In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.

在使用污泥的情况下，可以避免使用昂贵的化肥。

Technical improvements such as making fertilizer use and manure management more efficient will not be enough, the team said.

该研究团队表示，技术进步，如更加有效地利用化肥和有机肥，所能起的作用还不足。

"High commodity prices experienced over recent years led to increased production and correspondingly to greater fertilizer use," said Jan Poulisse, FAO fertilizer expert.

“近年来商品价格持续走高导致了产量的增长和相应的肥料利用量的提高，”粮农组织肥料专家Jan Poulisse说。