REFERENCES
- Fohse , D. , Claassen , N. and Jungk , A. 1988 . Phosphorus Efficiency of Plants. I External and Internal P Requirement and P Uptake Efficiency of Different Plant Species . Plant Soil , 110 : 101 – 109 .
- Trehan , S.P. and Claassen , N. 1998 . External K Requirement of Young Plants of Potato, Sugar Beet and Wheat in Flowing Solution Culture Resulting from Different Internal Requirements and Uptake Efficiency . Potato Res. , 41 : 229 – 237 .
- Trehan , S.P. and Claassen , N. 2000 . Potassium Uptake Effciency of Potato and Wheat in Relation to Growth in Flowing Solution Culture . Potato Res. , 43 ( 1 ) : 9 – 18 .
- Mengel , K. and Steffens , D. 1985 . Potassium Uptake of Ryegrass (Lolium perenne) and Red Clover (Trifolium pratense) as Related to Root Parameters . Biol. Fert. Soils , 1 : 53 – 58 .
- Meyer , D. and Jungk , A. 1993 . A New Approach to Quantify the Utilization of Non-exchangeable Soil Potassium by Plants . Plant Soil , 149 : 235 – 243 .
- Grewal , J.S. and Trehan , S.P. 1993 . “ Phosphorus and Potassium Nutrition of Potato ” . In Advances in Horticulture: Potato Edited by: Chadha , K.L. and Grewal , J.S. 261 – 298 . New Delhi : Malhotra Publishing House .
- Newman , E.I. 1966 . A Method of Estimating the Total Root Length in a Sample . J. Appl. Ecol. , 3 : 139 – 145 .
- Adams , F. 1974 . “ Soil Solution ” . In The Plant Root and Its Environment Edited by: Carson , E.N. 441 – 481 . Charlottesville, VA : University Press of Virginia .
- Lanyon , L.E. and Heald , W.R. 1982 . “ Magnesium, Calcium, Strontium and Barium ” . In Methods of Soil Analysis , 2nd Ed. Edited by: Page , A.L. , Miller , R.H. and Keeney , D.R. 252 Madison, WI : American Society of Agronomy . Part 2
- Desai , N.C. and Jaimini , S.N. 1997 . Phenotypic Stability for Tuber Yield in Potato (Solanum tuberosum L.) . J. Indian Potato Assoc. , 24 : 47 – 51 .
- Heming , S.D. and Rowel , D.L. 1985 . Soil Structure and Potassium Supply. I. The Release of Potassium from Soil Aggregates to Ca-Resin . J. Soil Sci. , 36 : 45 – 60 .
- Springob , G. Zur Kihetik der K-Fixierung und der K-Freisatzung in Losiboden Hannover , , Germany : University of Hannover .
- Kuchenbuch , R. and Jungk , A. 1984 . Wirkung der Kalium Dungung Auf Die Kalium Verfiigbarbait Inder Rhizosphare Vonraps . Z. Pflanzenernahr. Bodenk , 147 : 435 – 448 .
- Fohse , D. , Classen , N. and Jungk , A. 1991 . Phosphorus Efficiency of Plants. II. Significance of Root Radius, Root Hairs and Cation–Anion Balance for Phosphorus Influx in Seven Plant Species . Plant Soil , 132 : 261 – 272 .
- in press .