A potassium-rich soil conditioner for alleviating tobacco-growing soil acidification, and its preparation method and application

Abstract

The present invention relates to a potassium-rich soil conditioner for alleviating tobacco-growing soil acidification, a preparation method thereof, and an application thereof, and relates to the technical field of soil improvement. The potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following components, measured by weight: 15 to 22 parts of oil cake, 8 to 13 parts of oyster shell powder, and 20 to 30 parts of a potassium-rich mixture. The potassium-rich soil conditioner provided by the present invention significantly improves tobacco-growing soil acidification by combining oil cake, oyster shell powder, and a specific potassium-rich mixture, thereby comprehensively improving soil fertility. Experimental results also show that the treatment group treated with the conditioner, such as root length, had significantly higher tobacco plant root development indicators than the control treatment, thereby promoting tobacco plant root development and having broad practical application value.

Description

Technical Field

[0001] The present invention relates to the technical field of soil improvement, and in particular to a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil, and a preparation method and application thereof. Background Art

[0002] Tobacco, a major cash crop, is widely cultivated worldwide. Its yield and quality are directly linked to farmers' incomes and the development of the tobacco industry. However, soil acidification, a major constraint to the sustainable development of the tobacco industry, has become increasingly problematic due to the long-term and extensive use of traditional potash fertilizers such as potassium sulfate, inappropriate farming practices, and natural factors. This acidification not only reduces soil fertility but also impairs the absorption and utilization of nutrients by tobacco, leading to stunted growth and reduced yield and quality. This problem is particularly prominent in areas with acidic soils, posing a significant challenge to tobacco cultivation.

[0003] To address the issue of soil acidification in tobacco-growing areas, researchers at home and abroad have conducted extensive research and practice. Among these, the use of soil conditioners is an effective method. Traditional soil conditioners mainly include alkaline substances such as lime and gypsum, which can neutralize acidic substances in the soil and increase the soil pH. However, while these traditional conditioners can improve soil acidification, they also have some shortcomings. For example, the application rate of lime and gypsum is difficult to control, and excessive application can lead to soil compaction, nutrient imbalance, and other problems. At the same time, they also have a certain impact on the activity of soil microorganisms, which may disrupt the balance of the soil ecosystem.

[0004] In view of this, finding a soil conditioner that can not only meet tobacco's demand for potassium but also effectively alleviate soil acidification has become an urgent problem to be solved in the current tobacco planting field. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil, as well as a preparation method and application thereof.

[0006] In a first aspect, the present invention provides a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil. The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil comprises the following components in parts by weight:

[0007] 15-22 parts of oil cake, 8-13 parts of oyster shell powder, and 20-30 parts of potassium-rich mixture;

[0008] The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of (1-2):(1-2):(5-7).

[0009] Furthermore, the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following components in parts by weight:

[0010] 18.2 parts of oil cake, 10.5 parts of oyster shell powder, and 25 parts of potassium-rich mixture.

[0011] Furthermore, the potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 1.5:2:6.

[0012] In a second aspect, the present invention provides a method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to any one of the first aspects, the preparation method comprising the following steps:

[0013] The oil cake is crushed, and then oyster shell powder is added and stirred to obtain a first mixture;

[0014] subjecting the first mixed material to oxygen-enriched microwave plasma treatment to obtain a second mixed material;

[0015] The second mixed material and the potassium-rich mixture are stirred and mixed to obtain the potassium-rich soil conditioner.

[0016] Furthermore, the particle size of the first mixture is 50-100 mesh.

[0017] Furthermore, the step of subjecting the first mixed material to oxygen-enriched microwave plasma treatment to obtain the second mixed material includes the following process:

[0018] The first mixture is added to a microwave plasma treatment device, the microwave power of the microwave plasma treatment device is set to 340-410W, oxygen and argon with a volume ratio of 6:1 are introduced as working media for glow discharge treatment for 30-60 seconds, and then oxygen is continued to be introduced for 5-10 minutes to obtain the second mixture.

[0019] Furthermore, the working condition parameters of the oxygen-enriched microwave plasma treatment include: microwave power of 375W, glow discharge treatment time of 45 seconds, and an intake volume of the working medium of 60-70 mL / min.

[0020] In a third aspect, the present invention provides the use of the potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil as described in any one of the first and second aspects in preparing fertilizers and promoting the development of tobacco plant roots.

[0021] In a fourth aspect, the present invention provides a fertilizer for promoting the development of tobacco plant roots, the fertilizer comprising at least the potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil as described in any one of the first and second aspects.

[0022] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0023] An embodiment of the present invention provides a potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil. The potassium-rich soil conditioner provided by the present invention is used in combination with oil cake, oyster shell powder and a specific potassium-rich mixture, which has a significant improvement effect on the acidification of tobacco-growing soil and comprehensively improves soil fertility. At the same time, experimental results show that the treatment group treated with the present conditioner, such as root length and other tobacco plant root development indicators, are significantly higher than the control treatment, which promotes the root development of the tobacco plants and has broad practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic flow chart of a method for preparing a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil provided in an embodiment of the present invention.

[0027] Figure 2 This is a scan of the root system of tobacco plants in the soil acidification control potted experiment of the CK group in the test example of the present invention.

[0028] Figure 3 This is a scan of the root system of tobacco plants in the soil acidification control potted experiment of group T1 in the test example of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0031] In a first aspect, the present invention provides a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil. The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil comprises the following components in parts by weight:

[0032] 15-22 parts of oil cake, 8-13 parts of oyster shell powder, and 20-30 parts of potassium-rich mixture;

[0033] The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of (1-2):(1-2):(5-7).

[0034] An embodiment of the present invention provides a potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil. The potassium-rich soil conditioner provided by the present invention is used in combination with oil cake, oyster shell powder and a specific potassium-rich mixture, which has a significant improvement effect on the acidification of tobacco-growing soil and comprehensively improves soil fertility. At the same time, experimental results show that the treatment group treated with the present conditioner, such as root length and other tobacco plant root development indicators, are significantly higher than the control treatment, which promotes the root development of the tobacco plants and has broad practical application value.

[0035] In the present invention, oil cake refers to a byproduct made from the residue left after various oil-rich seeds are squeezed to remove the oil. Rapeseed cake is a common form of oil cake, which is made from the residue cake left after rapeseed oil is squeezed. Rapeseed cake is preferably used in the present invention.

[0036] In the present invention, the oyster shell powder is a powder obtained by crushing oyster shells, which is rich in calcium carbonate, various amino acid components such as glycine, cystine, methionine, isoleucine, leucine, tyrosine, phenylalanine, and trace elements such as copper, magnesium, potassium, molybdenum, phosphorus, manganese, iron, zinc, etc.

[0037] In the present invention, potassium humate is an organic compound with a CAS number of 68514-28-3.

[0038] In the present invention, the CAS number of potassium silicate is 1312-76-1.

[0039] In this context, wood ash refers to the residue left after burning plants (herbs and woody plants), primarily consisting of insoluble impurities and potassium salts. The primary component of wood ash is potassium carbonate. It also contains phosphorus, calcium, magnesium, silicon, sulfur, and various trace nutrients such as iron, manganese, copper, zinc, boron, and molybdenum. Potassium is particularly abundant, typically containing 6% to 12%, of which over 90% is water-soluble and exists in the form of carbonates. Phosphorus is the second most abundant, typically containing 1.5% to 3%.

[0040] In some specific embodiments, the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following components in parts by weight:

[0041] 18.2 parts of oil cake, 10.5 parts of oyster shell powder, and 25 parts of potassium-rich mixture.

[0042] In some specific embodiments, the potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 1.5:2:6, and the three can be directly compounded.

[0043] In the second aspect, based on the same inventive concept, the present invention provides a method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to any one of the first aspects, such as Figure 1 As shown, the preparation method comprises the following steps:

[0044] The oil cake is crushed, and then oyster shell powder is added and stirred to obtain a first mixture;

[0045] subjecting the first mixed material to oxygen-enriched microwave plasma treatment to obtain a second mixed material;

[0046] The second mixed material and the potassium-rich mixture are stirred and mixed to obtain the potassium-rich soil conditioner.

[0047] The present invention organically combines oil cake, oyster shell powder and a potassium-rich mixture through the above-mentioned preparation process to form a potassium-rich soil conditioner. Among them, mixing the oil cake and oyster shell powder and then subjecting them to oxygen-rich microwave plasma treatment is one of the key steps. After mixing the oil cake and oyster shell powder, microwave plasma treatment is carried out in an oxygen-rich environment. Under the action of high temperature and high-energy particles, the decomposition and oxidation process of organic matter can be accelerated, the rapid conversion of organic matter in the oil cake and the modification and activation of oyster shell powder can be promoted, the nutrient release rate is accelerated, and a nutrient form that is easier for plants to absorb and utilize is formed, so that the conditioner has better fertilizer efficiency and improvement effect in the soil.

[0048] In some specific embodiments, the particle size of the first mixture is 50-100 mesh.

[0049] In some specific embodiments, the step of subjecting the first mixed material to oxygen-enriched microwave plasma treatment to obtain the second mixed material comprises the following process:

[0050] The first mixture is added to a microwave plasma treatment device, the microwave power of the microwave plasma treatment device is set to 340-410W, oxygen and argon with a volume ratio of 6:1 are introduced as working media for glow discharge treatment for 30-60 seconds, and then oxygen is continued to be introduced for 5-10 minutes to obtain the second mixture.

[0051] In some specific embodiments, the working condition parameters of the oxygen-enriched microwave plasma treatment include: microwave power of 375W, glow discharge treatment time of 45 seconds, and an intake volume of the working medium of 60-70 mL / min.

[0052] In a third aspect, based on the same inventive concept, the present invention provides the use of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification as described in any one of the first and second aspects in preparing fertilizers and promoting tobacco plant root development.

[0053] The potassium-rich soil conditioner provided by the present invention for alleviating the acidification of tobacco-growing soil can be appropriately added to the basic fertilizer for tobacco planting. It can not only improve the quality and effect of the fertilizer, but also improve the soil environment and promote the healthy development of the tobacco plant root system, thereby improving the yield and quality of the tobacco plants, and has a wide range of uses.

[0054] In a fourth aspect, based on the same inventive concept, the present invention provides a fertilizer for promoting the development of tobacco plant roots, wherein the fertilizer comprises at least the potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil as described in any one of the first and second aspects.

[0055] In some specific embodiments, the fertilizer for promoting the root development of tobacco plants provided by the present invention includes commercially available fertilizers such as Sacfu as basic fertilizer and is added with the potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil as described in any one of the first and second aspects.

[0056] It should be noted that the components and raw materials involved in the potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil and the preparation method thereof provided in the embodiments of the present invention, unless otherwise specified or specifically explained, can be directly commercially available products or homemade using existing public preparation methods; at the same time, the steps and parameters involved, unless otherwise specified or specifically explained, can be carried out according to the existing processing technology of potassium-rich soil conditioners or directly using existing equipment, and the present invention document will not elaborate on them one by one.

[0057] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0058] Example 1

[0059] This example provides a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil. The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil comprises the following components in parts by weight:

[0060] 18.2 parts of oil cake, 10.5 parts of oyster shell powder, and 25 parts of potassium-rich mixture;

[0061] The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 1.5:2:6.

[0062] The preparation method of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following steps:

[0063] Step (1): crushing the oil cake, adding oyster shell powder, stirring and mixing, and passing through a 50-mesh sieve to obtain a first mixture;

[0064] Step (2): adding the first mixed material obtained in step (1) to a microwave plasma treatment device, setting the microwave power of the microwave plasma treatment device to 375 W, introducing oxygen and argon with a volume ratio of 6:1 as a working medium, and performing glow discharge treatment for 45 seconds. The air intake of the working medium is 65 mL / min, and then continuing to introduce oxygen for 10 minutes to obtain the second mixed material;

[0065] Step (3): stirring and mixing the second mixture obtained in step (2) and the potassium-rich mixture to obtain the potassium-rich soil conditioner.

[0066] Example 2

[0067] This example provides a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil. The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil comprises the following components in parts by weight:

[0068] 15 parts of oil cake, 8 parts of oyster shell powder, and 20 parts of potassium-rich mixture;

[0069] The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 1:1:5.

[0070] The preparation method of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following steps:

[0071] Step (1): crushing the oil cake, adding oyster shell powder, stirring and mixing, and passing through a 50-mesh sieve to obtain a first mixture;

[0072] Step (2): adding the first mixed material obtained in step (1) to a microwave plasma treatment device, setting the microwave power of the microwave plasma treatment device to 340 W, introducing oxygen and argon with a volume ratio of 6:1 as a working medium, and performing glow discharge treatment for 60 seconds. The air intake of the working medium is 65 mL / min, and then continuing to introduce oxygen for 10 minutes to obtain the second mixed material;

[0073] Step (3): stirring and mixing the second mixture obtained in step (2) and the potassium-rich mixture to obtain the potassium-rich soil conditioner.

[0074] Example 3

[0075] This example provides a potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil. The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil comprises the following components in parts by weight:

[0076] 22 parts of oil cake, 13 parts of oyster shell powder, and 30 parts of potassium-rich mixture;

[0077] The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 2:2:7.

[0078] The preparation method of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following steps:

[0079] Step (1): crushing the oil cake, adding oyster shell powder, stirring and mixing, and passing through a 50-mesh sieve to obtain a first mixture;

[0080] Step (2): adding the first mixed material obtained in step (1) to a microwave plasma treatment device, setting the microwave power of the microwave plasma treatment device to 410 W, introducing oxygen and argon with a volume ratio of 6:1 as a working medium for glow discharge treatment for 30 seconds, and the air intake rate of the working medium is 65 mL / min, and then continuing to introduce oxygen for 10 minutes to obtain the second mixed material;

[0081] Step (3): stirring and mixing the second mixture obtained in step (2) and the potassium-rich mixture to obtain the potassium-rich soil conditioner.

[0082] Comparative Example 1

[0083] This example provides a potassium-rich soil conditioner for alleviating tobacco-growing soil acidification and a preparation method thereof. The only difference from Example 1 is that no oxygen-rich microwave plasma treatment is performed; the remaining steps and parameters are the same.

[0084] The preparation method of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following steps:

[0085] Step (1): crushing the oil cake, adding oyster shell powder, stirring and mixing, and passing through a 50-mesh sieve to obtain a first mixture;

[0086] Step (2): stirring and mixing the first mixture obtained in step (1) and the potassium-rich mixture to obtain the potassium-rich soil conditioner.

[0087] Comparative Example 2

[0088] This example provides a potassium-rich soil conditioner for alleviating tobacco-growing soil acidification and a preparation method thereof. The only difference from Example 1 is that the potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 6:2:1.5; the remaining steps and parameters are the same.

[0089] Test Case

[0090] This example uses the potassium-rich soil conditioners provided in Examples 1 to 3 and Comparative Examples 1 to 2 to conduct a potted plant experiment on soil acidification control, specifically including the following process:

[0091] 1. Experimental Design

[0092] 1.1 Test points and materials

[0093] The test site is the Qingdao Jimo Experimental Base of the Tobacco Research Institute of the Chinese Academy of Agricultural Sciences. The test is carried out in greenhouse potted plants. The test soil is acidified tobacco-growing soil in Yishui County, Shandong Province (passed through a 2mm sieve), with a pH of 4.34. The test flue-cured tobacco variety is K326, and the transplanting time is May 8, 2023.

[0094] 1.2 Trial Grouping

[0095] CK group (conventional fertilization control, Sacfu (15-15-15) as basic fertilizer 42.5 g + potassium sulfate 25 g);

[0096] Group T1 (experimental group, 42.5 g of Sacfu (15-15-15) as basic fertilizer + 25 g of the potassium-rich soil conditioner provided in Example 1);

[0097] Group T2 (experimental group, 42.5 g of Sacfu (15-15-15) as basic fertilizer + 25 g of the potassium-rich soil conditioner provided in Example 2);

[0098] Group T3 (experimental group, 42.5 g of Sacfu (15-15-15) as the basic fertilizer + 25 g of the potassium-rich soil conditioner provided in Example 3);

[0099] Group T4 (experimental group, 42.5 g of Sacfu (15-15-15) as basic fertilizer + 25 g of the potassium-rich soil conditioner provided in Comparative Example 1);

[0100] T5 group (experimental group, 42.5 g of Sacfu (15-15-15) as basic fertilizer + 25 g of the potassium-rich soil conditioner provided in Comparative Example 2);

[0101] There were three treatments in each group of experiments.

[0102] 1.3 Test methods

[0103] Each pot was filled with 4 kg of soil. The potting soil was fully mixed with the test materials. First, 1 / 3 of the bottom soil was filled, and then the middle 1 / 3 was mixed with fertilizer and then filled. Finally, the remaining 1 / 3 of the soil was filled. Before transplanting, an equal amount of water was poured until the soil in the pot was fully moistened. Tobacco seedlings with consistent growth were selected for transplanting. All management measures in the later stage were kept consistent between treatments.

[0104] 1.4 Measurement indicators

[0105] Potted soil samples were collected during the tobacco plant's mass growth period, placed in ziplock bags, and brought back to the laboratory. After natural air drying and sieving, they were used to determine soil physical and chemical properties, soil nutrient content, and tobacco plant root development analysis. The test results are shown in Tables 1, 2, and 3. Among them, the soil pH test method for the soil acidification control potted experiment includes: weighing 10.00 g of air-dried soil sample that passed a 2 mm sieve into a 50 mL tall beaker, adding 25 mL of carbon dioxide-free distilled water, and vigorously stirring with a glass rod for 1 to 2 minutes. The mixture was allowed to stand for 30 minutes. At this time, the influence of ammonia or volatile acid gases in the air should be avoided, and then the pH was measured using a pH meter. The soil nutrient content test methods include: 1) Soil total organic carbon: 0.2000 g of air-dried soil sample passing through a 100-mesh sieve was weighed into a sample boat and measured using a TOC analyzer (multi N / C3100, Germany); 2) Soil available potassium: measured using the ammonium acetate extraction-flame photometer method, that is, 5 g of air-dried soil sample passing through a 2 mm sieve was weighed into a 250 mL conical flask, 50 mL of 1 M NH4OAc solution was added, and the mixture was shaken for 30 min (120 rpm). The mixture was filtered, the filtrate was collected, and the potassium content in the filtrate was measured using a flame photometer; 3) Soil available phosphorus: measured using the sodium bicarbonate extraction-molybdenum antimony colorimetric method, that is, 2.5 g of air-dried soil sample passing through a 2 mm sieve was weighed into a 150 mL conical flask, 50 mL of 0.5 M NaHCO3 solution was shaken for 30 minutes (180 r / min), filtered through filter paper, and the filtrate was collected. 5 mL of the filtrate was added to an ammonium molybdate-ascorbic acid mixed reagent. After the reaction, colorimetry was performed at a wavelength of 700 nm. The absorbance was measured using a spectrophotometer to calculate the available phosphorus content in the soil. 4) Soil alkaline nitrogen: The alkaline diffusion method was used, i.e., 2 g of air-dried soil sample was weighed and placed in the outer chamber of a diffusion dish. 10 mL of 1 M NaOH solution was added to the inner chamber of the diffusion dish, which was quickly sealed. The alkaline diffusion reaction was carried out at 40°C for 24 hours. The ammonia in the absorption solution was titrated with 0.01 M HCl solution, and the soil alkaline nitrogen content was calculated based on the amount of hydrochloric acid consumed. The test method for the root development of tobacco plants in the soil acidification control potted experiment includes: placing the roots in a scanning tray, adding distilled water to cover the roots, laying the roots flat, and ensuring that there is no intersection between the main roots and the primary lateral roots. After laying, place the roots in a root scanner for scanning, and use WinRHIZ0 analysis software to analyze the root scan images and extract and analyze the root length data.

[0106] Table 1 Soil pH test results of soil acidification control pot test

[0107] Treatment group Soil pH CK 4.31 T1 5.94 T2 5.63 T3 5.75 T4 4.92 T5 5.10

[0108] As shown in Table 1, compared to the CK group, the soil pH in each experimental group increased, i.e., the soil acidity decreased. Among them, the potassium-rich soil conditioner provided by Examples 1 to 3 of the present invention had a more significant effect on regulating soil acidity. After improvement, the soil pH was maintained between 5.5 and 6.5, which is more conducive to tobacco growth.

[0109] Table 2 Soil nutrient content test results

[0110]

[0111] As shown in Table 2, compared with the CK group, the potassium-rich soil conditioner provided by Examples 1 to 3 of the present invention significantly improved the fertility of the acidified soil of tobacco plants. Specifically, the increases in total organic carbon, available potassium, available phosphorus, and alkaline-hydrolyzable nitrogen in the T1 group using Example 1 were 111.13%, 78.63%, 50.68%, and 69.65%, respectively.

[0112] Table 3 Root development of tobacco plants in the soil acidification treatment pot experiment

[0113]

[0114] As shown in Table 3, compared with the CK group, the potassium-rich soil conditioner provided by Examples 1 to 3 of the present invention has a better effect on promoting the root development of tobacco plants than that of the comparative examples 1 to 2. In addition, the microscopic scanning images of the roots of tobacco plants in the soil acidification treatment pot test of the CK group are as follows: Figure 2 As shown in the following figure, the root microscopic scan of tobacco plants in the soil acidification treatment pot experiment of group T1 is as follows: Figure 3 As shown. Figure 2 and Figure 3 From an intuitive comparison, it can be seen that after the potassium-rich soil conditioner provided by the embodiment of the present invention is applied, the number of adventitious roots in the root system of the tobacco plant is more developed and the root surface area is larger.

[0115] In summary, the embodiments of the present invention provide a potassium-rich soil conditioner for alleviating the acidification of tobacco-growing soil, as well as its preparation method and application. By using oil cake, oyster shell powder and a specific potassium-rich mixture in combination, the acidification of tobacco-growing soil is significantly improved, and the soil fertility is comprehensively improved. At the same time, the experimental results show that the treatment group treated with this conditioner, such as root length and other tobacco root development indicators, are significantly higher than the control treatment, which promotes the root development of tobacco plants and has broad practical application value.

[0116] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in a range format is only for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention; therefore, the range description should be considered to have specifically disclosed all possible subranges and single numerical values ​​within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is intended to include any cited numeral (fractional or integer) within the indicated range.

[0117] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing a potassium-rich soil conditioner for alleviating tobacco-growing soil acidification, characterized in that: The potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following components in parts by weight: 15-22 parts of oil cake, 8-13 parts of oyster shell powder, and 20-30 parts of potassium-rich mixture; The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of (1-2): (1-2): (5-7); The preparation method of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following steps: The oil cake is crushed, and then oyster shell powder is added and stirred to obtain a first mixture; The first mixture was added to a microwave plasma treatment device, the microwave power of the microwave plasma treatment device was set to 340-410 W, oxygen and argon with a volume ratio of 6:1 were introduced as working media for glow discharge treatment for 30-60 seconds, and oxygen was continued to be introduced for 5-10 minutes to obtain a second mixture; The second mixed material and the potassium-rich mixture are stirred and mixed to obtain the potassium-rich soil conditioner.

2. The method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 1, characterized in that: The potassium-rich soil conditioner for alleviating tobacco-growing soil acidification comprises the following components in parts by weight: 18.2 parts of oil cake, 10.5 parts of oyster shell powder, and 25 parts of potassium-rich mixture.

3. The method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 1, characterized in that: The potassium-rich mixture is composed of potassium humate, potassium silicate and wood ash in a weight ratio of 1.5:2:

6.

4. The method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 1, characterized in that: The particle size of the first mixture is 50-100 mesh.

5. The method for preparing the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 1, characterized in that: The microwave power is 375 W, the glow discharge treatment time is 45 seconds, and the air intake volume of the working medium is 60-70 mL / min.

6. A potassium-rich soil conditioner for alleviating tobacco-growing soil acidification, characterized in that: The potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil is prepared by the preparation method of the potassium-rich soil conditioner for alleviating acidification of tobacco-growing soil according to any one of claims 1 to 5.

7. Use of the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 6 in preparing fertilizers and promoting tobacco plant root development.

8. A fertilizer for promoting root development of tobacco plants, characterized in that: The fertilizer at least includes the potassium-rich soil conditioner for alleviating tobacco-growing soil acidification according to claim 6.

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