A microbial agent for converting soil invalid phosphorus into available phosphorus, its preparation method and application

Abstract

The invention discloses a microbial agent capable of converting unavailable phosphorus into available phosphorus in soil, and a preparation method and applications thereof. The preparation method comprises the following steps of: (1) sampling soil from water-covered paddy field, keeping out of the sun under the anaerobic environment of ORP smaller than or equal to minus 300mV and continuously adding a culture medium for culturing, enriching a mixed bacteria strain with phosphine production capability; and (2) mixing a microbial agent with paddy field soil, then evenly mixing the mixture with an alkaline phosphatase-producing bacterial strain, and drying to obtain the microbial agent. The application situations of unavailable phosphorus in low-productive soil can be improved by applying the functional complex microbial inoculants, the number of specific microorganisms in the soil can be increased, the microecological conditions of the soil can be improved, the content of available phosphorus in the soil and the utilization rate of plant to the soil phosphorous can be increased, and the production and quality of crops can be increased.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to a microbial method capable of converting soil invalid phosphorus into available phosphorus. Background technique [0002] Soil is an extremely important material basis for human survival and development, and phosphorus is one of the most important elements in soil. At present, 74% of the cultivated land in my country is deficient in phosphorus, and most of the phosphorus contained in the soil itself is in an invalid state, but the phosphorus needed to promote plant growth is mainly soluble phosphate. Due to the influence of soil acidity, the fixation of phosphorus fertilizer and the low availability of plants, the absorption rate of phosphorus fertilizer by crops in the current season is only 10%-30% when tracer phosphorus fertilizer is used. [0003] Due to the lack of formulated fertilization, in order to obtain high yields, vegetable farmers use excessive amounts of nitrogen and ...

AI Technical Summary

Problems solved by technology

[0003] Due to the lack of formulated fertilization, in order to obtain high yields, vegetable farmers use excessive amounts of nitrogen and phosphorus fertilizers, which eventually lead to a large amount of phosphorus enrichment in the soil

More than 95% of the phosphorus enriched in the soil is invalid phosphorus, which will not only cause unnecessary waste, but also affect the absorption of other nutrients by plants

At the same time, excessive phosphorus will affect the pH of the soil, which in turn will affect the microorganisms in the soil.

In addition, a large amount of phosphorus enrichment in the soil will also lead to an increase in the phosphorus content of the water body, which will pollute the water body and cause eutrophication of the water body and damage the ecological environment.

Since the 1980s, vegetable greenhouses have been vigorously developed, and due to their weak rainwater leaching, the utilization rate of phosphorus has further declined

However, due to the uneven application of bacterial agents and other reasons, the distribution of available phosphorus in the soil that can be used by plants is not uniform, and the absorption and utilization of plants are partially limited.

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