?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=P&rft.au=Kumar%2C+P&rft.aulast=Kumar&rft.isbn=92-9066-418-5&rft.date=2000&rft.title=Total+factor+productivity+of+rice-wheat+cropping+systems+in+India+-+the+role+of+legumes&rft.btitle=Legumes+in+rice+and+wheat+cropping+systems+of+the+Indo-Gangetic+Plain+-+constraints+and+opportunities&rft.genre=bookitem