEST, S.B. EFFECTS OF THE
RESIDUE MANAGEMENT WHEEL AND OTHER RESIDUE MANAGEMENT STRATEGIES ON DIRECT
SEED DRILL PERFORMANCE. IN PROCEEDINGS OF THE NORTHWEST DIRECT SEED
CROPPING SYSTEMS CONFERENCE AND TRADE SHOW. PP. 75-89. PASCO, WA, 8-10 JAN
2003.
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Changes in Soil Physical Characteristics During Transition from Intensive
Tillage to Direct Seeding - (18-Mar-02)
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Effects of Header Modifications on Garbanzo Bean Harvesting Losses
SIEMENS, M.C., CORP, M.K., CORREA, R.F. EFFECTS OF HEADER MODIFICATIONS ON
GARBANZO BEAN HARVESTING LOSSES. COLUMBIA BASIN AGRICULTURAL RESEARCH
ANNUAL REPORT. SR 1040. P. 37-43. CORVALLIS, OREG.: OREG. STATE UNIV. IN
COOPERATION WITH USDA-ARS, PENDLETON, OREG. 2002.
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Fertilizer Placement in Annual Crop Direct-Seeded Canola
WILKINS, D.E., WYSOCKI, D., SIEMENS, M.C., OTT, S., CORREA, R.F., JOHLKE,
T.R. FERTILIZER PLACEMENT IN ANNUAL CROP DIRECT-SEEDED CANOLA. COLUMBIA
BASIN AGRICULTURAL RESEARCH ANNUAL REPORT. P. 76-80. SR 1040. CORVALLIS,
OREG.: OREG. STATE UNIV. AGRIC. EXP. STATION IN COOPERATION WITH USDA-ARS,
PENDLETON, OREG. 2002.
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Evaluation of a Residue Management Wheel for Hoe-Type No-Till Drills
SIEMENS, M.C., WILKINS, D.E., CORREA, R.F. EVALUATION OF A RESIDUE
MANAGEMENT WHEEL FOR HOE-TYPE NO-TILL DRILLS. COLUMBIA BASIN AGRICULTURAL
RESEARCH ANNUAL REPORT. 2001.
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Effect of Fertilizer Placement and Soil Water on Emergence of Yellow
Mustard - (15-Mar-01)
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New Residue Manager Has Good Promise!
SIEMENS, M.C., CRABTREE, B. NEW RESIDUE MANAGER HAS GOOD PROMISE!.
Australia No-Tillage Farmers Association Newsletter 8(4):365. Belmont,
Western Australia: WANTFA. 2000.
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Effect of Tillage and Fallow on Soil Organic Carbon in the Columbia
Plateau
WILKINS, D.E., ALBRECHT, S.L., SIEMENS, M.C. EFFECT OF TILLAGE AND FALLOW
ON SOIL ORGANIC CARBON IN THE COLUMBIA PLATEAU. SOIL TILLAGE RESEARCH
ORGANIZATION INTERNATIONAL CONFERENCE PROCEEDINGS. JULY 2-7. FT. WORTH,
TX. (CD ROM - WILKINS#208-P16.PDF 9 PAGES). 2000.
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Managing and Distributing Residue for Conservation Tillage in the Pacific
Northwest
SIEMENS, M.C., WILKINS, D.E., WUEST, S.B. MANAGING AND DISTRIBUTING
RESIDUE FOR CONSERVATION TILLAGE IN THE PACIFIC NORTHWEST. ASAE ANNUAL
INTERNATIONAL MEETING. ASAE PAPER 001005, 14 PP. ST. JOSEPH, MICH.: ASAE.
2000.
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Managing and Distributing Residue for Direct Seed Systems
IN PROCEEDINGS OF THE NORTHWEST DIRECT SEED CROPPING SYSTEMS CONFERENCE
AND TRADE SHOW. PP101-109. PENDLETON, OR, 4-6 JAN 2000.
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