?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=P&rft.au=Singh%2C+P&rft.aulast=Singh&rft.date=2001&rft.title=Productivity+and+Resource+Use+Management+of+Soybean-based+Systems+in+a+Vertic+Inceptisol+Watershed&rft.genre=proceeding