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人尿和牲畜尿中都含有尿素。尿素是宝贵的氮肥。它不仅存在于人和动物的尿里,用人工的办法也能合成。一八二八年,德国化学家武勒首先发明了人工合成尿素的方法。现在这个方法已为人们所普遍掌握。
Human urine and livestock urine contain urea. Urea is a valuable nitrogen fertilizer. It not only exists in the urine of humans and animals, the use of artificial methods can be synthesized. In 1828, German chemist Vaule first invented the method of synthetic urea. Now this method has been widely used by people.