@incollection{icrisat3470,
          editor = {C Johansen and J M Duxbury and S M Virmani and C L L Gowda and S Pande and P K Joshi},
       booktitle = {Legumes in rice and wheat cropping systems of the Indo-Gangetic Plain - constraints and opportunities},
           title = {Total factor productivity of rice-wheat cropping systems in India - the role of legumes},
       publisher = {International Crops Research Institute for the Semi-Arid Tropics},
         address = {Patancheru, Andhra Pradesh, India},
          author = {P Kumar and P K Joshi and C Johansen and M Asokan},
           pages = {166--175},
            year = {2000},
             url = {http://oar.icrisat.org/3470/},
        abstract = {During the past three decades, the rice-wheat cropping systems (RWCS)
in India significantly contributed to enhancing food grain production and
achieving food self-sufficiency and food security. The production system
now is under threat due to stagnating or declining total factor
productivity. Legumes can play a significant role in enhancing the factor
productivity of this most important and productive production system in
the country. Ironically, rice and wheat have replaced the principal
legumes over a period of time. With the availability of high-yielding and
short-duration varieties of important legumes, there is a need to
incorporate them in RWCS to improve the sustainability of the system so
as to meet future food grain demands without degradation of the natural
resource base.}
}