Rice-shrimp culture ecological circulating planting and breeding method

Abstract

Provided is a rice-shrimp culture ecological circulating planting and breeding method. The planting and breeding method includes the steps that an annular shrimp trench is excavated around a rice field, the trench is 3-5 m wide and 1.2-1.5 m deep, the area of the annular shrimp trench is 15-20% of the total area of the rice field, the transparency of water in the annular shrimp trench is kept at 28-32 cm, and the dissolved oxygen of the water in the annular shrimp trench is 5-10 mg / L; and waterweeds, hydrilla varticillata and tape grass aquatic plants are planted in the annular shrimp trench, the water level in the trench in March is controlled to be 28-32 cm, after the middle ten days of April, the water level is gradually increased to 50-60 cm, after the middle ten days of May, the rice field is exposed out of the water surface for cultivation, the water level of the rice field from October to November is controlled to be 18-22 cm, and the water level of the rice field from December to February of the next year is controlled to be 40-50 cm. The method has the advantages that rice and shrimps are cultured in the same rice field, the growth conditions of rice are reasonably improved, growth of procambarus clarkia is promoted, and the goal of double harvesting of rice and shrimps is achieved.

Description

technical field [0001] The invention relates to the field of ecological agricultural aquatic species cultivation, in particular to a method for cultivating rice and shrimp in an ecological cycle. Background technique [0002] my country is not only the world's largest user of chemical fertilizers, but also the largest user of pesticides. At present, the annual usage is about 1.3 million tons. In some high-yielding rice areas, pesticides are used more than 30 times a year, and the amount used per hectare is as high as 300kg, and some even exceed 450kg. The problem of excessive use and low utilization rate (about 30%) is very serious. According to a study by the Chinese Academy of Agricultural Sciences, the excessive use of pesticides in my country accounts for 40% of rice production. For a long time, due to the extensive use of pesticides in the rice production process, it has posed a great threat to the safety of rice production. The use of a large number of agricultural c...

AI Technical Summary

Problems solved by technology

Extensive use of chemical fertilizers and pesticides will also cause soil compaction and deterioration of soil physical and chemical properties.