?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=J+M&rft.au=Powell%2C+J+M&rft.aulast=Powell&rft.atitle=Crop+yield+and+the+fate+of+nitrogen+and+phosphorus+following+application+of+plant+material+and+feces+to+soil&rft.title=Nutrient+Cycling+in+Agroecosystems&rft.issn=1385-1314&rft.date=1999&rft.volume=54&rft.pages=215-226&rft.issue=3&rft.genre=article