| 摘要 |
PURPOSE: A nitrogen fertilizer composition for the supply of nitrogen and a nitrogen fertilizer supply apparatus containing the composition are provided, whose nitrogen supply efficiency is maintained for 200-250 days constantly. CONSTITUTION: The nitrogen fertilizer composition comprises 10-45 wt.% of (NH4)2SO4; 10-45 wt.% of urea; 0.1-3 wt.% of dicyanoamide as a nitration inhibiting agent; and the balance of a binder. Preferably the binder is clay or gypsum. The apparatus is cylinder-shaped one whose upper and lower parts are open. Preferably the cylindrical apparatus is made of a biodegradable material comprising paper, and has additional layer(23) containing a plurality of holes(24) in the lower part. Optionally the apparatus comprises further a sand layer(25) or a diffusion buffering layer in the upper or lower part in addition to the nitrogen fertilizer composition layer(22).
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