Annual Report of the Agricultural Experiment Station of the University of Wisconsin for the Year ..
Annual Report of the Agricultural Experiment Station of the University of Wisconsin for the Year ..
University of Wisconsin--Madison. Agricultural Experiment Station
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Konig was able to remove only 70 per cent with a much stronge;r solution of hydrogen peroxide. A comparison of columns 3 and 4 shows that a very large increase in the solu- ble phosphoric acid is obtained by heat alone. But the differ- ences between the figures in 3 and 4 are considerably smaller in every case than the differences between the figures in 3 and 5 which .represent the increases obtained by oxidation alone. Per- haps the most notable thing in this table is that it shows for most of... the soils a decrease in the solubility of the phosphoric acid rather than an increase on heating subsequent to oxidation. In only two cases is an increase shown and they are so small as to be within the limit of experimental error. Where a de- crease is shown, it too is within the limit of experimental error. However, a decrease might be expected, for if ferric or alumi- num hydrate or ferric or aluminum oxide is present it will be- Digitized by VjOOQIC Effect of Heat and Oxygen on Soil Phosphorus 11 -come much less easily soluble after being heated to 230° than it was before.
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