一、鱼—桑—鸡：塘内养鱼，塘四周种桑树，桑园内养鸡。使桑、鱼、鸡形成良好的生态循环。试验表明：每５００千克桑叶喂蚕，蚕粪喂鱼，可增加鱼产量２５千克，桑园内养鸡２０只，年产鸡粪１２００千克，相当于给桑园施氮肥１８千克、磷肥１７－５千克。二、鸡—猪：用饲料喂 First, the fish - Mulberry - chicken: Tong fish ponds around the pond mulberry, mulberry chicken. Sang, fish, chicken form a good ecological cycle. Experiments show that: every 500 kilograms of mulberry silkworm feeding, silkworm manure can increase fish production 25 kilograms, mulberry 20 chickens, with an annual output of 1200 kg of chicken manure, which is equivalent to the mulberry 18 kg of nitrogen fertilizer, phosphate fertilizer 17 -5 kg. Second, chicken - pig: fed with feed