Chemical nitrogenous fertilizer

• 化学氮肥

Chemical nitrogenous fertilizer的用法和样例：

例句

1. But improved farming methods later increased their use yields andin , at the same time, made better use of chemical nitrogen fertilizer.
   但是不久以后改进耕种方法增加了农场的产量而且同时让化学氮肥的使用更合理。