References
- Barr , A. J. , Goodnight , J. H. , Sall , J. P. , Blair , W. H. and Chilko , D. M. 1979 . “ Stepwise procedure ” . In SAS User's Guide , Edited by: Helwig , J. T. and Council , K. A. 391 – 396 . Raleigh, North Carolina : SAS Inc. .
- Colbourn , R. and Thornton , I. 1978 . Lead pollution in agricultural soils . Journal of Soil Science , 29 : 513 – 526 .
- Day , P. 1965 . “ Particle fractionation and particle size analysis ” . In Methods of Soil Analysis , Edited by: Black , C. A. , Evans , D. D. , Ensminger , L. E. , Clark , F. E. and White , J. L. 545 – 567 . Madison, Wisconsin : American Society of Agronomy .
- Harter , R. D. 1979 . Adsorption of copper and lead by Ap and B2 horizons of several northeastern United States soils . Soil Science Society of America Journal , 43 : 674 – 683 .
- John , M. K. 1972 . Lead availability related to soil properties and extractable lead . Journal of Environmental Quality , 1 : 295 – 298 .
- Lagerwerff , J. V. 1971 . Uptake of cadmium, lead and zinc by radish from soil and air . Soil Science , 111 : 129 – 133 .
- Lagerwerff , J. V. 1972 . “ Lead, mercury and cadmium as environmental contaminants ” . In Micronutrients in Agriculture , Edited by: Mortvedt , J. J. , Giordano , J. M. and Lindsay , W. L. 593 – 636 . Madison, Wisconsin : Soil Science Society of America .
- Lindsay , W. L. and Norvell , W. A. 1978 . Development of a DTPA soil test for zinc, iron, manganese, and copper . Soil Science Society of America Journal , 42 : 421 – 428 .
- Maclean , A. J. , Halsted , R. L. and Finn , B. J. 1969 . Extractability of added lead in soil and its concentration in plants . Canadian Journal of Soil Science , 49 : 327 – 334 .
- Miller , W. P. and McFee , W. W. 1983 . Distribution of Cd, Zn, Cu, and Pb in soils of industrial northwestern Indiana . Journal of Environmental Quality , 12 : 29 – 33 .
- Miller , W. P. , McFee , W. W. and Kelly , J. M. 1983 . Mobility and retention of heavy metals in sandy soils . Journal of Environmental Quality , 12 : 29 – 33 .
- Misra , S. G. and Pande , P. 1976 . Evaluation of suitable extradant for available lead in soil . Plant and Soil , 45 : 693 – 696 .
- Nelson , D. W. and Sommers , L. E. 1982 . “ Total carbon, organic carbon and organic matter ” . In Methods of Soil Analysis , Edited by: Page , A. L. , Miller , R. H. and Keeney , D. R. 539 – 549 . Madison, Wisconsin : American Society of Agronomy .
- Olsen , S. R. , Cole , C. V. , Watanabe , F. S. and Dean , L. A. 1954 . “ Estimation of available phosphorus in soils by extraction with sodium bicarbonate ” . In USDA Circular 939 , Washington, DC : U.S. Government Printing Office .
- Richards , L. A. 1954 . Diagnosis and Improvement of Saline and Alkaline Soils , USDA Handbook No. 60 Washington, DC : U.S. Government Printing Office .
- Silviera , D. J. and Sommers , L. E. 1977 . Extractability of copper, zinc, cadmium and lead in soils incubated with sewage sludge . Journal of Environmental Quality , 6 : 47 – 52 .
- Soil Conservation Service . 1972 . Soil Survey Laboratory Methods and Procedures for Collecting Soil Samples , Washington, DC : USDA‐SCS. U.S. Government Printing Office .
- Soltanpour , P. N. , Workman , S. M. and Schwab , P. A. 1979 . Use inductively coupled plasma spectrometer for the simultaneous determination of macro and micronutrients in NH4HCO3‐DTPA extracts of soils . Soil Science Society of America Journal , 43 : 75 – 78 .
- Stover , R. C. , Sommers , L. E. and Silviera , D. J. 1976 . Evaluation of metals in waste‐water sludges . Journal of Water Pollution , 48 : 2165 – 2175 .
- Thomas , G. W. 1982 . “ Exchangeable cations ” . In Methods of Soil Analysis , Edited by: Page , A. L. , Miller , R. H. and Keeney , D. R. 159 – 165 . Madison, Wisconsin : American Society of Agronomy .