References
- Hochmuth , G. 1994 . Efficiency ranges for nitrate‐nitrogen and potassium for vegetable petiole sap quick tests . HortTechnology , 4 : 218 – 222 .
- Kleinkopf , G.E. and Westermann , D.T. 1992 . Scheduling nitrogen applications for Russet Burbank Potatoes , University of Idaho, College of Agriculture Current Information . Series No. 637.
- McDole , D.T. , Westermann , D.T. , Kleinschmidt , G.D. , Kleinkopf , G.E. and Ojala , J.C. 1987 . Idaho fertilizer guide—Potatoes , Current Information Series No. 261 University of Idaho, College of Agriculture .
- Rosen , C.J. and Errebhi , M. Interpretation of the petiole nitrate sap test for potato . Presentation made at the Valley Potato Expo Educational Program . February 17 1994 . North Dakota : Grand Forks .
- Vitosh , M.L. and Silva , G.H. 1994 . A rapid petiole sap nitrate‐nitrogen test for potatoes . Commun. Soil Sci. Plant Anal. , 25 : 183 – 190 .
- Department of Agronomy, Oklahoma State University, Stillwater, OK 74078