Tobacco transplanting nutritional agent and preparation method thereof

Abstract

The invention belongs to the technical field of tobacco cultivation, and particularly relates to a tobacco transplanting nutritional agent and a preparation method thereof. The tobacco transplanting nutritional agent is prepared from the following raw materials in parts by weight: 45 to 55 parts of humic acid, 20 to 25 parts of modified shrimp and crab shell powder, 10 to 20 parts of compound fertilizer, 3 to 8 parts of nutrient, 2 to 4 parts of acetylsalicylic acid and 2 to 5 parts of seaweed extract, the modified shrimp and crab shell powder is obtained by mixing shrimp and crab shell powder, magnesium sulfate and borax, roasting at 200-350 DEG C for 2-3 hours, grinding and sieving. The nutrient solution provided by the invention can provide balanced, appropriate and sufficient nutrients for tobacco seedlings transplanted to a field after floating tobacco seedlings in a southern tobacco planting area, and is beneficial to early growth and quick germination, shortening of a rejuvenation period, promotion of growth and development of field tobacco leaves, and improvement of tobacco leaf yield, quality and benefits. The nutrient solution disclosed by the invention is wide in raw material source, low in price, wide in source, low in price and convenient to purchase.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco cultivation, and particularly relates to a tobacco transplanting nutrient agent and a preparation method thereof. Background Art

[0002] In the tobacco-growing areas in the south, the tobacco transplanting season is often in a low temperature, low light and rainy environment. The low temperature time in the early stage of field growth after tobacco transplanting is relatively long. At the same time, since the existing flue-cured tobacco production generally adopts the floating tobacco seedling technology to cultivate tobacco seedlings, the flue-cured tobacco seedlings cultivated under this technology have underdeveloped root systems, low root vitality, poor stress resistance, and often grow slowly after transplanting, with a long seedling acclimatization period and low uniformity of growth and development, which affects the high-yield, high-quality and efficient production of tobacco. In addition, in the existing flue-cured tobacco production, although nutrients are applied in combination with rooting water during transplanting, the nutrients used are mostly nitrogen and potassium mineral nutrients with a single composition, which is difficult to meet the needs of tobacco seedling growth and development after transplanting.

[0003] Prior art CN 114455996 A discloses a special seaweed biofertilizer for tobacco, including 26-35 parts of rapeseed cake fertilizer, 3-6 parts of seaweed fermentation products with biological activity, 18-22 parts of nitrogen fertilizer, 13-20 parts of phosphate fertilizer, 16-22 parts of potash fertilizer, 2-3 parts of silane coupling agent, 1-2 parts of polyaspartic acid, 0.5-2.5 parts of medium and trace elements and 0.5-1 part of roasted shell powder; the seaweed biofertilizer is crushed, mixed into water fertilizer, and then irrigated to the root part of tobacco through a special fertilization device. The biofertilizer of the invention adds a large amount of nutrients, medium and trace nutrients, and active seaweed components required for tobacco growth. On the one hand, it can improve the fertility of the soil and conserve arable land. On the other hand, it can also improve the stress resistance of tobacco, reduce the occurrence of diseases and insect pests, reduce the application of pesticides, and ensure the yield and quality of tobacco and the improvement of arable land quality. At the same time, with the special fertilization device of the present invention, it can achieve a significant effect of reducing labor and cost. However, the invention essentially provides a biological fertilizer for soil fertilization to enhance tobacco production, but it cannot solve the problems of secondary infection caused by root damage and seedling damage during tobacco seedling transplanting, and the active ingredients that promote root growth and rapid growth after transplanting.

[0004] Prior art CN 104341244 A relates to an organic nutrient regulator for tobacco and a preparation method thereof, characterized in that it is prepared from the following raw materials in parts by weight: 6-15 parts of potassium humate, 1-6 parts of chitosan, 1-6 parts of alginic acid, 10-20 parts of urea, 15-25 parts of potassium dihydrogen phosphate, 25-35 parts of potassium nitrate, 1-7 parts of borax, 3-8 parts of zinc sulfate heptahydrate, 0.5-3 parts of ferrous sulfate heptahydrate, 0.5-2.5 parts of sodium dodecyl sulfate, 5-10 parts of sodium ethylenediaminetetraacetate and 100 parts of water. The nutrient regulator has comprehensive nutritional components, and the proportion of nutrient elements is more suitable for tobacco growth needs. The nutrient elements are well absorbed by tobacco, and it does not contain artificially synthesized plant nutrient regulators. It is friendly to crops and the environment, and can improve tobacco's drought resistance, cold resistance, disease resistance and tobacco leaf quality. Although the invention can provide the nutrients required by tobacco, the sodium dodecyl sulfonate and sodium ethylenediaminetetraacetate used therein are easily enriched and decomposed in the soil, causing secondary pollution, and are not suitable for application in the soil. Summary of the invention

[0005] The purpose of the present invention is to provide a tobacco transplanting nutrient agent for promoting the survival rate of transplanted tobacco seedlings and a preparation method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A tobacco transplanting nutrient comprises the following raw materials in parts by weight: 45-55 parts of humic acid, 20-25 parts of modified shrimp and crab powder, 10-20 parts of compound fertilizer, 3-8 parts of nutrients, 2-4 parts of acetylsalicylic acid, and 2-5 parts of seaweed extract; the modified shrimp and crab powder is prepared by mixing shrimp and crab powder, magnesium sulfate, and borax, roasting the mixture at 200-250°C for 2-3h, and then grinding and sieving the mixture.

[0008] The present invention utilizes high temperature conditions to promote slight denaturation of proteins in shrimp and crab shell powder, which is broken down into small-molecule polypeptides or amino acids, and can significantly promote the growth of tobacco roots, while ensuring that chitosan is not broken down to affect the growth-promoting ability of chitosan; the porous structure formed by the shrimp and crab shell powder and its small-molecule substances provide attachment positions and binding sites for dehydrated magnesium sulfate and borax.

[0009] If the calcination temperature is too high, chitosan will easily break down into small molecules, losing its original function of promoting the growth of tobacco roots; if the temperature is too low, it will not be conducive to the denaturation and slight cracking of proteins in shrimp and crab powder, and the purpose of modification cannot be achieved.

[0010] Similarly, calcination time that is too long or too short will affect the calcination effect.

[0011] In one of the preferred embodiments, the tobacco transplanting nutrient agent comprises the following raw materials in parts by weight: 50 parts of humic acid, 22.5 parts of modified shrimp and crab powder, 15 parts of compound fertilizer, 6 parts of nutrients, 3 parts of acetylsalicylic acid, and 3 parts of seaweed extract.

[0012] In one preferred embodiment, shrimp and crab powder, magnesium sulfate and borax are mixed in a mass ratio of (2-3):(1-2):(1-2).

[0013] Magnesium and boron are both trace elements. Adding too much will easily cause secondary pollution. And it exceeds the load range of shrimp and crab shell powder. Taking the porous structure and small molecules formed by 1 part of shrimp and crab shell powder as an example, its load capacity corresponds to 1 part of magnesium or boron. Adding too little will affect the growth of plants.

[0014] In one of the preferred embodiments, the shrimp and crab powder is obtained from kitchen waste crayfish and hairy crab shells, which are degreased, rinsed, dried and crushed at 40-50°C.

[0015] In one preferred embodiment, the particle size of the modified shrimp and crab meal obtained after sieving is 40-50 nanometers.

[0016] In one preferred embodiment, the magnesium sulfate is magnesium sulfate heptahydrate MgSO4·7H2O.

[0017] In one preferred embodiment, the borax is borax hydrate Na2B4O7.10H2O.

[0018] In one preferred embodiment, the vitamins include 2-3 parts of V-B6 and 2-3 parts of V-B12.

[0019] In one preferred embodiment, the compound fertilizer is a compound fertilizer containing N, P, and K elements; in the compound fertilizer, the molar ratio of N:P2O5:K2O is (15-20):(15-20):(15-20).

[0020] In one preferred embodiment, the preparation process of the seaweed extract comprises: defatting the seaweed powder, extracting it with petroleum ether at room temperature for 10-15 hours, and obtaining it by centrifugation.

[0021] In one preferred embodiment, the preparation process of the seaweed extract comprises:

[0022] Step 1: Weigh 100 g of seaweed powder, add 5 times the weight of anhydrous ethanol to the seaweed powder, mix well, reflux and degrease in a 65°C water bath for 30 minutes, filter with gauze, and take the residue;

[0023] Step 2: Weigh 30 g of the filter residue, add petroleum ether at a material ratio of 1:20 (g / mL), stir and extract at 25°C for 12 hours at a stirring speed of 100 rpm, and then centrifuge at 4500 rpm for 10 minutes, collect the supernatant A, and obtain the extract.

[0024] Based on the same invention, the present invention also claims a method for preparing the tobacco transplanting nutrient, comprising the following steps:

[0025] Mix humic acid, modified shrimp and crab shell powder and compound fertilizer evenly to obtain component 1 for later use;

[0026] The nutrients, acetylsalicylic acid and seaweed extract are uniformly mixed and then added into component 1, and mixed to obtain the tobacco transplanting nutrient.

[0027] Based on the same invention, the present invention also claims to protect the application of the tobacco transplanting nutrient, including: diluting the tobacco transplanting nutrient with clean water by 400-600 times and using it for tobacco seedling transplanting.

[0028] In a preferred embodiment, the tobacco seedlings are grown into mature tobacco seedlings and transplanted into the field.

[0029] In a preferred embodiment, the tobacco transplanting nutrient agent is diluted 500 times with clean water and then applied to the roots of tobacco seedlings.

[0030] At present, in the tobacco-growing areas in southern my country, the tobacco seedlings cultivated by floating seedling cultivation have underdeveloped root systems, low root vitality, and poor stress resistance. The early spring transplanting season is often in an early spring low-temperature, low-light, and rainy environment. At the same time, the existing nutrient fertilizers applied after flue-cured tobacco transplanting are mostly single nutrients containing nitrogen and potassium. This results in slow growth and development of the tobacco seedlings after transplanting, and a relatively long seedling acclimatization period. To this end, the present invention provides a multifunctional nutrient that has both a regulating function, comprehensive mineral nutrients, and appropriate nutrient content, and can promote root growth and development and improve the stress resistance of tobacco seedlings, so as to solve the problems in the existing tobacco production and transplanting links.

[0031] The nutrient solution of the present invention is poured on the tobacco after transplanting and rooting, wherein humic acid, as the main source of organic matter, combines with clay minerals in the soil to form a stable soil aggregate structure, increase the porosity of the soil, improve the air permeability and drainage of the soil, and promote microbial activity; and the humic acid and the porous structure formed by the modified shrimp and crab shell powder and its small molecular substances, chitosan, calcium and the magnesium and boron carried thereon promote the growth and development of the tobacco seedling root system, promote the amino acid metabolism and protein synthesis of the tobacco seedling, and contribute to the growth and stress resistance of the plant. VB6 and VB12 work together to promote the photosynthesis and nucleic acid synthesis of the plant, enhance the metabolic activity and stress resistance of the plant, and improve the growth rate and disease resistance. On the one hand, acetylsalicylic acid can improve the stress resistance of the plant, reduce the occurrence of diseases, and promote growth and development. At the same time, it is used in conjunction with seaweed extract, which is rich in plant hormones (such as cytokinins, gibberellins) and various trace elements, enhances the disease resistance and stress resistance of the plant, and improves the overall growth state.

[0032] In summary, the nutrient solution of the present invention provides comprehensive and sufficient nutrients for the growth and development of tobacco seedlings after transplanting, promotes root growth, achieves early growth and rapid development, and promotes tobacco leaf production.

[0033] The significant effects of the present invention are:

[0034] (1) The nutrient solution of the present invention can provide balanced, appropriate and sufficient nutrients for tobacco seedlings that are transplanted to the field after floating in the tobacco-growing areas in the south, which is conducive to early growth and rapid development, shortens the seedling acclimatization period, promotes the growth and development of tobacco leaves in the field, and improves the yield, quality and efficiency of tobacco leaves.

[0035] (2) The raw materials of the nutrient solution of the present invention are widely available and inexpensive, and are easy to purchase.

[0036] (3) The preparation method of the nutrient solution of the present invention is simple and easy. After the components are mixed, they can be prepared by uniformly mixing with clean water according to the mass ratio. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] The experiment was conducted at a tobacco station experimental base in Linli County, Changde City.

[0040] The experimental flue-cured tobacco was Yunyan 87, which was sown on December 25, 2022. The flue-cured tobacco seedlings sown at the same time and cultivated in the same floating tobacco seedling pool were selected and transplanted to the field on March 21, 2023. The transplanting density was 0.5 meters plant spacing × 1.2 meters row spacing, and the area was 12.5 × 2 = 25 mu; the final harvest was on July 20, 2023. The tobacco leaf baking room is a standard intensive airflow rising room, which adopts the medium temperature and medium humidity three-stage baking technology for baking. Other cultivation techniques and management measures are carried out in accordance with the local high-quality tobacco production technical measures.

[0041] The experimental design has two treatments:

[0042] Treatment 1: When watering the roots on the day of transplanting, apply the nutrient agent of the present invention at a concentration of 500 times;

[0043] Control: When watering the roots on the day of transplanting, the nutrient agent of the present invention was not applied, but a 45% (15% each of nitrogen, phosphorus and potassium) compound fertilizer of the same concentration as treatment 1 was applied;

[0044] Treatment 2 (mixing shrimp and crab shell powder, magnesium sulfate and borax directly according to the mass ratio without roasting);

[0045] Treatment 3 (roasting shrimp and crab shell powder and magnesium sulfate according to the mass ratio without adding borax);

[0046] Treatment 4 (roasting shrimp and crab shell powder and borax according to the mass ratio without adding magnesium sulfate);

[0047] Treatment 5 (roasting magnesium sulfate and borax according to the mass ratio without adding shrimp and crab shell powder);

[0048] Treatment 6 (replacing the modified shrimp and crab shell powder with roasted shell powder, the roasted shell powder is obtained by roasting the shells at 800° C. for 2 h, crushing them, and passing them through a 40-mesh sieve);

[0049] Treatment 7 (without acetylsalicylic acid);

[0050] Treatment 8 (without seaweed extract).

[0051] The nutrient agent (treatment 1) of this embodiment includes: 50 parts of humic acid, 17.5 parts of modified shrimp and crab meal, 15 parts of compound fertilizer; 3 parts each of VB6 and VB12, 3 parts of acetylsalicylic acid, and 3.5 parts of seaweed extract; the modified shrimp and crab meal is prepared by mixing shrimp and crab meal, magnesium sulfate, and borax in a mass ratio of 2:1:1, heating to 200°C, keeping the temperature and roasting for 2h, grinding with a ball mill, and sieving to obtain a powder of 40-50nm, which is the modified shrimp and crab meal.

[0052] The humic acid is agricultural potassium humate, and the shrimp and crab meal is made by washing and degreasing the kitchen waste crayfish and hairy crabs, drying and crushing them at 40-50°C. The magnesium sulfate is magnesium sulfate heptahydrate MgSO4·7H2O. The borax is borax hydrate Na2B4O7.10H2O. The compound fertilizer is a ternary compound fertilizer containing 45% of N, P, and K elements (15% each of nitrogen, phosphorus, and potassium) (for example, purchased from Shaoxing Kenong Compound Fertilizer Co., Ltd.). VB6 and VB12 are tablets of 20 mg / tablet, and acetylsalicylic acid is tablets of 0.5 g / tablet. The preparation process of seaweed extract includes: step 1: weighing 100g of seaweed powder, adding anhydrous ethanol in an amount 5 times the weight of the seaweed powder, mixing evenly, reflux degreasing in a water bath at 65°C for 30 minutes, filtering with gauze, and taking the filter residue; step 2: weighing 30g of the filter residue, adding petroleum ether at a material ratio of 1:20 (g / mL), stirring and extracting at 25°C for 12 hours, the stirring speed is 100 rpm, and then centrifuging at 4500 rpm for 10 minutes, collecting supernatant A, and obtaining the seaweed extract.

[0053] First, respectively, mix the following: 1) main ingredients: 50 parts by weight of humic acid, 17.5 parts by weight of modified shrimp and crab powder, and 15 parts by weight of compound fertilizer; 2) functional substances: 3 parts by weight each of VB6 and VB12, 3 parts by weight of acetylsalicylic acid, and 3.5 parts by weight of seaweed extract, and then mix the two major types of substances evenly, and then prepare a nutrient solution with a liquid concentration of 500 times with clean water. According to the experimental design, rooting water is applied on the day after transplanting.

[0054] Main test items for field and flue-cured tobacco leaves:

[0055] 1) Records of the main growth periods in the field

[0056] With reference to the YC / T142-2010 standard, the main growth periods of the field with different treatments after transplanting are recorded as "transplanting period, seedling acclimatization period, plant clustering period, vigorous growth period, maturity period (lower, middle, upper), and final harvesting period."

[0057] 2) Root volume and activity 7 days after topping

[0058] For each treatment, 3×3=9 tobacco seedlings with basically the same growth were taken, all of which were dug out with roots, and then washed clean with a net bag. 35g of fine roots were taken and the root activity was determined by the TTC method; the root volume was determined by the drainage method.

[0059] 3) Determination of main agronomic traits

[0060] 7 days after transplanting and topping, 10×3=30 tobacco plants with basically consistent growth and development were selected for each treatment, and the plant height, maximum leaf length and width were measured, and the leaf area was calculated according to the formula “length×width×0.6345”.

[0061] 4) Evaluation of the appearance quality of flue-cured tobacco leaves

[0062] Each treatment takes 1.5kg of tobacco samples of three grades of "X2F, C3F, B2F" after baking, and 3 samples of tobacco samples of each treatment grade are taken to evaluate the tobacco leaf appearance quality indicators. For any of the five appearance quality indicators of "maturity, leaf structure, identity, oil content, and color", according to the highest score of 20 points (the larger the score, the better the appearance quality of the tobacco sample), 5 relevant technical experts are organized to conduct on-site evaluation and scoring, and then the total score of each indicator is calculated.

[0063] 5) Sensory quality evaluation of flue-cured tobacco leaves

[0064] For each treatment, 1.5 kg of tobacco leaf samples of three grades of "X2F, C3F, B2F" after curing were taken. Three samples of tobacco leaf samples of each treatment grade were taken. For any of the seven sensory quality indicators of "aroma quality, aroma quantity, miscellaneous smell, irritation, aftertaste, concentration, and strength", according to the quality evaluation standards in Table 1 (the larger the score, the better the appearance quality of the tobacco sample), 5 relevant technical experts were organized to conduct on-site evaluation and scoring, and then the total score of each indicator was calculated.

[0065] Table 1 Tobacco leaf smoking (sensory) quality indicators and standards

[0066]

[0067] Note: The indicators “+” and “-” indicate that the quality is slightly higher or lower, or the change trend is slightly larger or smaller.

[0068] 6) Determination of main economic characteristics of flue-cured tobacco leaves

[0069] After each processed tobacco leaf matures, it is harvested separately, numbered and bundled into stalks, and then cured in the same curing room. The cured tobacco leaves are graded according to the national tobacco grading standards (GB2635-92), and the proportion of each processed tobacco grade is calculated. The average unit price and total output value of the tobacco leaves are calculated based on the purchase price of each grade of tobacco leaves in that year (including subsidies).

[0070] The results are as follows:

[0071] Table 2 Main growth period of field in different treatments

[0072]

[0073] The results show that: (1) Compared with the control, after being treated with the nutrient solution of the present invention, the seedling growth period was advanced by 4 days, the clustering period was advanced by 4 days, and the vigorous growth period was advanced by 5 days; the maturity period of the lower, middle, and upper tobacco leaves was advanced by 4 days, 5 days, and 4 days, respectively (Table 2). Using less nutrient solution of the present invention or changing the treatment method can also shorten the seedling growth period by 2-3 days, but replacing modified shrimp and crab shell powder or not adding shrimp and crab shell powder does not shorten the seedling growth period. Therefore, after the nutrient solution of the present invention is treated with rooting water, it is beneficial to promote the growth and development of field tobacco plants after transplanting, accelerate the growth and development process of tobacco leaves, and promote the maturity of tobacco leaves.

[0074] Table 3 Root volume and activity of tobacco plants in different treatments 7 days after topping

[0075]

[0076] (2) Compared with the control, after being treated with the nutrient solution of the present invention, the root volume of the tobacco plants increased by 10.37% and reached 243.7 cm 7 days after topping. 3 ; Root activity increased by 10.38%, reaching 324.4ug / g / h FW; The treatment was significantly higher than the control. The effect of less use of the nutrient solution of the present invention or changing the treatment method on the root volume is not significant, but replacing the modified shrimp and crab shell powder or not adding shrimp and crab shell powder, the root volume is significantly reduced by 0.5-1.4%; The difference between the root activities is not significant, and the treatment with replacing the modified shrimp and crab shell powder or not adding shrimp and crab shell powder is the lowest. Therefore, after the nutrient solution of the present invention is treated with root watering, it is beneficial to promote the growth and development of the roots of field tobacco plants after transplanting, increase the root volume, and improve the root activity, that is, it promotes the absorption of nutrients and water by the roots, which is beneficial to the growth and development of tobacco leaves and mature harvesting.

[0077] Table 4 Main agronomic traits of different treatments 7 days after topping in the field

[0078]

[0079] (3) Compared with the control, after treatment with the nutrient solution of the present invention, the main agronomic traits of tobacco plants 7 days after topping, "plant height, maximum leaf length, maximum leaf width, maximum leaf area", increased by 6.36%, 3.51%, 5.14% and 8.83% respectively; the leaf area of ​​the treated tobacco leaves was significantly higher than that of the control. This shows that the nutrient solution of the present invention, after rooting watering, is beneficial to promote the growth and development of field tobacco plants after transplanting and improves the main agronomic traits.

[0080] Table 5 Evaluation of appearance quality of tobacco leaves treated with different methods

[0081]

[0082] (4) Compared with the control, after being treated with the nutrient solution of the present invention, the total scores of the appearance quality indicators of the post-cured tobacco leaves in treatment 1, "maturity, leaf structure, identity, oil content, and chromaticity", were as follows: C3F tobacco leaves were 51.99, 5.03% higher than the control; but there were no significant differences among the treatments. Using less nutrient solution of the present invention or changing the treatment method improved the appearance quality of tobacco leaves by 3.19-3.74%, and the treatment with replacing modified shrimp and crab shell powder or not adding shrimp and crab shell powder was the lowest, at 2.16-2.34%. This shows that after being treated with the nutrient solution of the present invention, the growth and development process was accelerated due to the improvement of the early nutritional environment, which promoted the growth and development of tobacco leaves and mature harvesting, thereby improving the appearance quality of the post-cured tobacco leaves.

[0083] Table 6 Sensory quality evaluation of tobacco leaves treated with different methods

[0084]

[0085] (5) Compared with the control, after being treated with the nutrient solution of the present invention, the total score of the evaluation of the appearance quality indicators of the tobacco leaves after baking, "aroma quality, aroma quantity, miscellaneous odor, irritation, aftertaste, concentration, and strength", for C3F tobacco leaves in treatment 1 was 55.8, which was 6.0% higher than the control. Using less nutrient solution of the present invention or changing the treatment method improved the appearance quality of tobacco leaves by 4.7-4.9%, and the treatment with replacing modified shrimp and crab shell powder or not adding shrimp and crab shell powder was the lowest, at 1.8-2.7%. This shows that after being treated with the nutrient solution of the present invention, the early nutritional environment is improved, the growth and development process is accelerated, the growth and development of tobacco leaves and mature harvesting are promoted, and the sensory quality of the tobacco leaves after baking is improved.

[0086] Table 9 Main economic characteristics of different treatments

[0087]

[0088] (6) Compared with the control, after being treated with the nutrient solution of the present invention, the yield, proportion of high-quality tobacco leaves, average price and output value of treatment 1 after curing were improved to varying degrees, and the output value was 5.25% higher than that of the control, with obvious effects, but without significant differences. The nutrient solution of the present invention used less or changed the treatment method to improve the appearance quality of tobacco leaves by 3.2-4.1%, and the treatment with replacement of modified shrimp and crab shell powder or no addition of shrimp and crab shell powder was the lowest, at 0.6-2.1%. This preliminarily shows that after being treated with the nutrient solution of the present invention, the early nutritional environment is improved, the growth and development process is accelerated, the growth and development of tobacco leaves and mature harvesting are promoted, the quality of cured tobacco leaves is improved, and the main economic traits of tobacco leaves are improved, and the output value is increased.

[0089] Therefore, compared with the prior art, the beneficial effects of the present invention are as follows: the humic acid and the porous structure formed by the modified shrimp and crab shell powder and its small molecular substances, chitosan, calcium, magnesium and boron in the present invention work together to promote the growth and development of the root system of tobacco seedlings; VB6, VB12, acetylsalicylic acid and seaweed extracts (such as cytokinins and gibberellins) work together to promote photosynthesis and nucleic acid synthesis of plants, enhance the metabolic activity and stress resistance of plants, improve growth rate and disease resistance, achieve root promotion and disease resistance complement each other, promote the growth and development of tobacco seedlings, and improve the overall growth state. The nutrient solution of the present invention can provide balanced, appropriate and sufficient nutrition for tobacco seedlings transplanted to the field after floating tobacco seedlings in the southern tobacco planting area, which is conducive to early growth and rapid development, shortens the seedling acclimatization period, promotes the growth and development of tobacco leaves in the field, and improves the yield, quality and efficiency of tobacco leaves.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tobacco transplanting nutrient, characterized in that: The invention comprises the following raw materials in parts by weight: 45-55 parts of humic acid, 20-25 parts of modified shrimp and crab shell powder, 10-20 parts of compound fertilizer, 3-8 parts of nutrients, 2-4 parts of acetylsalicylic acid and 2-5 parts of seaweed extract; the modified shrimp and crab shell powder is prepared by mixing shrimp and crab shell powder, magnesium sulfate and borax, roasting the mixture at 200-250 DEG C for 2-3 hours, and then grinding and sieving the mixture to obtain the modified shrimp and crab shell powder.

2. The tobacco transplanting nutrient according to claim 1, characterized in that: The tobacco transplanting nutrient comprises the following raw materials in parts by weight: 50 parts of humic acid, 22.5 parts of modified shrimp and crab powder, 15 parts of compound fertilizer, 6 parts of nutrients, 3 parts of acetylsalicylic acid, and 3 parts of seaweed extract.

3. The tobacco transplanting nutrient according to claim 1, characterized in that: Shrimp and crab shell powder, magnesium sulfate and borax are mixed in a mass ratio of (2-3):(1-2):(1-2).

4. The tobacco transplanting nutrient according to claim 1, characterized in that: Shrimp and crab powder is obtained from kitchen waste crayfish and hairy crab shells, which are degreased, rinsed, dried and crushed at 40-50℃.

5. The tobacco transplanting nutrient according to claim 1, characterized in that: Vitamins include 2-3 parts of V-B6 and 2-3 parts of V-B12.

6. The tobacco transplanting nutrient according to claim 1, characterized in that: Compound fertilizer contains N, P, Compound fertilizer of K element; in the compound fertilizer, the molar ratio of N:P2O5:K2O is (15-20):(15-20): (15-20)。 7. The tobacco transplanting nutrient according to any one of claims 1 to 6, characterized in that: The seaweed extract is obtained by defatting seaweed powder, extracting with petroleum ether at room temperature for 10-15 hours, and centrifuging.

8. The method for preparing the tobacco transplanting nutrient according to any one of claims 1 to 7, characterized in that: The following steps are involved: Mix humic acid, modified shrimp and crab meal, and compound fertilizer evenly to obtain component 1 for later use; The nutrients, acetylsalicylic acid and seaweed extract are uniformly mixed and then added into component 1, and mixed to obtain the tobacco transplanting nutrient.

9. The use of the tobacco transplanting nutrient according to any one of claims 1 to 7, characterized in that: include: The tobacco transplanting nutrient agent is diluted with clean water by 400-600 times and then used for tobacco seedling transplanting.

10. The use according to claim 9, characterized in that: The tobacco seedlings are those that are transplanted into the field after they have matured into seedlings.

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