An agricultural tri-cyclic mode for Yangtze River Delta plain and water regions

Based on the concept of recycling economy and local conditions, an agricultural tri-cyclic mode was built for the Yangtze River Delta plain and water regions. The mode integratively coordinated agricultural, environmental and social benefits. After systematic analysis of the present agricultural conditions and design of the mode, the mode was updated to an advanced stage. The study introduced the main technical parameters and changes required for the mode structure design. The tri-cyclic mode was a recycling agricultural mode consisted of three interconnected circle-like layers with the urban as the center. The three circle-like layers were layers of urban-rural connection area, plantation-cultivation-manufactures and scale agriculture. In the urban-rural connections layer, the main technologies were rotation technology of rice in paddy field and melon/vegetable in dry land, and pollution-free cultivation technology of rice, melon and vegetable. In the second layer, sericulture, nursery, cash forest and aquatic-animal husbandry formed the circulation mode of plantation-cultivation-manufactures. In the third layer, where was far from the city, high quality-high yield grain, oil and vegetable production was the main industries. Based on the study, the agricultural tri-cyclic mode showed great prospects for the Yangtze River Delta plain and water regions. It was estimated that more than 3 billion tons of sewage in the rural areas of the Yangtze River Delta region were absorbable by garden land-paddy wetland systems in a year, which greatly alleviated environmental load of water in the region. The mode assembled and integrated techniques of land decentralization of animal manure, agro-straw utilization, earthworm compost, producing obvious economic, environmental and social benefits. The mode performance was perfect, which was sufficient evidence of academic and practical application. The mode well performance was also of significance for its application and popularization.