Soil conditioner as well as preparation method and application thereof

Abstract

The invention provides a soil conditioner as well as a preparation method and application thereof. The soil conditioner is prepared from the following components in parts by weight: 45 to 50 parts of inorganic compound fertilizer, 45 to 50 parts of potassium humate, 70 to 75 parts of wormcast, 20 to 25 parts of water-soluble silicon fertilizer and 0.5 to 1 part of chitosan. The soil conditioner provided by the invention can promote the growth and development of the tobacco leaves in the field, obviously reduce the stem content of the tobacco leaves, increase the yield of the tobacco leaves and increase the output value.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco cultivation, and in particular relates to a soil conditioner and a preparation method and application thereof. Background Art

[0002] The stem content of tobacco leaves refers to the proportion of tobacco stems in tobacco leaves. It is an important technical and economic indicator for evaluating the quality of tobacco leaves. The effective utilization rate of tobacco leaves is directly related to the stem content of tobacco leaves. Usually, tobacco leaves with low stem content have high effective utilization rates, while tobacco leaves with high stem content have relatively low effective utilization rates. The stem content of tobacco leaves directly affects the stem and sheet (leaf) output rates of leaf threshing and redrying, and also affects the quality and economic traits of tobacco leaves. The quality of tobacco leaves determines the production costs and product quality of cigarette factories and leaf threshing and redrying factories. The stem content of tobacco leaves not only has a significant impact on economic traits, but also has a significant correlation with a number of quality indicators. The stem content of tobacco leaves decreases with the increase of leaf position. The stem content is significantly positively correlated with potassium content, significantly positively correlated with water-soluble chlorine, and significantly negatively correlated with nicotine content. The stem content of tobacco leaves also has a negative effect on some indicators of sensory evaluation. As the stem content of tobacco leaves decreases, the impurities are significantly reduced, the irritation is smaller, the dryness is reduced, and the strength is significantly increased. However, studies by some scholars have shown that the lower the stem content of tobacco leaves, the better. Too low a stem content will cause the tobacco leaves to be broken too much, thus reducing the yield of tobacco leaves.

[0003] The stem content of tobacco leaves is generally considered to be around 25%, with the lowest in the upper leaves, the second highest in the middle leaves, and the highest in the lower leaves. In the late 1980s, the average stem content of tobacco leaves was only about 25%, but with the continuous expansion of the cultivated area and the changes in the cultivation environment and soil environment, the stem content of tobacco leaves in major tobacco-growing areas showed a significant upward trend. By the end of the 2010s, the average stem content of tobacco leaves had reached about 30%, and some areas even exceeded 30%. The stem content of tobacco leaves in various tobacco-growing areas varied greatly, with the stem content difference between different regions reaching up to 8%. Excessively high stem content has had a significant impact on the development of the cigarette industry. The stem content of tobacco leaves has risen by more than 5% in thirty years. Therefore, it is a technical problem that needs to be solved urgently to configure and develop a new type of compound soil conditioner, cooperate with the application of chemical fertilizers, reduce the stem content of tobacco leaves, improve tobacco quality and yield, and regulate the soil environment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a soil conditioner and its preparation method and application. The soil conditioner provided by the present invention can promote the growth and development of tobacco leaves in the field, significantly reduce the stem content of tobacco leaves, increase tobacco leaf yield, and improve output value.

[0005] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a soil conditioner, which comprises, by weight, 45-50 parts of inorganic compound fertilizer, 45-50 parts of potassium humate, 70-75 parts of earthworm castings, 20-25 parts of water-soluble silicon fertilizer and 0.5-1 part of chitosan.

[0007] Among them, the number of portions of inorganic compound fertilizer can be 45 portions, 46 portions, 47 portions, 48 ​​portions, 49 portions or 50 portions, the number of portions of potassium humate can be 45 portions, 46 portions, 47 portions, 48 ​​portions, 49 portions or 50 portions, the number of portions of earthworm manure can be 70 portions, 71 portions, 72 portions, 73 portions, 74 portions or 75 portions, the number of portions of water-soluble silicon fertilizer can be 20 portions, 21 portions, 22 portions, 23 portions, 24 portions or 25 portions, the number of portions of chitosan can be 0.5 portions, 0.6 portions, 0.7 portions, 0.8 portions, 0.9 portions or 1 portions, but are not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are equally applicable.

[0008] Inorganic compound fertilizers have the effects of rooting and strengthening seedlings, salt and alkali resistance, disease resistance and frost resistance; potassium humate has the effects of preventing and controlling plant diseases, enhancing waterlogging resistance, stimulating plant microbial activity, slow-release fertilizer, improving the utilization of chemical fertilizers and pesticides, improving nutrient absorption, promoting plant germination and growth, accelerating precipitation and decomposition, and improving soil structure; earthworm manure can effectively reduce the breeding of pests and diseases; water-soluble silicon fertilizers can regulate crop growth, enhance the robustness of stems, and improve resistance to adversities such as drought, frost damage, pests and diseases, and are not easy to clump and change. It has good quality and stability, and there will be no loss such as infiltration and volatilization, and it has the characteristics of a long fertilizer effect period; chitosan can not only improve the insecticidal and disease-resistant effects of plants, but also decompose animal and plant residues and trace metal elements in the soil, thereby converting them into plant nutrients and promoting plant health; the above-mentioned soil conditioner is a compound of inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan, which work synergistically and can effectively promote the growth and development of tobacco leaves, significantly reduce the stem content of tobacco leaves, increase tobacco yield and improve output value.

[0009] Preferably, the inorganic compound fertilizer includes at least two of calcium fertilizer, magnesium fertilizer or potassium fertilizer.

[0010] Preferably, the effective calcium content in the inorganic compound fertilizer is not less than 25%.

[0011] Preferably, the effective magnesium content in the inorganic compound fertilizer is not less than 12%.

[0012] Preferably, the effective potassium content in the inorganic compound fertilizer is not less than 2%.

[0013] Preferably, the organic matter content in the potassium humate is not less than 60%, and the fulvic acid content is not less than 35%.

[0014] Preferably, the content of active ingredients in the water-soluble silicon fertilizer is not less than 50%.

[0015] The effective ingredient content in the above-mentioned water-soluble silicon fertilizer refers to the silicon content in the water-soluble silicon fertilizer calculated in the form equivalent to silicon dioxide.

[0016] Preferably, the soil conditioner further comprises auxiliary materials, and the auxiliary materials include any one or a combination of at least two of wood ash, dolomite powder, gypsum, perlite or bentonite.

[0017] The above auxiliary materials can improve the physical properties of the soil and the soil aggregate structure, further improve the soil environment, and promote the absorption and utilization of fertilizers by tobacco plants.

[0018] Preferably, the auxiliary materials include, by weight, 15-25 parts of wood ash, 5-10 parts of dolomite powder, 10-15 parts of gypsum, 5-10 parts of perlite and 10-20 parts of bentonite.

[0019] The number of parts of wood ash can be 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25 parts, the number of parts of dolomite powder can be 5, 6, 7, 8, 9 or 10 parts, the number of parts of gypsum can be 10, 11, 12, 13, 14 or 15 parts, the number of parts of perlite can be 5, 6, 7, 8, 9 or 10 parts, and the number of parts of bentonite can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 parts, but are not limited to the values ​​listed above, and other values ​​not listed within the above numerical range are equally applicable.

[0020] In a second aspect, the present invention provides a method for preparing the soil conditioner as described above, the preparation method comprising the following steps:

[0021] The inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan are mixed, and the obtained mixture is crushed and sieved to obtain the soil conditioner.

[0022] Preferably, after the pulverizing and screening, the process further comprises mixing auxiliary materials with the mixture and water to form granules.

[0023] In a third aspect, the present invention also provides the use of the soil conditioner as described above in growing tobacco with a low stem content in tobacco leaves.

[0024] Preferably, the soil conditioner is applied together with base fertilizer when used.

[0025] Preferably, the amount of the soil conditioner is 150-300 kg per mu, for example 150 kg, 160 kg, 170 kg, 180 kg, 190 kg, 200 kg, 210 kg, 220 kg, 230 kg, 240 kg, 250 kg, 260 kg, 270 kg, 280 kg, 290 kg or 300 kg, but is not limited to the above-listed values, and other values ​​not listed within the above numerical range are also applicable.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The invention provides a soil conditioner, which can effectively promote the growth and development of tobacco leaves, significantly reduce the stem content of tobacco leaves, increase tobacco leaf yield and improve output value by compounding inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan through synergistic effect. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention, the technical solution of the present invention is further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0029] In the following examples, the inorganic compound fertilizer was purchased from Shandong Akang Agricultural Technology Co., Ltd. (effective calcium content ≥ 25%, effective magnesium content ≥ 12%, sulfur content ≥ 10%);

[0030] Potassium humate was purchased from Qingdao Baiyuan Bioengineering Co., Ltd., China (small molecular organic matter ≥ 60%, fulvic acid ≥ 35%);

[0031] Vermicompost was purchased from Huaian Songyu Agricultural Technology Co., Ltd.;

[0032] Water-soluble silicon fertilizer (SiO2 ≥ 50%) was purchased from Zhengzhou Keyuan Chemical Products Co., Ltd.;

[0033] Chitosan was purchased from Shandong Luhai Lansheng Technology Co., Ltd.

[0034] Example 1

[0035] This embodiment provides a soil conditioner, and the raw materials for preparation are as follows (in parts by weight):

[0036] 50 parts of inorganic compound fertilizer, 50 parts of potassium humate, 70 parts of earthworm castings, 20 parts of water-soluble silicon fertilizer, 1 part of chitosan, 20 parts of wood ash, 10 parts of dolomite powder, 15 parts of gypsum, 10 parts of perlite, and 15 parts of bentonite.

[0037] The preparation method is as follows:

[0038] Inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan are mixed and crushed, and passed through a 60-mesh sieve to obtain a mixture; bentonite is crushed and passed through a 40-mesh sieve, and then evenly mixed with plant ash, dolomite powder, gypsum and perlite to obtain an auxiliary material product, which is then mixed with the mixture, stirred evenly, water is added, and granulated into particles with a diameter within a range of 2-5 mm using a granulator, and the soil conditioner is obtained after drying.

[0039] Example 2

[0040] This embodiment provides a soil conditioner, and the raw materials for preparation are as follows (in parts by weight):

[0041] 45 parts of inorganic compound fertilizer, 45 parts of potassium humate, 75 parts of earthworm castings, 25 parts of water-soluble silicon fertilizer, 0.5 parts of chitosan, 15 parts of wood ash, 5 parts of dolomite powder, 10 parts of gypsum, 5 parts of perlite, and 10 parts of bentonite.

[0042] The preparation method is similar to that of Example 1.

[0043] Example 3

[0044] This embodiment provides a soil conditioner, and the raw materials for preparation are as follows (in parts by weight):

[0045] 47 parts of inorganic compound fertilizer, 48 parts of potassium humate, 72 parts of earthworm castings, 22 parts of water-soluble silicon fertilizer, 0.6 parts of chitosan, 25 parts of wood ash, 7 parts of dolomite powder, 13 parts of gypsum, 8 parts of perlite, and 20 parts of bentonite.

[0046] The preparation method is similar to that of Example 1.

[0047] Example 4

[0048] This embodiment provides a soil conditioner, and the raw materials for preparation are as follows (in parts by weight):

[0049] 50 parts of inorganic compound fertilizer, 50 parts of potassium humate, 70 parts of earthworm castings, 20 parts of water-soluble silicon fertilizer, and 1 part of chitosan.

[0050] The preparation method is as follows:

[0051] The soil conditioner is obtained by mixing and crushing inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan.

[0052] Comparative Example 1

[0053] This comparative example provides a soil conditioner, which is prepared in the same manner as in Example 1 except that inorganic compound fertilizer is not added and the reduced portion is proportionally distributed to potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan.

[0054] Comparative Example 2

[0055] This comparative example provides a soil conditioner, which is consistent with Example 1 except that potassium humate is not added in the preparation raw materials and the reduced part is proportionally distributed to inorganic compound fertilizer, earthworm castings, water-soluble silicon fertilizer and chitosan.

[0056] Comparative Example 3

[0057] This comparative example provides a soil conditioner, which is prepared in the same manner as in Example 1 except that earthworm castings are not added to the raw materials and the reduced portion is proportionally distributed to potassium humate, inorganic compound fertilizer, water-soluble silicon fertilizer and chitosan.

[0058] Comparative Example 4

[0059] This comparative example provides a soil conditioner, which is prepared in the same manner as in Example 1 except that no water-soluble silicon fertilizer is added and the reduced amount is proportionally distributed to potassium humate, earthworm castings, inorganic compound fertilizer and chitosan.

[0060] Comparative Example 5

[0061] This comparative example provides a soil conditioner, which is prepared in the same manner as in Example 1 except that chitosan is not added to the raw materials and the reduced portion is proportionally distributed to potassium humate, earthworm castings, water-soluble silicon fertilizer and inorganic compound fertilizer.

[0062] Effect test:

[0063] The effect of the above soil conditioner was tested, and the test method was as follows:

[0064] 1 Materials and methods

[0065] 1.1 Test location

[0066] Suburban Tobacco Station, Guiyang County, Chenzhou City, Hunan Province.

[0067] 1.2 Test materials

[0068] The test variety was Yunyan 87, and the test was carried out in the form of seedling trays. The test soil type was loess paddy soil. The basic physical and chemical properties of the soil were: organic matter 48.5g / kg, total nitrogen 2.66g / kg, total phosphorus 0.96g / kg, total potassium 10.9g / kg, available phosphorus 39.9mg / kg, available potassium 206.6mg / kg, alkaline nitrogen 188.7mg / kg, and pH 6.5.

[0069] 1.3 Experimental design

[0070] A flat plot was selected for the experiment, with compound soil conditioner treatment and control treatment. A randomized block design was used with three repetitions and a total of six plots. The plots were arranged before ridge formation, with each plot covering an area of ​​0.5 mu (the shape of the plot can be adjusted according to the actual situation, but the area of ​​each plot must be at least 0.2 mu). After the flue-cured tobacco transplanting was completed, the actual number of transplanted plants in each large area was accurately counted, and the spacing between transplanted rows was unified to 1.2m×0.5m. Other production technical measures were consistent with the local ones.

[0071] The experimental groups were divided into an experimental group and a control group (CK). The experimental groups were respectively applied with the soil conditioners provided by Examples 1-4 and Comparative Examples 1-5, and the control group was not applied with any soil conditioner.

[0072] Soil conditioners are applied at the same time as basal fertilizer during the flue-cured tobacco production season. The amount of basal fertilizer (per mu) is: 1,000 kg of fire soil ash, 500 kg of decomposed manure, 30 kg of cake fertilizer, and 60 kg of tobacco-specific basal fertilizer. Application method: About 30 days before applying basal fertilizer in the hole, sprinkle appropriate water according to the amount of basal fertilizer per mu and mix evenly. About 30 days before transplanting, open the tobacco hole to ensure that the tobacco hole is large and deep, and put the basal fertilizer and fire soil ash, and then cover it with a thin layer of soil to mature the basal fertilizer in advance to prevent burning of seedlings during the transplanting period. Soil conditioners are applied by hole application, and the amount of soil conditioners applied is 261 kg / mu. Take more than 10 tobacco plants at each test point to measure the agronomic traits during the dome stage (about 7 days after topping, before the first room of tobacco is harvested and cured). Mainly including plant height, biological leaf number, effective leaf number, stem girth, internode distance, maximum leaf length, maximum leaf width, inverted trifoliate leaf length, and inverted trifoliate leaf width.

[0073] 2 kg of B2F, C3F and X2F tobacco leaf samples were taken from each group for determination of physical indices, conventional chemical composition and sensory quality.

[0074] Agronomic trait terms "dome period, plant height, biological leaf number, effective leaf number, stem girth, internode distance, maximum leaf length, maximum leaf width, inverted trifoliate leaf length, inverted trifoliate leaf width": in accordance with "Tobacco Terminology Part 1: Tobacco Types and Tobacco Leaf Production GB / T18771.1-2015".

[0075] Flue-cured tobacco process: carried out in accordance with the standard "Technical Regulations for Flue-cured Tobacco GB / T 23219-2008".

[0076] In the determination of the physical indices, leaf length, leaf width, single leaf weight, stem content, thickness, leaf weight, and moisture content are determined by pre-processing tobacco leaf samples according to YC / T 31-1996, and the determination methods are as follows:

[0077] (1) Leaf length (cm) and leaf width (cm): Ten tobacco leaves were randomly selected, and the length of each leaf was measured to two decimal places. The results were imported into an Excel table and the average length of the ten leaves was calculated as the length of the sample. The width of each leaf was measured to two decimal places. The results were imported into an Excel table and the average width of the ten leaves was calculated as the width of the sample.

[0078] (2) Single leaf weight (g): Single leaf weight refers to the weight of a leaf. Ten tobacco leaves were randomly selected and weighed after 7 days of moisture balance. The average weight of the ten tobacco leaves was calculated as the single leaf weight of the sample.

[0079] (3) Stem content (%): Ten tobacco leaves were randomly selected and allowed to equilibrate for 7 days. The mesophyll and main vein were separated and the weights of the tobacco leaves and stems were respectively weighed. The stem content was calculated according to the formula: stem content = (weight of 10 tobacco stems / weight of 10 tobacco leaves) × 100%.

[0080] (4) Leaf thickness (mm): 10 tobacco leaves were randomly selected and allowed to equilibrate their moisture content for 7 days. The selected 10 leaves were then processed with a circular punch. Two discs were punched out from each tobacco leaf, avoiding the side veins as much as possible. The total thickness of the 20 discs was measured with a micrometer. The average thickness of the 20 discs was taken as the thickness of the sample.

[0081] (5) Leaf weight (g·cm -2 ): According to the formula: leaf weight (g·cm -2 ) = average disc weight / disc area.

[0082] (6) Moisture content (%): 20 small discs were placed in an oven for drying at 85°C for 6 to 8 hours. When the sample reached a constant weight, it was weighed again. The moisture content of tobacco leaves was calculated according to the following formula: Moisture content of tobacco leaves (%) = (weight of 20 discs - dry weight of 20 discs after drying) / weight of 20 discs × 100%.

[0083] 2 Results

[0084] 2.1 Agronomic traits

[0085] The agronomic traits of flue-cured tobacco at the dome stage after treatment with compound soil conditioners were statistically analyzed (as shown in Table 1), where each index was averaged over ten plants. The agronomic traits of flue-cured tobacco included plant height, plant height, biological leaf number, effective leaf number, stem girth, internode distance, maximum leaf length, maximum leaf width, inverted trifoliate leaf length, and inverted trifoliate leaf width. The measurement methods of these agronomic traits were based on the "Tobacco Agronomic Traits Survey Method YC / T 142-1998"

[0086] The results showed that under the conditions of applying different compound soil conditioners, the agronomic traits of tobacco plants in the field period would be different. The plant height, biological leaf number, stem girth, internode distance, maximum leaf length, maximum leaf width, inverted third leaf length, and inverted third leaf width of T1 (Example 1 group) were all smaller than those of the control, and the effective leaf number of T1 was greater than that of the control.

[0087] Table 1 Agronomic characteristics of flue-cured tobacco at dome stage after application of compound soil conditioner

[0088]

[0089] 2.2 Physical indicators

[0090] The physical indicators of flue-cured tobacco after treatment with compound soil conditioners were statistically analyzed (Table 2). The physical indicators of different leaf positions of flue-cured tobacco treated with compound soil conditioners showed different performances. For the lower leaves, the leaf length, leaf width, single leaf weight, thickness, leaf weight, and water content of T1 were all greater than those of the control, and the stem content of T1 was lower than that of the control. For the middle leaves, the leaf length, leaf width, single leaf weight, and water content of T1 were all greater than those of the control, and the stem content, thickness, and leaf weight of T1 were lower than those of the control. For the upper leaves, the thickness and water content of T1 were greater than those of the control, and the leaf length, single leaf weight, thickness, and water content of T1 were all greater than those of the control, and the leaf width, stem content, and leaf weight of T1 were all less than those of the control. In summary, the application of compound soil conditioners can reduce the stem content of tobacco leaves at different leaf positions to varying degrees.

[0091] Table 2 Physical indicators of flue-cured tobacco after application of compound soil conditioner

[0092]

[0093] 2.3 General chemical composition

[0094] The conventional chemical components of flue-cured tobacco at the dome stage after the compound soil conditioner treatment were statistically analyzed (as shown in Table 3). The conventional chemical components of different leaf positions of flue-cured tobacco treated with the compound soil conditioner showed different performances. For the lower leaves, the potassium content, total nitrogen, and water-soluble chlorine content of T1 were higher than those of the control, while the total sugar, reducing sugar, starch, and nicotine contents were lower than those of the control.

[0095] As for the middle leaves, the total sugar, reducing sugar, starch, potassium content, and water-soluble chlorine content of T1 were higher than those of the control, while the total nitrogen and nicotine contents were lower than those of the control.

[0096] As for the upper leaves, the contents of total sugar, reducing sugar, and starch in T1 were higher than those in the control, while the contents of potassium, total nitrogen, and water-soluble chloride were lower than those in the control, and there was no difference in nicotine content.

[0097] Table 3 Conventional chemical components of flue-cured tobacco treated with compound soil conditioners

[0098]

[0099] 2.4 Sensory quality

[0100] The conventional chemical components of flue-cured tobacco at the dome stage after treatment with compound soil conditioners were statistically analyzed (as shown in Table 4). The sensory qualities of the middle and upper leaves of the flue-cured tobacco treated with compound soil conditioners were different.

[0101] As for the middle leaves, the quality evaluation of T1 was improved compared with the control, among which the total scores of aroma quantity and permeability of miscellaneous aroma were higher than the control, and the style characteristics were also better than the control.

[0102] As for the upper leaves, the total quality evaluation score of T1 is higher than that of the control, and the style characteristic leaves are slightly lower than the control, with greater strength.

[0103] Table 4 Sensory quality of flue-cured tobacco after application of compound soil conditioner

[0104]

[0105]

[0106] 2.5 Economic traits

[0107] The conventional chemical composition of flue-cured tobacco in the dome stage after the compound soil conditioner treatment was statistically analyzed (as shown in Table 6). The economic characteristics of flue-cured tobacco treated with the compound soil conditioner showed different performances. The economic characteristics of T1 were all higher than those of the control, and the yield of T1 reached 181.00 kg / 666.67 m 2 , an increase of 11.76kg / 666.67m compared with the control group 2 The per-acre output value was as high as 6899.72 yuan (per-acre output value = per-acre output × average price. The test tobacco leaves were graded according to the national standard GB2635-92, and the average price was calculated by weighting according to the corresponding purchase prices of different grades), which increased by 736.00 yuan compared with the control. The average price increased by 1.7 yuan / kg, the proportion of high-quality tobacco increased by 3.72%, and the proportion of upper-middle tobacco increased by 1.57%. In summary, the application of compound soil conditioners can increase the proportion of high-quality tobacco, the proportion of upper-middle tobacco, the average price, yield and output value of tobacco leaves, significantly improve economic traits, and increase income for tobacco farmers.

[0108] Table 6 Economic characteristics of flue-cured tobacco after application of compound soil conditioner

[0109]

[0110] In summary, the application of compound soil conditioners can not only effectively reduce the stem content of each leaf position of flue-cured tobacco, thereby improving the utilization value of tobacco leaves, but also improve the economic traits of flue-cured tobacco and increase economic benefits, which has great promotion value. In addition, the materials of the conditioner itself are beneficial to the soil itself and will not cause damage to the soil environment. The materials are all common crop fertilizers, and the auxiliary materials also have a promoting effect on the soil environment. The preparation method is simple and the application method is convenient.

[0111] In addition, some test results of Examples 2-4 and Comparative Examples 1-5 are summarized as follows:

[0112]

[0113]

[0114]

[0115] From the above data, it can be found that the present invention, through the synergistic effect of the combination of inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan, can further promote the growth and development of tobacco leaves, further reduce the stem content of tobacco leaves, and increase tobacco leaf yield and output value.

[0116] The applicant declares that the present invention illustrates the soil conditioner and its preparation method and application through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0117] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0118] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A soil conditioner, characterized in that: The soil conditioner comprises, by weight, 45-50 parts of inorganic compound fertilizer, 45-50 parts of potassium humate, 70-75 parts of earthworm castings, 20-25 parts of water-soluble silicon fertilizer and 0.5-1 part of chitosan.

2. The soil conditioner according to claim 1, characterized in that The inorganic compound fertilizer includes at least two of calcium fertilizer, magnesium fertilizer or potassium fertilizer; Preferably, the effective calcium content of the inorganic compound fertilizer is not less than 25%; Preferably, the effective magnesium content in the inorganic compound fertilizer is not less than 12%; Preferably, the effective potassium content in the inorganic compound fertilizer is not less than 2%.

3. The soil conditioner according to claim 1 or 2, characterized in that The organic matter content of the potassium humate is not less than 60%, and the fulvic acid content is not less than 35%.

4. The soil conditioner according to any one of claims 1 to 3, characterized in that The content of effective ingredients in the water-soluble silicon fertilizer is not less than 50%.

5. The soil conditioner according to any one of claims 1 to 4, characterized in that The soil conditioner also includes auxiliary materials, which include any one of wood ash, dolomite powder, gypsum, perlite or bentonite, or a combination of at least two of them.

6. The soil conditioner according to claim 5, characterized in that The auxiliary materials include, by weight, 15-25 parts of plant ash, 5-10 parts of dolomite powder, 10-15 parts of gypsum, 5-10 parts of perlite and 10-20 parts of bentonite.

7. A method for preparing a soil conditioner according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: The inorganic compound fertilizer, potassium humate, earthworm castings, water-soluble silicon fertilizer and chitosan are mixed, and the obtained mixture is crushed and sieved to obtain the soil conditioner.

8. The preparation method according to claim 7, characterized in that: After the crushing and screening, the method further includes mixing auxiliary materials with the mixture and water to form granules.

9. Use of the soil conditioner according to any one of claims 1 to 6 in growing tobacco with a low stem content in tobacco leaves.

10. The use according to claim 9, characterized in that: The soil conditioner is applied together with the base fertilizer when used; Preferably, the amount of the soil conditioner is 150-300 kg per mu.

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