. Bulletin. ACTION OF MANGANESE IN SOILS. 13 Table III.—Effect of manganese (50 parts per million) on growth and oxidation in extracts of a poor sandy loam soil. (Untreated extract taken as 100.) Relative oxidation. Extract Extract+MnCl2 Extract+ Extract+Mn(N03)2 Extract+ 100 116 140 200 196 There was an increased oxidation power of the plant roots in the manganese cultures. Each of the salts caused an increase in oxida- tion and also an increase in the growth. The manganese chloride increased oxidation 16 per cent and growth 14 per cent. The sulphate in
. Bulletin. ACTION OF MANGANESE IN SOILS. 13 Table III.—Effect of manganese (50 parts per million) on growth and oxidation in extracts of a poor sandy loam soil. (Untreated extract taken as 100.) Relative oxidation. Extract Extract+MnCl2 Extract+ Extract+Mn(N03)2 Extract+ 100 116 140 200 196 There was an increased oxidation power of the plant roots in the manganese cultures. Each of the salts caused an increase in oxida- tion and also an increase in the growth. The manganese chloride increased oxidation 16 per cent and growth 14 per cent. The sulphate increased oxidation 40 per cent and growth 16 per cent. The nitrate increased oxidation 100 per cent and growth 8 per cent. The car- bonate increased oxidation 96 per cent and growth 11 per cent. It should here be noted in connection with the last two compounds that root oxidation is also greatly increased by nitrates and by alkaline conditions, as shown by Schreiner and The high oxidation here noted is therefore the summation of the effects of manganese and nitrate or carbonate, respectively. The greatest amount of oxidation in the solutions containing the different salts of manganese does not give the largest increase in growth. This suggests that the oxidation in the solutions contain- ing the nitrate and carbonate in the amounts of 50 parts per million was perhaps too great for the best growth in this culture medium. Another experiment with this soil extract was made using several concentrations of manganese sulphate, namely, 10, 30, and 50 parts per million. Two cultures were run in each treatment. The experi- ment continued from February 9 to February 19. .The results are given in Table IV. Table IV. -Effect of manganese sulphate on oxidation and growth of wheat in extracts of a poor sandy loam. ( Untreated taken as 100.) Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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