Method for cultivation of fish in carbonate type heavy saline-alkali rice field

Abstract

The present invention relates to a carbonate type heavy saline rice field fish-breeding method, which includes: adopting filed-steeping and washing method to reduce alkali and salt, improving design standard of fish channel and adopting the channel whose cross-section is in the form of trapezoid, controlling water layer by five stages, raising water level at proper time, scientific application of fertilizer, reasonable transplanting and breeding fishes at proper times. Besides, adopting feed-supplementing method to raise growth of fishes. Said invention can reduce pH value of said heavy saline rice field to below 8.82, can obtain commercial fishes and can raise yield or rice.

Description

technical field [0001] The invention belongs to planting and fish breeding in agricultural technology, and relates to a method for cultivating fish in paddy fields, in particular to the fish breeding technology in paddy fields of carbonate-type severe saline-alkali land. Background technique [0002] The arable land in the world includes various types of saline-alkali land. China alone has about 99 million hectares of saline-alkali land resources, mainly distributed in China's "three north" and coastal areas. According to the salt content of the soil, it can be divided into chloride type, sulfate type and carbonate type; according to the salt content, it can be divided into mild, moderate and severe saline-alkali soil. One of the main ways to develop and utilize these saline-alkali land resources in agriculture is to grow rice, but it is currently limited to mild and moderate saline-alkali lands, and large areas of severe saline-alkali lands have not been utilized. [0003]...

AI Technical Summary

Problems solved by technology

Although fish farming in rice fields has a history of more than 2,000 years, fish farming in rice fields in saline-alkali land, especially in severely saline-alkali land, is still rare.