info:oai:icrisat:3470info:ofi/fmt:xml:xsd:bookKumarPKumar, PJoshiP KJoshi, P KJohansenCJohansen, CAsokanMAsokan, M92-9066-418-52000Total factor productivity of rice-wheat cropping systems in India - the role of legumesLegumes in rice and wheat cropping systems of the Indo-Gangetic Plain - constraints and opportunitiesbookitem