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Supply of Ca, Sr, Mn, and Zn to Plant Roots Growing in Soil¹

ABSTRACT

The influence of four soils and two transpiration rates on the amounts of Ca, Sr, Mn, and Zn supplied to the root by root interception, mass-flow and diffusion and on the uptake of these ions by four plant species was investigated in a growth chamber experiment. The relation between the calculated supply to the root by root-interception plus mass-flow and the uptake of Ca and Sr was different for each species but was not affected by soil or transpiration rate. The relation between supply of Mn and Zn and uptake was not affected by plant species. The relation of the uptake of Mn was highly correlated with supply by root interception plus mass-flow over a very wide range of values. The correlation observed between Zn uptake and the supply by root interception plus mass-flow was lower than for Ca, Sr, or Mn because considerable quantities of Zn also reached the root by diffusion.

Three methods of calculating the quantity of root interception were evaluated by determining the relative degree of correlation between the calculated supply and uptake by the plant. The method which estimates the maximum possible root interception gave the highest correlation. The use of a parameter based on root area was very poorly correlated with uptake.

¹ Journal paper no. 3082, Purdue University, Agr. Exp. Sta., Lafayette, Ind. Contribution from the Department of Agronomy. This study was supported in part by the US Atomic Energy Commission under contract AT(11-1)-1495.

² Former graduate assistant, Purdue University. Now Assistant Professor, University of Saskatchewan, Saskatoon Canada; Professor of Agronomy and graduate assistants, Purdue University, respectively.

Received for publication May 16, 1967. Accepted for publication October 20, 1967.