Special fertilizer for increasing tobacco leaf oil content and preparation method thereof

Abstract

The invention belongs to the technical field of fertilizers, relates to the technical field of tobacco fertilizers, and particularly relates to a special fertilizer for increasing tobacco leaf oil content and a preparation method thereof. The special fertilizer for increasing the tobacco leaf oil content is a sustained-release particle, the sustained-release particle is composed of a component A, a component B and a component C, the sustained-release particle sequentially comprises the component A, the component B and the component C from outside to inside, the component B wraps the component C, and the component A wraps the component B and is a shell of the sustained-release particle; the raw materials of the component A, the component B and the component C are the same, but the raw material dosages are different. The special fertilizer for increasing tobacco leaf oil provides a nutritional basis for oil substances such as synthetic lipids, glycosides, organic acids, phenols and the like, promotes photosynthesis of leaves and metabolism of secondary substances, increases accumulation of dry substances and oil of the leaves, increases the content of total sugar and potassium, coordinates chemical components, improves smoking quality, and improves tobacco leaf quality.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, relates to the technical field of tobacco fertilizers, and specifically relates to a special fertilizer for increasing the oil content of tobacco leaves and a preparation method thereof. Background Art

[0002] Oil is a soft semi-liquid or liquid substance contained in tobacco tissue cells. Tobacco with more oil is soft in appearance and of better quality. According to the national standard for flue-cured tobacco (GB / T2635-1992), the oil content of tobacco leaves is qualitatively described by four grades of appearance: "more, some, slightly, less". The quantitative description of oil content in tobacco leaves is usually expressed by the amount of petroleum ether extract. Petroleum ether extract is a mixture of various substances obtained by Soxhlet extraction of tobacco leaves using petroleum ether as solvent in accordance with the YC / T176-2003 standard, mainly including volatile oils, resins, oils, fatty acids, waxes, lipids, sterols, pigments and other substances.

[0003] There are many factors that affect the oil content of tobacco leaves, including the tobacco variety, ecological environment, agronomic measures, baking and curing, and leaf storage environment. Under the conditions of consistent variety and ecology, tobacco nutrition is a very important aspect affecting oil content. From leaf bud differentiation to maturity and aging, tobacco leaves absorb nutrients, photosynthesize and metabolize substances to complete the synthesis and accumulation of oil substances. In this process, the organic and inorganic nutrients absorbed by the tobacco plants play a very important regulatory role in the oil substances and their metabolic enzyme activities. Currently, nutrients are provided to tobacco plants by applying fertilizers. In the current technology, organic fertilizers have a long fertilizer effect but are released slowly, while inorganic fertilizers have a short fertilizer effect due to fast release. For this reason, slow-release fertilizers have been used, but the existing slow-release fertilizers are all inorganic slow-release fertilizers. The slow-release effect is achieved by adding various inorganic minerals. However, long-term use leads to an increase in inorganic minerals in the soil, which in turn leads to obvious soil degradation. There is also a technology that proposes to mix inorganic fertilizers with organic fertilizers. In the early stage of the tobacco plant, the fertility is provided by inorganic fertilizers, and in the later stage of the tobacco plant, the fertility is provided by slow-release organic fertilizers. However, this situation leads to uneven types of fertility provided to the tobacco plant, and it cannot guarantee that sufficient specific nutrients are provided to the tobacco leaves.

[0004] Existing technologies for increasing the oil content of flue-cured tobacco include: first, planting flue-cured tobacco varieties with higher oil content; second, improving the soil, adjusting the carbon-nitrogen ratio and physical and chemical properties, and coordinating the nutritional metabolism of tobacco plants; third, timely transplanting to make good use of ecological conditions such as light, temperature, and water, and improving harvest maturity; fourth, improving the temperature, humidity, and wind speed parameters of the baking and modulation process to promote the synthesis of oil substances and reduce losses. These existing technologies can increase the oil content of tobacco leaves to a certain extent, but under specific planting varieties and ecological environments, it is important to improve the oil content of tobacco leaves by adjusting the nutrient composition, coordinating the nutritional regulation of tobacco plants by different nutrients such as organic and inorganic, macro and trace elements, increasing the metabolic synthesis of oil precursors in the leaves, promoting the accumulation of volatile oils, resins, oils, fatty acids, waxes, lipids, sterols and other oil substances, and improving the quality of tobacco leaves. Summary of the invention

[0005] The object of the present invention is to provide a special fertilizer for increasing the oil content of tobacco leaves and a preparation method thereof, so as to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above objectives, this application is implemented by the following technical solutions:

[0007] A special fertilizer for increasing tobacco oil content is a slow-release particle, the slow-release particle is composed of component A, component B and component C, and the slow-release particle is composed of component A, component B and component C from the outside to the inside, component B covers component C, component A covers component B and is the shell of the slow-release particle;

[0008] The raw materials of component A, component B and component C are the same, but the amounts of the raw materials are different.

[0009] Furthermore, the raw materials are composed of fried sesame seeds, crushed and fried soybean grains, decomposed pure sesame cakes, animal and plant organic fertilizers, mineral potassium humate, zinc sulfate, borax, copper sulfate and decomposed cow dung.

[0010] Furthermore, the weight percentage of each raw material in component A is: 0.4-0.6% of roasted sesame, 0.4-0.6% of crushed and roasted soybean particles, 2-2.5% of decomposed pure sesame cake, 2-2.5% of animal organic fertilizer, 0.2-0.4% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung;

[0011] The weight percentage of each raw material in component B is: 0.8-1.0% of fried sesame, 0.8-1.0% of crushed and fried soybean particles, 2.8-3.2% of decomposed pure sesame cake, 2.8-3.2% of animal organic fertilizer, 0.5-0.8% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung;

[0012] The weight percentage of each raw material in component C is: 1.2-1.6% of fried sesame seeds, 1.2-1.6% of crushed and fried soybean particles, 3.5-4.0% of decomposed pure sesame cakes, 3.5-4.0% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung.

[0013] Furthermore, the sustained-release granules are composed of 10-30% of component A, 20-40% of component B and 40-50% of component C by weight.

[0014] Furthermore, in the sustained-release granules, the hardness of component A, component B and component C gradually increases.

[0015] A method for preparing any one of the above-mentioned special fertilizers for increasing tobacco oil content, comprising the following steps:

[0016] S1. According to the composition of component C, corresponding raw materials are prepared and fully mixed to obtain a mixed material C;

[0017] S2, using a granulator to granulate the mixed material C to obtain component C particles;

[0018] S3, preparing corresponding raw materials according to the composition of component B, and fully mixing the component C particles obtained in step S2 with the raw materials of component B to obtain a mixed material B;

[0019] S4, using a granulator to granulate the mixed material B to obtain composite particles;

[0020] S5, preparing corresponding raw materials according to the composition of component A, and fully mixing the composite particles obtained in step S4 with the raw materials of component A to obtain a mixed material A;

[0021] S6. Use a granulator to granulate the mixed material A to obtain sustained-release granules.

[0022] Furthermore, the ratio of the granulation pressure of the granulator in step S2, the granulation pressure of the granulator in step S4, and the granulation pressure of the granulator in step S6 is 5:4:3.

[0023] The beneficial effects of the present invention are:

[0024] The special fertilizer for increasing tobacco leaf oil content of the present invention provides a nutritional basis for synthetic lipids, glycosides, organic acids, phenols and other oil substances, promotes leaf photosynthesis and secondary biomass metabolism, increases the accumulation of leaf dry matter and oil, increases the total sugar and potassium content, coordinates the chemical composition, improves the smoking quality, and improves the quality of tobacco leaves.

[0025] The special fertilizer for increasing the oil content of tobacco leaves of the present invention adopts a slow-release particle structure, and the hardness of the slow-release particles is gradually increased from the inside to the outside, so that after the slow-release particles are applied to the soil, because the tobacco plants are in the growth period when the fertilizer is applied, the demand for the oil content in the tobacco leaves is relatively small. At this time, the component A of the outer layer of the slow-release particles first provides nutrients, and the amount of the fried sesame seeds, crushed and fried soybean particles, decomposed pure sesame cakes and animal and plant organic fertilizers in the component A is relatively small, and the component A is the outer layer of the slow-release particles, which protects the release of the nutrients of the components B and C in the inner layer. As the tobacco plants grow, the components B and C provide nutrients to the tobacco plants in turn. When the tobacco plants are in the late growth stage and the tobacco leaves store oil content, the component C is in the nutrient supply stage, and the amount of the fried sesame seeds, crushed and fried soybean particles, decomposed pure sesame cakes and animal and plant organic fertilizers in the component C is relatively high, which can better meet the nutritional needs of the tobacco leaves for storing oil content. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0027] The present application discloses a special fertilizer for increasing the oil content of tobacco leaves, which is a slow-release granule. The slow-release granule is composed of component A, component B and component C, and the slow-release granule is component A, component B and component C from the outside to the inside, component B covers component C, component A covers component B and is the outer shell of the slow-release granule; the raw materials of component A, component B and component C are the same, but the amounts of the raw materials are different.

[0028] In the present application, the raw materials are composed of fried sesame seeds, crushed and fried soybean grains, decomposed pure sesame cakes, animal and plant organic fertilizers, mineral potassium humate, zinc sulfate, borax, copper sulfate and decomposed cow dung.

[0029] In the present application, the weight percentage of each raw material in component A is: 0.4-0.6% of fried sesame, 0.4-0.6% of crushed and fried soybean particles, 2-2.5% of decomposed pure sesame cake, 2-2.5% of animal organic fertilizer, 0.2-0.4% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung;

[0030] The weight percentage of each raw material in component B is: 0.8-1.0% of fried sesame, 0.8-1.0% of crushed and fried soybean particles, 2.8-3.2% of decomposed pure sesame cake, 2.8-3.2% of animal organic fertilizer, 0.5-0.8% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung;

[0031] The weight percentage of each raw material in component C is: 1.2-1.6% of fried sesame seeds, 1.2-1.6% of crushed and fried soybean particles, 3.5-4.0% of decomposed pure sesame cakes, 3.5-4.0% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung.

[0032] In the present application, the sustained-release granules are composed of 10-30% of component A, 20-40% of component B and 40-50% of component C by weight percentage.

[0033] In the present application, in the sustained-release granules, the hardness of component A, component B and component C gradually increases.

[0034] The preferred raw materials used in the present invention are: commercially available pre-pressed oil fried white sesame, with a moisture content of 1.2%, a fat content of 43.6%, and an impurity content of 0.57%; the fried soybean crushed particles are ordinary soybeans sold on the market, which are fried and then mechanically crushed into particles with a diameter of about 0.3 mm, a moisture content of about 2%, a fat content of 16.7%, and an impurity content of 0.8%; the decomposed pure sesame cake is a commercially available product after the sesame cake is decomposed after the sesame oil is squeezed, with a total N content of 3.18%, a P2O5 of 0.79%, a K2O of 1.56%, an organic matter of 47.6%, a moisture content of 18.6%, and a carbon-nitrogen ratio of 6.7; the animal and plant organic fertilizer is a commercially available product, with a total nitrogen content of 3.2%, P2O5 is 1.9%, K2O is 1.6%, organic matter is 67.4%, water is 17.5%, protein is 22.3%, and amino acid is 5.9%; mineral potassium humate is selected from ordinary commercial products, with a mineral humic acid content of 52.3%, K2O is 8.6%, water is 13.8%, and the content of water-insoluble substances is less than 5.6%; zinc sulfate (ZnSO4•7H2O) is selected from ordinary commercial products with a purity of ≥99%; copper sulfate (CuSO4) is selected from ordinary commercial products with a purity of ≥98.5%; borax (Na2B4O7•10H2O) is selected from ordinary commercial products with a purity of ≥95%. The cow dung is fresh cow dung sold in the market. After being drained and dispersed to reduce the moisture content to less than 50%, it is mechanically crushed, piled and turned twice, and fermented at high temperature for 20-30 days to form powdered and decomposed cow dung. The organic matter content is 13.4%, the total N content is 0.38%, the P2O5 is 0.19%, the K2O is 0.11%, and the moisture content is less than 26.9%.

[0035] The application method and dosage of the special fertilizer for increasing the production of flue-cured tobacco oil mentioned in this application: use a fertilizer ridging machine with a powder or granular fertilizer distributor to complete the application of the special fertilizer base fertilizer at one time. If non-mechanized manual fertilization is used, it is spread manually according to the row spacing, the fertilization depth is 10-15cm, and the dosage is 500kg per mu. When applying the special fertilizer, the dosage of inorganic fertilizer is appropriately adjusted according to the total amount of nitrogen used per unit area of ​​the tobacco field.

[0036] Example 1

[0037] A method for preparing a special fertilizer for increasing the oil content of tobacco leaves comprises the following steps:

[0038] S1. According to the composition of component C, prepare corresponding raw materials and mix them thoroughly to obtain mixed material C; the weight percentage of each raw material in component C is: 1.2% of fried sesame, 1.2% of crushed and fried soybean particles, 3.5% of decomposed pure sesame cake, 3.5% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung. And component C accounts for 50% of the total weight of the slow-release particles.

[0039] S2. Use a granulator to granulate the mixed material C. The granulation pressure of the granulator is 20 MPa to obtain the particles of component C. In the present application, the particle size of the sustained-release particles and the particle size of component C are not restricted. Those skilled in the art design the particle size according to actual needs, and this is done in the following embodiments.

[0040] S3, prepare the corresponding raw materials according to the composition of component B, and fully mix the component C particles obtained in step S2 with the raw materials of component B to obtain a mixed material B; in this embodiment, the weight percentage of each raw material in component B is: 0.8% of fried sesame, 0.8% of crushed and fried soybean particles, 2.8% of decomposed pure sesame cake, 2.8% of animal organic fertilizer, 0.5% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung. In this embodiment, component B accounts for 30% of the total weight of the slow-release particles.

[0041] S4. Granulate the mixed material B using a granulator with a granulating pressure of 16 MPa to obtain composite particles. Similarly, the particle size of the composite particles is not restricted in the present application, and those skilled in the art may determine the particle size according to actual needs.

[0042] S5. Prepare corresponding raw materials according to the composition of component A, and fully mix the composite particles obtained in step S4 with the raw materials of component A to obtain a mixed material A; in this embodiment, the weight percentage of each raw material in component A is: 0.4% fried sesame seeds, 0.4% crushed and fried soybean particles, 2% decomposed pure sesame cake, 2% animal organic fertilizer, 0.2-0.4% mineral potassium humate, 0.2% zinc sulfate, 0.1% borax, 0.1% copper sulfate, and the balance is decomposed cow dung.

[0043] S6. Use a granulator to granulate the mixed material A. The granulation pressure of the granulator is 12 MPa to obtain sustained-release granules.

[0044] Example 2

[0045] A method for preparing a special fertilizer for increasing the oil content of tobacco leaves comprises the following steps:

[0046] S1. According to the composition of component C, prepare the corresponding raw materials and mix them thoroughly to obtain a mixed material C; the weight percentage of each raw material in component C is: 1.6% of fried sesame, 1.6% of crushed and fried soybean particles, 4.0% of decomposed pure sesame cake, 4.0% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung. And component C accounts for 40% of the total weight of the slow-release particles.

[0047] S2. Use a granulator to granulate the mixed material C. The granulation pressure of the granulator is 20 MPa to obtain component C particles.

[0048] S3, prepare the corresponding raw materials according to the composition of component B, and fully mix the component C particles obtained in step S2 with the raw materials of component B to obtain a mixed material B; in this embodiment, the weight percentage of each raw material in component B is: 1.0% fried sesame, 1.0% crushed and fried soybean particles, 3.2% decomposed pure sesame cake, 3.2% animal organic fertilizer, 0.8% potassium humate from mineral sources, 0.2% zinc sulfate, 0.1% borax, 0.1% copper sulfate, and the balance is decomposed cow dung. In this embodiment, component B accounts for 40% of the total weight of the slow-release particles.

[0049] S4. Granulate the mixed material B using a granulator with a granulating pressure of 16 MPa to obtain composite particles. Similarly, the particle size of the composite particles is not restricted in the present application, and those skilled in the art may determine the particle size according to actual needs.

[0050] S5. Prepare corresponding raw materials according to the composition of component A, and fully mix the composite particles obtained in step S4 with the raw materials of component A to obtain a mixed material A; in this embodiment, the weight percentage of each raw material in component A is: 0.6% fried sesame seeds, 0.6% crushed and fried soybean particles, 2.5% decomposed pure sesame cakes, 2.5% animal organic fertilizer, 0.4% mineral potassium humate, 0.2% zinc sulfate, 0.1% borax, 0.1% copper sulfate, and the balance is decomposed cow dung.

[0051] S6. Use a granulator to granulate the mixed material A. The granulation pressure of the granulator is 12 MPa to obtain sustained-release granules.

[0052] Example 3

[0053] A method for preparing a special fertilizer for increasing the oil content of tobacco leaves comprises the following steps:

[0054] S1. According to the composition of component C, prepare corresponding raw materials and mix them thoroughly to obtain mixed material C; the weight percentage of each raw material in component C is: 1.3% of fried sesame, 1.4% of crushed and fried soybean particles, 3.8% of decomposed pure sesame cake, 3.7% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung. And component C accounts for 45% of the total weight of the slow-release particles.

[0055] S2. Use a granulator to granulate the mixed material C. The granulation pressure of the granulator is 20 MPa to obtain component C particles.

[0056] S3, prepare the corresponding raw materials according to the composition of component B, and fully mix the component C particles obtained in step S2 with the raw materials of component B to obtain a mixed material B; in this embodiment, the weight percentage of each raw material in component B is: 0.9% of fried sesame, 0.8% of crushed and fried soybean particles, 3.0% of decomposed pure sesame cake, 3.0% of animal organic fertilizer, 0.6% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung. In this embodiment, component B accounts for 35% of the total weight of the slow-release particles.

[0057] S4. Granulate the mixed material B using a granulator with a granulating pressure of 16 MPa to obtain composite particles. Similarly, the particle size of the composite particles is not restricted in the present application, and those skilled in the art may determine the particle size according to actual needs.

[0058] S5. Prepare corresponding raw materials according to the composition of component A, and fully mix the composite particles obtained in step S4 with the raw materials of component A to obtain a mixed material A; in this embodiment, the weight percentage of each raw material in component A is: 0.5% fried sesame seeds, 0.5% crushed and fried soybean particles, 2.2% decomposed pure sesame cakes, 2.2% animal organic fertilizer, 0.4% mineral potassium humate, 0.2% zinc sulfate, 0.1% borax, 0.1% copper sulfate, and the balance is decomposed cow dung.

[0059] S6. Use a granulator to granulate the mixed material A. The granulation pressure of the granulator is 12 MPa to obtain sustained-release granules.

[0060] The special fertilizer prepared by Example 2 (500kg / mu, treatment code SY1) and Example 3 (500kg / mu, treatment code SY2) in the technical scheme of the present invention was tested and verified under the same technical conditions of 30kg / mu of decomposed sesame cake fertilizer (CK1) and 30kg / mu of decomposed sesame cake fertilizer + 20kg / mu of biochar (CK2), and the results are as follows.

[0061] ① Differences in content of petroleum ether extract:

[0062] When the flue-cured tobacco leaves matured in the middle, the 13th leaf position was collected, and the petroleum ether extract content of C3F grade tobacco leaves after 65℃ drying and normal curing was determined. The results are shown in Table 1. The petroleum ether extract of fresh tobacco leaves SY1 increased by 0.96% and 0.64% compared with the CK1 and CK2 controls, respectively, and SY2 increased by 0.69% and 0.36% compared with the control, respectively. The petroleum ether extract of C3F grade tobacco leaves SY1 after curing increased by 0.92% and 0.62% compared with the CK1 and CK2 controls, respectively, and SY2 increased by 0.69% and 0.39% compared with the control, respectively. The differences between SY1, SY2 and the control reached a significant level. The petroleum ether extract of fresh tobacco leaves and C3F grade tobacco leaves after curing SY1>SY2.

[0063] Table 1 Yield of petroleum ether extracts from different experimental treatments (%)

[0064]

[0065] Note: Different letters indicate reaching the P=0.05 significance level, the same below.

[0066] ②Differences in enzyme activities related to oil synthesis:

[0067] The activity of isocitrate lyase (ICL) was enhanced, which could provide sufficient acetyl CoA as the raw material for synthesizing fatty acids. The results of ICL enzyme activity determination in fresh leaves of the same part in different treatments and at different times are shown in Table 2. The enzyme activities of treatments SY1 and SY2 at 60d, 90d, and 110d after transplanting were higher than those of the control, and the difference between treatment SY1 and the control reached a significant level.

[0068] Table 2 Isocitrate lyase activity assay results (unit: U / L)

[0069]

[0070] Glucose 6-phosphate dehydrogenase (G6PDH) is a key enzyme in the pentose phosphate metabolic pathway and can promote fat synthesis. The results of G6PDH enzyme activity determination in fresh leaves of the same part at different treatments and different periods are shown in Table 3. The enzyme activities of SY1 and SY2 in treatments 90d and 110d after transplanting were higher than those in the control, among which the difference between treatment SY1 and the control reached a significant level, and the enzyme activity of SY1 was significantly improved in each treatment.

[0071] Table 3 Results of 6-phosphogluconate dehydrogenase activity determination (unit: U / L)

[0072]

[0073] Phosphatidic acid phosphatase (PPase) has a regulatory effect on the formation of triacylglycerol. The results of PPase activity determination in fresh leaves of the same part at different treatments and different periods are shown in Table 4. The enzyme activity of SY1 in the treatments of 90d and 110d after transplanting was higher than that in the control.

[0074] Table 4 Phosphatidic acid phosphatase activity determination results (unit: U / mL)

[0075]

[0076] ③Appearance quality of C3F grade tobacco leaves:

[0077] According to the national standard for flue-cured tobacco (GB / T2635-1992), the appearance quality of C3F grade tobacco leaves with different treatments was evaluated, and the results are shown in Table 5. In terms of appearance oil content analysis, SY1 has a higher oil content. - The quantitative scores are higher than those of other treatments.

[0078] Table 5 Evaluation results of appearance quality of C3F grade tobacco leaves

[0079]

[0080] ④ Sensory evaluation of inhalation quality:

[0081] The results of sensory evaluation of single-material tobacco made from C3F grade tobacco leaves are shown in Table 6. The aroma quantity and aroma quality of SY1 and SY2 are better than those of the control, among which SY1 has the highest score. The total score of the smoking evaluation is SY1>SY2>CK2>CK1. The total score of SY1 is 1.2 points higher than that of CK1, and the sensory quality is improved.

[0082] Table 6 Sensory evaluation scores of C3F grade tobacco leaves

[0083]

[0084] In the technical scheme of the present application, according to the need of using the soil, the raw materials can also be used in weight percentage, including 0.4-1.6% fried sesame seeds, 0.4-1.6% crushed and fried soybean grains, 2-4% decomposed pure sesame cakes, 2-4% animal and plant organic fertilizers, 0.2-1% mineral potassium humate, 0.2% zinc sulfate, 0.1% borax, 0.1% copper sulfate, and 87.4-94.6% decomposed cow dung.

[0085] A special fertilizer for improving the oil content of flue-cured tobacco is prepared by mixing materials of group A and group B. Step 1 (group A): each material is weighed according to the percentage of the total weight, and eight materials including fried sesame, crushed and fried soybean grains, decomposed pure sesame cakes, animal and plant organic fertilizers, mineral potassium humate, zinc sulfate, borax, and copper sulfate are obtained respectively, and the eight materials are piled up and fully mixed; Step 2 (group B): decomposed cow dung is weighed according to the percentage of the total weight, and the decomposed cow dung is piled up; Step 3: after group A is weighed according to 9% by weight and group B is weighed according to 91% by weight, 1000 kg of the mixture of group A and group B is loaded into a horizontal forward and reverse organic fertilizer compound mixer produced by Longchang Machinery Co., Ltd. at one time, and the mixture is stirred for 30 minutes (forward and reverse rotation for 15 minutes each) and then bagged.

[0086] Application method and dosage of special fertilizer: Use a fertilizer ridging machine with a powder or granular fertilizer distributor to complete the application of the special fertilizer base fertilizer at one time. If non-mechanized manual fertilization is used, fertilize manually according to the row spacing, dig furrows and spread the fertilizer manually. The fertilizer depth is 10-15cm and the dosage is 500kg per mu. When applying this special fertilizer, adjust the dosage of inorganic fertilizer appropriately according to the total amount of nitrogen used per unit area of ​​the tobacco field.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail according to the preferred embodiments, it should be understood that the above description is only a specific implementation mode of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A special fertilizer for increasing oil content in tobacco leaves, characterized in that: The sustained-release granules are composed of component A, component B and component C, and the sustained-release granules are component A, component B and component C from the outside to the inside, component B covers component C, component A covers component B and is the shell of the sustained-release granules; The raw materials of component A, component B and component C are the same, but the amounts of the raw materials are different.

2. The special fertilizer for increasing oil content in tobacco leaves according to claim 1, characterized in that: The raw materials are composed of fried sesame, crushed and fried soybean grains, decomposed pure sesame cakes, animal and plant organic fertilizers, mineral potassium humate, zinc sulfate, borax, copper sulfate and decomposed cow dung.

3. The special fertilizer for increasing oil content in tobacco leaves according to claim 2, characterized in that: The weight percentage of each raw material in component A is: 0.4-0.6% of roasted sesame, 0.4-0.6% of crushed and roasted soybean particles, 2-2.5% of decomposed pure sesame cake, 2-2.5% of animal organic fertilizer, 0.2-0.4% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung; The weight percentage of each raw material in component B is: 0.8-1.0% of fried sesame, 0.8-1.0% of crushed and fried soybean particles, 2.8-3.2% of decomposed pure sesame cake, 2.8-3.2% of animal organic fertilizer, 0.5-0.8% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung; The weight percentage of each raw material in component C is: 1.2-1.6% of fried sesame seeds, 1.2-1.6% of crushed and fried soybean particles, 3.5-4.0% of decomposed pure sesame cakes, 3.5-4.0% of animal organic fertilizer, 1% of mineral potassium humate, 0.2% of zinc sulfate, 0.1% of borax, 0.1% of copper sulfate, and the balance is decomposed cow dung.

4. The special fertilizer for increasing oil content in tobacco leaves according to claim 1, characterized in that: The sustained-release granules are composed of 10-30% of component A, 20-40% of component B and 40-50% of component C by weight.

5. The special fertilizer for increasing oil content in tobacco leaves according to claim 1, characterized in that: In the sustained-release granules, the hardness of component A, component B and component C gradually increases.

6. A method for preparing the special fertilizer for increasing oil content in tobacco leaves according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. According to the composition of component C, corresponding raw materials are prepared and fully mixed to obtain a mixed material C; S2, using a granulator to granulate the mixed material C to obtain component C particles; S3, preparing corresponding raw materials according to the composition of component B, and fully mixing the component C particles obtained in step S2 with the raw materials of component B to obtain a mixed material B; S4, using a granulator to granulate the mixed material B to obtain composite particles; S5, preparing corresponding raw materials according to the composition of component A, and fully mixing the composite particles obtained in step S4 with the raw materials of component A to obtain a mixed material A; S6. Use a granulator to granulate the mixed material A to obtain sustained-release granules.

7. The method for preparing the special fertilizer for increasing oil content in tobacco leaves according to claim 6, characterized in that: The ratio of the granulation pressure of the granulator in step S2, the granulation pressure of the granulator in step S4, and the granulation pressure of the granulator in step S6 is 5:4:3.

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