There 's a reason so many gardeners swear by adding used coffee grounds to compost .
有一个道理让许多园丁喜欢用煮过的咖啡渣堆肥。
If you have poor soil you may want to add organic matter or a multi-purpose compost .
如果土壤贫瘠，可以加入一些有机肥或堆肥。
Prisoners grow their own organic vegetables , turn their garbage into compost and tend to chickens , cows , horses and sheep .
囚犯种植自己的有机蔬菜，将他们的垃圾转变为堆肥，并照料鸡、牛、羊。
Think of what you can reduce and re-use , and call your county or city waste management to find out about local compost programs .
想一想你能减少的东西和重新利用的东西，给你的县或城市废物管理站打个电话，看他们有没有当地堆肥项目。
Other scientists have looked at materials like leaf compost or manure , while professor brown favors composts high in iron content , like the sludge from wastewater treatment .
