. Journal of agricultural research . In the highest concen-tration the ripening was slow and there was some indication of shrinkageof the grain before the period of desiccation. The total yields as shownbelow are greater in the higher concentrations, although there is nosignificant difference between the concentrations of and or , for the yield of heads and even the difference in the yieldsof stems and leaves are not necessarily significant. 92 Journal of Agricultural Research voi. xviu. no. 2 AIR-DRY WEIGHT PER PLANT. Concentra-tion ofsolution. Heads. Steins andleaves
. Journal of agricultural research . In the highest concen-tration the ripening was slow and there was some indication of shrinkageof the grain before the period of desiccation. The total yields as shownbelow are greater in the higher concentrations, although there is nosignificant difference between the concentrations of and or , for the yield of heads and even the difference in the yieldsof stems and leaves are not necessarily significant. 92 Journal of Agricultural Research voi. xviu. no. 2 AIR-DRY WEIGHT PER PLANT. Concentra-tion ofsolution. Heads. Steins andleaves. Roots. 0 •30 •77 o Based on lo plants. The conclusion may be drawn from the foregoing observations that thegreater concentration or supply of one or more ions present during thelater stage^ prolongs the period of vegetative growth and possibly inter-feres with the processes of ripening, without producing any large increasein yield. ofij^/a/A/^i SO/..JZTJ. ^Oe/G/AML so^.j^ ^foe/s/AC^A ) £>fys. Fig. 3.—Water cultures, series 2. Graph showing absorption of nutrients from solutions of three con-centrations during latter part of growth cycle. Solutions not changed during the final 80 days. The absorption was followed each week by means of conductivitymeasurements, by removing portions of solutions from the culture bottlesafter adding water to restore the original volume. The solution wasthoroughly mixed by passing a current of air through it. After theconductivity was determined the samples were returned to the originalbottles. The course of absorption is graphically indicated in figure data are calculated to percentages of total electrolytes absorbed Oct. IS, 1919 Relation of Nutrient Medium to Plant Absorption 93 on the basis of the original solution. At the end of the experimentcomposite samples were made of each solution, and these were analyzedfor the important elements present. Th
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