00537naa a2200157 a 450000100080000000500110000800800410001910000140006024501380007426000090021270000170022170000160023870000180025470000160027277300910028818396352010-01-10       1989    bl ---       0--  u    #d1 aSINGH, S.  aEnergy and cost requirements for cultivation of rice (Oryza sativa)- wheat (Triticum aestivum) and maize (Zea mays)-wheat rortations.  c19891 aSINGH, M. P.1 aRANA, R. S.1 aMITTAL, V. K.1 aBAKHSHI, R.  tIndian Journal of Agricultural Science, New Delhigv. 59, n. 9, p. 558-560, sep. 1989.