Showing papers on "Mineral absorption published in 1937"
TL;DR: Data are presented that were obtained by methods which controlled environmental conditions and largely eliminated growth differences in the plants by a shortening of the experimental growth period to a few days.
Abstract: ONE DOES not need to delve far into the voluminous literature pertaining to mineral absorption by plants to be convinced that there are many factors which may, either directly or indirectly, affect this process. From several sources, but more recently in a paper by Hoagland and Brover (1936), it is clear that aeration, respiration, temperature, initial salts in the root tissues and culture medium, and available carbohydrates in the plant are factors concerned in the absorption of minerals. Furthermore, the importance of such factors upon mineral absorption as synthesis of foods, assiinilation, and shoot-root growth is well illustrated by the work of Gustafson (1934), Muenscher (1922), Mendiola (1922), and others. Therefore, it seems only reasonable that to measure the effects of transpiration upon mineral absorption it will be necessary to keep all of these other influential factors as nearly constant as possible. For example, in an earlier paper by the writer on this subject (Freeland, 1936) the significance of the data was somewhat obscured by inequalities in growth and dry weight of the plants. The same criticism may be made of most of the data that have been presented to date for the purpose of showing that transpiration either does or does not affect the rate of absorption of minerals. It is the purpose of this paper to present data that were obtained by methods which controlled environmental conditions and largely eliminated growth differences in the plants by a shortening of the experimental growth period to a few days. Water cultures were used to facilitate speed and accuracy in manipulation.
34 citations