Literature
- Beckett , P. H. T. and White , R. E. 1964 . Studies on the phosphate potentials of soils. Part III. The pool of labile inorganic phosphate . Plant and Soil , 21 : 253 – 282 .
- Boken , E. 1958 . Investigations on determinations of the available manganese content in soils . Plant and Soil , 9 : 269 – 285 .
- Bondorff , K. A. 1950 . Unders⊘gelser over manganindholdet i dansk jord. IV. Bestemmelse af ombytteligt mangan . Tidskr. Planteavl. , 53 : 336 – 342 .
- Damsgaard-S⊘rensen , P. 1942 . Kationbytning i Jord. III. Bidrag til Kationombytningens almindelige Teori og dens anvendelse ved Bestemmelse af de ombyttelige Kaliumioner i Jord . Tidskr. Planteavl. , 46 : 1 – 150 .
- Lamm , C. G. 1964 . Mangans kemi i jordbunden , Kobenhavn : Akademisk forlag . Dissert
- Lamm , C. G. and Andersen , J. M. 1969 . Plant nutrient availability in soils. Part I. Quantity-intensity relationships of phosphorus . Acta Agr. Scand. , in press
- Olsen , S. R. , Kemper , W. D. and Jackson , R. D. 1962 . Phosphate diffusion to plant roots . Soil Sci. Soc. Amer. Proc. , 26 : 222 – 227 .