Rice-field crab farming refers to the use of shallow water environments in rice fields, supplemented by man-made measures to grow rice and raise crabs, and achieve the goal of double-increasing rice and river crabs. In recent years, all parts of the country, from north to south, have used rice fields to raise crab species and crabs, all of which have been initially successful and have shown broad development prospects. In 1994, the Ministry of Agriculture issued the “Harvest Plan†project to Liaoning Province. It was confirmed that crab cultivation in rice fields not only did not reduce rice production, but also increased crab production and greatly increased the income of farmers in the rice-producing areas. This technology is currently being promoted nationwide as a “harvest plan†project.
The ecological role of crabs in paddy fields: Crab raising in paddy fields is a new type of farming method that organically combines planting and aquaculture. It promotes the advantages of lake crabs and ponds for crabs, and overcomes the shortcomings of the two methods. With rice and the ecological significance of mutual benefit.
(1) The crabs remove weeds from paddy fields and reduce the weeding process in rice. After crabs are cultivated in rice paddies, labor for manual weed removal is not only eliminated, but also the incommensurability of weed control and herbicides that cannot be matched by manual weed control. Sex, in particular, can save costs and reduce environmental pollution. The weeds in paddy fields are generally feed for crabs, such as Azolla, Ceratophyllum, Vallisneria, and watermills.
(2) The river crab removes pests from rice fields and reduces the cost of insecticides for growing rice. Tests have shown that river crabs can eliminate pests on stems, leaves and ears of rice. This may be due to the fact that the pests on the leaf stems have started to fall into the water and become a delicious meal for crabs. Therefore, crabs in rice fields have a biological control effect, which can effectively reduce the harm of insect pests to rice and greatly reduce the investment and labor of pesticide application.
(3) Crab crawling and ingestion of benthic animals can play a role in loosening the mud, which can reduce the labor of farmland cultivating: Some aquatic organisms in the paddy field live in shallow mud, and some live on the mud surface. The behavior of the crab during feeding can objectively make the soil soft and aeration, which is conducive to the decomposition of the Fertilizer and the permeability of the soil, thereby promoting the development of the rice bran tillers and roots.
(4) The crab plays a role in maintaining rice growth and fertilizing rice. The crabs ingest aquatic plants and benthic animals. The growth of these organisms consumes fertilizer nutrients in paddy fields in different degrees, and thus reduces the consumption of fertilizers. To the role of fertilizer conservation. Fertilization refers to the excrement of river crab is rich in nitrogen, phosphorus, calcium and other nutrients, is a high-quality fertilizer in rice fields.
(5) Rice paddy rice paddies can provide a good ecological environment for the growth of river crabs. In general, the paddy fields have soft soil, adequate dissolved oxygen, suitable water temperature, adequate nutrient salts, and soft soil to facilitate the activities of river crabs.
(6) Paddy rice fields can provide abundant food organisms for the growth of river crabs: According to research, the vast majority of aquatic organisms are fodder feeding foods, and these feed animals and plants are all able to better meet the river crab's flora and fauna. Different needs of bait.
The ecological role of crabs in paddy fields: Crab raising in paddy fields is a new type of farming method that organically combines planting and aquaculture. It promotes the advantages of lake crabs and ponds for crabs, and overcomes the shortcomings of the two methods. With rice and the ecological significance of mutual benefit.
(1) The crabs remove weeds from paddy fields and reduce the weeding process in rice. After crabs are cultivated in rice paddies, labor for manual weed removal is not only eliminated, but also the incommensurability of weed control and herbicides that cannot be matched by manual weed control. Sex, in particular, can save costs and reduce environmental pollution. The weeds in paddy fields are generally feed for crabs, such as Azolla, Ceratophyllum, Vallisneria, and watermills.
(2) The river crab removes pests from rice fields and reduces the cost of insecticides for growing rice. Tests have shown that river crabs can eliminate pests on stems, leaves and ears of rice. This may be due to the fact that the pests on the leaf stems have started to fall into the water and become a delicious meal for crabs. Therefore, crabs in rice fields have a biological control effect, which can effectively reduce the harm of insect pests to rice and greatly reduce the investment and labor of pesticide application.
(3) Crab crawling and ingestion of benthic animals can play a role in loosening the mud, which can reduce the labor of farmland cultivating: Some aquatic organisms in the paddy field live in shallow mud, and some live on the mud surface. The behavior of the crab during feeding can objectively make the soil soft and aeration, which is conducive to the decomposition of the Fertilizer and the permeability of the soil, thereby promoting the development of the rice bran tillers and roots.
(4) The crab plays a role in maintaining rice growth and fertilizing rice. The crabs ingest aquatic plants and benthic animals. The growth of these organisms consumes fertilizer nutrients in paddy fields in different degrees, and thus reduces the consumption of fertilizers. To the role of fertilizer conservation. Fertilization refers to the excrement of river crab is rich in nitrogen, phosphorus, calcium and other nutrients, is a high-quality fertilizer in rice fields.
(5) Rice paddy rice paddies can provide a good ecological environment for the growth of river crabs. In general, the paddy fields have soft soil, adequate dissolved oxygen, suitable water temperature, adequate nutrient salts, and soft soil to facilitate the activities of river crabs.
(6) Paddy rice fields can provide abundant food organisms for the growth of river crabs: According to research, the vast majority of aquatic organisms are fodder feeding foods, and these feed animals and plants are all able to better meet the river crab's flora and fauna. Different needs of bait.
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