Preparation method of modified acid soil conditioner

Abstract

The invention relates to a preparation method of a modified acid soil conditioner. Firstly, compound biochar is prepared through organic manure and straw, then no-full ammonia activation is conductedto modify the raw material, and furthermore, calcium-magnesia phosphate and optimized microbial preparation are mixed to obtain the conditioner. By adopting combination of the specific kinds and specific dosages of the soybean straw and the rape straw, the cost is low, the utilization rate is high, and the effect is good; the manure, humic acid and the straw are matched with one another to preparethe organic compound biohar, and the obtained compound biochar is more efficient. By means of the soil conditioner, the capacity of neutralizing the pH value in the soil is improved, the conditionercan improve the pH value by 1-2, the soil organic matter content is improved, exchangeable aluminium is reduced, cadmium is reduced, and the soil permeability and the water retaining capacity are improved, so that granular structure forming and stabilization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of treating acidic soil, and in particular relates to a preparation method of an improved acidic soil conditioner and an acidic soil conditioner prepared by the method. Background technique [0002] With the rapid development of modern industry, acid rain, excessive and improper fertilization have caused increasingly severe soil acidification. Soil acidification is one of the manifestations of soil degradation, resulting in a large loss of calcium, magnesium, and phosphorus in the soil, and a decline in soil fertility. The area of ​​acidic soil in China accounts for about 21% of the country's cultivated land. Over-acidic soil has poor soil structure and compaction, cracks in the soil layer when dry, poor water permeability when wet, and seriously affects the physical and chemical properties of the soil. The pH value is low, and the range of variation is between 4.5 and 6.1. The acidic soil of 5.5 is in the ...

AI Technical Summary

Problems solved by technology

Over-acidic soil has poor soil structure and compaction, cracks in the soil layer when dry, poor water permeability when wet, and seriously affects the physical and chemical properties of the soil. The pH value is low, and the range of variation is between 4.5 and 6.1. The acidic soil of 5.5 is in the majority, organic matter content is low, aluminum toxicity is big, and cadmium pollution is prominent; Now also have a lot of improvers for acidic soil, play an important role; CN107254312A discloses a kind of mixture biochar and its compound for improving acidic soil The preparation method, although the manure particles and the straw are mixed and carbonized, but no humic acid is added, and the straw is not finely classified and utilized, nor is it properly activated by ammonia, nor is it used in conjunction with subsequent microbial preparations

CN106635030 A only carbonizes the straw, and the degree of cracking and activation is not strong; Zhang Ming and others have studied the effect of different straws on the acidic soil of the vineyard, but only distinguish the characteristics and improvement effects of different straws

At present, most of the amendments generally have defects such as single function, large application amount, poor effect, short time effect, compound acid, etc. Extensive use of nitrogen fertilizer is also one of the important reasons for the aggravation of soil acidification

When the soil is acidic or severely acidified, it will have a serious impact on crop growth

Although some organic materials such as crop stalks, decomposed or fermented animal manure are used to improve acidic soil, the utilization rate is not high, and the role of raw materials cannot be better played and the advantages are highlighted; there are also calcium magnesium phosphate fertilizers, although they are alkaline in nature. And soil acidity, but because it does not work better with other ingredients, it also makes it unable to play a better role; long-term application of lime will also lead to re-acidification process, which will aggravate soil acidification

In order to improve the efficiency of nitrogen fertilizer use, dicyandiamide is usually added to the acidic soil conditioner to inhibit the nitrification of ammonium nitrogen, thereby reducing the loss of ammonium nitrogen into nitrate nitrogen, but dicyandiamide is a chemical substance with low toxicity and pollution and hazards; in the prior art, some ammonia gas is passed into the biochar preparation process for activation. Although the alkaline components are increased to a certain extent, it actually also promotes nitrification

At present, it is not uncommon to use straw to improve acidic soil, such as rape straw, rice straw, corn straw, soybean straw, peanut straw and broad bean straw.

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