EFFECT OF SOIL MOISTURE AND RAINFALL ON CHEMICAL TRANSFORMATIONS IN CYANAMID GRANULES

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Abstract
Four plots of soil were given (NH4)2SO4 on 1 and granular Cyanamide on 3, with all as surface applications. On the former and 1 of the latter, water was withheld for a fortnight and then applied at 4-day intervals in amts. as were absorbed in 15 min. On 1 cyanamid plot, water was sprinkled lightly at 4, 8, and 12 days and then after 2 weeks the treatment was similar to that of the others. On the 3d plot water was added immediately in quantities absorbed in 30 min., and then given sprinklings at 4-day intervals. Cyanamid granules on the surface in the dry period became coated with an insoluble white crust of calcium carbonate and dicyandiamide. When exposed to moist air, more than one-third of the nitrogen either changed to dicyandiamide or was lost as ammonia in 8 days. Precipitation at the time of applying cyanamid leached most of the nitrogen into the soil. These results suggest working the cyanamid into the soil to prevent N loss unless rainfall follows immediately after surface applications.

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