The nitrogen, which is in ammonium in the ammonia sulfite pulping waste liquor of rice straw, is converted into organic nitrogen by using oxide-ammonium decomposition method.

稻草亚硫酸铵法制浆废液采用氧化氨解的方法，将废液中的铵态氮转化为有机氮。

Some of the old teak rice barges are still around, and a few have been converted into floating hotels.

一些运载柚木和稻米的旧时驳船仍到处可见，有的则已改装成了水上旅馆。

50 thousand square kilometers of rice fields were converted to growing vegetables and other cash crops.

五万平方千米的稻田转而种起了蔬菜及其它经济作物。