CN104893741A - Soil conditioner as well as preparation method and application of soil conditioner - Google Patents

Abstract

The invention discloses a mildly-saline-alkali soil conditioner as well as a preparation method and application of the mildly-saline-alkali soil conditioner, wherein the soil conditioner comprises the following components in parts by weight: 60-70 parts of calcium salt, 15-20 parts of biomass cokes, 5-8 parts of a biomass water solution and 5-10 parts of an organic fertilizer. The soil conditioner can be used for rapidly and effectively solving various problems such as high soil alkalization degree, low fertility, high soil pH value and soil agglomeration, and is low in price and low in heavy metal content.

Description

Soil improvement conditioner and its preparation method and application

technical field

The present invention relates to the field of agriculture, in particular to a soil improvement conditioner and its preparation method and application, more specifically to a soil improvement conditioner, a method for preparing the soil improvement conditioner and a method for improving mildly salinized soil.

Background technique

There are large areas of saline-alkali land distributed in our country, and the degree of salinization is expanding. The salinization of land not only causes a large amount of agricultural production reduction in our country, but also causes a lot of losses. Due to the increasingly serious degree of salinization, large areas of land have gradually become wasteland. Transforming saline-alkali land and improving the agricultural production of saline-alkali cultivated land is one of the important tasks of agricultural development in my country.

The improvement of saline-alkali land in my country has a long history, and a variety of improvement methods and technologies have been developed. The agronomic or engineering technology methods involved can be mainly divided into: physical improvement (such as land leveling, deep plowing and sunning, terrace field improvement, etc.), water conservancy improvement ( Such as irrigation and drainage, washing and research, salt drainage in hidden pipes, etc.), chemical improvement (such as application of gypsum, phosphogypsum, humic acid, etc.), and biological improvement (such as planting of salt-tolerant plants, microbial improvement, etc.). These improved technologies all have certain effects, but also have certain deficiencies. For example, washing salt with fresh water can reduce the salinity of the soil, but the effect on reducing the alkalinity is not significant, and the water consumption is large, which may easily cause the loss of mineral elements necessary for plant growth. Biological improvement has poor universality, slow effect and relatively high cost.

The research and development of soil conditioner is the core of chemical improvement technology. Chinese patent application CN101624523 discloses "a kind of saline-alkali improver", which is prepared by mixing aluminum sulfate, ferrous ammonium sulfate and magnesium sulfate according to different weight ratios. It needs a large amount of chemical raw materials to make the improver, instead of using Industrial waste is expensive. Chinese patent application CN1377936A discloses "Using waste gypsum board to produce saline-alkali soil improver method and its product and application", which uses calcium sulfate in gypsum to replace exchangeable sodium in soil, but waste gypsum board needs to be processed and broken to Used to improve soil. If the particle size of the improver after crushing is large, it is not conducive to the ion exchange reaction, and the improvement effect is poor; if the particle size of the improver after crushing is small, it will consume a lot of energy, making the cost of soil improvement too high for farmers to bear. Patent CN201110124738.5 discloses "composition for improving saline-alkali soil with power plant waste, peat, and weathered coal resources" using a mixture of power plant waste such as desulfurized gypsum and fly ash and weathered coal resources as a modifier. The high content of heavy metals in soil will cause the heavy metals and harmful trace elements in the improved soil to exceed the allowable value of the national standard. Some patents, such as CN03111936.0, CN200910117619.X, etc., involve complex formulations of improver components.

Therefore, the current soil conditioner needs to be further studied.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to propose a kind of soil improver with good universality of biological improvement, quick effect, low price, and low heavy metal content, which is suitable for the improvement of saline-alkali soil, especially for Improvement of mildly salinized soils.

According to one aspect of the present invention, the present invention provides a soil improvement conditioner. According to an embodiment of the present invention, the soil improvement conditioner includes: 60-70 parts by weight of calcium salt, 15-20 parts by weight of biomass coke, 5-8 parts by weight of biomass aqueous solution and 5-10 parts by weight of organic fertilizer.

According to the embodiments of the present invention, the soil improvement conditioner of the present invention can quickly and effectively improve various problems such as high degree of alkalization of the soil, low fertility, high soil pH value and soil agglomeration. Moreover, the price of the soil improving conditioner is low, the content of organic matter is high, and the content of heavy metals is low.

According to another aspect of the present invention, the present invention provides a method for preparing a soil improvement conditioner. According to an embodiment of the present invention, the method includes: mixing biomass organic matter and calcium salt to obtain a first mixture; and heat-treating the first mixture to obtain a heat-treated solid product and a heat-treated liquid product, wherein the The heat-treated solid product includes: biomass coke and calcium salt; the heat-treated liquid product is subjected to static stratification and the water phase is separated, and the water phase constitutes the biomass aqueous solution; organic fertilizers are added to the heat-treated solid product, performing a first stirring treatment to obtain a second mixture; and adding the aqueous biomass solution to the second mixture and performing a second stirring treatment to obtain the soil improvement conditioner.

According to the embodiment of the present invention, using the method of the present invention, the calcium salt and the biomass organic matter are mixed and then heat-treated directly, without crushing and pretreatment of the biomass organic matter, which simplifies the production process and can also increase the yield of coke. Moreover, the calcium salt is heated to release water, and after being condensed and recovered, the yield of the heat-treated liquid product obtained by collecting is also increased. At the same time, the method of the invention has simple production process and low production cost, and the prepared soil improvement conditioner has high organic content and low heavy metal content, and can quickly and effectively enhance soil fertility.

According to still another aspect of the present invention, the present invention provides a method for improving mildly salinized soil. According to an embodiment of the present invention, the method applies the aforementioned soil improvement conditioner to the mildly salinized soil.

According to the embodiments of the present invention, the soil improvement conditioner of the present invention can be used to quickly and effectively improve mild salinized soil. The soil improvement conditioner can effectively reduce the alkalinity of the soil, enhance the fertility of the soil, reduce the pH value, and improve the aggregate structure of the soil.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 shows a flow chart of preparing a soil improvement conditioner according to one embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Soil Improvement Conditioner

According to one aspect of the present invention, the present invention provides a soil improvement conditioner. According to an embodiment of the present invention, the soil improvement conditioner includes: 60-70 parts by weight of calcium salt, 15-20 parts by weight of biomass coke, 5-8 parts by weight of biomass aqueous solution and 5-10 parts by weight of organic fertilizer.

According to an embodiment of the present invention, the calcium ion (Ca ²⁺ ) in the calcium salt of the present invention can carry out ion exchange with the substitutable sodium ion on the soil colloid, so that the sodium ion enters the soil solution from the soil colloid and then goes under the irrigation water. Seepage or discharge through drainage channels, thereby reducing the alkalinity of the soil and improving the aggregate structure of the soil. According to the embodiment of the present invention, the biomass coke of the present invention is a porous carbon-rich polymer, which is slightly alkaline, can absorb and fix the salt ions and water in the soil, maintain soil moisture, and provide a place for the reproduction of soil microorganisms , while blocking capillary channels to a certain extent, reducing the salinity of soil particles, improving soil structure and particle aggregation characteristics of saline-alkali soil. According to the embodiments of the present invention, the biomass aqueous solution contains a large amount of acetic acid, propionic acid, acetone, etc., which can increase the organic matter content of the soil, combine with organic bacterial fertilizer, increase soil fertility, provide nutrients for crop growth, and reduce the pH of alkaline soil value to improve the alkalization of the soil. Therefore, the soil improving conditioner of the present invention can improve various problems of the soil, and the soil improving agent can effectively reduce the alkalization degree of the soil, enhance the fertility of the soil, reduce the pH value of the soil, and improve the aggregate structure of the soil. In addition, the soil improvement conditioner has low price, high organic matter content and low heavy metal content, and can quickly and effectively enhance soil fertility.

According to a specific embodiment of the present invention, biomass coke and biomass aqueous solution are obtained through the following steps: mixing biomass organic matter with calcium salt to obtain a first mixture; subjecting the first mixture to heat treatment to obtain a heat-treated solid product and The heat-treated liquid product, wherein the heat-treated solid product includes: biomass coke and calcium salt; the heat-treated liquid product is subjected to static layering and the water phase is separated, and the water phase constitutes an aqueous solution of biomass. The inventor surprisingly found that after mixing the calcium salt and the biomass organic matter, heat treatment is performed directly, and the heat treatment of the biomass organic matter generates small-volume coke, thereby omitting the process of crushing the biomass organic matter and simplifying the production process. It can also increase the yield of coke, and the calcium salt is heated to release water, and after condensation and recovery, the yield of the biomass aqueous solution obtained by charging is also improved.

Wherein, it should be noted that calcium salts will be dehydrated in the heat treatment process. In the present invention, calcium salts after dehydration and calcium salts without dehydration treatment can be used in the soil improvement conditioner of the present invention, which can improve the condition of soil. The composition of the agent has no effect, and it has no effect on the improvement effect of the soil.

According to a specific embodiment of the present invention, the biomass organic matter is at least one selected from sawdust, wood chips, and crop straw, wherein the crop straw can be agricultural waste such as corn straw, wheat straw, and rice straw. Thus, production waste such as sawdust, sawdust, and crop stalks can be used as raw materials for the soil improvement conditioner, and the production waste can be utilized, and the cost of the soil improvement conditioner is low.

According to some embodiments of the present invention, the calcium salt is desulfurized gypsum. Among them, it should be noted that desulfurization gypsum is a by-product of limestone-gypsum flue gas wet desulfurization process in coal-fired power plants, and the content of active ingredient CaSO ₄ ·2H ₂ O in desulfurization gypsum is 60-92%. Calcium ions (Ca ²⁺ ) in desulfurized gypsum can be exchanged with replaceable sodium ions on the soil colloid, so that the sodium ions enter the soil solution from the soil colloid and then infiltrate with irrigation water or drain away through drainage channels, reducing soil Alkalinity, and improve the aggregate structure of the soil.

According to an embodiment of the present invention, the weight ratio of biomass organic matter to calcium salt is not particularly limited, and the ratio can be adjusted according to the problem of the soil. For example, the alkalinization problem of the soil is serious, and the ratio of calcium salt can be increased. If the proportion is high and the soil lumps are serious, the ratio of biomass organic matter can be provided. Preferably, the weight ratio of biomass organic matter to calcium salt is 0.4-1.1:1. Therefore, the soil improvement conditioner prepared by mixing in this proportion can effectively reduce the degree of soil alkalization and improve the soil structure and the aggregation of soil particles.

According to a particular embodiment of the invention, the particle size of the calcium salt is at most 50 microns. Therefore, the contact area between the calcium salt and the soil is large, and the ion exchange reaction between the calcium ion and the replaceable sodium ion in the soil is promoted, and the improvement effect on the soil is good.

According to a specific embodiment of the present invention, the heat treatment is baking, dry distillation or pyrolysis. Thus, the coke obtained by the heat treatment and the heat treatment liquid product have a high yield, and the heat treatment effect is good.

According to a specific embodiment of the present invention, the heat treatment is carried out at a temperature of 280-500° C. under an inert atmosphere, wherein the inert atmosphere is flue gas or inert gas. Therefore, the product obtained by heat treatment is not easy to be oxidized, and the yield of coke and liquid product of heat treatment is high, and the effect of heat treatment is good.

According to a specific embodiment of the present invention, the pH value of the biomass aqueous solution is less than 7, which can directly reduce the pH value of the alkaline earth. Moreover, the biomass aqueous solution can also contain a large amount of acetic acid, propionic acid, acetone, etc., and the soil improvement conditioner has a high content of organic matter. Combined with organic bacterial fertilizer, it is beneficial to increase soil fertility and provide nutrients for crop growth.

According to some embodiments of the present invention, the organic fertilizer is a fertilizer fermented with probiotic flora, that is, a fertilizer obtained by adding probiotic flora to commercially available organic fertilizers for fermentation. Therefore, the organic fertilizer contains a large amount of fermentation products of probiotic flora, and the organic fertilizer has high fertility.

According to a specific embodiment of the present invention, the probiotic group is at least one selected from halophilic bacteria, lactic acid bacteria, acetic acid bacteria, yeast and photosynthetic bacteria. Therefore, the fermentation effect of the probiotic group is good, the organic fertilizer contains a large amount of beneficial fermentation products, and the organic fertilizer has high fertility.

Method for preparing soil improvement conditioner

According to another aspect of the present invention, the present invention provides a method for preparing a soil improvement conditioner. Referring to Fig. 1, the method for preparing the soil improvement conditioner is described in detail.

S100: Hybrid

According to an embodiment of the present invention, the biomass organic matter and the calcium salt are mixed to obtain the first mixture. Thus, the biomass organic matter and the calcium salt are evenly mixed, the pyrolysis reaction is promoted, and the yield of coke and biomass aqueous solution is improved.

According to a specific embodiment of the present invention, the biomass organic matter is at least one selected from sawdust, wood chips, and crop straw, wherein the crop straw can be agricultural waste such as corn straw, wheat straw, and rice straw. Thus, production waste such as sawdust, sawdust, and crop stalks can be used as raw materials for the soil improvement conditioner, and the produced waste can be utilized, and the cost of the soil improvement conditioner is low.

According to some embodiments of the present invention, the calcium salt is desulfurized gypsum. Among them, it should be noted that desulfurization gypsum is a by-product of limestone-gypsum flue gas wet desulfurization process in coal-fired power plants, and the content of active ingredient CaSO ₄ ·2H2O in desulfurization gypsum is 60-92%. Calcium ions (Ca ²⁺ ) in desulfurized gypsum can be exchanged with replaceable sodium ions on the soil colloid, so that the sodium ions enter the soil solution from the soil colloid and then infiltrate with irrigation water or drain away through drainage channels, reducing soil Alkalinity, and improve the aggregate structure of the soil.

According to some embodiments of the present invention, the weight ratio of biomass organic matter to calcium salt is not particularly limited, and the ratio can be adjusted according to the problem of the soil. For example, the alkalinization problem of the soil is serious, and the ratio of calcium salt can be increased. If the salinity is high and the soil lumps are serious, the ratio of biomass organic matter can be provided. Preferably, the weight ratio of biomass organic matter to calcium salt is 0.4-1.1:1. Therefore, the soil improvement conditioner prepared by mixing in this proportion can effectively reduce the degree of soil alkalization and improve the soil structure and the aggregation of soil particles.

S200: heat treatment

The first mixture is heat-treated to obtain a heat-treated solid product and a heat-treated liquid product, wherein the heat-treated solid product includes: biomass coke and calcium salt. The inventors have surprisingly found that the first mixture is subjected to heat treatment, and the biomass organic matter generates small-volume coke, thereby omitting the process of crushing and pretreating the biomass organic matter, simplifying the production process, and improving the yield of coke , and the calcium salt is heated to release water, and after condensation and recovery, the yield of the heat-treated liquid product obtained by charging is also improved.

Wherein, it should be noted that calcium salts will be dehydrated in the heat treatment process. In the present invention, calcium salts after dehydration and calcium salts without dehydration treatment can be used in the soil improvement conditioner of the present invention, which can improve the condition of soil. The composition of the agent has no effect, and it has no effect on the improvement effect of the soil.

According to a particular embodiment of the invention, the particle size of the calcium salt is at most 50 microns. Therefore, the contact area between the calcium salt and the soil is large, and the ion exchange reaction between the calcium ion and the replaceable sodium ion in the soil is promoted, and the improvement effect on the soil is good.

According to a specific embodiment of the present invention, the heat treatment is baking, dry distillation or pyrolysis. Thus, the yield of coke and biomass aqueous solution obtained by heat treatment is high, and the effect of heat treatment is good.

According to a specific embodiment of the present invention, the heat treatment is carried out at a temperature of 280-500° C. under an inert atmosphere, wherein the inert atmosphere is flue gas or inert gas. Therefore, the product obtained by heat treatment is not easy to be oxidized, and the yield of coke and biomass aqueous solution is high, and the effect of heat treatment is good.

S300: static layering

The heat-treated liquid product is allowed to stand for stratification and the water phase is separated, and the water phase constitutes an aqueous solution of biomass. Thus, the volatile products in the heat treatment process will form heat-treated liquid products after being condensed and recovered. This part of the heat-treated liquid products will form two layers after standing still, one is water-insoluble tar, and the other is tar containing a large amount of water-soluble organic matter. Water phase, this layer of water phase containing water-soluble organic matter constitutes the biomass aqueous solution. The biomass aqueous solution contains a large amount of acetic acid, propionic acid, acetone, etc., which can increase the organic matter content of the soil, combine with organic bacterial fertilizer, increase soil fertility, and provide nutrients for crop growth.

According to a specific embodiment of the present invention, the pH value of the biomass aqueous solution is less than 7 and is acidic, which can directly reduce the pH value of alkaline soil and improve the alkalization of the soil.

S400: first stirring treatment

The organic fertilizer is added to the heat-treated solid product, and the first stirring treatment is performed to obtain the second mixture. Therefore, the organic fertilizer contains a large amount of organic matter, and the fertility of the soil improvement conditioner can be increased by adding the organic fertilizer.

According to some embodiments of the present invention, the organic fertilizer is a fertilizer fermented by probiotic flora. Therefore, the organic fertilizer contains a large amount of fermentation products of probiotic flora, and the organic fertilizer has high fertility.

According to a specific embodiment of the present invention, the probiotic group is at least one selected from halophilic bacteria, lactic acid bacteria, acetic acid bacteria, yeast and photosynthetic bacteria. Therefore, the fermentation effect of the probiotic group is good, the organic fertilizer contains a large amount of beneficial fermentation products, and the organic fertilizer has high fertility.

According to an embodiment of the present invention, the weight ratio of the heat-treated solid product to the organic fertilizer is not particularly limited, and can be appropriately adjusted according to the soil to be improved. If the content of salt ions in the soil is high, the ratio of the heat-treated solid product can be increased. If If the fertility of the soil is poor, the proportion of the organic fertilizer can be increased. Preferably, the weight ratio of the heat-treated solid product to the organic fertilizer is 6-14:1. Therefore, the soil improvement conditioner prepared by mixing in this proportion can effectively reduce the salt content in the soil and enhance the fertility of the soil.

S500: Second stirring treatment

The biomass aqueous solution is added to the second mixture, and the second stirring treatment is performed to obtain a soil improvement conditioner. Since the addition amount of the biomass aqueous solution is small, after the first stirring, the biomass aqueous solution is added to the second mixture, so that the biomass aqueous solution and the second mixture can be mixed more uniformly.

According to a specific embodiment of the present invention, the weight ratio of the second mixture to the biomass aqueous solution is 11-19:1. Therefore, the soil improvement conditioner has a good improvement effect on the soil, can effectively reduce the alkalization degree of the soil, enhance the fertility of the soil, reduce the pH value of the soil, and improve the aggregate structure of the soil.

Methods of improving mildly salinized soil

According to still another aspect of the present invention, the present invention provides a method for improving mildly salinized soil. According to an embodiment of the present invention, the method applies the aforementioned soil improvement conditioner to mildly salinized soil.

According to the embodiments of the present invention, the soil improvement conditioner of the present invention can be used to quickly and effectively improve mild salinized soil. The soil improvement conditioner can effectively reduce the alkalinity of the soil, enhance the fertility of the soil, reduce the pH value, and improve the aggregate structure of the soil.

According to some embodiments of the present invention, the application rate of the soil improvement conditioner is 1500-2500 kg/mu. According to the embodiment of the present invention, if the application rate is lower than the application amount, the addition amount of the soil improvement conditioner is too small, and the calcium ion is insufficient to carry out the replacement reaction with the sodium ion in the soil colloid, and the pH value of the soil cannot be adjusted to a reasonable level. Moreover, the improvement effect on soil fertility is not obvious. If it is higher than the implementation amount, the addition amount of the soil improvement conditioner is too much, which may cause soil acidification, and the fertility of the soil is too high, which is not conducive to the growth of plants.

According to a specific embodiment of the present invention, the pH value of the mildly salinized soil is 8-10, the degree of alkalization is 5-15%, and the salt content is <0.6%. Therefore, the soil improvement conditioner has a good improvement effect on the soil, can significantly improve the alkalization degree of the soil, enhance the fertility of the soil, reduce the pH value of the soil, and improve the aggregate structure of the soil.

The present invention will be described below with reference to specific embodiments. It should be noted that these embodiments are only illustrative and should not be construed as limiting the present invention.

Example 1

Utilize the method of the present invention, prepare a kind of improved conditioning agent, concrete steps are as follows:

(1) Stir and mix 80g of desulfurized gypsum and 50g of pine wood sawdust, put them into a fixed reaction vessel, the front of the fixed reaction vessel is connected to a nitrogen tank, and the rear is connected to a casing condenser;

(2) Continuously feed a small amount of nitrogen into the fixed reaction vessel, heat the fixed reaction vessel to 450° C. and keep it for 1 hour, and the gas product is passed into the sleeve condenser to condense and recover the liquid product;

(3) After the reactor is cooled to room temperature, collect the solid product and stir and mix it with 5g of organic fertilizer. After the liquid product is allowed to stand for stratification, filter to obtain the water phase product. Get 5g and spray it into the mixture of the solid product and the organic fertilizer. Stir evenly to obtain an improved conditioner, the ingredients of which are: 70g of desulfurized gypsum, 20g of biomass coke, 5g of biomass aqueous solution and 5g of organic bacterial fertilizer.

Use the above-mentioned improved conditioner to treat mild saline-alkaline soil. The pH of the soil to be improved is 8.5, the degree of alkalinity is 8%, and the salt content is 0.3%. The application rate of the improved conditioner is 1500 kg/mu. After the improvement, the pH of the soil is reduced to about 7.5, and the degree of alkalization is reduced to below 5%. One application can continue to be effective for many years, and there is no need for repeated application for improvement within 5-8 years.

Example 2

Utilize the method of the present invention, prepare a kind of improved conditioning agent, concrete steps are as follows:

(1) Stir and mix 70g of desulfurized gypsum and 40g of corn stalks, and put them into a fixed reaction vessel, the front of the fixed reaction vessel is connected to a nitrogen tank, and the rear is connected to a sleeve condenser;

(2) Continuously feed a small amount of nitrogen into the fixed reaction vessel, heat the fixed reaction vessel to 300° C. and keep it for 1 hour, and the gas product is passed into the sleeve condenser to condense and recover the liquid product;

(3) After the reactor is cooled to room temperature, collect the solid product, simply crush it and mix it with 7g of organic fertilizer. The bacterial fertilizer mixture is stirred evenly to obtain an improved conditioner, and its ingredients are: 65g of desulfurized gypsum, 20g of biomass coke, 8g of biomass aqueous solution and 7g of organic bacterial fertilizer.

Use the above-mentioned improved conditioner to treat mild saline-alkaline soil. The pH of the soil to be improved is 9, the degree of alkalization is 15%, the salt content is 0.5%, and the application rate of the improved conditioner is 2500 kg/mu. After the improvement, the pH of the soil is reduced to about 7.8, and the degree of alkalization is reduced to below 5%. One-time application can continue to be effective for many years, and there is no need to repeat application for improvement within 5-8 years.

Example 3

Utilize the method of the present invention, prepare a kind of improved conditioning agent, concrete steps are as follows:

(1) Stir and mix 65g of desulfurized gypsum and 40g of poplar wood sawdust, put them into a fixed reaction vessel, the front of the fixed reaction vessel is connected to a nitrogen tank, and the rear is connected to a sleeve condenser;

(2) Continuously feed a small amount of nitrogen into the fixed reaction vessel, heat the fixed reaction vessel to 450° C. and keep it for 1 hour, and the gas product is passed into the sleeve condenser to condense and recover the liquid product;

(3) After the reactor is cooled to room temperature, collect the solid product and stir and mix it with 10g of organic fertilizer. After the liquid product is allowed to stand for stratification, filter to obtain the water phase product. Get 7g and spray it into the mixture of the solid product and the organic fertilizer. Stir evenly to obtain an improved conditioner, the ingredients of which are: 60g of desulfurized gypsum, 15g of biomass coke, 7g of biomass aqueous solution and 10g of organic bacterial fertilizer.

Use the above-mentioned improved conditioner to treat mild saline-alkaline soil. The pH of the soil to be improved is 8.5, the degree of alkalization is 10%, and the salt content is 0.3%. The application rate of the improved conditioner is 2000 kg/mu. After the improvement, the pH of the soil is reduced to below 7.5, and the degree of alkalization is reduced to below 5%. One-time application can continue to be effective for many years, and there is no need to repeat application for improvement within 5-8 years.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. a soil improvement amendment, is characterized in that, comprising:

The calcium salt of 60-70 weight part, the biomass coke of 15-20 weight part, the biomass water solution of 5-8 weight part and the organic chemical fertilizer of 5-10 weight part.

2. soil improvement amendment according to claim 1, is characterized in that, described biomass coke and described biomass water solution are obtained by following steps:

Biomass organism is mixed with calcium salt, to obtain the first mixture;

Heat-treated by described first mixture, to obtain thermal treatment solid product and thermal treatment liquid product, wherein, described thermal treatment solid product comprises: described biomass coke and described calcium salt; And

Described thermal treatment liquid product is carried out stratification and water phase separated, and described aqueous phase forms described biomass water solution.

3. soil improvement amendment according to claim 2, is characterized in that, described biomass organism is at least one being selected from sawdust, wood chip and agricultural crop straw,

Optionally, described calcium salt is desulfurated plaster,

Optionally, the weight ratio of described biomass organism and described calcium salt is 0.4-1.1:1,

Optionally, the particle diameter of described calcium salt is 50 microns at the most,

Optionally, described thermal treatment for curing, destructive distillation or pyrolysis,

Optionally, described thermal treatment is 280-500 DEG C in temperature, carries out under the condition of inert atmosphere,

Optionally, the pH value of described biomass water solution is less than 7.

4. soil improvement amendment according to claim 1, is characterized in that, described organic chemical fertilizer is beneficial flora fermentation chemical fertilizer,

Optionally, described beneficial flora be selected from addicted to salt alkali bacillus, milk-acid bacteria, acetic bacteria, yeast and photosynthetic bacteria one of at least.

5. prepare a method for soil improvement amendment, it is characterized in that, comprising:

Biomass organism is mixed with calcium salt, to obtain the first mixture;

Heat-treated by described first mixture, to obtain thermal treatment solid product and thermal treatment liquid product, wherein, described thermal treatment solid product comprises: biomass coke and described calcium salt;

Described thermal treatment liquid product is carried out stratification and water phase separated, and described aqueous phase forms described biomass water solution;

In described thermal treatment solid product, add organic chemical fertilizer, carry out the first stir process, to obtain the second mixture; And

In described second mixture, add described biomass water solution, carry out the second stir process, to obtain described soil improvement amendment.

6. method according to claim 5, is characterized in that, described biomass organism is at least one being selected from sawdust, wood chip and agricultural crop straw,

Optionally, described calcium salt is desulfurated plaster,

Optionally, the particle diameter of described calcium salt is 50 microns at the most,

Optionally, the weight ratio of described biomass organism and described calcium salt is 0.4-1.1:1,

Optionally, described thermal treatment for curing, destructive distillation or pyrolysis,

Optionally, described thermal treatment is 280-500 DEG C in temperature, carries out under the condition of inert atmosphere.

7. method according to claim 5, is characterized in that, described organic chemical fertilizer is beneficial flora fermentation chemical fertilizer,

Optionally, described beneficial flora be selected from addicted to salt alkali bacillus, milk-acid bacteria, acetic bacteria, yeast and photosynthetic bacteria one of at least,

Optionally, the weight ratio of described thermal treatment solid product and described organic chemical fertilizer is 6-14:1.

8. method according to claim 5, is characterized in that, described biomass water solution ph is less than 7,

Optionally, the weight ratio of described second mixture and described biomass water solution is 11-19:1.

9. improve a method for slight salinized soil, it is characterized in that, soil improvement amendment described in any one of claim 1-4 is used to described slight salinized soil.

10. method according to claim 9, is characterized in that, the amount of application of described soil improvement amendment is 1500-2500kg/ mu,

Optionally, the pH value 8-10 of described slight salinized soil, basicity 5-15%, saltiness < 0.6%.