Title: Evaluating Mehlich III Extractant for Extracting Available Nutrients for Missouri Soils using Inductively Coupled Plasma Spectrometry.

Transcription

1 Title: Evaluating Mehlich III Extractant for Extracting Available Nutrients for Missouri Soils using Inductively Coupled Plasma Spectrometry. Investigators: Manjula Nathan, Department of Agronomy, University of Missouri Peter Scharf, Department of Agronomy Yichang Sun, MU Soil and Plant Diagnostic Service Laboratories David Dunn, Delta Regional Soil Testing Lab Objectives: 1. To determine the relationship between the Ammonium acetate and Mehlich III extractable K, Ca, Mg, Na for Missouri soils using Inductively Coupled Plasma (ICP) Spectrometry and Atomic Absorption (AA) Spectrometry. 2. To determine the relationship between the Bray I and Mehlich III extractable P using ICP and the colorimetric methods for Missouri soils. 3. To determine the relationship between the DTPA and Mehlich extractable Zn, Fe, Cu and Mn for Missouri soils using ICP and AA. 4. To relate the nutrient extracted by above methods with greenhouse yield response. Procedures: Soil samples received by the soil testing labs collected through out the state of Missouri will be used in this study. Samples collected from Sanborn field from the manured and non-manured plots as well from the farmer fields will also be analyzed. All nutrients will be analyzed both by the current MU soil test analytical procedures (colorimetry or AA) and by ICP. Soil samples will be analyzed for plant available K, Ca, Mg and Na by the Ammonium Acetate extraction (routine method used by MU Soil Testing Labs) and Mehlich III extractant using ICP and AA. These soil samples will also be analyzed for extractable P by Bray I extraction and Mehlich III extraction using ICP and colorimetric methods. Soil samples will be analyzed for plant available Zn, Fe, Cu and Mn by the DTPA extraction (routine method used by MU Soil Testing Labs) and Mehlich III extractant using ICP and AA. The relationship between the plant available nutrients estimated by Mehlich III extraction and the standard soil test procedures used by MU Soil Testing labs will be studied. The nutrient extracted by both procedures will be also related to the yield response using the yield data collected by Drs. John Lory s and Peter Scharf s (CO-PI) greenhouse study on Soil Specific Phosphorus and Potassium Recommendations Critical Values.

2 Page 2 Current Status and Importance of Research: Mehlich III is being increasingly used by soil testing labs for rapid nutrient analysis using ICP technology. The universal extractant Mehlich III, which extracts multiple elements simultaneously, has the potential to replace one or more of the standard extractants currently used by the MU labs. Research has shown significant correlation between Mehlich III extractable-p and Bray 1-P when determined colorimetrically. Mehlich III extractable-p when determined by ICP on Missouri soils was about 30 percent greater than by colorimetry (Nathan and Sun, 1997). Research was conducted at the University of Missouri, Iowa State University (Mallarino et al., 2003), University of Minnesota Soil Testing Laboratories and Colorado State University (Nathan et al, 2002) to verify the concept that ICP measures organic forms of P, which are not detected by colorimetric determination. This work summarized the comparison of Mehlich III extractable P by ICP and colorimetric determination on manured, non-manured soils, soils spiked with ATP, and poly molecular P. Mallarino (2003) from Iowa Ste University, has published their findings based on field calibration of the Mehlich-III soil P test with Colorimetry and ICP Emission Spectroscopy for Iowa soils. The preliminary studies were conducted by Nathan and Sun (1998) comparing Mehlich III extractable nutrients using ICP, AA and colorimetric methods with standard procedures currently used by the University of Missouri soil testing labs. Their studies revealed that the Mehlich III and Bray P I extracted identical quantities of P when measured by colorimetry. However, more P was measured by ICP on Mehlich III extracts than colorimetric measurement. The same was observed in manured and non-manured soils. Mehlich III extracted approximately the same amount of K as Ammonium acetate when measured by Atomic Absorption Spectroscopy, but less K was measured by ICP. Mehlich III extracted more Zn, Fe and Cu than DTPA. Although the ICP measured nutrient amounts varied relative to standard method, the correlation between the methodologies was great enough to suggest that the fertilizer recommendations could be adapted to Mehlich III extraction using simpler linear relationships for most measured nutrients. However, the major limitation in extrapolating these findings to use MU fertilizer recommendations calculations that are based on the standard methods to provide recommendations for Mehlich III extractable soil test nutrients is, the data was not correlated with any yield response. Timetable: April to June 2004 July to Sept 2004 Oct Dec 2004 Soil sample collection Soil sample analysis in soil testing laboratory. Sample collection and analysis of soil and plant tissue from the Soil Specific Phosphorus and Potassium Recommendations- Critical values greenhouse study conducted by Dr. Peter Scharf. Relate the soil test values from the Mehlich III extraction and the standard

3 Page 3 procedures used by MU soil testing lab to the yield response and plant tissue test data. Analyze research results. January, 2004 Feb June, 2004 Submit annual report for Fertilizer Lime Control. Summarize results, statistical analysis and write a manuscript article to be published. Strategy for Application/Transfer of Knowledge: The results from this project will be used to evaluate the use of Mehlich III extractant for determining the plant available nutrients for Missouri soils. When combined with additional field studies this data will be used to develop fertilizer recommendation based on the Mehlich III extractant. This will help in improving the use of MU soil test recommendations by producers using commercial soil testing labs that are using Mehlich III extractant. This will improve the quality of soil test based fertilizer recommendations used in Missouri. This information will be incorporated into University of Missouri recommended soil test procedures, research and extension publications and will be disseminated to the growers, researchers and industry personals by field day presentations, grower meetings, regional and national meetings. References: 1. Brown, J. R. and R. R. Rodriguez Soil Testing, A guide for conducting soil tests in Missouri. Missouri Cooperative Extension Service. 2. Eckert, D.J. and M.E. Watson. Integrating the Mehlich -3 extractant into existing soil test interpretation schemes. Commun. Soil Sci. Plant Anal., 27 (5-8), Mallarino, A.P Field Calibration for Corn of the Mehlich-3 Soil Phosphorus Test with Colorimetric and Inductively Coupled Plasma Emission Spectroscopy Determination Methods. Soil Sci. Soc. Am. J. 68: Mehlich, A Mehlich 3 soil test extractant: A modification of Mehlich 2 extractant. Commun. Soil Sci. Plant Anal.15: Nathan, M. V., Mallarino, A, Eliasan, R and R. Miller ICP vs. Colorimetric Determination of Mehlich III Extractable Phosphorus. International Symposium on Soil & Plant Analysis. Edmonton, Alberta, Canada. Commun. Soil Sci. Plant Anal. 33: Nathan, M. V., and Y. Sun Comparison of Mehlich III Extractable Nutrients using ICP, AA, and Colorimetry for Manured and Unmanured Soils. Annual Meetings Abstracts. ASA, CSSA, SSA, Madison, WI. P Nathan, M. V. and Y. Sun Comparison of Mehlich III Extractable Nutrients with Bray PI, Ammonium acetate Extractable Cations, and DTPA Extractable Nutrients in Missouri Soils. 1997

4 International Soil and Plant Analysis Symposium in The Promise of Precision Past, Present and Future. Minneapolis, MN, USA. Aug. 2-7, Page 4

5 Page 5 Budget CATEGORIES YEAR 2004 A. Salaries Senior Lab Technician (30%) $7,000 B. Fringe Benefits Fringe for Lab Technician (25%) $1,750 TOTAL SALARIES AND FRINGE BENEFITS $8,750 C. Travel Travel to field site $600 TOTAL TRAVEL COSTS $600 D. Equipment $0 TOTAL EQUIPMENT COSTS $0 E. Other Direct Costs Laboratory reagents and supplies Field supplies $3,500 $200 TOTAL OTHER DIRECT COSTS $3,700 TOTAL REQUEST $13,050 Justification: Salaries and Fringe Benefits: Funds are requested support of a senior lab technician for 4 months based on an annual salary of $23,350, 25% fringe benefits. Travel: Covers cost of travel to farm research centers and selected filed sites representing all soil regions in Missouri and for presentations. Laboratory Reagents and Supplies: Covers cost of laboratory reagents for ICP, AA, sample containers, and other materials used in soil and plant tissue analyses. Field: soil samplers, sample bags and other field supplies.

6 Page 6 MANJULA V. NATHAN Director of Soil and Plant Diagnostic Service Laboratory Tel.: (573) (work) (100% Extension) FAX: (573) Dept. of Agronomy nathanm@missouri.edu University of Missouri 23 Mumford Hall Columbia, MO Manjula V. Nathan Extension Asst. Professor, Dept. of Agronomy Director of MU Soil Testing and Plant Diagnostic Service Labs University of Missouri 23 Mumford Hall, Columbia, MO Phone: (573) FAX: (573) nathanm@missouri.edu Education Ph.D. in Agronomy (1989), South Dakota State University Major: Soil Fertility Minor: Chemistry M.Phil. in Agric. (1981), University of Peradeniya, Sri Lanka Major: Soil Chemistry Minor: Statistics B.S. (Hons.) in Agric. (1978), University of Peradeniya, Sri Lanka Major: Agronomy Specialization: Soil Science Employment History Lab Director/Extension Asst. Professor, MU to date Lab Manager/ Extension Associate, MU Associate Soil Scientist, NDSU Postdoctoral Associate, UMN Postdoctoral Research Fellow: MU Graduate Research Assistant, SDSU Soil Scientist, Dept. of Agric., Sri Lanka Research Scholar, British O.D.A. Project, Sri Lanka Asst. Lecturer, Univ. of Peradeniya, Sri Lanka Professional Service and Activities Chair and State representative for NCR -13 Committee on Soil and Plant Analysis Soil Testing and Plant Analysis Council (1994 to date) Board of Directors, Soil Testing and Plant Analysis Council ( ) Coordinator of Missouri Soil Testing Association Accreditation Program (1994 to date) North American Proficiency Testing Program QA/QC Committee (2000 to date) North American Proficiency Testing Oversight Committee of SSSA S 890 (2002 to date) Official Soil Testing Method Verification Committee of SSSA S 889 (1996 to date) Soil Testing and Plant Analysis Committee of SSSA -S 877 (2003 to date)

7 Page 7 Editorial Board for Communications in Soil Science and Plant Analysis Journal (2002 to date) National Science Foundation Graduate Fellowship Panelist ( ) External grant reviewer for US and Canadian Federal Funding Organizations (FIPSE, USDA and CAAS). Membership and Affiliations American Society of Agronomy Soil Science Society of America Soil Testing and Plant Analysis Council Sigma Delta Epsilon Gamma Sigma Delta AOAC International Honors and Awards Honored Member of Who Is Who in Agriculture Higher Education (WWAHE). 2001: Honored Member of the Lexington, KY "Who Is Who" chapter. 1989: First place in Graduate Student Poster Competition at the North Central Branch ASA Meetings, University of Missouri, Columbia, MO 1989: Plant Science Graduate Student Scholarship from South Dakota State University. 1988: Graduate Student Award from North Central Extension-Industry Soil Fertility Conference. 1987: Graduate Incentive Award from ALTRUSA International Foundation. 1981: Scholarship to attend training in "Cropping systems with special reference to soil fertility management" at ICRISAT, Hyderabad, India. 1979: Scholarship for M. Phil. degree from the Overseas Development Administration of the British Government. 1976: Agricultural and Cultural Seminar in Obihiro Chikusan University, Hokkaido, Japan representing the Faculty of Agriculture Student body, University of Peradeniya, Sri Lanka. Publications Refereed: 8 Abstracts: 17 Extension publications: 42 Proceedings and others: 37 Selected Refereed: 1. Mottavalli, P. P., J. Lory, M. Nathan and C. Fulcher Increased access to soil and plant testing database: Opportunities and Issues. Commun. In Soil Sci. and Plant Anal. 33: Combs, S. M. and M. V. Nathan Soil Organic Matter. In Recommended Chemical Soil Test Procedures for North Central Region. Ed. J. R. Brown. Chapter 12: Missouri Ag. Expt. Station SB 1001, Univ. of Missouri-Columbia. 3. Nathan, Manjula.V. and G.l. Malzer Dynamics of Ammonia Volatilization from Turkey Manure and Urea applied Soil. Soil Sci. Soc. Am. J. 58: Vivekanadan, M. and P.E. Fixen Cropping system effects on Mycorrhizal infection, early growth and phosphorus uptake of corn. Soil Sci.Soc. Am. J. 55: Vivekanandan, M, J. R. Brown, J. Williams, T. Clevenger, R. Belyea and M.E. Tumbleson Tolerance of forage legumes to lime stabilized sludge. Commun. Soil and Plant Anal. 22:

8 Page 8 Recent Abstracts 1. Nelson, K., Motavalli, P., and M. Nathan Response of no-till soybean to timing of pre-plant and foliar potassium applications in a clay pan soil. Annual Meetings Abstract. ASA, SSSA, CSSA. Madison, WI. 2. Nathan, M. V., Mallarino, A, Eliasan, R and R. Miller ICP vs. Colorimetric Determination of Mehlich III Extractable Phosphorus. International Symposium on Soil & Plant Analysis. Edmonton, Alberta, Canada. Commun. Soil Sci. Plant Anal. 33: Nathan, M. Starbuck, C. and Y. Sun Making recommendations Based on Laboratory Analysis of Compost: Science or Art? Annual Meetings Abstract. ASA, SSSA, CSSA. Madison, Wisconsin. 4. Motavalli, P. P., Lory, J. A., Nathan, M. V. and C.L. Fulcher Increased Access to Soil Testing Data Base Through the Worldwide Web: Opportunities and Issues. Annual Meetings Abstracts. ASA, CSSA, SSSA. Madison, WI. P Nathan, M. V., and Y. Sun Comparison of Mehlich III Extractable Nutrients using ICP, AA, and Colorimetry for Manured and Unmanured Soils. Annual Meetings Abstracts. ASA, CSSA, SSA, Madison, WI. P Nathan, M. V. and Y. Sun Comparison of Mehlich III Extractable Nutrients with Bray PI, Ammonium acetate Extractable Cations, and DTPA Extractable Nutrients in Missouri Soils International Soil and Plant Analysis Symposium in The Promise of Precision Past, Present and Future. Minneapolis, MN, USA. Aug. 2-7, Nathan, M. V. and S. A. Abernathy Reevaluation of Soil Organic Matter Determination by Loss-on-Ignition for Missouri Soils. P Annual Meetings Abstracts. ASA. CSSA. SSSA. Madison, WI. Most Recent Extension Publications 1. Scharf, P and M. Nathan Watch for unusual soil test potassium results this fall. Integrated Pest and Crop Management Newsletter. Vol. 13: No Nathan, M Soil Testing and Plant Diagnostic Services. Integrated Pest and Crop Management Newsletter. Vol. 13: No Nathan, M Soil Testing for Lawns and Gardens Missouri Environment and Garden. Vol. 9: No Nathan, M Soil Testing and Plant Diagnostic Services Missouri Environment and Garden. Vol. 9: No Nathan, Manjula Featured article on Soil Testing for Lawns & Gardens- Columbia Daily Tribune. 6. Nathan, Manjula Soil Testing for Better Lawns & Gardens. Missouri Environment and Garden. Volume 8: No 9.

9 Page 9 7. Nathan, Manjula Soil Testing for Lawns & Gardens- Spring is the Time to Test Your Soil. Missouri Environment and Garden. Volume 8: No Stevens, Gene., Motavali, Peter., Scharf, Peter., Nathan, Manjula., and David Dunn Crop Nutrient Deficiencies & Toxicities. IPM Publication, Plant Protection Programs, CAFNR, MU Extension Publication. IPM Nathan, M., J. Stecker, E. Ervin, L. Jett, M. Warmund and P. Scharf Commercial Fruits, Vegetables and Turf Soil Test Interpretations and Fertilizer Recommendation Guide. College of Agriculture, Food and Natural Resources, University of Missouri Miscellaneous Publication. MP 734. (In Review). 10. Lorenz, Todd and Manjula Nathan Soil Test Plant analysis Summary for Year Ag. connection. Vol. 7, No 5. April, Newsletter. 11. Nathan, Manjula Featured article on Soil Testing for Lawns & Gardens- Spring is the time to test your soils. Columbia Daily Tribune. 12. Nathan, Manjula Green Thumbs Up. Featured article on MU Soil Testing Lab, Mizzou Weekly. Faculty and Staff News Paper. University of Missouri- Columbia. 13. Stecker, J. A., Nathan, M. V. and Y. Sun Soil Testing Guide. (Available as electronic version). 14. Nathan, Manjula Spring is the time to test your soils. Columbia Daily Tribune, April 25, Nathan, M. V. and B. Freesenberg Soil Testing for Lawns. MU Guide G6954. University of Missouri Extension Publications. 16. Nathan, M. V Training the Trainers - Master Gardner Training. Soils, Plant Nutrition and Soil Testing and Plant Analysis Program Implementation Planning. University Extension. Holiday Inn Select, Columbia, MO. January CD Rom. Most Recent Proceedings, Presentations, and Others 1. Nathan, M Soils, Plant Nutrition, and Soil Testing. Train the Trainers Master Garner PDE. Oct 16, Nelson, K, Motavalli, P and M. Nathan, The Impact of Potassium Fertilizer Source on Crop Response and Weed Control in a No-till Weed and Feed Glyphosate- Resistant Soybean Production System. Novelty Field Day Presentation. Aug Nathan, M MU Soil Testing and Plant Diagnostic Service Laboratories. MU Turf grass Field Day. July 8, Nathan, Manjula Reagents and Standards. Chapter 5. In. Quality Assurance and Quality Control Procedure Manual for Soil Testing Labs. Ed. Maurice Watson. North American Proficiency Program Publication. In review.

10 Page Nathan, Manjula Soil Testing and Plant Analysis for Grape Vine Establishment and Production. Grape Vine Establishment Workshop, Fruit Science Dept. South West Missouri State University, Mountain Grove, MO. Dec 13, Nathan, M Test Your Soils for Better Lawns and Gardens. Poster presentation. University Outreach and Extension. 7. Nathan, Manjula Soil Testing Fundamentals. CCA Training for NRCS Employees, NRCS, Columbia, MO Nov Motavalli, P, Nelson, K and M. Nathan Soybean response to pre-plant and foliar application of K. Crop Management conference. Dec 18-19, Holiday Inn Executive Center, Columbia, MO. 9. Scharf, P., and Manjula Nathan Soil Sampling, Use of Nitrate N Test for Corn and Tissue Testing. Crop Injury Diagnostic Clinic. Bradford Farm, Univ. of Missouri. July Nathan, Manjula Soil Testing Fundamentals. CCA Training for DNR and Soil Conservation Service Employees, Ramada Inn, Columbia, MO. February 14, Nathan, Manjula Use of Plant Analysis in Blueberry Production. Missouri Small Fruit Conference, SWMS State University, Spring Field, Missouri. February 20, Peter Clifton Scharf Education Degree Date Institution Major Ph.D. May 1993 Virginia Polytechnic Inst. Crop & Soil and State University Environmental Sciences M.S. July 1988 Virginia Polytechnic Inst. Agronomy and State University B.S. August 1982 University of Wisconsin Biochemistry, Genetics Professional Experience 2002 to present Associate Professor in the Agronomy Department of the University of Missouri. Responsible for applied research and extension in the area of nutrient management to 2002 Assistant Professor in the Agronomy Department of the University of Missouri. Areas of Interest field-specific, soil-specific, and variable-rate fertilizer recommendations minimizing environmental impacts of agricultural practices optimizing crop management Skills

11 Page 11 ability to communicate effectively, to cooperate with others, and to manage projects and people outstanding laboratory, field, project design, and data analysis skills excellent natural science background Sample Research Publications Scharf, Peter C. and William J. Wiebold Soybean yield responds minimally to nitrogen applications in Missouri. Online. Crop Management doi: /cm rs. Scharf, Peter C., John P. Schmidt, Newell R. Kitchen, Kenneth A. Sudduth, S. Young Hong, John A. Lory, and J. Glenn Davis Remote sensing for N management. J. Soil Water Cons. 57: Scharf, Peter C., William J. Wiebold, and John A. Lory Corn yield response to nitrogen fertilizer timing and deficiency level. Agron. J. 94: Scharf, Peter C Soil and plant tests to predict optimum N rates for corn. J. Plant Nutr. 24: Sample Extension Publications Scharf, Peter Nitrogen prices are up again: How should that affect management decisions? Integrated Pest and Crop Management 13: Scharf, Peter, Kevin Bradley, Shawn Conley, and Bill Wiebold Risk of atrazine carryover damage to wheat and soybean. Integrated Pest and Crop Management 13:140. Scharf, Peter and John Lory Calibrating corn color from aerial photographs to predict sidedress nitrogen need. Crop Decisions Jan/Feb 2003 p Peter Clifton Scharf Education Degree Date Institution Major Ph.D. May 1993 Virginia Polytechnic Inst. Crop & Soil and State University Environmental Sciences M.S. July 1988 Virginia Polytechnic Inst. Agronomy and State University B.S. August 1982 University of Wisconsin Biochemistry, Genetics Professional Experience 2002 to present Associate Professor in the Agronomy Department of the University of Missouri. Responsible for applied research and extension in the area of nutrient management to 2002 Assistant Professor in the Agronomy Department of the University of Missouri. Areas of Interest field-specific, soil-specific, and variable-rate fertilizer recommendations minimizing environmental impacts of agricultural practices

12 Page 12 optimizing crop management Skills ability to communicate effectively, to cooperate with others, and to manage projects and people outstanding laboratory, field, project design, and data analysis skills excellent natural science background Sample Research Publications Scharf, Peter C. and William J. Wiebold Soybean yield responds minimally to nitrogen applications in Missouri. Online. Crop Management doi: /cm rs. Scharf, Peter C., John P. Schmidt, Newell R. Kitchen, Kenneth A. Sudduth, S. Young Hong, John A. Lory, and J. Glenn Davis Remote sensing for N management. J. Soil Water Cons. 57: Scharf, Peter C., William J. Wiebold, and John A. Lory Corn yield response to nitrogen fertilizer timing and deficiency level. Agron. J. 94: Scharf, Peter C Soil and plant tests to predict optimum N rates for corn. J. Plant Nutr. 24: Sample Extension Publications Scharf, Peter Nitrogen prices are up again: How should that affect management decisions? Integrated Pest and Crop Management 13: Scharf, Peter, Kevin Bradley, Shawn Conley, and Bill Wiebold Risk of atrazine carryover damage to wheat and soybean. Integrated Pest and Crop Management 13:140. Scharf, Peter and John Lory Calibrating corn color from aerial photographs to predict sidedress nitrogen need. Crop Decisions Jan/Feb 2003 p Yichang Sun Senior Research Lab Technician, Dept. of Agronomy MU Soil Testing and Plant Diagnostic Service Labs University of Missouri 22 Mumford Hall, Columbia, MO Phone: (573) FAX: (573) sunyi@missouri.edu Education Ph.D. in Soil Science (1995), University of Missouri-Columbia Major: Plant Nutrition and Soil Fertility M. S. in Agronomy (1990), Kansas State University Major: Soil Fertility and Plant Nutrition B.S. in Agronomy (1982), Jilin Agricultural University, P.R. China Major: Agrichemistry Specialization: Soil Science

13 Page 13 Employment History Senior Research Lab Technician, UMC to date Graduate Research Assistant, UMC Graduate Research Assistant, KSU Visiting Scholar, KSU Teaching Instructor, JAU Membership and Affiliations American Society of Agronomy Soil Science Society of America Gamma Sigma Delta Honors and Awards 1992: Received C. E. Marshall Award. 1986: Research Award from the scientific and Technological Commission of Jilin. 1986: Research Award from the Department of Commerce of the People s Republic of China. Publications Refereed 1. Yichang S., J. L. Havlin, and G. M. Paulsen Evaluation of nutrient deficiencies in wheat seedlings by chlorophyll fluorescence. Journal of Plant Nutrition, 12(6): Zucheng Z. and Yichang S Application storage of chemical fertilizers. Jilin Academic Press, Changchun, 170p. 3. Zucheng Z., Zhenyu J., Hongyu W., and Yichang S Fates of solid nitrogen fertilizers in dryland soils. Environmental Science. 6: Hongyu W., Zucheng Z., Zhenyu J., and Yichang S Relationship between mineral N and alkali-hydrolysable N in dryland soils in Jilin. Compilations of data of soil survey in Jilin. 2: Zhenyu J., Zucheng Z., Hongyu W., and Yichang S Loss pathways and Preventive measures of solid nitrogen fertilizers applied to dryland soils. Compilations of data of soil survey in Jilin. 2: Zucheng Z., Hongyu W., Zhenyu J., and Yichang S Main parameters in the formula of applying N fertilizers for maize based on soil test. Journal of Jilin Agricultural University. 4: Abstracts

14 Page Nathan, M. Starbuck, C. and Y. Sun Making recommendations Based on Laboratory Analysis of Compost: Science or Art? Annual Meetings Abstract. ASA, SSSA, CSSA. Madison, Wisconsin. 2. Nathan, M. V., and Y. Sun Comparison of Mehlich III Extractable Nutrients using ICP, AA, and Colorimetry for Manured and Unmanured Soils. Annual Meetings Abstracts. ASA, CSSA, SSA, Madison, WI. P Nathan, M. V. and Y. Sun Comparison of Mehlich III Extractable Nutrients with Bray PI, Ammonium acetate Extractable Cations, and DTPA Extractable Nutrients in Missouri Soils International Soil and Plant Analysis Symposium in The Promise of Precision Past, Present and Future. Minneapolis, MN, USA. Aug. 2-7, CURRICULUM VITAE DAVID J. (Dave) DUNN University of Missouri Delta Center, P. O. Box 160 Portageville, MO Phone (573) EDUCATION: Degree: M.S. Geology (with emphasis in soils development) 1985 Institution: Iowa State University Professor: Dr. Carl F. Vondra Degree: B.S. Geology, 1980 Institution: Iowa State University PROFESSIONAL EXPERIENCE: Supervisor: Soil Testing Lab 1997-present University of Missouri-Delta Center, Portageville, Missouri Lab Tech II, Soil Testing Lab Iowa State University, Ames, Iowa Lab Tech II, Power Plant Iowa State University, Ames, Iowa PROFESSIONAL SERVICE: present University of Missouri Soil Testing Lab Advisory Committee present University of Missouri Soil Test Recommendations Review Committee present University of Missouri Soil Fertility Working Group.

15 Page Editor of Missouri Rice Research Update. PROFESSIONAL SOCIETY MEMBERSHIPS: American Society of Agronomy Soil Science Society of America Rice Technical Work Group RECENT PUBLICATIONS: Refereed Publications: Stevens, W.E., S.A. Berberich, P.A. Sheckell, C.C. Wiltse, M.E. Halsey, M.J. Horak, and D.J. Dunn Optimizing pollen confinement in corn grown for regulated products. Crop Science. In review. Stevens, G. and D. Dunn Fly ash as a liming material. J. Environmental Quality 33: XX (Jan-Feb issue). D. Dunn, G. Stevens, M. Aide, and J. Horn Effect of soil ph and zinc on rice cultivars in Missouri. Trans. Missouri Acad. of Sci. pg Stevens, G., A. Wrather, H. Wilson, and D. Dunn Soil sampling fields with four types of soil probes. Online. Crop Management. doi: /cm rs. Stevens, G., D. Dunn, and B. Phipps How to diagnose soil acidity and alkalinity problems in crops: a comparison of soil ph test kits. [Online] J. of Extension. 39:4, Available at (Verified 23 Oct. 2001). Dunn, D., B. Phipps, G. Stevens, and A. Phillips Effect of CaSO 4 (gypsum) on cotton lint yields, soil fertility, and physical properties of heavy clay soils in Missouri. Proc. Missouri Acad. of Sci. 35:1-5. Agricultural Bulletins: Stevens, G., P. Motavalli, P. Scharf, M. Nathan, and D. Dunn Crop nutrient deficiencies and toxicities, Integrated Pest Management Plant Protection Program, IMP1008. Crop Management Computer Programs: Stevens, G., R. Massey, and D. Dunn NITROMAX- program for maximizing economic returns on nitrogen fertilizer. University of Missouri Commercial Agric. Program and Ext./Outreach. Avail. at (Verified 18 Jul. 2002). Stevens, G., D. Reinbott, R. Massey, and D. Dunn PROFITMETER-interactive program for calculating cropping system costs. University of Missouri Commercial Agric. Program and Ext./Outreach. Avail. on diskettes.

16 Page 16 Invited Workshops: Stevens, G. and D. Dunn The basis for and verification of Missouri soil test recommendations. Soil management workshop. Beltwide Cotton Conf., San Antonio, TX, Jan Submitted Abstracts and Proceedings: Stevens, G., and D. Dunn Soil fertility research at the University of Missouri-Delta Center. Southern Soil Fertility Conf. Memphis, Tennessee, October 8-9. In Press. Stevens, G, J. Lory, and D. Dunn Chicken manure on freshly graded rice fields Feb th Rice Technical Workers Group Meeting. Little Rock, AR. Dunn, D. and G. Stevens Rice response to boron soil applied boron and seed treatment boron Feb th Rice Technical Workers Group Meeting. Little Rock, AR. Stevens, G., D. Reinbott, and D. Dunn Maximizing profits with nitrogen response curves: an internet-ready computer program. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Atlanta, GA. Jan Phipps, B., G. Stevens, D. Dunn, and A. Phillips Response of modern cotton varieties to mid-season potassium fertilization. Proc. Soil Mgmt. and Plt. Nut., Beltwide Conf., Atlanta, GA. Jan Thomas, J., M. Kenty, J. Banks, S. Osborne, T. Blythe, N. Buehring, M. Harrison, J. Camberato, D. Dunn, W. Stevens, K. Edminstein, C. Green, S. Hague, S. Stewart, G. Harris, M. Holman, D. Howard, B. Lewis, J. Matacha, J. McConnell, and M. Zerkoune Evaluation of two foliar N sources for cotton fertilization. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Atlanta, GA. Jan Kenty, M., J. Thomas, N. Buehring, R. Dobbs, M. Harrison, D. Dunn, W. Stevens, C. Green, J. McConnell, and D. Howard Comparison of two methods for determining petiole N and K levels. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Atlanta, GA. Jan Dunn, D., G. Stevens, P. Motavalli, and T. Gladbach Calcium/magnesium ratios and red or white lime for cotton production. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Atlanta, GA. Jan Stevens, W.E., and D. Dunn Calculating maximum economic returns on nitrogen fertilization on corn, cotton, and rice. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct no. c00-dunn d. Birmingham, K., W.E. Stevens, D. Dunn, and P. Motavalli Effect of mechanical soil compaction on soybean growth and grain yields. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct , no. s06-dunn p. Sheckell, P., W.E. Stevens, D. Dunn, and J. Lory Using chicken litter to increase productivity of freshly graded ground. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct , no. s04-dunn p.

17 Page 17 Wilson, H., W.E. Stevens, and D. Dunn Timing of flood termination for waterseeded rice. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct no. s06-dunn p. Dunn, D., and W.E. Stevens Rice yields response to mid-season potassium fertilization. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct , no. s04-dunn Moylan, C., W.E. Stevens, D. Dunn, J. Williams, and N. Kitchen Using a chlorophyll meter to predict yield response to in-season nitrogen fertilization of corn. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct , no. s04-dunn d. Motavalli, P., S. Anderson, R. Kremer, W. Stevens, and D. Dunn Effects of surface and subsoil compaction on nitrogen availability and carbon transformations. Amer. Soc. of Agronomy Meetings Abstracts, Charlotte, NC Oct , no. s04-motavalli o. Stevens, G., and D. Dunn Soil fertility research at the University of Missouri-Delta Center. Southern Soil Fertility Conf. Memphis, Tennessee, October Davis, G., Dunn, D. and G. Stevens Site-specific nitrogen management for cotton. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Anaheim, CA Jan p Dunn, D., G. Stevens, and M. Milam Portable ph meter for in-field soil testing. Proc. Soil Mgmt. and Plt. Nut. Conf., Beltwide Conf., Anaheim, CA Jan p Gladbach, T., G. Stevens, D. Dunn, and P. Motavalli Effect of soil calcium:magnesium ratios on potassium uptake and cotton yields. Proc. Soil Mgmt. and Plt. Nut. Conf., Proc. Beltwide Conf., San Antonio, TX, Jan p