TY  - BOOK
AU  - Krummel, John
TI  - The resource costs of agricultural production
U1  - 333.953 
PY  - 1976///
CY  - Chicago
PB  - Institute of Gas Technology
KW  - Agricultura
KW  - Aspectos Económicos
KW  - Energía
KW  - Congresos y Conferencias
KW  - Estados Unidos
N1  - Impreso. El artículo es parte de: Clean fuels from biomass, sewage, urban refuse, agricultural wastes: symposium papers; 06104; The 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
ER  -