References
- Bremner , J.M. 1965 . “ Inorganic forms of nitrogen ” . In Methods of Soil Analysis , Chemical and Microbiological Properties Edited by: Black , C.A. , Evans , D.D. , White , J.L. , Ensminger , I.E. and Clark , F.E. 1179 – 1237 . Madison , WI : American Society of Agronomy . Part 2
- Bremner , J.M. and Keeney , D.R. 1966 . Determination and isotope‐ratio analysis of different forms of nitrogen in soils. I. Exchangeable ammonium, nitrate, and nitrite by extraction‐distillation methods . Soil Sci. Soc. Am. Proc. , 30 : 577 – 582 .
- Freney , J.R. and Wetselaar , R. 1967 . The Determination of Mineral Nitrogen in Soil with Particular Reference to Nitrate , Tech. Paper No. 23 Canberra , , Australia : CSIRO, Division of Plant Industry .
- Jemison , J.M. and Fox , R.H. 1988 . Quick test procedure for soil and plant tissue nitrates using test strips and hand‐held reflectometer . Commun. Soil Sci. Plant Anal. , 19 : 1569 – 1582 .
- Markus , D.K. , McKinnon , J.P. and Buccafuri , A.J. 1985 . Automated analysis of nitrite nitrate and ammonium nitrogen in soils . Soil Sci. Soc. Am. Proc. , 49 : 1208 – 1215 .
- Myers , R.J.K. 1984 . A simple model for estimating the nitrogen fertilizer requirement of a cereal crop . Fert. Res. , 5 : 95 – 108 .
- Oehmichen , J. 1987 . Fertilization test: How accurate is the nitrate‐measuring instrument Nitrachek? A new method for soil analysis . Die Landtechnische Zeitschrift , 38 : 44 – 46 . (in German)
- Roth , G.W. , Beegle , D.B. , Fox , R.H. , Toth , J.D. and Pedkielet , W.P. 1991 . Development of a quick test method to measure soil nitrate . Commun. Soil Sci. Plant Anal. , 22 : 191 – 200 .
- Sims , J.T. , Vasilas , B.L. , Gartley , K.L. , Milliken , B. and Green , V. 1995 . Evaluation of soil and plant nitrogen tests for maize on manured soils of the Atlantic coastal plain . Agron. J. , 87 : 213 – 222 .