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ASH CONSTITUENTS OF PASTURE GRASSES, THEIR STANDARD ELECTRODE POTENTIALS AND ECOLOGICAL SIGNIFICANCE

ASH CONSTITUENTS OF PASTURE GRASSES, THEIR STANDARD ELECTRODE POTENTIALS AND ECOLOGICAL SIGNIFICANCE APRIL, 1930 H. P. COOPER Since there is a wide variation in the ash constituents of a species of plant grown under various conditions, it was decided to determine the ash constituents of several pasture grasses grown on soils differing widely in productivity. An examination of some available data on ash analyses of pasture plants suggested that the only way to secure definite information on this important topic was to attempt to determine, by correlating the existing data, the order of absorption and the condition necessary for optimum assimilation of the various nutrient ions. The lack of a close correlation between the H-ion concentration of the soil and plant growth suggested a consideration of the potential relations which might result from the presence in the soil complexes of electropositive elements above and below hydrogen in the electromotive series. Such a consideration soon made it evident that the electromotive series could be used very effectively in correlating much of the data in the field of nutrition. It was observed that there is a direct relation between the order of removal of ions from soil colloids by electrodialysis, and the order of atomic ions in the electromotive series (19, 20). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology American Society of Plant Biologist

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