notes Agricultural Energetics (by Richard C. Fluck and C. Direlle Baird)
Agriculture industry geting energy from the sun and produce caloric energy. Energy cannot be created or destroyed - only converted. Conversion of electical energy to mechanical - usually has most efficiency. Fluorescent lamps have more efficiency than incandescent lamps. *but LED win!now Food is not only sun energy, but also oil, gas, coil - because of energy while development(and growing) agro system. Natural ecosystems run on solar energy. Incoming solar energy - solar constant 1.395 * 10^-3 MJ m^-2*s^-1 After calc without darkness, clouds - beetween 0.09 to 0.29 30% - directly reflected, 47% - converted to heat - only 0.02% for photosyntesis. Energy from plants -> Animal muscle energy. Man need - ~10.46 MJ. Possible to calc from where and how much energy man is getting. The Agriculture society next from the hunting society. Old agro societies - energy from the sun, labor people and animals. In industrial societies - sun and mostly oil energy. *Energy efficiency of society, E...