| http://www.w3.org/ns/prov#value | - as the water passes down stream.A more popular option is planting cover crops, which help hold the soil and its nutrients in place after the primary crops have been harvested.Another option includes the use of filter strips and grass waterways ??? areas where the farmer purposefully leaves unplanted, except for grasses, to act as a filter between the field and the surface drainage structure.
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