Acid soil conditioner containing chitosan oligosaccharide and application

Abstract

The invention belongs to the field of soil improvements, and relates to application of soil conditioner containing chitosan oligosaccharide to acid soil conditioning. The conditioner is prepared from 0.05-100 parts of chitosan oligosaccharide, 0-80 parts of soil improvement components, 0-15 parts of artificially synthesized high-molecular compounds and 0-100 parts of mineral substances. The soil improvement components are one or more of lime, plant ash, dolomite, coal ash, slaked lime, calcium carbonate, powdered rock phosphate, ammonium carbonate, lime nitrogen and the like in alkaline substances. The artificially synthesized high-molecular compounds are obtained by mixing one or more of polyacrylic acid type high-molecular compounds, vinyl acetate maleic acid type high-molecular compounds and polyvinyl alcohol high-molecular compounds. The mineral substances are obtained by mixing one or more of peat, brown coal, decomposed coal, vermiculite, bentonite, zeolite, perlite and sepiolite. When applied, the soil conditioner is uniformly sprayed or atomized on the surface of acid soil, and the acid soil is uniformized through deep tillage arrangement or rotary tillage; or, the soil conditioner is used for topdressing; in the application method, the application amount of the soil conditioner ranges from 50 kg/hm<2> to 1000 kg/hm<2>, the soil conditioner is applied 1-3 times, the pH value of soil can be promoted to rise, the soil acidity can be lowered, or soil can be neutral.

Description

technical field [0001] The invention belongs to the field of soil improvement, and relates to the application of a chitosan-containing oligosaccharide and its composition in acidic soil conditioning. Background technique [0002] Due to the influence of planting patterns, fertilization, climate and other factors, there are currently about 200 million hectares of acidic soil in China. Most acidic soils have a pH of less than 5.5, and some are even lower. Due to years of continuous cropping and excessive application of chemical fertilizers in some orchards and protected vegetable protection areas, the phenomenon of soil acidification is becoming more and more serious, which has become a major limiting factor for the safe production and sustainable development of fruits. Soil acidification leads to deterioration of soil structure, reduction of cation exchange capacity and base saturation, serious loss of soil nutrients, and poor soil ridges, which affect the normal growth of p...

AI Technical Summary

Problems solved by technology

Although the above improvers can neutralize the acidity of the soil to a certain extent, and the raw materials are relatively sufficient, there are also some shortcomings. The simple application of quicklime can only kill various pathogenic bacteria and parasite eggs, etc., and cannot remove heavy metals and toxic substances. The poisoning of organic substances; if the application of dolomite needs to consume valuable mineral resources, it will also increase the cost of agricultural production; industrial wastes such as phosphate rock powder contain a certain amount of toxic metal elements, such as containing a small amount of lead (Pb), cadmium ( Cd), mercury (Hg), arsenic (As), chromium (Cr); fly ash also contains a small amount of lead (Pb), cadmium (Cd), arsenic (As), chromium (Cr)

Although the content is very small, there is still a risk of polluting the environment for long-term application; the use of industrial waste such as fly ash, alkali slag or urban sludge contains pathogenic bacteria, parasite eggs, and heavy metals such as Ni, Cd, Pb and polysaccharides. Refractory toxic organic substances such as chlorinated biphenyls and dioxins have a high content of soluble salts, which are toxic to plants and microorganisms

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