Direct measurement of petiole sap nitrate in potato to determine crop nitrogen status

References

• Roberts , S. and Cheng , H.H. 1988 . Estimation of critical nutrient range of petiole nitrate for sprinkler‐irrigated potatoes . Am. Potato J. , 65 : 119 – 124 .
   Web of Science ®Google Scholar
• Westcott , M.P. , Stewart , V.R. and Lund , R.E. 1991 . Critical petiole nitrate levels in potato . Agron. J. , 83 : 844 – 850 .
   Web of Science ®Google Scholar
• Williams , C.M.J. and Meir , N.A. 1990 . Determination of the nitrogen status of irrigated potato crops. 1. Critical nutrient ranges for nitrate‐nitrogen in petioles . J. Plant Nutr. , 13 : 971 – 984 .
   Web of Science ®Google Scholar
• Westermann , D.T. and Kleinkopf , G.E. 1985 . Nitrogen requirement of potatoes . Agron. J. , 77 : 616 – 621 .
   Web of Science ®Google Scholar
• Prasad , M. and Spiers , T.M. 1984 . Evaluation of a rapid method for plant sap nitrate analysis . Commun. Soil Sci. Plant Anal. , 15 : 673 – 679 .
   Web of Science ®Google Scholar
• Pastylianou , I. 1989 . Diagnosing nitrogen requirements of cereals in less than 30 seconds . Commun. Soil Sci. Plant Anal. , 20 : 1247 – 1259 .
   Web of Science ®Google Scholar
• Williams , C.M.J. and Meir , N.A. 1990 . Determination of nitrogen status of irrigated potato crops. II. A simple on farm quick test for nitrate‐nitrogen in petiole sap . J. Plant. Nutr. , 13 : 985 – 993 .
   Web of Science ®Google Scholar
• Turner , F.T. and Jund , M.F. 1991 . Chlorophyll meter to predict nitrogen topdress requirement for semidwarf rice . Agron. J. , 83 : 926 – 928 .
   Web of Science ®Google Scholar
• Piekielek , W.P. and Fox , R.H. 1992 . Use of a chlorophyll meter to predict sidedress nitrogen requirements for maize . Agron. J. , 84 : 59 – 65 .
   Web of Science ®Google Scholar
• Spectrum Technologies, Inc. Plant Sap Extraction , Plainfield , IL 60544 : 12010 South Aero Dr. .
   Google Scholar
• Lund , R.E. 1991 . MSUSTAT statistical analysis package. Version 5.00 , Bozeman , MT : Research and Development Institute, Inc., Montana State University .
   Google Scholar
• Snedecor , G.W. and Cochran , W.G. 1980 . Statistical methods. , 7th Edition , Ames , IA : Iowa State University Press .
   Google Scholar
• Rosen , C.J. 1991 . “ Interpreting nitrate sap tests for irrigated potato production ” . In Minnesota Fruit and Vegetable Growers Association Educational Conference Papers 79 – 81 . Minneapolis , MN
   Google Scholar
• Montana Agricultural Experiment Station Journal Series No. J‐28 18. Partial funding was provided by the Montana Fertilizer Advisory Committee.
   Google Scholar