?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S+K&rft.au=Singh%2C+S+K&rft.aulast=Singh&rft.atitle=Influence+of+Cropping+Systems+on+Macrophomina+phaseolina+Populations+in+Soil&rft.title=Plant+Disease&rft.issn=0191-2917&rft.date=1990&rft.volume=74&rft.pages=812-814&rft.issue=10&rft.genre=article