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Perennial crops are crops developed to reduce inputs necessary to produce food.〔〔 By greatly reducing the need to replant crops from year-to-year, perennial cropping can reduce topsoil losses due to erosion,〔 increase biological carbon sequestration within the soil, and greatly reduce waterway pollution through agricultural runoff. ==Mechanisms== *Erosion Control: Because plant materials (stems, crowns, etc.) can remain in place year-round, topsoil erosion due to wind and rainfall/irrigation is reduced〔 *Water-use efficiency: Because these crops tend to be deeper and more fibrously-rooted than their annual counterparts, they are able to hold onto soil moisture more efficiently,〔 while filtering pollutants (e.g. excess nitrogen) traveling to groundwater sources.〔 *Nutrient cycling efficiency: Because perennials more efficiently take up nutrients as a result of their extensive root systems,〔 reduced amounts of nutrients need to be supplemented,〔 lowering production costs while reducing possible excess sources of fertilizer runoff. *Light interception efficiency: Earlier canopy development and longer green leaf duration increase the seasonal light interception efficiency of perennials, an important factor in plant productivity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Perennial crop」の詳細全文を読む スポンサード リンク
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