Cyanamid Manufacture Chemistry And Uses By Edward J Pranke

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67. 5 — — — Lime-nitrogen 65. 6 69. 6 70. 6 74. 8 Dicyandiamide 66. 6 74. 3 73. 8 71. 5 The yields of grain were : Fertilized days before planting Fertilized with o 7 14 21 Ammonium sulphate • • . 29. 5 — — — Lime-nitrogen 28. 3 30. 0 29. 5 33. 2 Dicyandiamide 30. 5 33. 5 31. 7 33. 7 In this experiment the highest results were obtained with dicyandiamide applied a week before planting. When applied at the time of planting the results are about the same as those with ammonium sulphate.
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...TANCES AND TOXICITY.
There are several observations reported in the literature that may help us to understand why a chemically pure dicyandia- mide should be toxic, while an impure dicyandiamide may have a fertilizing value equal to that of ammonium sulphate.
It has been noted by Sabaschnikoff^ that a fertilization with chemically pure calcium cyanamide, in comparison with lime- nitrogen containing the same amount of nitrogen, gives only from one-third to one-half as large an increase in yield as is obtained from the lime-nitrogen, both being applied under exactly the same conditions.


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