Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.

化肥和粪肥都释放氮到自然生态系统，如河流，从而破坏自然的平衡。

youdao

This is largely because of reductions in fertiliser use and the amount of nitrogen leaching from manure.

这是相当大的一部分，因为可以减少施肥和从动物粪便中滤出的氮。

youdao

Manure has become a minor source of nitrogen in all major agricultural countries.

在主要的农业国家动物粪便已经不是氮肥的主要来源。

youdao

That is mostly produced by the nitrogen in pig manure, and the team of scientists said they might one day be able to tackle that problem too.

BBC: GM pigs to produce cleaner manure

Roundup Ready herbicides and nitrogen fertilizers replaced manure and compost.

FORBES: The New Green Revolution: A Vision For Small-Scale Urban Farming