关键词: 烟叶, 烟叶, 钾, 农艺性状, 烟碱

Abstract: Cycling agriculture plays important role in modern agricultural development for the energy crisis and environment pollution.In this article we take the big hoggery-biogas eco-economy system in Nanhanji village, Zhoukoudian town,Fangshan district for a case study, and using the method of energy, emergy and modern economy assessment, the eco-economy system is comprehensively Evaluated. The quantitatively analysis and evaluation result will offer scientific basis for the further development of Beijing cycling agriculture. The result showed that ① from energy point, after cycling, the total energy output efficiency is 1.77 and the total energy input economy efficiency is 87%, greatly increased than the single subsystem.②from emergy point, after cycling, the net emergy yield ratio is 38.04, less than the sub-hoggery system and make the sub-biogas system from negative to positive. This proved that cycling benefits of the agricultural system increased greatly.③from economy point, after cycling, the FIRR(Financial Internal Rate of Return)is 26.8%, more than ic(10%),and the FNPV(Financial Net Present Value) is 261.0wanyuan,this is >0, simultaneity the Pt(Investment return term)is 3nian,all this showed that the economy benefit of the cycling eco-economy system is feasible and continuable.