000			01224nam a22002777a 4500
999			_c5655 _d5655
001			GENERAL-000752
003			EC-OLADE-CDD
005			20161115164542.0
008			160705b xxu||||| |||| 00| 0 spa d
040			_aOLADE-CDD _cOLADE-CDD
041			_aeng
082			_a333.953 _bI249 / 1976
100			_aKrummel, John
245			_aThe resource costs of agricultural production
260			_aChicago: _bInstitute of Gas Technology, _c1976
300			_app. 359-370
500			_aImpreso. El artículo es parte de: Clean fuels from biomass, sewage, urban refuse, agricultural wastes: symposium papers.
504			_a06104
505			_aThe resource inputs of energy, land and labor are analyzed for various food production systems. U.S. type intensive agriculture relies on large amounts of fossil fuel, fertilizer, and machinery to obtain high food yields. The ratio of the kilocalorie return of food energy to the total energy input is relatively low, ranging from 0.65 to 2.52 for the intensive crop production systems discussed...
650			_aAgricultura
650			_aAspectos Económicos
650			_aEnergía
650			_aCongresos y Conferencias
651			_aEstados Unidos
942			_2ddc _cMON