01303naa a2200289 a 450000100080000000500110000800800410001910000200006024500600008026000090014052005850014965000190073465000120075365000240076565000200078965000120080965000130082165000220083465000100085665300120086665300210087865300130089965300120091265300150092470000170093977300570095616174611995-06-27       1978    bl uuuu     u00u1 u    #d1 aSILVA, J. G. da  aEnergy balance for ethyl alcohol production from crops.  c1978  aEnergy requirements to produce ethyl alcohol from three different crops in Brazil (sugarcane, cassava, and sweet sorghum) were calculated. Figures are presented for the agricultural and industrial phases. The industrial phase is always more energy-intensive, consuming from 60 to 75 percent of the total energy. Sugarcane is the more efficient crop for ethyl alcohol production, followed by sweet sorghum stems might increase the total energy gain from this crop to almost the same level as sugarcane. Cassava has a lower energy gain at the present state of agriculture in Brazil.  aenergy balance  aÁlcool  aBalanço de Energia  aBiocombustível  aEnxerto  aMandioca  aManihot Esculenta  aSorgo  aAlcohol  aCana-de-açúcar  aEnxertia  aSorghum  aSugar cane1 aSERRA, G. E.  tScience, Madisongv. 201, n. 4350, p. 903-908, 1978.