Title: Absorption and excretion of salts by roots, as influenced by concentration and composition of culture solutions
Identifier: absorptionexcret231true (find matches)
Year: 1912 (1910s)
Authors: True, Rodney H. (Rodney Howard), 1866-1940; Bartlett, Harley Harris, 1886-1960; United States. Bureau of Plant Industry
Subjects: Roots (Botany); Peas
Publisher: Washington, D. C. : Government Printing Office
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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28 ABSORPTION AND EXCRETION OF SALTS BY ROOTS. entirely overcomes the harmful effect on root growth of magnesium alone. The duration of cultures was eight days; temperature at the beginning 21.5°, at the end 19.5°. The influence of calcium on root development in the cultures of this series was extremely interesting. In experiment C, as in experi- ment 5, calcium nitrate was substituted for magnesium nitrate by increments of a hundredth of the total salt concentration of the solution. In the former case, however, the salt concentration was
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Fig. 16.—Seedlings of culture 14, experiment 3. such that magnesium nitrate alone killed the roots, whereas in the latter case it was such that magnesium nitrate alone retarded the growth of lateral roots and did not kill the primary. In experiment C the lateral roots did not attain as perfect a development as in dis- 92 tilled water until the ratio of magnesium to calcium reached -^-. In experiment 5, on the other hand, the first increment of calcium 99 (making the ratio of magnesium to calcium -=-) permitted laterals to develop as well as in distilled water. The concentration of calcium 231

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