“Four in one” means building a biogas digester underground at the end of the current vegetable plastic greenhouse, building a pig house on the ground, integrating “greenhouse-biogas-pig-vegetable” in one, and making full use of “three marshes” to realize harmless production. Ecological agriculture model.

Based on the principle of eco-economics, it uses system engineering methods, uses land resources as the foundation, uses solar energy as the driving force, and uses biogas as the link. Through biomass energy conversion technology, it integrates the “four digits” into one, enabling cultivation techniques and breeding techniques. , Anaerobic fermentation technology, solar energy utilization technology in the solar greenhouse to achieve organic integration, mutual interaction, interdependence, and more complementary to form a comprehensive system of rural energy utilization. It makes the energy in the agro-ecosystem form a multi-level utilization and a virtuous circle of matter, and achieves the goals of high yield, high quality, high efficiency, and low consumption. It is an environment-friendly production that simultaneously produces gas and fertilizer, grows and breeds in the same place. The mechanism is an energy ecosystem project with many biological populations, a sound food chain structure, and rapid energy flow and logistics.

It creates good environmental conditions for the vegetable fields, pig houses and digesters through the solar greenhouses. The manure will enter the pool to produce biogas, purify the environment of the pig house, feed the biogas slurry and biogas residues to the pigs, and provide organic fertilizers without insects for the vegetable fields. Reducing the occurrence of pests and diseases, reducing the use of chemical fertilizers, pesticides, and feed, and producing pollution-free products; pigs and vegetables exchange CO2 and O2, and biogas can be burned to increase temperature, enhance sunlight, increase CO2, and provide energy for farmers to manage greenhouses. It can significantly improve and improve the production and quality of live pigs and vegetables, eliminate pollution, and promote the growth process.

This model can save energy, reduce costs, improve economic efficiency, make full use of space, make full use of labor resources, shorten planting time, prosper markets, develop economy, improve farmers' quality, realize multi-industry combination, intensive management, and achieve agricultural production. The requirement of less input, more output, higher efficiency, and no pollution is an important technical measure for realizing the sustainable development of agriculture.

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