The construction of shrimp ponds can be built in places with sufficient water resources. The suitable water depth is1-1.5m. The bottom of the pond should be flat and have good seepage control effect. Rectangular, east-west, generally 1-3 mu is appropriate. Clean the pond thoroughly. Before stocking, shrimp seedlings should be cleaned and disinfected with quicklime or bleaching powder, which is conducive to killing loaches, frogs and wild fish. There are many other factors that need to be paid attention to in raising green shrimp. For example, they will shell regularly. Don't take the shell out at this time. They will eat by themselves because there is a lot of calcium in the shell. Shrimp can be full twice a day, but don't feed too much, or too much residue will destroy the nutrients in the water. Finally, remember to change the water regularly to keep the air content in the water.
Spray mirex evenly in the ditch at night, and then bury underground cages on the shore. You can catch the crayfish that climbed into the cage and fainted the next morning. Although this method can catch shrimp, it is particularly toxic to crayfish, and it will faint or even die directly. At the same time, whether it is brewed with clear water or cooked, the residual toxins in the body cannot be completely removed. Therefore, it is best to use less to avoid poisoning after eating.
How to use Impatiens balsamina. Control cotton pests. Helicoverpa armigera is sprayed before the incubation period of eggs and before larvae invade cotton boll buds. Spraying 25-50ml per mu, the dosage is 20% yuan. This concentration can also be used to effectively control the harm of pink bollworm in the peak incubation period. At the same time, it can also control pests such as red spider, small bridge worm, Jin Gangzuan, leaf roller, thrips and scale insects. Cotton aphid uses 20% EC 10-25ml per mu, and it should be increased when the aphid quantity is large.