Method for exploring influence of different potash fertilizers on potassium absorption effect of flue-cured tobacco leaves

Abstract

The invention discloses a method for exploring the influence of different potash fertilizers on the potassium absorption effect of flue-cured tobacco leaves, which comprises the following steps: firstly, selecting an experimental plot, measuring the original pH and the rapidly available potassium content of the experimental plot, planting flue-cured tobacco, then dividing the experimental plot into 15 small plots, correspondingly setting five different treatment groups, and repeating for three times in each group; collecting a soil sample 7 days after topping of the flue-cured tobacco, and determining the pH value and rapidly available potassium content of the soil; 7 days after flue-cured tobacco topping, three whole tobacco plants with uniform growth vigor are selected from each plot and taken out, and the biomass, the potassium content and accumulation of different parts of the tobacco plants and potash fertilizer utilization parameters are measured; after the flue-cured tobacco is mature, harvesting tobacco leaves for baking, and taking middle leaves for comprehensive quality analysis. The influence of the potash fertilizer on the flue-cured tobacco leaves is researched through a systematic research method, and a powerful theoretical basis is provided for fertilizer selection in flue-cured tobacco planting.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural fertilizer effect research, and more specifically to a method for exploring the influence of different potassium fertilizers on potassium absorption effects of flue-cured tobacco leaves. Background Art

[0002] Potassium is one of the essential nutrients for the growth, development and physiological metabolism of flue-cured tobacco. It not only improves the combustibility of tobacco leaves and reduces the tar content, but also significantly affects the availability of flue-cured tobacco leaves. It is called the "quality element" of flue-cured tobacco. In order to pursue tobacco leaf quality and meet the potassium demand of high-quality flue-cured tobacco, tobacco production in tobacco-producing areas generally chooses to apply a large amount of potassium sulfate fertilizer. However, long-term and large-scale application of potassium sulfate fertilizer will lead to a decrease in the utilization rate of potassium and cause problems such as soil nutrient imbalance, soil acidification and compaction. In addition, sulfate ions (SO4 2- The accumulation of potassium fertilizers will have an adverse effect on the growth of tobacco roots and the combustibility of flue-cured tobacco, thereby reducing the quality of tobacco leaves. Therefore, screening suitable potassium fertilizers is of great significance for the production of high-quality tobacco leaves in Fujian tobacco-growing areas.

[0003] In recent years, research on the effects of different potassium fertilizer varieties on potassium accumulation and yield and quality of flue-cured tobacco has gradually attracted attention. Zhou Shuoye et al. conducted experiments on different types of potassium fertilizers in tobacco-growing areas in southern Henan. The results showed that potassium carbonate fertilizers instead of conventional potassium sulfate fertilizers can improve tobacco yield and quality. Humic acid potassium fertilizers, as a new type of high-molecular potassium fertilizer, enhance fertilizer efficiency through complexation and adsorption. Compared with the application of potassium sulfate fertilizers, the application of potassium humate can increase the content of soil available potassium and tobacco potassium, and improve tobacco quality. Potassium silicate is a slow-release potassium fertilizer suitable for acidic soils with long-lasting fertilizer effects. The research of Zhu Jingwei et al. showed that the use of potassium silicate instead of potassium sulfate can significantly improve the potassium supply of tobacco-growing soil in the tobacco-growing areas of Qianzhong, increase the number of rhizosphere microorganisms in flue-cured tobacco, and improve the root vitality of flue-cured tobacco. However, the current tobacco-growing areas in Fujian have problems such as low potassium utilization and reduced tobacco quality due to long-term and excessive application of potassium sulfate fertilizers. It is urgent to explore alternative potassium fertilizer varieties to optimize soil potassium supply and improve tobacco quality, so as to meet the production needs of high-quality flue-cured tobacco. Summary of the invention

[0004] In view of this, the present invention provides a method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves, comprising the following steps:

[0005] Step 1: Select the experimental plots, measure the original pH and available potassium content of the experimental plots, and plant flue-cured tobacco;

[0006] Step 2: Divide the experimental plot into 15 plots and set up five different treatment groups, namely: group CK with potassium sulfate fertilizer, group K1 with potassium carbonate fertilizer, group K2 with potassium humate fertilizer, group K3 with potassium silicate fertilizer and group K0 without potassium fertilizer, with each group repeated 3 times;

[0007] Step 3: Collect soil samples 7 days after the tobacco is toppled to determine the soil pH and available potassium content; select 3 tobacco plants with uniform growth in each plot 7 days after the tobacco is toppled, take out the whole plants to determine the biomass, potassium content and accumulation in different parts of the plants, and potassium fertilizer utilization parameters; harvest the tobacco leaves after they are mature and bake them, and take the middle leaves for comprehensive quality analysis.

[0008] Preferably, in step 1, the flue-cured tobacco variety is selected as CB-1, the planting row spacing is 120 cm×50 cm, and the planting density is 17400 plants / hm2. 2 .

[0009] Preferably, the area of ​​each community in step 2 is 100 m2.

[0010] Preferably, in step 2, except for the K0 group, the amounts of nitrogen, phosphorus and potassium in each treatment are the same; the amounts of nitrogen and phosphorus in the K0 treatment are the same as those in other treatments, and the nitrogen fertilizer application rate is 107.70 kg / hm 2 The N:P2O5:K2O ratio in each treatment group was 1:1:3.5.

[0011] Preferably, the active ingredient content of the potassium sulfate fertilizer is 52.0%, the active ingredient content of the potassium carbonate fertilizer is 59.0%, the active ingredient content of the potassium humate fertilizer is 12.0%, and the active ingredient content of the potassium silicate fertilizer is 34%.

[0012] Preferably, in step 3, soil samples are collected by drilling fresh soil samples at a depth of 0-20 cm from the ridge profile, 5 sample points in each plot are mixed evenly, and each treatment is repeated 3 times.

[0013] Preferably, the biomass determination in step three is as follows: the harvested leaves and roots and stems of the corresponding tobacco plants are sterilized at 105°C for 0.5h, and then dried at 75°C to constant weight, and the dry matter weight of different parts of the tobacco plants is weighed and recorded.

[0014] Preferably, the potassium fertilizer utilization parameters in step three include one or more of potassium fertilizer apparent utilization rate, potassium fertilizer agronomic efficiency, potassium fertilizer partial productivity, potassium fertilizer apparent balance, and potassium fertilizer dependence rate.

[0015] Preferably, the comprehensive quality analysis in step 3 includes analysis of chemical components of flue-cured tobacco, analysis of sensory quality and analysis of economic characteristics of flue-cured tobacco;

[0016] The chemical components include total nitrogen, potassium, chlorine, total sugar, reducing sugar and nicotine, which are determined using a AAIII type continuous flow chemical analyzer;

[0017] The sensory quality analysis includes analysis of flavor type, sweetness, aroma quality, aroma quantity, impurities, fineness, concentration, strength, irritation and aftertaste, and is evaluated and identified by relevant technical personnel with reference to YC / T 138-1998 "Sensory Evaluation Methods for Tobacco and Tobacco Products";

[0018] The economic trait analysis includes analysis of yield, output value, average price and proportion of medium and high-quality tobacco.

[0019] Furthermore, the values ​​of chemical composition, sensory quality and economic traits were normalized by the membership function method, and then the weights of different indicators were calculated by fuzzy comprehensive evaluation.

[0020] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves, which has the following beneficial effects:

[0021] The present invention studies the effects of different types of potassium fertilizers on soil properties, potassium absorption and yield and quality of flue-cured tobacco through field experiments, and can screen out types of potassium fertilizers suitable for tobacco production in Fujian tobacco-growing areas, provide support for a potassium fertilizer management technology model centered on improving potassium utilization, and achieve efficient utilization of potassium in the soil-flue-cured tobacco system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 The effects of different potassium fertilizers on potassium content in different parts of flue-cured tobacco.

[0024] Figure 2 The effect of different potassium fertilizers on potassium accumulation in different parts of flue-cured tobacco.

[0025] Figure 3 The effect of different types of potassium fertilizers on the sensory quality of flue-cured tobacco. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the 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.

[0027] Example 1

[0028] Test materials and test sites: The test was carried out in Zhentou Village, Jianyang District, Nanping City, Fujian Province (27°12′40″N, 118°7′26″E) from January 2022 to July 2023 for a period of 2 years. The local climate is subtropical monsoon and the soil type is paddy soil. The test site has long adopted a tobacco-rice rotation planting pattern (this study only involves the tobacco season). The test flue-cured tobacco variety is CB-1, the row spacing is 120cm×50cm, and the planting density is 17400 plants / hm2. 2 Before the experiment, the soil pH of the tillage layer (0-20cm) was 4.49, the organic matter was 32.45g / kg, and the alkaline nitrogen, available phosphorus and available potassium were 134.78, 134.62 and 163.54mg / kg respectively.

[0029] Four potassium fertilizer treatments were set up, CK: application of potassium sulfate; K1: application of potassium carbonate fertilizer; K2: application of potassium humate; K3: application of potassium silicate; in order to calculate the utilization rate of potassium fertilizer, a treatment without application of potassium fertilizer (K0) was set up; the experiment adopted a randomized block design, with each treatment repeated 3 times, a total of 15 plots, and a plot area of ​​100m2.

[0030] Except for the K0 treatment, the nitrogen, phosphorus and potassium dosages of each treatment were the same; the nitrogen and phosphorus dosages of the K0 treatment were the same as those of the other treatments. The nitrogen fertilizer application rate was 107.70 kg / hm 2 , N:P2O5:K2O in each treatment was 1:1:3.5. Test fertilizers: compound fertilizer (N 12.5%, P2O58.0%, K2O 22.5%), potassium sulfate (K2O 52.0%), potassium carbonate (K2O 59.0%), potassium humate (K2O12.0%), potassium silicate (K2O 34.0%) and calcium magnesium phosphate fertilizer (P2O512.0%). Tobacco seedlings were transplanted in the field on January 5th of each year, topped on April 27th, foot leaves collected on May 6th, and top leaves collected on June 23rd. The rest of the production management and fertilization referred to the production technology plan of Nanping flue-cured tobacco variety CB-1 that year.

[0031] Sample collection:

[0032] Soil sample collection: Soil samples were collected 7 days after the flue-cured tobacco was toppled. Soil was taken from the ridge section (0-20 cm) with a soil drill to obtain fresh soil samples. Five sampling points were collected in each plot and mixed evenly. Each treatment was repeated 3 times.

[0033] Plant sample collection: 7 days after topping, select 3 tobacco plants with uniform growth in each plot and take them out with a shovel for measuring biomass and the distribution of potassium content in different parts of the tobacco plants. When the flue-cured tobacco is mature, harvest and bake the leaves. The leaves are harvested from bottom to top in 3-4 times, and the middle leaves are taken for chemical composition identification and sensory quality evaluation.

[0034] Measurement items and methods:

[0035] Soil pH was measured using a pH meter, and available potassium was extracted using the ammonium acetate method and determined using flame photometry.

[0036] The total potassium content of flue-cured tobacco was determined by H2SO4-H2O2 digestion-flame photometer method.

[0037] Calculation method of relevant parameters of potash fertilizer utilization:

[0038] Potassium accumulation (kg / hm 2 ) = dry matter mass of flue-cured tobacco roots, stems, leaves and flowers (kg / hm2) 2 )×potassium content (%);

[0039] Apparent utilization rate of potassium fertilizer (RE, %) = (potassium accumulation in the potassium application area - potassium accumulation in the area without sulfur application) / potassium application amount × 100;

[0040] Agronomic efficiency of potassium fertilizer (AE, kg / kg) = (tobacco leaf yield in the potassium application area - tobacco leaf yield in the non-potassium application area) / potassium application amount;

[0041] Potassium fertilizer partial productivity (PEP, kg / kg) = tobacco leaf yield in potassium application area / potassium application amount;

[0042] Potash fertilizer apparent balance (NA, kg / hm 2 ) = total potassium fertilizer input - total potassium accumulation of flue-cured tobacco;

[0043] Potassium fertilizer dependence rate (PDR, %) = (total potassium accumulation of flue-cured tobacco in the area without potassium application / total potassium accumulation of flue-cured tobacco in the area with potassium application) × 100;

[0044] Tobacco plant biomass determination: The harvested leaves and roots and stems of the corresponding tobacco plants were sterilized at 105°C for 0.5 h, and then dried at 75°C to constant weight. The dry matter weight of different parts of the tobacco plants was weighed and recorded.

[0045] Flue-cured tobacco yield, output value and quality analysis:

[0046] The data of tobacco leaf grading were collected to count the economic traits of flue-cured tobacco, determine the yield, average price and proportion of medium and high-quality tobacco after flue-cured tobacco, and calculate the output value of different treatments according to the local purchase price. The chemical components such as total nitrogen, total sugar, reducing sugar, nicotine, and chlorine in flue-cured tobacco leaves were determined using an AAIII continuous flow chemical analyzer. With reference to YC / T 138-1998 "Sensory Evaluation Methods for Tobacco and Tobacco Products", relevant technical personnel conducted evaluation and identification.

[0047] The values ​​of chemical composition, sensory quality and economic traits were normalized by the membership function method, and then the weights of different indicators were calculated by fuzzy comprehensive evaluation.

[0048] Data analysis: Data processing and drawing were performed using Microsoft Excel 2016, SPSS26.0, and Origin2024. One-way ANOVA was used to analyze the differences between different treatment indicators, and LSD method was used for multiple comparisons (P<0.05). The data in the tables and figures of the following results are expressed as mean ± standard deviation (SD).

[0049] The specific results are as follows:

[0050] (1) Effects of different types of potassium fertilizers on soil properties

[0051] Table 1 Effects of different types of potassium fertilizers on soil properties

[0052]

[0053] Note: The same lowercase letters in the same column of the same year indicate significant differences among treatments (P<0.05), the same below.

[0054] Table 1 shows that the soil pH value of K1 treatment was the highest in 2022 and 2023, which was significantly increased by 0.08 and 0.06 compared with CK; K3 treatment also significantly increased the pH value, by 0.06 and 0.07 in two years. K2 and K3 treatments significantly reduced the available potassium content in the soil, by 28.05% to 34.19% and 25.72% to 28.22% in two years, respectively. The apparent potassium balance (NA) and potassium dependence rate (PDR) of potassium fertilizer were calculated based on the potassium fertilizer input and potassium accumulation of flue-cured tobacco. The results showed that the soil potassium of each treatment was surplus in 2022 and 2023. The surplus degree in 2022 was: K3>CK>K2>K1, and the surplus degree in 2023 was: CK>K3>K2>K1. The K1 treatment significantly reduced PDR compared with the CK treatment, with a decrease of 12.75% and 32.35% in the two years respectively; the K3 treatment in 2022 significantly increased soil PDR by 4.80%; compared with CK, both K2 and K3 treatments in 2023 significantly reduced PDR, with a decrease of 19.89% and 12.38% respectively.

[0055] (2) Effects of different potassium fertilizer types on potassium content in different parts of tobacco plants

[0056] The results are as follows Figure 1As shown in the results, in 2022, all treatments significantly increased the potassium content of roots compared with CK, with an increase of 6.79%-25.55%; only K1 treatment significantly increased the potassium content of stems by 4.16%; the potassium content of upper leaves was the highest in K1 treatment, and K2 and K3 treatments significantly reduced the potassium content of upper leaves by 10.60%-17.51% compared with CK; K1 treatment significantly increased the potassium content of middle and lower leaves by 4.35% and 8.27% compared with CK. In 2023, only K1 treatment significantly increased the potassium content of roots by 11.23%; compared with CK treatment, all treatments significantly increased the potassium content of stems by 21.00%-39.31%; K1 and K3 treatments significantly increased the potassium content of upper leaves by 5.58% and 10.26%, the potassium content of middle leaves by 9.13% and 8.09%, and the potassium content of lower leaves by 8.34% and 6.42% compared with CK. The results of both years showed that K1 treatment could significantly increase the potassium content in roots, stems, middle leaves and lower leaves.

[0057] (3) Effects of different potassium fertilizer types on potassium accumulation in tobacco plants

[0058] The potassium accumulation in each part of the flue-cured tobacco was calculated based on the potassium content and biomass of each part of the tobacco. Figure 2 As shown, it can be seen that the potassium accumulation in the roots in 2022 was the highest in K1 treatment, and each treatment significantly increased the potassium accumulation in the roots by 17.72%-42.46% compared with CK; K1 and K2 treatments significantly increased the potassium accumulation in the stems by 14.70% and 7.85%; K2 and K3 treatments significantly reduced the potassium accumulation in the upper leaves by 12.86% and 21.61% compared with the CK treatment; only K1 treatment significantly increased the potassium accumulation in the middle leaves by 18.36% and the potassium accumulation in the lower leaves by 9.25%; the relationship between the potassium accumulation of flue-cured tobacco was: K1>K2>CK>K3, and K1 significantly increased the total potassium accumulation by 14.64%. In 2023, only K1 treatment significantly increased the potassium accumulation of roots by 22.45%; all treatments significantly increased the potassium accumulation of stems and middle leaves, with increases of 27.29%-102.06% and 12.34%-29.89%; compared with CK, K3 treatment significantly increased the potassium accumulation of upper leaves by 11.36%; only K1 treatment significantly increased the potassium accumulation of lower leaves by 24.79%; all treatments significantly increased the total potassium accumulation compared with CK, with an increase of 14.12%-47.77%. It can be seen that K1 treatment significantly increased the potassium accumulation of roots, stems, middle leaves and lower leaves in 2022 and 2023, and thus significantly increased the total potassium accumulation of tobacco plants.

[0059] (4) Effects of different types of potassium fertilizers on the utilization of potassium fertilizers in flue-cured tobacco

[0060] The potassium fertilizer utilization rate of flue-cured tobacco in the experimental plot was analyzed, and the results are shown in Table 2.

[0061] Table 2 Effects of different types of potassium fertilizers on the utilization rate of potassium fertilizers in flue-cured tobacco

[0062]

[0063] Table 2 shows that the apparent utilization rate (RE) of potassium fertilizer in 2022 is: K1>K2>CK>K3, and K1 treatment significantly increased RE by 56.65% compared with CK; the agronomic efficiency (AE) and partial productivity (PEP) of potassium fertilizer were both the highest in K1 treatment, which were significantly increased by 53.85% and 3.73% compared with CK, respectively. The RE size relationship in 2023 is: K1>K2>K3>CK, and each treatment significantly increased RE by 54.29%-184.77%; AE and PEP were also the highest in K1 treatment, and K1 and K3 treatments significantly increased AE and PEP by 28.79%-83.33% and 2.21%-6.40%. In summary, K1 treatment had the highest AE and PEP in 2022 and 2023.

[0064] (5) Effects of different types of potassium fertilizers on the chemical composition of flue-cured tobacco

[0065] The analysis of chemical components of the middle leaves of flue-cured tobacco is shown in Table 3.

[0066] Table 3 Effects of different types of potassium fertilizers on the chemical composition of flue-cured tobacco

[0067]

[0068] Table 3 shows that the potassium content of the middle leaves in 2022 ranged from 2.11% to 2.51%, and the K1 treatment significantly increased the potassium content of the middle leaves by 18.96% compared with the K3 treatment; compared with the CK treatment, the K3 treatment significantly increased the reducing sugar content of the middle leaves by 8.83%; the K1 and K2 treatments significantly reduced the nicotine content of the middle leaves by 27.12% and 34.75%. The potassium content of the middle leaves in 2023 ranged from 2.62% to 2.76%, and each treatment significantly increased the total potassium content of the middle leaves by 1.91% to 5.34% compared with the CK treatment; there was no significant difference in the total nitrogen, chlorine, total sugar, reducing sugar and nicotine content of the middle leaves of each treatment compared with the CK treatment.

[0069] (6) Effects of different types of potassium fertilizers on the sensory quality of flue-cured tobacco

[0070] The sensory quality of tobacco leaves treated with different methods was evaluated. Figure 3As shown, the results show that the comprehensive score of the middle leaves in 2022 is: K2>K1>CK>K3, and the CK treatment is weaker than the K1 and K2 treatments in terms of style and aroma; the K1 treatment is more irritating, the smoke is more delicate, and the aroma quality is better; the K2 treatment has a more prominent style, better sweetness, and slightly irritating; the K3 treatment is more irritating. The comprehensive score of the middle leaves in 2023 is: K1>K2>K3>CK, the K1 treatment has better aroma quality, the K2 treatment has a slightly rough smoke and a slightly heavier residue, the K3 treatment has a greater irritation and a heavier residue, and the CK treatment has a heavier residue and less aroma. The data from both years show that the sensory quality of the K1 and K2 treatments is better than that of the CK treatment.

[0071] (7) Effects of different types of potassium fertilizers on economic traits of flue-cured tobacco

[0072] The statistical results of the economic traits of different treatments are shown in Table 4.

[0073] Table 4 Effects of different types of potassium fertilizers on economic traits of flue-cured tobacco

[0074]

[0075] The results showed that there was no significant difference in economic traits among the treatments in 2022; in 2023, only the K1 treatment significantly increased the average output value compared with the CK treatment, with increases of 5.92% and 6.02% respectively.

[0076] (8) Effects of different types of potassium fertilizers on the overall quality of flue-cured tobacco

[0077] The data of chemical composition, sensory quality and economic traits of flue-cured tobacco varieties were weighted and scored using the fuzzy comprehensive evaluation method. The comprehensive quality scores are shown in Table 5.

[0078] Table 5 Effects of different types of potassium fertilizers on the comprehensive quality of flue-cured tobacco

[0079]

[0080]

[0081] The results showed that in 2022, the chemical composition scores and sensory quality scores of K1 and K2 treatments were higher, and the economic scores of K1 and K3 treatments were higher. In 2023, the chemical composition scores of K1 and K3 treatments were higher, and the sensory quality of K1 and K2 treatments was higher. In summary, the comprehensive quality of flue-cured tobacco in K1 and K2 treatments was higher than that in CK treatment.

[0082] In summary, potassium carbonate and potassium silicate, as alkaline potassium fertilizers, can help alleviate soil acidification caused by long-term application of potassium sulfate, but potassium silicate, as a slow-release potassium fertilizer, reduces the content of available potassium in the soil. Potassium carbonate treatment significantly increased the total potassium accumulation and utilization rate of tobacco plants. Comprehensive quality evaluation showed that the chemical composition of potassium carbonate and potassium humate was well coordinated, and their sensory quality was better than potassium sulfate. Overall, potassium carbonate performed best in alleviating soil acidification and increasing the potassium content and quality of tobacco leaves. It is recommended to apply potassium carbonate fertilizer instead of conventional potassium sulfate fertilizer in areas with high sulfur content in tobacco field soil and tobacco leaves.

[0083] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves, characterized in that: The following steps are involved: Step 1: Select the experimental plots, measure the original pH and available potassium content of the experimental plots, and plant flue-cured tobacco; Step 2: Divide the experimental plot into 15 plots and set up five different treatment groups, namely: group CK with potassium sulfate fertilizer, group K1 with potassium carbonate fertilizer, group K2 with potassium humate fertilizer, group K3 with potassium silicate fertilizer and group K0 without potassium fertilizer, with each group repeated 3 times; Step 3: Collect soil samples 7 days after the tobacco is toppled to determine the soil pH and available potassium content; select 3 tobacco plants with uniform growth in each plot 7 days after the tobacco is toppled, take out the whole plants to determine the biomass, potassium content and accumulation in different parts of the plants, and potassium fertilizer utilization parameters; harvest the tobacco leaves after they are mature and bake them, and take the middle leaves for comprehensive quality analysis.

2. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: In step 1, the flue-cured tobacco variety is CB-1, the planting row spacing is 120 cm × 50 cm, and the planting density is 17400 plants / hm2. 2 .

3. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: In step 2, the area of ​​each community is 100 ㎡.

4. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: In step 2, except for the K0 group, the nitrogen, phosphorus and potassium dosages of each treatment were the same; the nitrogen and phosphorus dosages of the K0 treatment were the same as those of the other treatments, and the nitrogen fertilizer application rate was 107.70 kg / hm 2 The N:P2O5:K2O ratio in each treatment group was 1:1:3.

5.

5. A method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1 or 4, characterized in that: The effective component content of the potassium sulfate fertilizer is 52.0%, the effective component content of the potassium carbonate fertilizer is 59.0%, the effective component content of the potassium humate fertilizer is 12.0%, and the effective component content of the potassium silicate fertilizer is 34%.

6. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: In step 3, soil samples were collected by drilling fresh soil samples at a depth of 0-20 cm from the ridge profile. Five sample points in each plot were mixed evenly, and each treatment was repeated 3 times.

7. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: The biomass determination in step 3 is as follows: the harvested leaves and roots and stems of the corresponding tobacco plants are sterilized at 105°C for 0.5h, and then dried at 75°C to constant weight, and the dry matter weight of different parts of the tobacco plants is weighed and recorded.

8. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: The potassium fertilizer utilization parameters in step three include one or more of potassium fertilizer apparent utilization rate, potassium fertilizer agronomic efficiency, potassium fertilizer partial productivity, potassium fertilizer apparent balance, and potassium fertilizer dependence rate.

9. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 1, characterized in that: The comprehensive quality analysis in step 3 includes analysis of chemical components, sensory quality and economic characteristics of flue-cured tobacco; The chemical components include total nitrogen, potassium, chlorine, total sugar, reducing sugar and nicotine, which are determined using a AAIII type continuous flow chemical analyzer; The sensory quality analysis includes analysis of flavor type, sweetness, aroma quality, aroma quantity, impurities, fineness, concentration, strength, irritation and aftertaste, and is evaluated and identified by relevant technical personnel with reference to YC / T 138-1998 "Sensory Evaluation Methods for Tobacco and Tobacco Products"; The economic trait analysis includes analysis of yield, output value, average price and proportion of medium and high-quality tobacco.

10. The method for exploring the effects of different potassium fertilizers on potassium absorption of flue-cured tobacco leaves according to claim 9, characterized in that: The values ​​of chemical composition, sensory quality and economic traits were normalized by the membership function method, and then the weights of different indicators were calculated by fuzzy comprehensive evaluation.

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