. Botany of the living plant. Botany; Plants. THE WATER-RELATION in to the roots, and the effect on growth studied. The usual arrangement is shown in Fig. 75. A solution containing the above seven elements in suitable form usually results in satisfactory growth. Knop's culture solution is often employed in these experiments, and is made up as follows : calcium nitrate, 1-0 gm. ; potassium nitrate, potassium di-hydrogen phosphate and magnesium sulphate, 02 gm. each ; ferric chloride, a trace ; distilled water, I litre. By suitable adjust- ments of this formula, modified culture solutions can be
. Botany of the living plant. Botany; Plants. THE WATER-RELATION in to the roots, and the effect on growth studied. The usual arrangement is shown in Fig. 75. A solution containing the above seven elements in suitable form usually results in satisfactory growth. Knop's culture solution is often employed in these experiments, and is made up as follows : calcium nitrate, 1-0 gm. ; potassium nitrate, potassium di-hydrogen phosphate and magnesium sulphate, 02 gm. each ; ferric chloride, a trace ; distilled water, I litre. By suitable adjust- ments of this formula, modified culture solutions can be prepared. Fig. 75- Water Cultures of Barley. The plants in the left-hand jar had been grown in a solution containing all the essential elements. Certain elements were omitted from the other jars, as labelled. The glass tubes allow of aeration of the solutions. Photo. G. B. ( x i.) from which particular elements have been omitted. Thus instead of magnesium sulphate, potassium sulphate could be added, giving a magnesium-free solution. The growth of a plant in such a solution could then be studied, and by this procedure it is found that omission of any of the seven elements mentioned prevents proper growth (see Fig. 75). In addition to these elements it now appears that certain others, for example boron and manganese, must be accessible, to some plants at least, in order to secure proper growth. These elements are only needed in minute quantity, and it is probable that they are present in sufficient amount as impurities in ordinary water Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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Keywords: ., bookcentury1900, bookpublis, booksubjectbotany, booksubjectplants
