Nitrogen compounds, like urea, a big component of urine, are transformed over several steps.

含氮化合物如尿的主要组成成分尿素则经过几步被转化。

youdao

Types of fertilizer with nitrogen fertilizer, per mu can be with human excrement urine thin 1500 ~ 2000 kg, 5 ~ 10 kg urea.

肥料种类以氮肥为主，每次每亩可施有稀薄的人粪尿液1500 ~ 2000公斤，加入尿素5 ~ 10公斤。

youdao

Nitrogen compounds, like urea, a big component of urine, are transformed over several steps.

FORBES: Magazine Article

In a 2011 ruling, Duffy wrote that while Yousef was awaiting trial, he had been trying to collect urea -- a component of urine -- and a type of watch that had been used in a detonator in the airline bomb plot.

CNN: '93 WTC plotter Ramzi Yousef wants contact ban lifted

Indeed, a calculation Dr Ip performed, based on the volume and composition of the urine he collected in the plastic buckets, and of the head-dunking water at the end of each day, suggested that only 6% of the urea excreted by the turtles was leaving them in the traditional manner, via urine.

ECONOMIST: Softshell turtles urinate through their mouths