| definition |
- An agricultural technique in which, season after season, each field is sown with crop plants in a regular rotation, each crop being repeated at intervals of several years. Crop rotation minimizes the risks of depleting the soil of particular nutrients. In rotation systems, a grain crop is often grown the first year, followed by a leafy-vegetable crop in the second year, and a pasture crop in the third. The last usually contains legumes; such plants can restore nitrogen to the soil. Notwithstanding, high yields tend to depend upon the continued addition of chemical fertilizers to the soil.
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| Abstract from DBPedia | Crop rotation is the practice of growing a series of different types of crops in the same area across a sequence of growing seasons. It reduces reliance on one set of nutrients, pest and weed pressure, and the probability of developing resistant pests and weeds. Growing the same crop in the same place for many years in a row, known as monocropping, gradually depletes the soil of certain nutrients and selects for a highly competitive pest and weed community. Without balancing nutrient use and diversifying pest and weed communities, the productivity of monocultures is highly dependent on external inputs. Conversely, a well-designed crop rotation can reduce the need for synthetic fertilizers and herbicides by better using ecosystem services from a diverse set of crops. Additionally, crop rotations can improve soil structure and organic matter, which reduces erosion and increases farm system resilience.輪作（りんさく、Crop rotation）は、農業の手法の1つで、同じ土地に別の性質のいくつかの種類の農作物を何年かに1回のサイクルで作っていく方法。 これに対し、1種類の作物を育て続けるのは単作（たんさく）、同じ畔で同時に複数の作物を育てる方法を混作（こんさく）、畔ごとに交互に違った作物を同時に育てるのを間作（かんさく）という。 (Source: http://dbpedia.org/resource/Crop_rotation) |
