Energy analysis of sugar beet production in Greece (Tsatsarelis,1992)
as revised by Ecological Engineering Laboratory FEA-Unicamp, SP, Brasil. March 10, 1999
  Mass   Energy Energy  
  Flow units per sequestred Flow %
  quantity year hectare Mj/unit Mj/aha  
           
I = Nature contribution       42784 15.00
R = Renewable resources          
rain 5000000.0 kg/y ha 0.005 24700 8.66
N = Non renewable resources          
soil loss 20000.0 kg/y ha 0.904 18084 6.34
           
F = Economy Inputs       242490 85.00
M = Material inputs       114815 40.25
seeds 3.0 kg/y ha 12.8 38 0.01
irrigation water 1600000.0 kg/y ha 0.005 7904 2.77
phosphate fertlizer 100.0 kg/y ha 13.7 1370 0.48
nitrogenous fertilizer 132.0 kg/y ha 74.2 9794 3.43
potassium fertilizer 0.0 kg/y ha 9.7 0 0.00
herbicides 11.3 kg/y ha 418.0 4703 1.65
inseticides 11.0 kg/y ha 363.6 4000 1.40
fungicides 18.0 kg/y ha 99.0 1782 0.62
machinery 66.9 kg/y ha 142.7 9544 3.35
fuel 1600.0 kg/y ha 47.3 75680 26.53
S = services       127675 44.76
labor 158.0 hours/y ha 450.0 71100 24.92
management 1.1 hours/y ha 2250.0 2475 0.87
public services (taxes) 170.5 dollars/y ha 200.0 34100 11.95
investment (payments & return) 100.0 dollars/y ha 200.0 20000 7.01
Total       285273 100.00

Production          
Energy content (roots) 2.5 Mj/kg      
Sugar beet roots 61100 kg /year ha      
Beet tops (recycled) 40000 kg /year ha      
Total Biomass 101100 kg /year ha      

Energy diagnosis          
Input 285273 Mj / y ha      
Output 153972 Mj / y ha      
Produtivity 0.21 kg / Mj Mass production/Energy input    
Intensity 4.67 M / kg Energy input/Mass production    
Eficiency 0.54   Energy output/Energy input    


Enrique Ortega ortega@fea.unicamp.br
Ricardo H. da Silva ricampeq97@hotmail.com
Laboratorio de Engenharia Ecológica e Informática Aplicada
FEA - Unicamp, Caixa Postal 6121, 13083-970 Campinas - SP - Brasil
Telefone: +55 (19) 788 40 58 (under repairs), Fax: +55 (19) 289 15 13
Internet: http://www.unicamp.br/fea/ortega/homepage.htm