Development models of the ecological agricultures based on utilizing excrements from piggeries

Raising pigs massively is a way of producing specialization and the development trend of agriculture industrialization managing.If the excrements from piggery can't be handled appropriately and used fully,the environment will be damaged seriously.There are a lot of the biological energy and the nutriments,such as NH3,P2O5,K2O and so on,in the excrements.Development of the ecological agricultures ofAgriculture-Forestry-Fisheryby making full use of the outputs in the methane-generating pits through the fermentation of excrements from piggery not only can promote the countryside economy,increase the peasant's income,but also can protect the ecological environment.The modes of production,the rules of operation,the structures of system and benefits of ecological agriculture based on utilizing the excrements from the small,medium and large piggeries have been analyzed separately.The results in research show that the governments must enhance the management for the excrements from piggeries and formulate the preferential policies for development of the ecological agriculture,and that pig-raising families must establish social responsibility of saving the resources and protecting the environment in order to promote development of the ecological agricultures.