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The Movement of Zinc to Plant Roots¹

ABSTRACT

Previous workers have classified nutrients on the basis of their movement patterns to plant roots, as shown by autoradiographic techniques, together with calculations using soil and plant nutrient levels and transpiration ratios. Autoradiographs of ⁶⁵Zn depletion were similar to those shown by other workers for ³²P. No difference was observed in zinc levels in tops or roots when transpiration ratios were trebled (from 49 ml/g to 173 ml/g), indicating that zinc absorption is not dependent on mass flow of solution to the roots.

¹ Contribution from the Dept. of Soil Science and Plant Nutrition, Institute of Agriculture, Univ. of Western Australia, Nedlands, Western Australia 6009. The senior author wishes to acknowledge assistance from the International Atomic Energy Agency, Vienna, and the Australian Wheat Research Council.

² Ph.D. Student, Senior Lecturer in Plant Nutrition, and Professor of Soil Science, Department of Soil Science and Plant Nutrition, Univ. of Western Australia.

Received for publication April 15, 1968. Accepted for publication June 24, 1968.