REFERENCES
- “ CTIC. ” . In Crop Residue Management, U.S., 1998 , Conservation Technology Information Center: West Lafayette, IN http://www.ctic.purdue.edu/ (accessed August 2000).
- Unger , P. W. 1991 . Organic Matter, Nutrient: An pH Distribution in No- and Conventional-tillage in Semiarid Soils. . Agron. J. , 83 : 186 – 189 .
- Lal , R. 1976 . No-tillage Effects on Soil Properties under Different Crops in Western Nigeria. . Soil Sci. Soc. Am. J. , 40 : 72 – 768 .
- Blevins , R. L. , Thomas , G. W. , Smith , M. S. , Frye , W. W. and Cornelius , P. I. 1983 . Changes in Soil Properties after 10 Years Continuous Non-tilled and Conventionally Tilled corn. . Soil Tillage Res. , 3 : 135 – 146 .
- Lal , R. , Mahboubi , A. A. and Fausey , N. R. 1994 . Long-term Tillage and Rotation Effects on Properties of a Central Ohio Soil. . Soil Sci. Soc. Am. J. , 58 : 517 – 522 .
- Riedill , W. E. , Schumacher , T. E. , Clay , S. A. , Ellsbury , M. M. , Pravecek , M. and Evenson , P. D. 1998 . Corn and Soil Fertility Responses to Crop Rotation with Low, Medium, or High Inputs. . Crop Sci. , 38 : 427 – 433 .
- Edwards , J. H. , Wood , C. W. , Thurlow , D. L. and Ruf , M. E. 1992 . Tillage and Crop Rotation Effects on Fertility Status of a Hapludult Soil. . Soil Sci. Soc. Am. J. , 56 : 1577 – 1582 .
- Heenan , D. P. and Taylor , A. C. 1995 . Soil pH Decline in Relation to Rotation, Tillage, Stubble Retention and Nitrogen Fertilizer in S.E. . Australia. Soil Use Mgt. , 11 : 4 – 9 .
- Dick , W. A. , McCoy , E. L. , Edwards , W. M. and Lal , R. 1991 . Continuous Application of No-tillage to Ohio Soils. . Agron. J. , 83 : 65 – 73 .
- Havlin , J. L. , Kissel , D. E. , Maddux , L. D. , Claassen , M. M. and Long , J. H. 1990 . Crop Rotation and Tillage Effects on Soil Organic Carbon and Nitrogen. . Soil Sci. Soc. Am. J. , 54 : 448 – 452 .
- Schreiber , M. M. , Abney , T. S. and Foster , J. E. 1987 . Integrated Pest Management Systems: A Research Approach Vol. 985 , 1 – 31 . West Lafayette, IN : Purdue University: . AES Res. Bull.
- Frank , K. , Beegle , D. and Denning , J.Phosphorus. 1998 . InRecommended Chemical Soil Test Procedures for the North Central Region Edited by: Brown , J. R. Vol. 221 (revised 1998) , 21 – 30 . Columbia, MO : Missouri Agric. Expt. Sta.: . NCR Publ.
- Warncke , D. and Brown , J. 1998 . “ Potassium and Other Basic Cations. ” . In InRecommended Chemical Soil Test Procedures for the North Central Region Edited by: Brown , J. R. Vol. 221 (revised 1998) , 31 – 34 . Columbia, MO : Missouri Agric. Expt. Sta.: . NCR Publ.
- Whitney , D. A. 1998; . 221 (revised 1998) : 41 – 44 . NCR Publ.
- Combs , S. M. and Nathan , M. V. 1998 . “ Soil Organic Matter. ” . In InRecommended Chemical Soil Test Procedures for the North Central Region Edited by: Brown , J. R. Vol. 221 (revised 1998) , 53 – 58 . Columbia, MO : Missouri Agric. Expt. Sta.: . NCR Publ.
- Olsen , S. R. and Sommers , L. E. 1982 . “ Phosphorus. ” . In InMethods of Soil Analysis, Part 2 , 2nd Ed.; Edited by: Page , A. L. , Miller , R. H. and Keeney , D. R. Vol. 9 , 403 – 440 . Madison, WI : American Society of Agronomy: . Agron. No.
- Gomez , K. A. and Gomez , A. A. 1984 . “ Analysis of Multiple-sample Data. ” . In InStatistical Procedures for Agricultural Research , 2nd Ed.; Vol. 6 , 241 – 271 . New York : John Wiley & Sons, Inc.: . Chapt.