In Table 3, what was the human energy “subsidy” to the lawn ecosystem, that is,
ID: 3020175 • Letter: I
Question
In Table 3, what was the human energy “subsidy” to the lawn ecosystem, that is, how many kcal/lawn/year of direct human input (as labor) were there? How does this compare to the kcal “subsidy” of fertilizer and gasoline for the lawn mower?
Labor male
Labor female
3h 50 min
3h 30 min
0.356 kcal/kg per 10 min
0.356 kcal/kg per 10 min
532.2
249.2
Labor male
Manure
Chemical fertilizer
27.5 min
10.7 kg
3.63 kg
0.564 kcal/kg per 10 min
79.70 kcal/lb
1,382.15 kcal.lb
100.8
1,800.9
11,0572.2
Labor Male
Gasoline
4h 58 min
4.73 liters
0.979 kcal/kg per 10 min
36,225 kcal/gal
1,983.9
45,281.3
Labor Male
Seed
6.5 min
326.6 g
0.564 kcal/kg per 10 min
1,800 kcal/lb
23.8
1,293.7
Task Total time energy factor kcal/yr Raking (labor) 7h 26 min 0.686 kcal/kg per 10 min 1988.7 IrrigationLabor male
Labor female
3h 50 min
3h 30 min
0.356 kcal/kg per 10 min
0.356 kcal/kg per 10 min
532.2
249.2
H20 (source lawn) 340.82 m^3 413.1 kcal/m^2 140,792.7 FertilizingLabor male
Manure
Chemical fertilizer
27.5 min
10.7 kg
3.63 kg
0.564 kcal/kg per 10 min
79.70 kcal/lb
1,382.15 kcal.lb
100.8
1,800.9
11,0572.2
Lawn MowingLabor Male
Gasoline
4h 58 min
4.73 liters
0.979 kcal/kg per 10 min
36,225 kcal/gal
1,983.9
45,281.3
ReseedingLabor Male
Seed
6.5 min
326.6 g
0.564 kcal/kg per 10 min
1,800 kcal/lb
23.8
1,293.7
Miscellaneous labor 16 min 0.686 kcal/kg per min 71.3 Total 205,175.7Explanation / Answer
what was the human energy “subsidy” to the lawn ecosystem, that is, how many kcal/lawn/year of direct human input (as labor) were there
1988.7
How does this compare to the kcal “subsidy” of fertilizer and gasoline for the lawn mower?
100.8 +45,281.3 = 45382.1
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