A 1-m wide ditch in the shape of a cross is dug around and through the field. Both ridged and flat fields are used. Methods are similar to other systems. Farming with fish cultivation. This method is also called the seven layers production of rice fish cultivation .
Sugarcane is grown in the ridges of the field and rice is transplanted into the field.
Wild rice is planted between the rows of rice, and water chestnuts or water hyacinth are cultivated on the water surface. Fisheries engineering is the same as for other methods. Cost benefit analysis of combination-growing with fish culture in Yangmingqin, Rong Chang County. Cost Benefit Analysis of Rice Fish Farming Rice fish farming is an effective way to make full use of ricefield resources and to cultivate freshwater fish. It also fully uses the productive potential of water in the ricefields.