Domestication method of nostoc and application thereof

Abstract

The invention discloses a domestication method of nostoc and application thereof. The domestication method comprises the following steps of: preparing a specific culture medium; carrying out salt tolerance domestication, nitrogen and phosphorus content reduction domestication, domestication of adaptability to water to be treated, and the like on screened nostoc species; carrying out step-by-step amplification culture; then leading the nostoc species into a saline and alkaline land, wherein the nostoc is propagated in large quantities by utilizing photosynthesis and absorbs and fixes nitrogen and phosphorus elements contained in atmosphere and water sources; and after the nostoc is propagated, draining culture water for the nostoc, wherein the nostoc is deposited in soil and contains a large quantity of elements, i.e. nitrogen, phosphorus, and the like. After primary treatment is carried out by using the domestication method, the nitrogen contained in the soil is increased by 18-21 percent, the phosphorus is increased by 12-14 percent, and full salt content is reduced by 15-18 percent, therefore not only is nutrient element loss caused by a water washing method prevented, but also the hardening of the soil and the secondary pollution to the water sources and environments, which are caused by chemical fertilizer application, are prevented; and in addition, soil fertility is gradually enhanced and soil restoration is accelerated through multi-time treatment, therefore the purpose of improving an ecological environment is finally achieved.

Description

technical field [0001] The invention discloses a method for improving saline-alkali land and increasing soil fertility by using nitrogen-fixing blue-green algae, in particular to a method for treating saline-alkali land by using Nostoc algae. Background technique [0002] Saline-alkali lands are widely distributed around the world, covering more than 30 countries on six continents. It is mainly distributed in India, Pakistan, Russia, South Africa and other countries, with a total area of ​​about 956 million hectares. Among them, India and Pakistan have 8.09 million hectares, and Russia has 7.5 million hectares. The area of ​​saline-alkali land in the western United States accounts for about half of the irrigated area, and the output of saline-alkali is reduced by more than 25% every year. Land salinization is an important part of land desertification, which seriously threatens the local agricultural and animal husbandry production, the prosperity and development of the nat...

AI Technical Summary

Problems solved by technology

) Among the existing main methods for controlling saline-alkali land, the water washing and salt discharge adopted by the physical method are likely to cause the loss of soil nutrients, and require large material and financial resources, while the fertilization or acid-base balance adopted by the chemical method is likely to cause soil compaction and Excessive governance costs

Although physical and chemical methods can temporarily change the salinity of the soil, they cannot essentially change the soil fertility of the original saline-alkali land.

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