Other significant sources of runoff include habitat modification and silviculture (forestry). By the 18th century, Japan had developed detailed scientific knowledge about silviculture and plantation forestry. In common usage, however, the term may cover a range of forestry or silviculture activities. The management of forests is known as [[forestry]], [[silviculture]], and [[forest management]]. The valley is famous for silviculture garden and medicinal plant cultivation. Both men are doing their research in the Silviculture and Ecology Section of the department. Under their leadership, mining, the main source of wealth, blossomed, along with agriculture and silviculture. In 16th-century Germany, landowners also developed silviculture to deal with the problem of deforestation. Silviculture and agriculture are prominent in this section of the region. While writing it, Cobbett also produced "The Woodlands" (1825), a book on silviculture. In the context of regeneration silviculture, "spring", "summer", etc. This erratic germination has been one of the main problems in silviculture of the species. Its silviculture reflects a century of research, observation and practice. Another variation of selection silviculture is group selection. To be useful in silviculture such terms must be clearly defined and consistently applied.