Depending on the size of the field, one or two horizontal ditches are dug to connect all the ditches and improve the flow of water. This increases the volume of water for the fish and improves the capacity of the field to store water. Wide ditch around the field. 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.