主要品种有尿素和硫酸铵、硝酸铵、碳酸氢铵、氯化铵、石灰氨、氨水等。
The main varieties include urea, ammonium sulfate, ammonium nitrate, ammonium acid carbonate, ammonium chloride, ammonium lime and ammonia water.
B保水剂对尿素的保持效果8次淋溶后与C保水剂相近，对硝酸铵的保持效果介于其他两种保水剂之间。
The nitrogen holding capacity of SAP-B is similar to that of SAP-C after 8 rounds watering for urea, but it is moderate for ammonium nitrate.
以尿素和硝酸铵为原料 ，在催化剂的存在下合成硝酸胍。
The method of synthesis guanidine nitrate from urea and ammonium nitrate in the presence of catalyst is discribed in this paper.
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