Radio-Autographs of Manganese in Plants

Abstract

Flax, peas, cabbage, and tomato plants were grown in nutrient solutio::ls to which radio-active manganese (0.035 mc. of Mn54 ) was added with an excess of non-labelled manganese. The treatments included an excess of molybdenum as ammonium molybdate or sodium molybdate in addition to the excess manganese. With flax and peas a further radio-active treatment was studied in which the total manganese level was normal (0.5 p.p.m.). Radio-autographs and radio-assays of various plant tissues were made.