Projects

REDUCING NITRATE LOSSES FROM AGRICULTURAL FIELDS WITH SUBSURFACE DRAINAGE Appropriated (D)   Accession Number: 411511

ECOLOGICALLY-BASED SOIL MANAGEMENT FOR SUSTAINABLE AGRICULTURE AND RESOURCE CONSERVATION Appropriated (D)   Accession Number: 409570

BIOGEOCHEMICAL PROCESSES INFLUENCING FORMATION AND STABILIZATION OF SOIL ORGANIC MATTER AND SOIL STRUCTURE Appropriated (D)   Accession Number: 410769

SOIL ORGANIC MATTER AND NITROGEN CYCLING UNDER CONTINUOUS RICE CROPPING IN THE MEKONG DELTA, VIETNAM Nonfunded Cooperative Agreement (N)   Accession Number: 409686

AN ANALYSIS OF AGROFORESTRY'S PHYSICAL, BIOLOGICAL, ECOLOGICAL, ECONOMIC AND SOCIAL BENEFITS Specific Cooperative Agreement (S)   Accession Number: 409449

EVALUATION OF CROP YIELD VARIABILITY ACROSS CROP PRODUCTION FIELDS IN CENTRAL IOWA Specific Cooperative Agreement (S)   Accession Number: 414249

Publications

Influence of animal manure application on the chemical structures of soil organic matter as investigated by advanced solid-state NMR and FT-IR spectroscopy - (Peer Reviewed Journal)

Mao, J., Olk, D.C., Fang, X., He, Z., Schmidt-Rohr, K. 2008. Influence of animal manure application on the chemical structures of soil organic matter as investigated by advanced solid-state NMR and FT-IR spectroscopy. Geoderma. 146(1-2)353-362.

Using anion chromatography-pulsed amperometry to meaasure amino compounds in dairy manure-amended soils - (Peer Reviewed Journal) - (19-May-08)

Capillary Electrophoresis and Fluorescence Excitation-Emission Matrix Characterization of Soil Mobile and Calcium Humates - (Proceedings/Symposium)

He, Z., Ohno, T., Olk, D.C., Wu, F., Honeycutt, C.W., Mao, J. 2008. Capillary Electrophoresis and Fluorescence Excitation-Emission Matrix Characterization of Soil Mobile and Calcium Humates. International Humic Substances Society Conference. From molecular understanding to innovative applications of humic substances, Vol. I. Humus Sapiens, Moscow, Russia.

Improved analyses for soil carbohydrates, amino acids, and phenols: Tools for understanding soil processes - (Peer Reviewed Journal) - (08-Apr-08)

Lability of Humic-Bound Phosphorus - (Abstract)

He, Z., Honeycutt, C.W., Olk, D.C. 2008. Lability of Humic-Bound Phosphorus. Humic Science and Technology Conference Abstract. p. 52.

Phenol accumulation in a young humic fraction following anaerobic decomposition of rice crop residues - (Peer Reviewed Journal) - (25-Mar-08)

Capillary Electrophoresis and Fluorescence Excitation-Emission Matrix Spectroscopy for Characterization of Humic Substances - (Peer Reviewed Journal)

He, Z., Ohno, T., Wu, F., Olk, D.C., Honeycutt, C.W., Olanya, O.M. 2008. Capillary Electrophoresis and Fluorescence Excitation-Emission Matrix Spectroscopy for Characterization of Humic Substances. Soil Science Society of America Journal. 72:1248-1255.

Some Contributions of Resistant Compounds to Soil Organic Matter Formation and Nutrient Cycling - (Abstract)

Olk, D.C., Laird, D.A., Thompson, M.L. 2007. Some Contributions of Resistant Compounds to Soil Organic Matter Formation and Nutrient Cycling [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts. Nov. 4-8, 2007, New Orleans, LA.

Advanced Solid-State 13C NMR Analysis of Organic Matter in a Nebraska Corn Soil Amended with Cattle Manure - (Abstract)

Mao, J., Olk, D.C., Gleason, J. 2007. Advanced Solid-State 13C NMR Analysis of Organic Matter in a Nebraska Corn Soil Amended with Cattle Manure [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Aerobic decomposition of crop residues improves N availability and grain yield for three rice soils of the Mekong Delta, Vietnam: A screenhouse study - (Abstract)

Trang, T.T., Guong, V.T., Olk, D.C., Vien, D.M., Dong, N.M., Merckx, R. 2007. Aerobic decomposition of crop residues improves N availability and grain yield for three rice soils of the Mekong Delta, Vietnam: A screenhouse study [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 4-8, 2007, New Orleans, LA.

Chemical Structures of Feces from Conventional and Phytase Transgenic Pigs Investigated by Advanced Solid-State NMR Spectroscopy - (Peer Reviewed Journal)

Mao, J.D., Zhang, T., Lan, Y., Olk, D.C., Ding, G., Ceballos, M. 2008. Chemical Structures of Feces from Conventional and Phytase Transgenic Pigs Investigated by Advanced Solid-State NMR Spectroscopy. Journal of Agricultural and Food Chemistry. 56(6):2131-2138.

Analysis of Phosphorus in Soil Humic Acid Fractions by Enzymatic Hydrolysis and Ultraviolet Irradiation - (Abstract)

He, Z., Olk, D.C., Honeycutt, C.W., Fortuna, A., Ohno, T. 2007. Analysis of Phosphorus in Soil Humic Acid Fractions by Enzymatic Hydrolysis and Ultraviolet Irradiation. Soil Science Society of America Annual Meeting. CD-ROM

Characterization of IHSS Natural Organic Matter by Capillary Electrophoresis and Flourescence Spectroscopy - (Abstract)

He, Z., Ohno, T., Wu, F., Olk, D.C., Honeycutt, C.W., Olanya, O.M. 2007. Characterization of IHSS Natural Organic Matter by Capillary Electrophoresis and Flourescence Spectroscopy. American Chemical Society Abstracts. 10th Anniversary Humic Science and Technology Conference Abstracts; page 27

Analyses developed by Dean Martens for soil carbohydrates, phenols, and amino compounds: Tools for understanding soil processes - (Abstract)

Olk, D.C. 2006. Analyses developed by Dean Martens for soil carbohydrates, phenols, and amino compounds: Tools for understanding soil processes [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 12-16, Indianapolis, IN.

Using anion chromatography-pulsed amperometry to measure amino compounds in animal manure-amended soil - (Abstract)

Olk, D.C., Fortuna, A., Honeycutt, C.W. 2006. Using anion chromatography-pulsed amperometry to measure amino compounds in animal manure-amended soil [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 12-16, 2006, Indianapolis, IN.

Response to "Comments on 'Need for a Soil-based Approach in managing Nitrogen Fertilizers for Profitable Corn Production' and 'Soil Organic Nitrogen Enrichment Following Soybean in an Iowa Corn-Soybean Rotation'" - (Other)

Jaynes, D.B., Olk, D.C., Colvin, T., Kaspar, T.C., Karlen, D.L. 2007. Response to "Comments on 'Need for a Soil-based Approach in managing Nitrogen Fertilizers for Profitable Corn Production' and 'Soil Organic Nitrogen Enrichment Following Soybean in an Iowa Corn-Soybean Rotation'". Soil Science Society of America Journal. 71(1):255.

INHIBITION OF NITROGEN MINERALIZATION IN YOUNG HUMIC FRACTIONS BY ANAEROBIC DECOMPOSITION OF RICE CROP RESIDUES - (Peer Reviewed Journal)

Olk, D.C., Samson, M.I., Gapas, P. 2007. Inhibition of nitrogen mineralization in young humic fractions by anaerobic decomposition of rice crop residues. European Journal of Soil Science. 58:270-281.

SOME BIOLOGICAL, CHEMICAL, AND PHYSICAL FRACTIONATION PROCEDURES FOR SOIL ORGANIC MATTER - (Abstract)

Olk, D.C., Gregorich, E.G., Farenhorst, A., Hayes, M., Paul, E.A., Simpson, M.J. 2006. Some biological, chemical, and physical fractionation procedures for soil organic matter. In: Proceedings of the 13th Meeting of the International Humic Substances Society. 45(1):21-24.

ORGANIC FORMS OF NITROGEN - (Book/Chapter)

Olk, D.C. 2007. Organic Forms of Nitrogen. In: Carter, M.R., Gregorich, E.G., editors. Soil Sampling and Methods of Analysis. 2nd Edition. Boca Raton, FL: Taylor & Francis Group, CRC Press. p. 667-674.

A CHEMICAL FRACTIONATION FOR STRUCTURE-FUNCTION RELATIONS OF SOIL ORGANIC MATTER IN NUTRIENT CYCLING - (Peer Reviewed Journal)

Olk, D.C. 2006. A chemical fractionation for structure-function relations of soil organic matter in nutrient cycling. Soil Science Society of America Journal. 70(3) 1013-1022.

SIX DECADES OF SOIL ORGANIC MATTER STUDY: THE HISTORY OF NCERA-59 - (Abstract)

Allan, D., Archibald, D., Cihacek, L., Dick, R., Drijber, R., Frey, S., Horwath, W., Motavalli, P., Olk, D.C., Rice, C., Snapp, S., Stone, A., Turco, R., Wander, M., Weil, R. 2006. Six decades of soil organic matter study: the history of NCERA-59. In: Proceedings of the World Congress of Soil Science, July 9-15, 2006, Philadelphia, PA. 2006 CD-ROM.

CHEMICAL STABILIZATION OF SOIL NITROGEN BY PHENOLIC LIGNIN RESIDUES IN ANAEROBIC AGRO-ECOSYSTEMS - (Abstract)

Olk, D.C. 2005. Chemical stabilization of soil nitrogen by phenolic lignin residues in anaerobic agro-ecosystems. 6th Meeting of the Brazilian Substances Society [abstract]. p. P 36-38.

INHIBITED UPTAKE OF SOIL N AND ITS YIELD IMPACT FOR CONTINUOUS RICE CROPPING IN ARKANSAS - (Abstract)

Olk, D.C., Anders, M.M. 2005. Inhibited uptake of soil N and its yield impact for continuous rice cropping in Arkansas [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

TREE SPECIES DIFFER IN THEIR LONG-TERM EFFECTS ON SOIL CARBON DYNAMICS AND BIOCHEMISTRY IN LOWLAND COSTA RICA - (Abstract)

Russell, A., Olk, D.C., Marek, R., Fisher, R., Raich, J. 2005. Tree species differ in their long-term effects on soil carbon dynamics and biochemistry in lowland Costa Rica [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

SHORT-AND LONG-TERM EFFECTS OF ROTATION AND TILLAGE ON SOIL AGGREGATE STABILITY AND RESISTANCE - (Abstract)

Anders, A.A., Schmid, B., Olk, D.C. 2005. Short-and long-term effects of rotation and tillage on soil aggregate stability and resistance [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

COMPARISON OF CUO OXIDATION AND TMAH FOR MEASURING PHENOLS IN HUMIC SAMPLES - (Abstract)

Filley, T.R., Gamblin, D., Olk, D.C. 2005. Comparison of CUO oxidation and TMAH for measuring phenols in humic samples [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

LONG-TERM CHANGES IN SOIL NITROGEN SUPPLYING CAPACITY IN RICE-MAIZE AND RICE-RICE CROPPING SYSTEMS - (Abstract)

Buresh, R.J., Lazaro, W.M., Pampolino, M.F., Dizon, M.A., Olk, D.C., Witt, C. 2005. Long-term changes in soil nitrogen supplying capacity in rice-maize and rice-rice cropping systems [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Nov. 6-10, 2005, Salt Lake City, UT.

OVERVIEW OF THE SYMPOSIUM PROCEEDINGS, "MEANINGFUL POOLS IN DETERMINING SOIL C AND N DYNAMICS" - (Peer Reviewed Journal)

Olk, D.C., Gregorich, E.G. 2006. Overview of the symposium proceedings, "Meaningful pools in determining soil C and N dynamics". Soil Science Society of America Journal. 70(3): 967-974.

CHEMICAL STABILIZATION OF SOIL ORGANIC NITROGEN BY PHENOLIC LIGNIN RESIDUES IN ANAEROBIC AGROSYSTEMS - (Peer Reviewed Journal)

Olk, D.C., Cassman, K.G., Schmidt-Rohr, K., Anders, M.M., Mao, J.D., Deenik, J.L. 2006. Chemical stabilization of soil organic nitrogen by phenolic lignin residues in anaerobic agrosystems. Soil Biology and Biochemistry. 38(11):3303-3312.

SHORT AND LONG TERM EFFECTS OF CONSERVATION TILLAGE ON SOIL RESISTANCE AND AGGREGATE STABILITY IN RICE PRODUCTION SYSTEMS. - (Proceedings/Symposium)

Anders, M.M., Schmid, B., Olk, D.C. 2005. Short and long term effects of conservation tillage on soil resistance and aggregate stability in rice production systems. Proceedings of the 27th Annual Southern Conservation Tillage Systems Conference. p. 102-110.

TREE SPECIES OF MOIST TROPICAL FORESTS DIFFER IN THEIR DETRITAL BIOCHEMISTRY AND EFFECTS ON SOIL CARBON DYNAMICS - (Abstract)

Russell, A.E., Olk, D.C., Marek, R.F. 2005. Tree species of moist tropical forests differ in their detrital biochemistry and effects on soil carbon dynamics. In: Ecological Society of America Proceedings. Ecological Society of America 90th Annual Meeting, Aug. 7-12, 2005, Montreal, Canada. p. 554.

Integrated Nutrient Management: Experience from rice-based systems in Southeast Asia - (Book/Chapter)

Olk, D.C., Becker, M., Linquist, B.A., Pandey, S., Witt, C. 2008. Integrated Nutrient Management: Experience from rice-based systems in Southeast Asia. In: Aulakh, M.S. and Grant, C.A., editors. Integrated Nutrient Management for Sustainable Crop Production. Haworth Press/Taylor & Francis. New York, NY. p. 369-420.

DOES ANAEROBIC DECOMPOSITION OF CROP RESIDUES IMPAIR SOIL NITROGEN CYCLING AND YIELD TRENDS IN LOWLAND RICE? - (Proceedings/Symposium)

Olk, D.C., Cassman, K.G., Anders, M.M., Schmidt-Rohr, K., Mao, J.D. 2005. Does anaerobic decomposition of crop residues impair soil nitrogen cycling and yield trends in lowland rice? [CD-ROM] Proceedings of the World Rice Research Conference, Nov. 4-7, 2004, Tokyo and Tsukuba, Japan. p. 374-377.

CHEMICAL STABILIZATION OF SOIL ORGANIC NITROGEN BY PHENOLIC LIGNIN COMPOUNDS IN ANAEROBIC AGROSYSTEMS - (Abstract)

Olk, D.C. 2004. Chemical stabilization of soil organic nitrogen by phenolic lignin compounds in anaerobic agrosystems [CD-ROM]. American Geophysical Union. Paper No. 5896. Washington, D.C.

TRIGGERING OF METHANE PRODUCTION IN RICE SOILS BY ROOT EXUDATES: EFFECTS OF SOIL PROPERTIES AND CROP MANAGEMENT - (Peer Reviewed Journal)

Mitra, S., Aulakh, M.S., Wassmann, R., Olk, D.C. 2005. Triggering of Methane Production in Rice Soils by Root Exudates: Effects of Soil Properties and Crop Management. Soil Science Society of America Journal. 69:556-570.

A CHEMICAL FRACTIONATION FOR STRUCTURE-FUNCTION RELATIONS OF SOIL ORGANIC MATTER IN NUTRIENT CYCLING - (Abstract)

Olk, D.C. 2004. A chemical fractionation for structure-function relations of soil organic matter in nutrient cycling [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, WI.

EFFECT OF ROTATION, TILLAGE, AND FERTILITY ON RICE YIELD AND NUTRIENT CYCLING - (Abstract)

Anders, M.M., Olk, D.C., Holzhauer, J. 2004. Effect of rotation, tillage, and fertility on rice yield and nutrient cycling [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, WI.

LONG-TERM MANAGEMENT EFFECTS ON THE MOBILE HUMIC ACID FRACTION - (Abstract)

Legorreta, F., Walters, D.T., Olk, D.C., Madhavan, S., Cassman, K.G. 2004. Long-term management effects on the mobile humic acid fraction [CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. Madison, WI.

THE EFFECT OF ROTATION, TILLAGE, AND FERTILITY ON RICE GRAIN YIELDS AND NUTRIENT FLOWS - (Proceedings/Symposium)

Anders, M.M., Olk, D.C., Harper, T., Daniel, T., Holzhauer, J. 2004. The effect of rotation, tillage, and fertility on rice grain yields and nutrient flows [CD-ROM]. TB-321. Raleigh, NC. North Carolina Agricultural Research Service Technical Bulletin.

DOES ANAEROBIC DECOMPOSITION OF CROP RESIDUES ALTER SOIL ORGANIC MATTER QUALITY AND NUTRIENT CYCLING? - (Abstract)

Olk, D.C. 2004. In: L. Martin-Meto, D. Milori, and W. da Silva. Humic Substances and Soil Water Environment EMBRAPA Instrumentacao Agropecuaria. Does Anaerobic Decomposition of Crop Residues Alter Soil Organic Matter Quality and Nutrient Cycling? International Humic Substances Society Conference. p. 615-617.

NITROGEN-BONDED AROMATICS IN SOIL ORGANIC MATTER AND THEIR IMPLICATIONS FOR A YIELD DECLINE IN INTENSIVE RICE CROPPING - (Peer Reviewed Journal)

Schmidt-Rohr, K., Mao, J.D., Olk, D.C. 2004. Nitrogen-bonded aromatics in soil organic matter and their implications for a yield decline in intensive rice cropping. Proceedings Of The National Academy Of Sciences. 101(17):6351-6354.

IMPAIRED CYCLING OF SOIL NITROGEN UNDER CONTINUOUS RICE ROTATIONS IN THE ARKANSAS GRAND PRAIRIE AREA - (Abstract)

Olk, D.C., Anders, M.M., Boeckmann, J.M., Grantham, J., Holzhauer, J. 2005. Impaired cycling of soil nitrogen under continuous rice rotations in the arkansas grand prairie area. Rice Technical Working Group Meeting Proceedings. p. 148-149.

EFFECTS OF ROTATION, TILLAGE, FERTILITY, AND VARIETY ON RICE GRAIN YIELD AND NUTRIENT UPTAKE - (Abstract)

Anders, M.M., Olk, D.C., Grantham, J., Holzhauer, J. 2005. Effects of rotation, tillage, fertility, and variety on rice grain yield and nutrient uptake. Rice Technical Working Group Meeting Proceedings. P. 159-160.

NITROGEN MINERALIZATION FROM HUMIC ACID FRACTIONS IN RICE SOILS DEPENDS ON DEGREE OF HUMIFICATION - (Peer Reviewed Journal)

Nguyen, B.V., Olk, D.C., Cassman, K.G. 2004. Nitrogen mineralization from humic acid fractions in rice soils depends on degree of humification. Soil Science Society of America Journal. 68:1278-1284.

CHARACTERIZATION OF HUMIC ACID FRACTIONS IMPROVES ESTIMATES OF NITROGEN MINERALIZATION KINETICS FOR LOWLAND RICE SOILS - (Peer Reviewed Journal)

Nguyen, B., Olk, D.C., Cassman, K.G. 2004. Characterization of humic acid fractions improves estimates of nitrogen mineralization kinetics for lowland rice soils. Soil Science Society of America Journal. 68:1266-1277.

DOES ANAEROBIC DECOMPOSITION OF CROP RESIDUES ALTER NUTRIENT CYCLING AND SOIL ORGANIC MATTER QUALITY? - (Abstract)

OLK, D.C. DOES ANAEROBIC DECOMPOSITION OF CROP RESIDUES ALTER NUTRIENT CYCLING AND SOIL ORGANIC MATTER QUALITY?. ASA-CSSA-SSSA PROCEEDINGS. 2003. CD-ROM. MADISON, WI. ASA-CSSA-SSSA.

DETECTION OF AROMATIC-BONDED N AND ASSOCIATED LIGNIN RESIDUES IN A HUMIC FRACTION BY ADVANCED SOLID-STATE NMR - (Abstract)

MAO, J., OLK, D.C., SCHMIDT-ROHR, K. DETECTION OF AROMATIC-BONDED N AND ASSOCIATED LIGNIN RESIDUES IN A HUMIC FRACTION BY ADVANCED SOLID-STATE NMR. ASA-CSSA-SSSA PROCEEDINGS. 2003. CD-ROM. MADISON, WI. ASA-CSSA-SSSA.

SOIL AND PLANT NITROGEN CYCLING UNDER TILLAGE PRACTICES IN RICE-BASED ROTATIONS IN ARKANSAS - (Abstract)

ANDERS, M.M., OLK, D.C., GRANTHAM, J., HOLZHAUER, J. SOIL AND PLANT NITROGEN CYCLING UNDER TILLAGE PRACTICES IN RICE-BASED ROTATIONS IN ARKANSAS. ASA-CSSA-SSSA PROCEEDINGS. 2003. CD-ROM. MADISON, WI. ASA-CSSA-SSSA.

QUANTITATIVE SOLID-STATE 13C NMR SPECTROSCOPY OF ORGANIC MATTER FRACTIONS IN LOWLAND RICE SOILS - (Peer Reviewed Journal)

Smernik, R.J., Olk, D.C., Mahieu, N. 2004. Quantitative solid-state 13c NMR spectroscopy of organic matter fractions in lowland rice soils. European Journal of Soil Science. 55(2):367-379.

BEST MANAGEMENT PRACTICES RESEARCH IN A WATERSHED WITH SWINE PRODUCTION FACILITIES - (Other)

TOMER, M.D., OLK, D.C. BEST MANAGEMENT PRACTICES RESEARCH IN A WATERSHED WITH SWINE PRODUCTION FACILITIES. NATIONAL PORK BOARD WEB SITE . 2003.

ORGANIC MATTER QUALITY, NITROGEN CYCLING AND YIELD TRENDS IN INTENSIVELY CROPPED PADDY SOILS - (Book/Chapter) - (15-May-03)

CHARACTERIZATION OF SOIL ORGANIC MATTER IN TROPICAL RICE SOILS BY ADVANCED SOLID-STATE NMR - (Abstract)

SCHMIDT-ROHR, K., MAO, J., OLK, D.C. CHARACTERIZATION OF SOIL ORGANIC MATTER IN TROPICAL RICE SOILS BY ADVANCED SOLID-STATE NMR. AMERICAN CHEMICAL SOCIETY NATIONAL MEETING. 2003. PAPER NO. GEOC-058.

EXTRACTION OF HUMIC ACID FRACTIONS BASED ON BINDING TO SOIL POLYVALENT CATIONS. - (Abstract)

OLK, D.C. EXTRACTION OF HUMIC ACID FRACTIONS BASED ON BINDING TO SOIL POLYVALENT CATIONS. AGRONOMY ABSTRACTS. 2002. CD-ROM. MADISON, WI.

ORGANIC FORMS OF SOIL NITROGEN - (Book/Chapter)

Olk, D.C. 2008. Organic forms of soil nitrogen. In: Schepers, J.S., Raun, W.R., editors. Nitrogen in Agricultural Systems. Agronomy Monograph 49. ASA-CSSA-SSSA, Madison, WI. p. 57-100.

THE ROLE OF ORGANIC MATTER QUALITY IN NITROGEN CYCLING AND YIELD TRENDS IN INTENSIVELY CROPPED PADDY SOILS - (Proceedings/Symposium)

OLK, D.C., CASSMAN, K.G. ORGANIC MATTER QUALITY, NITROGEN CYCLING, AND YIELD TRENDS IN INTENSIVELY CROPPED PADDY SOILS. WORLD CONGRESS OF SOIL SCIENCE. 2002. CD-ROM. BANGKOK, THAILAND.

STRAW MANAGEMENT AFFECTING METHANE EMISSIONS FROM DIFFERENT RICE ECOSYSTEMS - (Proceedings/Symposium)

WASSMANN, R., BUENO, C.S., LANTIN, R.S., LU, W.F., CHAREONSILP, N., OLK, D.C. STRAW MANAGEMENT AFFECTING METHANE EMISSIONS FROM DIFFERENT RICE ECOSYSTEMS. WORLD CONGRESS OF SOIL SCIENCE. 2002. CD-ROM. BANGKOK, THAILAND.