Читать книгу Applied Soil Chemistry - Группа авторов - Страница 22

Introducing organic supplements to agricultural land that is over and above the carbon input resulting from the rotation cycle of crops grown on the land does act to increase the resulting carbon stored in a soil. The simplest way to achieve this is to extensively mulch land with composts and manures. In some developing countries and communities, manure/dung is dried and combusted as low-grade domestic and communal fuel, rather returned to the land. Composted municipal waste and sewage sludges are also applied as organic supplements to farmland at agricultural scales. These can introduce harmful chemicals, such as heavy metals, into soils, so their compositions have to be carefully monitored. Such treatments can also have negative impacts on the biodiversity of both flora and fauna supported by the land if applied inappropriately. Arable farmland generally responds well to such supplements, but grasslands growing on poor soils can be damaged by them [30, 31].