A foliar fertilizer and its application method for improving the combustibility of cigar tobacco leaves

Abstract

This invention relates to a foliar fertilizer and its application method for improving the combustibility of cigar tobacco leaves. The foliar fertilizer comprises the following components by weight percentage: 0.3%–0.7% amino acid magnesium fertilizer, 0.03%–0.07% seaweed extract, 0.04%–0.07% boron fertilizer, 0.02%–0.07% zinc fertilizer, 0.02%–0.04% molybdenum fertilizer, and the balance being water. This invention's foliar fertilizer, with magnesium as the main component and the addition of boron, zinc, molybdenum, and the natural active substance seaweed extract, constitutes a foliar fertilizer that improves the combustibility of cigar tobacco leaves. Through the combined action of these substances, it effectively improves the combustibility of tobacco leaves and increases the yield of high-quality tobacco. Therefore, the foliar fertilizer and its application method provided by this invention can effectively improve the overall combustion performance of cigar tobacco leaves, promote complete combustion, and simultaneously increase production value.

Description

Technical Field

[0001] This invention relates to the field of fertilizer technology, specifically to a foliar fertilizer and application method for improving the combustibility of cigar tobacco leaves. Background Technology

[0002] Cigars are a typical leaf-based economic crop and a special tobacco product. They are loved by many smokers for their richer aroma and stronger flavor, and cigar sales have been rising year by year. However, there is currently a shortage of high-quality raw materials. This is mainly because some cigars have problems such as black ash, incomplete combustion, and poor combustibility during the burning process. Therefore, improving the yield and quality of cigars and enhancing their market competitiveness has become an urgent task to improve the economic benefits of cigar cultivation.

[0003] Currently, some studies on improving the combustibility of tobacco leaves involve adding substances to the leaves after harvest (such as spraying plant extracts, pectinase, α-amylase, or glycerol before cigar tobacco fermentation) to alter the content of internal chemical substances, thereby improving cigar quality or combustibility. While these methods have some effect, they can compromise the natural aroma and flavor of the cigar tobacco leaves and are time-consuming and labor-intensive. Compared to adding substances after harvest to improve combustibility, controlling the content of chemical substances in tobacco leaves through specific management techniques during field production is a greener, safer, and more convenient method. Studies have shown a positive correlation between magnesium content in tobacco leaves and combustibility, with beneficial effects on aroma, aftertaste, off-flavors, and irritation. In studies on improving the combustibility of cigar tobacco leaves in actual field production, some scholars have conducted research on the application of calcium, magnesium, and sulfur fertilizers as basal fertilizers to investigate the effects of these three elements on the quality and combustibility of cigar tobacco leaves. They found that the application of magnesium can effectively improve the proportion of chemical substances in tobacco leaves and has the best effect on improving the combustibility of tobacco leaves, while sulfur has a significant negative impact on the combustibility of tobacco leaves.

[0004] Therefore, one method to regulate the chemical content of tobacco leaves is fertilization. However, soil nutrient content varies in different regions. Although most areas in China currently lack magnesium, applying magnesium fertilizer directly without conducting experiments on its application could have negative effects, leading to reduced tobacco quality and yield, thus impacting local farmers' income and government tax revenue. Cigars, as a leaf-based economic crop, are harvested primarily from the leaves, and foliar fertilizers are the most direct agents affecting them. Furthermore, foliar fertilizers have low nutrient content, and when nutrients are not excessive, they rarely cause reduced crop quality or yield. Therefore, a foliar fertilizer that can improve the combustibility of cigar tobacco leaves is urgently needed in cigar tobacco production in the field. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a foliar fertilizer and fertilization method to improve the combustibility of cigar tobacco leaves, thereby solving the technical problem of poor combustibility of tobacco leaves in the prior art.

[0006] To achieve the above-mentioned technical objectives, the technical solution provided by this invention is as follows:

[0007] In a first aspect, the present invention provides a foliar fertilizer for improving the combustibility of cigar tobacco leaves, the foliar fertilizer comprising the following components by weight percentage: 0.3% to 0.7% amino acid magnesium fertilizer, 0.03% to 0.07% seaweed extract, 0.04% to 0.07% boron fertilizer, 0.02% to 0.07% zinc fertilizer, 0.02% to 0.04% molybdenum fertilizer, and the balance being water.

[0008] Secondly, the present invention provides a method for applying the above-mentioned foliar fertilizer for improving the combustibility of cigar tobacco leaves, comprising the following steps: spraying the foliar fertilizer onto the leaves of cigar tobacco plants, wherein the spraying time is: the first spraying is carried out during the crowning stage of the cigar tobacco plants, and the second spraying is carried out during the vigorous growth stage; wherein, the crowning stage of the cigar tobacco plants is 28 to 33 days after transplanting and survival, and the vigorous growth stage is 45 to 55 days after transplanting and survival.

[0009] Compared with the prior art, the beneficial effects of the present invention include:

[0010] This invention relates to a foliar fertilizer that uses magnesium as the main component, supplemented with boron, zinc, molybdenum, and the natural active substance seaweed extract, to improve the combustibility of cigar tobacco leaves. Magnesium, a component of the amino acid magnesium, is a crucial component of chlorophyll in chloroplasts and also an important signaling molecule regulating the diurnal cycle of plants (Mg). 2+ The magnesium provided by foliar spraying can effectively promote plant photosynthetic efficiency, photosynthetic carbon assimilation, and the transport and utilization of photosynthetic products, facilitating the translocation of substances between the aboveground and underground parts. Spraying boron, zinc, and molybdenum fertilizers can provide exogenous zinc, boron, and molybdenum to the leaves, promoting the activation of carbonic anhydrase and the synthesis of chlorophyll and auxin in plants. This can improve the photosynthetic performance of tobacco, increase nitrogen accumulation rate, enhance tobacco aroma, and reduce the formation of ash and discolored tobacco. Seaweed extract, a natural active substance, can promote the penetration of foliar fertilizer into cigar tobacco leaves and prolong its adhesion time, promoting the absorption of nutrients from the foliar fertilizer, improving the metabolic level of tobacco plants, enhancing their stress resistance, and reducing the risk of leaf burn from foliar fertilizer. With the combined effect of these substances, the combustibility of tobacco leaves is effectively improved, increasing the yield of high-quality tobacco. Therefore, the foliar fertilizer and fertilization method provided by this invention can effectively improve the overall combustion performance of cigar tobacco leaves, promote complete combustion, and increase production value. Attached Figure Description

[0011] Figure 1These are the TG curves (left side) and DTG curves (right side) of the cigar tobacco leaves processed according to the present invention.

[0012] Figure 2 This is a partial enlarged view of the TG curve (left image) and DTG curve (right image) of the cigar tobacco leaves processed according to the present invention;

[0013] Figure 3 This is a schematic diagram illustrating the determination of the combustion initiation temperature and burnout temperature of tobacco leaves using the TG-DTG joint definition method. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0015] This invention provides a foliar fertilizer and application method for improving the combustibility of cigar tobacco leaves. The foliar fertilizer has good solubility, a reasonable formula, high fertilizer utilization rate, and a simple application method. By promoting the absorption of magnesium and other trace elements by tobacco leaves, it helps regulate the nutritional balance of plants, promotes photosynthesis in leaves, and controls the content of chemical components in tobacco leaves, thereby increasing the yield and quality of cigar tobacco leaves and improving their combustibility. Furthermore, the addition of natural active substance seaweed extract can increase the amount and duration of foliar fertilizer adhering to the leaf surface, promote the absorption of foliar fertilizer through the leaf biofilm and on the leaf surface, enhance fertilizer efficiency, and simultaneously enhance the stress resistance of tobacco plants.

[0016] In a first aspect, the present invention provides a foliar fertilizer for improving the combustibility of cigar tobacco leaves, comprising the following components by weight percentage: 0.3% to 0.7% amino acid magnesium fertilizer, 0.03% to 0.07% seaweed extract, 0.04% to 0.07% boron fertilizer, 0.02% to 0.07% zinc fertilizer, 0.02% to 0.04% molybdenum fertilizer, and the balance being water.

[0017] Preferably, the amino acid magnesium fertilizer contains more than 60% amino acid magnesium, with the remainder being amino acids.

[0018] Further preferred amino acid types include common amino acid chelated fertilizers such as glycine, leucine, aspartic acid, glutamic acid, or lysine.

[0019] The amino acid magnesium fertilizer of this invention is composed of amino acid magnesium and amino acids, with the amino acid magnesium content exceeding 60%, and the remainder being amino acids. This invention provides amino acids and amino acid magnesium through the amino acid magnesium fertilizer product, with amino acid magnesium being the primary component. The amino acid magnesium selected in this invention is a chelated magnesium. Magnesium is an important component of chlorophyll in tobacco chloroplasts and also an important signaling substance regulating the diurnal cycle of plants (Mg).2+ Magnesium can effectively promote photosynthetic efficiency, assimilation of photosynthetic carbon, and transport and utilization of photosynthetic products, facilitating the translocation of substances between the aboveground and underground parts. Spraying exogenous magnesium can improve the diurnal rhythm of tobacco plants, enhance photosynthesis, promote the translocation of carbohydrates between the aboveground and underground parts, regulate the content of chemical substances in leaves, and improve quality.

[0020] This invention does not have any special requirements for the manufacturers of the above-mentioned amino acid magnesium fertilizers; products produced by manufacturers well known to those skilled in the art can be used.

[0021] Preferably, boron fertilizer includes boric acid or sodium borate. The boron provided to the leaves by boric acid or sodium borate promotes tobacco plant growth and dry matter accumulation, harmonizes the chemical composition of tobacco leaves, and improves the aroma and flavor of tobacco leaves.

[0022] Preferably, the zinc fertilizer includes zinc sulfate. Zinc sulfate can provide exogenous zinc to the leaves, promote the activation of carbonic anhydrase and the synthesis of chlorophyll and auxin, improve the photosynthetic performance of tobacco, promote the growth of stems and leaves, has good water solubility, and has no adverse effects on tobacco.

[0023] Preferably, the molybdenum fertilizer includes ammonium molybdate or sodium molybdate. Ammonium molybdate or sodium molybdate can promote the rate of nitrogen accumulation and photosynthesis in tobacco plants, enhance the aroma of tobacco leaves, and reduce the formation of ash-like and discolored tobacco.

[0024] There are no special restrictions on the source of the aforementioned boron fertilizer, zinc fertilizer, and molybdenum fertilizer; conventional commercially available products are sufficient.

[0025] The source of seaweed extract in the above-mentioned foliar fertilizer is not specifically limited; any conventional commercially available product can be used. In this invention, the addition of seaweed extract can reduce the surface tension of water, prolong the adhesion time of the foliar fertilizer, promote the absorption of nutrients in the foliar fertilizer by tobacco leaves, improve the metabolic level of tobacco plants, enhance the stress resistance of tobacco plants, and reduce the risk of leaf burn caused by foliar fertilizer.

[0026] There are no special restrictions on the source of water for the above-mentioned foliar fertilizers, but farmland water that meets national standards is preferred.

[0027] Preferably, the composition includes the following components by weight percentage: 0.3%–0.5% magnesium amino acids, 0%–0.2% amino acids, 0.04%–0.06% seaweed extract, 0.05%–0.06% boron fertilizer, 0.03%–0.07% zinc fertilizer, 0.02%–0.04% molybdenum fertilizer, and the balance being water.

[0028] Preferably, the composition includes the following components by weight percentage: 0.3%–0.35% magnesium amino acids, 0.01%–0.2% amino acids, 0.04%–0.06% seaweed extract, 0.05%–0.06% boron fertilizer, 0.03%–0.07% zinc fertilizer, 0.02%–0.04% molybdenum fertilizer, and the balance being water.

[0029] Preferably, the composition includes the following components by weight percentage: 0.325% magnesium amino acids, 0.175% amino acids, 0.06% seaweed extract, 0.06% boron fertilizer, 0.06% zinc fertilizer, 0.03% molybdenum fertilizer, and the balance being water.

[0030] Secondly, the present invention provides a method for applying foliar fertilizer, comprising the following steps:

[0031] The above-mentioned foliar fertilizer was sprayed on the leaves of the cigar tobacco plants. The spraying time was as follows: the first spray was carried out during the crowning stage of the cigar tobacco plants, and the second spray was carried out during the vigorous growth stage. The crowning stage of the cigar tobacco plants was 28 to 33 days after transplanting and survival, and the vigorous growth stage was 45 to 55 days after transplanting and survival.

[0032] In this invention, the dosage is calculated based on the mass fraction of amino acid magnesium fertilizer, seaweed extract, boric acid, zinc sulfate, and ammonium molybdate contained in the foliar fertilizer, according to the amount of water used for spraying foliar fertilizer. After accurate weighing, the fertilizer is directly added to the water without any order requirement. After stirring evenly, it can be applied.

[0033] Preferably, foliar fertilizer is sprayed on sunny days, before 9:00 AM or after 4:00 PM. More preferably, it is from sunrise to 9:00 AM or from 4:00 PM to sunset. The spraying time can be adjusted appropriately according to the actual sunrise and sunset conditions in different regions. In this invention, the choice of spraying time is to avoid the cigar leaves being in a dormant state with closed stomata around noon or too early or too late, which would affect the absorption of foliar fertilizer.

[0034] Preferably, foliar fertilizer is sprayed on the front and / or back of the leaves of the cigar plant.

[0035] The preferred application rate of foliar fertilizer is: 40 mL to 60 mL per plant during the seedling stage and 80 mL to 100 mL per plant during the vigorous growth stage.

[0036] In this invention, the spraying interval between the basal stage and the vigorous growth stage is relatively long. This spraying method is chosen because tobacco enters a period of rapid growth after entering the basal stage. Spraying foliar fertilizer during this period can replenish nutrients in a timely manner and promote better growth and development. The vigorous growth stage, which lasts 45-55 days after transplanting, is in the early stage immediately following the budding and topping stages of the tobacco plant. At this time, the leaves of the whole plant are vigorous and are in the stage before the leaves extend, lengthen, and widen. After spraying foliar fertilizer, the absorption and utilization rate of nutrients is high, and the timely replenishment of nutrients has a good promoting effect on the photosynthesis, carbon and nitrogen metabolism, and the efficiency of the above-ground and underground translocation of photosynthetic products. Under the application of this foliar fertilizer, the proportion of chemical substances in cigar leaves tends to be more balanced, reducing the accumulation of single substances in the leaves and improving the combustibility of tobacco leaves.

[0037] To further illustrate the present invention, the foliar fertilizer for improving the combustibility of cigar tobacco leaves and the fertilization method provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments. Specifically, for ease of dissolution, zinc sulfate can be replaced with zinc sulfate heptahydrate according to the amount of zinc used, and ammonium molybdate can be replaced with ammonium molybdate tetrahydrate according to the amount of molybdenum used; the seaweed extract used was purchased from Qingdao Songtian Biotechnology Co., Ltd.

[0038] Example 1

[0039] A foliar fertilizer for improving the combustibility of cigar tobacco leaves, comprising, by weight percentage, the following active ingredients: 0.325% magnesium amino acids, 0.175% amino acids, 0.06% seaweed extract, 0.06% boric acid, 0.06% zinc sulfate, 0.03% ammonium molybdate, with the balance being water. The magnesium amino acids are magnesium glycine, and the amino acids are glycine.

[0040] A fertilization method for improving the combustibility of cigar tobacco leaves includes the following steps:

[0041] (1) When the cigar seedlings enter the clustering stage (32 days after transplanting and survival), spray the cigar seedlings with foliar fertilizer; the average amount is 50 mL / plant.

[0042] (2) When the cigar tobacco plants enter the vigorous growth period (45 days after transplanting), spray the cigar tobacco plants with foliar fertilizer; the average amount is 100mL / plant.

[0043] When spraying, the above foliar fertilizer should be sprayed on both sides of the cigar leaves, and should be done before 9 am or after 4 pm on a sunny day.

[0044] Example 2

[0045] A foliar fertilizer for improving the combustibility of cigar tobacco leaves, comprising, by weight percentage, the following active ingredients: 0.4% magnesium amino acids, 0.15% amino acids, 0.06% seaweed extract, 0.06% boric acid, 0.068% zinc sulfate, 0.03% ammonium molybdate, and the balance being water.

[0046] Wherein, the magnesium amino acid is magnesium glycine and the amino acid is glycine.

[0047] Example 3

[0048] A foliar fertilizer for improving the combustibility of cigar tobacco leaves, comprising, by weight percentage, the following active ingredients: 0.3% magnesium amino acid (magnesium glutamate), 0.04% seaweed extract, 0.05% boric acid, 0.03% zinc sulfate, 0.03% ammonium molybdate, and the balance being water.

[0049] Comparative Example 1

[0050] A foliar fertilizer, by weight percentage, comprises the following active ingredients: 0.5% magnesium sulfate heptahydrate, with the balance being water.

[0051] Comparative Example 2

[0052] A foliar fertilizer, by weight percentage, comprises the following active ingredients: 0.325% magnesium amino acids, 0.175% amino acids, and the balance being water.

[0053] Comparative Example 3

[0054] A foliar fertilizer, by weight percentage, comprises the following active ingredients: 0.325% magnesium amino acids, 0.175% amino acids, 0.06% boric acid, 0.06% zinc sulfate, 0.03% ammonium molybdate, with the balance being water.

[0055] Effect verification

[0056] Treatment Group 1: The foliar fertilizer of Comparative Example 1 (magnesium sulfate heptahydrate with only 0.5% active ingredient) was sprayed, and the spraying steps and dosage were the same as in Example 1.

[0057] Treatment Group 2: The foliar fertilizer of Comparative Example 2 (with only 0.325% amino acid magnesium and 0.175% amino acids as active ingredients) was sprayed, and the spraying steps and dosage were the same as in Example 1.

[0058] Treatment Group 3: The foliar fertilizer (excluding seaweed extract) of Comparative Example 3 was sprayed, and the spraying steps and dosage were the same as in Example 1.

[0059] Treatment group 4: The foliar fertilizer and fertilization method of Example 1 were used.

[0060] The experiment was conducted on May 28, 2023, in Xiangou Village, Lushui Town, Laifeng County, Enshi Prefecture, Hubei Province. 180 cigar tobacco plants were randomly assigned to each treatment group for transplanting. Field management, fertilization time and amount, and harvest time were all identical. The agronomic traits (Table 1), yield, and output value (Table 2) of cigar tobacco obtained from treatments 1-4 were investigated and statistically analyzed, and the combustibility of the middle leaves was measured. The agronomic traits of the tobacco plants were investigated according to the national standard YC / T 142-2010 "Methods for Investigating and Measuring Agronomic Traits of Tobacco," measuring different agronomic traits (leaf length, leaf width, number of effective leaves, and SPAD value) of different treatments. Yield and output value were calculated according to the Hubei Provincial Local Standard "DB42 / T1549-2020 Quality Specification for Cigar Tobacco Leaf Grading," grading and calculating the yield of wrapper, binder, and filler leaves for each treatment. The output value of the tobacco leaves was calculated based on the 2023 Hubei Province cigar tobacco leaf purchase price.

[0061] Table 1. Results of the survey on agronomical traits of cigars at maturity.

[0062]

[0063] According to the results in Table 1, during the cigar maturation period, the maximum leaf length, maximum leaf width, and SPAD value of the tobacco leaves in treatment group 4 were not significantly different from those in treatment groups 1-3. However, the values ​​in treatment group 4 were the highest. In conclusion, during the cigar maturation period, treatment group 4 can promote leaf elongation, extension, and chlorophyll synthesis.

[0064] Table 2. Economic Benefits of Cigars

[0065]

[0066] As can be seen from Table 2, treatment group 2 had the highest yield but the lowest rate of high-quality tobacco, while treatment group 4 had a slightly lower yield but the highest rate of high-quality tobacco, average price, and output value, reaching 34%, 44.46 yuan / kg, and 4783.48 yuan / mu, respectively. This shows that the method of the present invention effectively improves the quality and output value of tobacco leaves.

[0067] In the analysis of cigar tobacco leaf combustibility: Middle leaves were selected, and the main veins were removed as the test samples. Thermogravimetric analysis (TA) was used to analyze the combustion characteristics of the tobacco leaves under the following conditions: air atmosphere; 10 mg of sample passing through a 65-mesh sieve was weighed into a platinum crucible; the initial temperature was room temperature (21℃), and the temperature was increased to 980℃ at a rate of 30℃ / min. The sample weight versus temperature curve was obtained, and the DTG curve was derived by performing a first derivative on this curve. In this work, based on the thermal gravity analysis (TG) curve and differential thermal gravity (DTG) curve of the combustion spectrum, the TG-DTG joint definition method was used to determine the combustion characteristic parameters of the tobacco leaves, including the combustion initiation temperature, maximum combustion rate, maximum combustion rate temperature, and residue mass fraction. The results and analysis of the cigar tobacco leaf combustibility test are as follows:

[0068] (1) Investigating the effects of different treatments on the pyrolysis behavior of cigar tobacco leaves: The results of the effects of different treatments on the pyrolysis behavior of cigar tobacco leaves are as follows Figure 1 and Figure 2 As shown.

[0069] based on Figure 1 and Figure 2 The TG and DTG curves of cigar tobacco burning at a heating rate of 30℃ / min showed that the thermal decomposition process of cigar tobacco samples with different treatments was similar. As temperature increases, the pyrolysis process of cigar tobacco leaves can be divided into five weight loss stages. Stage I (21℃~105℃) is the dehydration and drying stage, mainly involving the evaporation of free and bound water within the tobacco leaves. Stage II (105℃~295℃) corresponds to the thermal decomposition of low-boiling-point organic matter and hemicellulose; the release of nicotine and the decomposition of pectin in tobacco also occur within this temperature range. Stage III (295℃~415℃) has a temperature range and peak temperature close to that of cellulose pyrolysis, indicating that this stage is mainly influenced by cellulose. Stage IV (415℃~820℃) initially involves the decomposition of char and lignin remaining from the previous stage of combustion. After 405℃, the weight loss rate increases and then slows down until around 720℃, at which point the weight loss rate begins to increase again, and lignin further decomposes and oxidizes. Stage V (820℃~980℃) has a slower weight loss rate (≤0.09% / min), mainly involving the slow oxidation of a small amount of residual carbon.

[0070] The rapid pyrolysis combustion of cigar tobacco mainly occurs in stages II and III, and the specific parameters and mass loss results are shown in Table 3.

[0071] Table 3. Parameters and mass loss in stages II and III of cigar tobacco pyrolysis.

[0072]

[0073] Combination Figures 1-2 As shown in Table 3, compared with treatment groups 1-3, treatment group 4 exhibits the highest maximum combustion rate in stage II of pyrolysis, while its maximum combustion rate in stage III is slightly lower than that of treatment group 3. Furthermore, treatment group 4 shows the smallest difference in combustion rates between stages II and III, with the corresponding temperatures at the lowest maximum combustion rates. Additionally, treatment group 4 has the highest total weight loss rate (48.13%) and the lowest ash content (12.5%) in stages II and III. In summary, the tobacco leaves from treatment group 4 exhibit a relatively stable combustion rate during stages II and III of the combustion process, resulting in more complete oxidation compared to other treatments.

[0074] (2) Investigate the effects of different treatments on the combustion characteristic parameters of cigar tobacco leaves: Based on the TG and DTG curves of tobacco leaf combustion, the TG-DTG joint definition method was used to determine the combustion initiation temperature and burnout temperature parameters of the tobacco leaves; the TG-DTG joint definition method is described in [reference needed]. Figure 3 Among them, the combustion initiation temperature (i.e., the ignition temperature) Draw a perpendicular line A from the peak point of the DTG curve, intersecting the TG curve at a point. Draw a tangent line B to the TG curve through that point. The temperature corresponding to the intersection of tangent line B and the upper horizontal line in the graph (where volatiles begin to lose weight) is the ignition temperature. (Flammation temperature) The temperature corresponding to the intersection of the above tangent B and the lower horizontal line in the figure (i.e., the end of the weightlessness of the TG curve) is the burnout temperature.

[0075] Specific analysis method: The combustion process of tobacco samples is complex. To better evaluate the combustibility of cigar tobacco, the ignition index (IFI) is used. Combustion stability index ( ) and comprehensive combustion characteristic index ( This study evaluated the combustion performance of cigar tobacco leaves under different treatments. The ignition performance of the samples was compared with... They are positively correlated. The value reflects the flammability and reactivity of the sample. It is mainly used to evaluate the combustion stability of samples during the combustion process. The larger the diameter, the more stable the combustion. The higher the value, the better the overall combustion performance of the sample.

[0076] Ignition Index:

[0077]

[0078] Combustion stability index:

[0079]

[0080] Overall Combustion Characteristics Index:

[0081]

[0082] Average combustion rate:

[0083]

[0084] In equations (1), (2), (3), and (4), Maximum combustion rate (maximum weight loss rate), % / min; The average combustion rate is expressed as % / min. Corresponding combustion initiation temperature, ℃; The temperature corresponding to the maximum combustion rate, in °C; The burnout temperature is ℃. The heating rate is expressed in °C / min. For the sample temperature to reach the combustion initiation temperature The corresponding remaining mass fraction of the sample at that time, % To ensure the sample temperature reaches the burnout temperature The corresponding remaining mass fraction of the sample at that time.

[0085] The relevant results of each treatment group obtained by the TG-DTG joint definition method are shown in Table 4.

[0086] Table 4 Characteristic parameters of pyrolysis of cigar tobacco leaves

[0087]

[0088] Note: Corresponding combustion initiation temperature, ℃; The temperature corresponding to the maximum combustion rate, in °C; The burnout temperature is ℃. Maximum combustion rate, % / min; The average combustion rate is expressed as % / min. The ignition index is expressed as %·min. -1 ·℃ -2 ; The combustion stability index is expressed as %·min. -1 ·℃ -1 ; The comprehensive combustion characteristic index, % 2 ·min -2 ·℃ -3 .

[0089] As shown in Table 4, compared with treatment groups 1-3, the cigar tobacco leaves in treatment group 4 had the lowest combustion initiation temperature and burnout temperature, and the highest maximum combustion rate ( ), average combustion rate ( ), Ignition Index ( Combustion stability index ( ) and comprehensive combustion characteristic index ( The highest value indicates that the cigar tobacco leaves in treatment group 4 are easy to ignite, have a stable combustion process, and burn completely, resulting in the best overall combustion performance.

[0090] The results of the embodiments show that the foliar fertilizer and fertilization method provided by the present invention can effectively improve the combustibility of tobacco leaves. The tobacco leaves treated with this method have low ash content, the highest ignition index, combustion stability index and comprehensive combustion characteristic index, and the best combustibility.

[0091] Unlike existing technologies, this invention provides a foliar fertilizer and application method for improving the combustibility of cigar tobacco leaves. The foliar fertilizer for improving the combustibility of cigar tobacco leaves comprises the following active ingredients: 0.3%–0.7% amino acid magnesium fertilizer, 0.03%–0.07% seaweed extract, 0.04%–0.07% boric acid, 0.02%–0.07% zinc sulfate, 0.02%–0.04% ammonium molybdate, and the balance being water; the amino acid magnesium fertilizer contains more than 60% amino acid magnesium, with the balance being amino acids. This foliar fertilizer promotes the absorption of magnesium and other trace elements by tobacco leaves, helping to regulate the plant's nutrient balance, promote photosynthesis, and control the content of chemical components in tobacco leaves, thereby increasing the yield and quality of cigar tobacco leaves and improving their combustibility. The addition of the natural active substance seaweed extract increases the amount and duration of the foliar fertilizer adhering to the leaf surface, promotes the absorption of the foliar fertilizer through the leaf biofilm, and enhances its effectiveness. In application examples, compared with the comparative example, the method of the present invention increases the tobacco leaf output value by RMB 39.11 to RMB 245.55 per mu, the rate of high-grade tobacco increases by 0.09% to 4.8%, and the purchase price of tobacco leaves increases by RMB 1.38 to RMB 2.71 per kilogram. Regarding the combustibility of tobacco leaves, due to the low order of magnitude of the data, it is expressed as a relative percentage change. Compared with the comparative example, the ash content of the tobacco leaves treated by the method of the present invention is relatively reduced by 1.96% to 4.36%, the ignition index is relatively increased by 2.13% to 4.35%, the combustion stability index is relatively increased by 1.10% to 6.98%, and the comprehensive combustion characteristic index is relatively increased by 4.10% to 9.05%. This indicates that the tobacco leaves treated by the method of the present invention are easy to ignite, have a stable combustion process, burn completely, and have good overall combustion performance. In summary, the method of the present invention has a significant effect on improving the combustibility of cigar tobacco leaves, is green and safe, is simple to use, and also has a certain effect on increasing output value.

[0092] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A foliar fertilizer for improving the combustibility of cigar tobacco leaves, characterized in that, The foliar fertilizer comprises the following components by weight percentage: 0.3%–0.7% amino acid magnesium fertilizer, 0.03%–0.07% seaweed extract, 0.04%–0.07% boron fertilizer, 0.02%–0.07% zinc fertilizer, 0.02%–0.04% molybdenum fertilizer, and the balance being water; wherein the amino acid magnesium fertilizer contains more than 60% amino acid magnesium, and the balance being amino acids.

2. The foliar fertilizer for improving the combustibility of cigar tobacco leaves according to claim 1, characterized in that, It includes the following components by weight percentage: 0.3%–0.35% magnesium amino acids, 0.01%–0.2% amino acids, 0.04%–0.06% seaweed extract, 0.05%–0.06% boron fertilizer, 0.03%–0.07% zinc fertilizer, 0.02%–0.04% molybdenum fertilizer, and the balance being water.

3. The foliar fertilizer for improving the combustibility of cigar tobacco leaves according to claim 1, characterized in that, 0.325% magnesium amino acid, 0.175% amino acid, 0.06% seaweed extract, 0.06% boron fertilizer, 0.06% zinc fertilizer, 0.03% molybdenum fertilizer, and the remainder water.

4. The foliar fertilizer for improving the combustibility of cigar tobacco leaves according to claim 1, characterized in that, The boron fertilizer includes boric acid or sodium borate; the zinc fertilizer includes zinc sulfate; and the molybdenum fertilizer includes ammonium molybdate or sodium molybdate.

5. A method for applying a foliar fertilizer to improve the combustibility of cigar tobacco leaves, characterized in that, Includes the following steps: The foliar fertilizer according to any one of claims 1-4 is sprayed onto the leaves of cigar tobacco plants. The spraying time is as follows: the first spray is carried out during the crowning stage of the cigar tobacco plants, and the second spray is carried out during the vigorous growth stage. The crowning stage of the cigar tobacco plants is 28 to 33 days after transplanting and survival, and the vigorous growth stage is 45 to 55 days after transplanting and survival.

6. The fertilization method for the foliar fertilizer to improve the combustibility of cigar tobacco leaves according to claim 5, characterized in that, The foliar fertilizer was sprayed on a sunny day, before 9 a.m. or after 4 p.m.

7. The fertilization method for the foliar fertilizer to improve the combustibility of cigar tobacco leaves according to claim 5, characterized in that, The foliar fertilizer is sprayed on the front and / or back of the leaves of the cigar plant.

8. The fertilization method for the foliar fertilizer to improve the combustibility of cigar tobacco leaves according to claim 5, characterized in that, The application rate of the foliar fertilizer is as follows: 40 mL to 60 mL per plant during the budding stage, and 80 mL to 100 mL per plant during the vigorous growth stage.

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