Energy and nutrient analyses of a dairy farm in Central Pennsylvania

摘要: Abstract This paper analyses energy flows on a dairy farm in Central Pennsylvania, U.S.A. Energy values for all inputs to the agricultural system are calculated and evaluated with respect alfalfa, corn milk production. An evaluation of nitrogen phosphorus demonstrates impact that use inorganic fertilizers has total budget system. The recycling nutrients via application animal manures provides both source fertilizer significant savings terms costs necessary produce similar quantity nutrients. efficiencies appeared be higher than previous studies reported literature. input—output analysis is introduced as an effective technique tracing direct indirect within interdependency corn, production management demonstrated this required fuels electricity, goods, solar calculated.