섬유

land spreading in the tennessee valley

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 277
in 1978, tva and florence, alabama, began a cooperative experiment to evaluate land application as a means of sewage sludge disposal and crop fertilization. the research included an evaluation of sludge effects on grund water and surface runoff and a documentation of growth responses by bermuda-grass, cotton, corn and soybeans. sludge applied at a rate of five dry tons per acre was an effective source of ntrogen (n), phosphorus (p), and, to a lesser extent, potassium (k) for crop growth. the cost of commercial fertilizer needed for a similar level of production was about 80 dollars per acre. plant tissue and soil analyses showed that crop uptake or downward movement of heavy metals presented no hazard to consumers or the environment. the concurrent water-quality studies showed that sludge application did not cause significant degradation of surface-water or ground-water quality. 4 refs
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