Technical measures of rice-fish rotation

Before making preparations, we must first raise and strengthen the ridges of the fields. Combined with the seedling or whole field of early rice, the ridge of the field should be heightened and widened as the basis of the later stage. After the harvest of early rice and the return of late rice, the ridge should be raised to more than 1.5 meters in time, and the width of the ridge should be about 1.2 meters. Secondly, it is necessary to do a good job in temporary recuperation ponds. The temporary pond is excavated in a corner of Honda, with an area of 15% to 20% of the size of rice fields. The depth of the temporary pond is about 1 meter. Finally, the drainage ditch was opened at a convenient end of the field to prevent the flood from rushing into the pond, causing the fish to escape with the water. Fish pond drain should be built to block fish unprepared, fish blocking equipment is generally nailed on the wooden frame with nylon net.

If you breed silver carp, silver carp and grass carp, the weight of each fish should reach 200,000,300 grams, because the smaller size will affect the edible value. Can put silver carp, bighead carp, grass, green, common carp, carp and other fish, not only can be mixed culture, but also can be monoculture, stocking specification is 0.8 inch. The mixed culture density should be determined according to the depth of the pool, the size of the pool, and the level of management. General fish species per mu is 8000 million; monoculture Nile tilapia should put 3000 million; silver carp, common carp, bighead carp, grass, green and other mixed culture, about 300 per mu. The proportion of mixed culture is 50% for silver carp, 10% for silver carp, 20% for grass carp, 15% for carp and 5% for carp.

Rotation of fish ponds, especially to strengthen management, fertilization method is: early rice harvest grain ears, leaving straw in the field to submerge and rot as base fertilizer. During the fish culture cycle, all kinds of green manure and manure are applied to fertilize the pond water to tea-brown or yellowish green. Green manure is applied 2-3 times a month, 250-300 kg per mu, and the amount of manure depends on the color of the water. The way to feed is to crush all kinds of leftovers and wheat bran into powder and feed them 1 kilogram twice a day, 1 kilogram per ten thousand fish in the early stage and about 3 kilograms in the later stage. The number of grass carps raised alone should be doubled according to the above number. Where there are conditions, feeding duckweed is the most effective way to increase the yield of grass and mackerel. be careful not to fill the whole pond when throwing duckweed, otherwise the fish will die from lack of oxygen. In addition, fish ponds should also pay attention to the removal of weeds. When fish are raised in rice fields, the depth of the water is limited, and there is a lot of mud in the fields, so it is easy to grow all kinds of aquatic plants, and the fish cannot be fully utilized at the moment, which affects the clarity of the water in the pond. therefore, it must be pulled out and piled up in a corner to be used as fertilizer, otherwise it will affect the growth of fish fry. Fish culture in rice fields should also pay attention to the prevention and control of fish diseases, and the method is to do a good job in feeding and enhance the disease resistance of fish. Quicklime can also be applied 2 times 3 times a month, 15 kilograms per mu. In this way, it can not only prevent and cure fish diseases, but also improve water quality, enhance the fecundity of plankton, promote the healthy growth of fish fry, and win a good harvest of fish.