CN114097564A - Method for controlling consistent maturity of partial tobacco leaves - Google Patents

Method for controlling consistent maturity of partial tobacco leaves Download PDF

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CN114097564A
CN114097564A CN202111621415.7A CN202111621415A CN114097564A CN 114097564 A CN114097564 A CN 114097564A CN 202111621415 A CN202111621415 A CN 202111621415A CN 114097564 A CN114097564 A CN 114097564A
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tobacco
leaves
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CN114097564B (en
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杨懿德
杨洋
鄢敏
曾淑华
郭冲
郭仕平
陈佛源
韩伟
杨国伟
刘雅洁
刘雷
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SICHUAN TOBACCO Corp YIBIN BRANCH
Sichuan Agricultural University
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SICHUAN TOBACCO Corp YIBIN BRANCH
Sichuan Agricultural University
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00Cultivation of specific crops or plants not otherwise provided for
    • A01G22/45Tobacco
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00Botany in general
    • A01G7/06Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants

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Abstract

The invention discloses a method for controlling consistent maturity of partial tobacco leaves, which realizes synchronous maturity of the tobacco leaves of the same tobacco plant by distinguishing and managing the same tobacco plant and assisting field management such as good soil fertilization. The method comprises the steps of planting and field management, wherein the field management step comprises topping tobacco plants, spraying gibberellin and potassium nitrate aiming at the faster mature leaves in the upper leaves belonging to the same tobacco plant, and finally harvesting the tobacco leaves of the same tobacco plant at one time. The invention can delay the aging of the 4 th to 6 th tobacco leaves on the upper part from top to bottom, prolong the growth period, achieve the aim of synchronously maturing the tobacco leaves 1 to 3 from top to bottom, improve the overall quality of the tobacco leaves after baking, and solve the problems of uneven color and large thickness difference of the baked tobacco leaves caused by the great maturity difference between the leaves and the reduced quality of the baked tobacco leaves.

Description

Method for controlling consistent maturity of partial tobacco leaves
Technical Field
The invention relates to a plant planting management method, in particular to a method for controlling the consistent maturity of partial tobacco leaves.
Background
Flue-cured tobacco is one of the important economic crops in China and plays an important role in national economy. Wherein the upper leaves of the flue-cured tobacco account for 1/3 of the single tobacco leaves, accounting for about 40 percent of the total yield, and the quality is second only to the middle leaves. At present, the problems of more green ribs and floating green smoke of flue-cured tobacco leaves, higher nicotine, strong irritation, poor tobacco leaf quality and the like of the upper tobacco leaves in China generally exist. However, in the one-time picking and baking process of upper leaves of flue-cured tobaccos, the maturity difference between leaves is large, so that the quality of the baked tobaccos is reduced, and the problems of uneven color, large thickness difference and the like occur after baking. Therefore, the improvement of the synchronous maturity of the upper 6 tobacco leaves is a problem to be solved urgently. At present, no research report on promoting the synchronous maturity of upper leaves of flue-cured tobacco exists.
Therefore, in order to further increase the income of agricultural planting and improve the quality of tobacco leaves, it is necessary to research and solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for controlling the consistent maturity of partial tobacco leaves, which realizes the synchronous maturity of the tobacco leaves of the same tobacco plant by distinguishing and managing the same tobacco plant and assisting field management such as good soil fertilization.
The method for controlling consistent maturity of partial tobacco leaves is used for controlling growth of tobacco plants and comprises the following steps of planting and field management:
wherein, the field management steps are as follows:
s1, topping the tobacco plants growing to more than 120 cm.
S2, after topping, spraying one of gibberellin, potassium nitrate and a combination thereof on the faster maturing leaves in the upper leaves belonging to the same tobacco plant.
S3, after spraying for 14 days, the tobacco leaves of the same tobacco plant are collected at one time.
The method for controlling the consistent maturity of partial tobacco leaves as described above further describes that the faster maturing leaf in the upper leaf of the same tobacco plant is the second group of leaves.
The method specifically comprises the following steps: dividing the 1 st to 3 rd tobacco plant top from top to bottom into a first group of blades, and dividing the 4 th to 6 th tobacco plant top from top to bottom into a second group of blades.
The method for controlling the consistent maturity of partial tobacco leaves is further explained as beginning to spray one of gibberellin, potassium nitrate and a combination thereof on faster maturing leaves belonging to the same tobacco plant.
Specifically, the spraying time is respectively 20 days, 25 days and 30 days after topping.
The spraying period is before 9 am or after 5 pm.
If the spraying is rained within 12 hours after the spraying, the spraying is carried out again.
The method for controlling the consistent maturity of partial tobacco leaves is further explained as beginning to spray one of gibberellin, potassium nitrate and a combination thereof on faster maturing leaves belonging to the same tobacco plant.
Specifically, the spraying mode is to carry out double-sided spraying on leaves, and the spraying amount is 50ml per plant.
The method for controlling the consistent maturity of partial tobacco leaves is further explained as one of gibberellin and potassium nitrate spraying and a combination of gibberellin and potassium nitrate spraying. Specifically, the following components are mixed in water:
potassium nitrate is 0g/L-1 g/L;
gibberellin 0-30 μmol/L.
The method for controlling the consistent maturity of partial tobacco leaves is further explained as one of gibberellin and potassium nitrate spraying and a combination of gibberellin and potassium nitrate spraying. Specifically, the following components are mixed in water:
the potassium nitrate content is one of 0g/L, 0.5g/L and 1 g/L;
the gibberellin content is one of 0. mu. mol/L, 15. mu. mol/L, and 30. mu. mol/L.
The method for controlling the consistent maturity of partial tobacco leaves as described above, further comprising:
the row spacing of the tobacco plants in the field is controlled to be 110-130cm, and the plant spacing is controlled to be 45-55 cm.
The method for controlling the consistent maturity of partial tobacco leaves as described above, further comprising:
the tobacco plant planting environment is selected as follows: belongs to subtropical plateau climate areas with the annual average temperature of 13-17 ℃ and the frost-free period of more than 260 days.
The tobacco plant planting soil is selected from sandy loam with pH of 5-6. And per kilogram of soil has:
the organic matter content is 35-50 g; the total nitrogen content is 0.5-1 g; the content of alkaline hydrolysis nitrogen is 120-140 mg; the total phosphorus content is 0.5-1.5 g; the effective phosphorus content is 9-15 mg; the total potassium content is 10-20 g; the content of the quick-acting potassium is 70-110 mg.
The method for controlling the consistent maturity of partial tobacco leaves as described above, further comprising:
130 kg of fertilizer nitrogen, 220kg of phosphorus pentoxide and 410kg of potassium oxide are applied per hectare.
Wherein 60-80% is used for base fertilizer and 20-40% is used for additional fertilization.
The invention has the beneficial effects that:
according to the invention, potassium nitrate and gibberellin are sprayed on the leaf surface, so that the senescence of the 4 th to 6 th tobacco leaves on the upper part from top to bottom can be delayed, the growth period is prolonged, and the purpose of synchronously maturing the 1 st to 3 th tobacco leaves on the top is achieved.
The method for planting tobacco plants can obviously improve the overall quality of the cured tobacco leaves and solve the problems of uneven color and large thickness difference after curing caused by the quality reduction of the cured tobacco leaves due to large maturity difference among leaves.
The tobacco plants planted according to the method of the invention are beneficial to improving the unit price of the tobacco leaves and promoting the agricultural income.
Detailed Description
The following provides an implementation example of the present invention, and in the following example, only one example is implemented according to the core idea of the present invention, and the protection scope of the present invention is not limited thereto.
In the example, the tobacco leaves of the same tobacco plant are distinguished and managed, and good field management such as soil fertilization is assisted, so that the tobacco leaves of the same tobacco plant are synchronously mature.
The tobacco plant is firstly matured in the 4 th to 6 th tobacco leaves from top to bottom after topping, and is matured in the later period of the 1 st to 3 rd tobacco leaves from top to bottom, and the same tobacco plant is simultaneously picked during picking, so that the maturity of the picked tobacco leaves is different, the quality of the flue-cured tobacco leaves is reduced, the color is uneven, and the thickness difference appears. Research shows that the quality and economic characters of the upper leaves after being baked can be improved by harvesting the upper 6 leaves of the same tobacco plant at one time.
The method for improving the quality and the economy of the upper leaves after baking comprises the steps of tobacco plant planting and field management.
1. And (5) planting tobacco plants.
Selecting the flue-cured tobacco variety: zhongchuan 208.
Selecting an environment: belongs to subtropical plateau climate areas with the annual average temperature of 13-17 ℃ and frost-free period of more than 260 days;
the soil for planting tobacco plants is sandy loam with the pH value of 5-6, and per kilogram of soil has the following characteristics: the organic matter content is 35-50 g; the total nitrogen content is 0.5-1 g; the content of alkaline hydrolysis nitrogen is 120-140 mg; the total phosphorus content is 0.5-1.5 g; the effective phosphorus content is 9-15 mg; the total potassium content is 10-20 g; the content of the quick-acting potassium is 70-110 mg.
For example, the national Luzhou city Chinese iris county village seedling family village has an average altitude of 1021m and belongs to subtropical plateau climate areas; the annual average temperature is 15.9 ℃, the frost-free period is more than 260 days, and the method is suitable for the growth of crops. The test field is sandy loam, and the basic physicochemical properties are as follows: the pH value is 5.03, the organic matter content is 41.67g/kg, the total nitrogen content is 0.8g/kg, the alkaline hydrolysis nitrogen content is 129.97mg/kg, the total phosphorus content is 0.97g/kg, the effective phosphorus content is 12.73mg/kg, the total potassium content is 16.77g/kg, and the quick-acting potassium content is 96.18 mg/kg.
In the test soil, nitrogen, phosphorus pentoxide, and potassium oxide were applied as base fertilizers in advance, and after a certain stage of growth, nitrogen, phosphorus pentoxide, and potassium oxide were applied. The total fertilizing amount in the whole process is as follows: 130 kg of fertilizer nitrogen, 220kg of phosphorus pentoxide and 410kg of potassium oxide are applied per hectare. Wherein, 60-80% is used for base fertilizer, and 20-40% is used for additional fertilization. A preferred example is 70% for base fertilizer and 30% for top dressing.
The row spacing of the tobacco plants in the field is controlled to be 110-130cm, and the plant spacing is controlled to be 45-55 cm. One example of a preference is: the row spacing is 120cm multiplied by 50 cm.
2. And (5) field management.
(1) And (4) topping, namely after the tobacco plants are planted, growing to be more than 120cm, and topping the tobacco plants. Preferably, the top is formed within the range of 130-140 cm.
(2) After topping, gibberellin and potassium nitrate are sprayed, either alone, or as potassium nitrate, or as a mixture of both, and the mixture is added into water for wine spraying. Potassium nitrate 0g/L, 0.5g/L, 1g/L, and gibberellin content 0. mu. mol/L, 15. mu. mol/L, 30. mu. mol/L. The two components are mixed for use.
When gibberellin and potassium nitrate are sprayed, the method mainly aims at the faster maturing leaves in the upper leaves belonging to the same tobacco plant, particularly the 4 th to 6 th leaves from top to bottom at the top, and the 4 th to 6 th leaves are the faster maturing leaves, and the example is marked as a second group of leaves. The spraying mode is double-sided spraying aiming at the leaves, and the spraying amount is 50ml per plant. The 1 st to 3 rd leaves at the top of the tobacco plant are divided into a first group of leaves, and when the tobacco plant is sprayed, the medicine is prevented from being sprayed on the first group of leaves.
Spraying time is respectively carried out on 20 th day, 25 th day and 30 th day after topping; if the rain is encountered within 12 hours after the spraying, the spraying needs to be carried out again. The spraying time period is any time period before 9 am and after 5 pm, and is, of course, within the daytime period, for example, from 6 am to 9 am and from 5 pm to 7 pm.
(3) After 14 days of spraying, the tobacco leaves of the same tobacco plant can be harvested at one time.
In the above example, the gibberellin and potassium nitrate may be sprayed alone, or both may be mixed, and the mixture may be mixed with water to be sprayed with wine. Potassium nitrate is 0g/L, 0.5g/L and 1g/L, and gibberellin content is 0 mu mol/L, 15 mu mol/L and 30 mu mol/L, and the two components are mixed for use. The specific amounts of the two components to be formulated, as well as other important parameters of the spray application, are obtained by the following exemplary method.
This experiment designed 3 factors, three levels for each factor, factor a: potassium nitrate (0g/L, 0.5g/L, 1g/L), factor B: gibberellins (0. mu. mol/L, 15. mu. mol/L, 30. mu. mol/L), factor C: spraying time (20 d, 25d and 30d after topping). Each test factor and level were combined by design to give 16 different level combinations as shown in table 1.
TABLE 1 plan design and factor level combination table
Figure BDA0003438174860000041
Figure BDA0003438174860000051
The area of each planting district of the test field is 36m2, and the row spacing is 120cm multiplied by 50 cm. Pure N, P2O5 and K2O are applied to each hectare of the test field, wherein the amounts of the pure N, P O5 and the pure K2O are 132.15kg, 217.5kg and 402kg respectively, and other field management is carried out according to local conventional measures. The potassium nitrate used in the tests was produced by Hebei Baihe Feng chemical fertilizer Co., Ltd, and the gibberellin was produced by Beijing Soraoxide Macco technology Co., Ltd. Spraying treatment is carried out on the second group of leaves 20d, 25d and 30d after topping.
On the 14 th day after the last spraying treatment, the first group of leaves and the second group of leaves of each tobacco plant in each district are picked, a part of tobacco leaves are removed from the main vein and the branch vein, weighed and then immediately placed in a liquid nitrogen tank for temporary storage, and then placed in an ultra-low temperature refrigerator at minus 80 ℃ for storage for testing physiological indexes. Deactivating enzyme of the other part of tobacco leaf at 115 deg.C for 30min, oven drying at 85 deg.C to constant weight, and determining starch content.
Primary flue-cured tobacco leaf collection: and (4) performing one-time harvesting (and processing the components according to the test) and baking on the first group of leaves and the second group of leaves 14 days after the treatment.
3kg of roasted tobacco leaves are selected for each test treatment group to carry out appearance quality evaluation and chemical component determination, and the influence of gibberellin and potassium nitrate spraying on the synchronous maturity of the first group of leaves and the second group of leaves is obtained as shown in the following table 2.
Table 2 Absolute difference between indexes of the first and second groups of test processing groups (| Td1-Td2|, wherein the first and second groups of blades are Td1 and Td2)
Figure BDA0003438174860000052
Figure BDA0003438174860000061
The raw data of the leaves in each test processing group "Td 1" and "Td 2" are subjected to dimensionless processing, the absolute values (| Td1-Td2|) of the index differences of the leaves in different test processing groups "Td 1" and "Td 2" are calculated, and the absolute values of the index differences are summed to obtain a "synchronized maturity value", the result is shown in table 2. As can be seen from the table, the simultaneous maturation values of the test treatment groups T2(0.16), T9(0.16) and T16(0.17) were the smallest, and were most favorable for achieving simultaneous maturation of the upper leaves. Compared with the T4, the synchronous maturity value is the largest, and the maturity state difference between the upper leaves is the largest, so that the condition that the senescence of the 4 th to 6 th leaves from top to bottom of the upper leaves can be delayed by matching with the gibberellin and potassium nitrate spraying 20 to 30 days after topping can be inferred, the maturity state difference between the 'Td 1' leaves and the 'Td 2' leaves can be reduced, and the synchronous maturity of the 6 upper leaves of flue-cured tobacco is promoted.
In the test, 3kg of flue-cured tobacco leaves are selected for each test treatment group to carry out appearance quality evaluation and chemical component determination, and the influence of gibberellin and potassium nitrate spraying on the comprehensive evaluation scores of the flue-cured tobacco leaves of the first group and the flue-cured tobacco leaves of the second group is obtained, and the influence is shown in the following table 3.
TABLE 3 comprehensive evaluation score chart for flue-cured tobacco leaves
Figure BDA0003438174860000062
Figure BDA0003438174860000071
As can be seen from the above table, the overall score for trial T9 was at most 79.86 points, followed by trial T11(79.69), trial T2(78.95), and trial T15 (78.91); the lowest overall score for trial T4(CK) was 72.66, followed by trial T6(74.35) and trial T3 (75.38). Therefore, in 25 days after topping, 15 mu mol/L gibberellin and 0.5g/L potassium nitrate are sprayed on the leaf surfaces, and the comprehensive evaluation score of the flue-cured tobacco leaves is highest.
The lower the synchronous mature value is, the higher the quality of the corresponding roasted tobacco leaves is, because the better the synchronous mature state of the upper 6 fresh tobacco leaves is. Thus, the optimum potassium nitrate concentration, gibberellin concentration, and spray time were obtained by the following table. Reference is made to table 5 below.
TABLE 5 comprehensive upper leaf score
Figure BDA0003438174860000072
Figure BDA0003438174860000081
As shown in table 5, with trial T9 scoring highest, followed by trial T2 and trial T16; the blank treatment group T4 showed the lowest score, and it was thus demonstrated that the simultaneous maturation of the upper leaves "Td 1" and "Td 2" could be promoted by the combined application of potassium nitrate and gibberellin after topping, and the overall score of the upper tobacco leaves could be improved.
For the response surface analysis of the comprehensive scores of the upper leaves in different spraying treatments, the significance test table comprising the regression model coefficients performs significance test on each coefficient of the regression equation, and the obtained result is that potassium nitrate is a decisive factor influencing the comprehensive scores of the upper leaves and gibberellin is used secondly.
The interaction between the action of gibberellin and the action of potassium nitrate is strong through the response surface and contour line of the comprehensive score of each factor interaction on the upper leaves; the interaction between the action of gibberellin and the wine spraying time and between the action of potassium nitrate and the wine spraying time is weak. The action of potassium nitrate has the greatest effect on the comprehensive score of the upper leaves, and the effect is remarkable, followed by the action of gibberellin.
And finally, obtaining the optimal factor level combination of the comprehensive scores of the upper tobacco leaves of each test treatment group, wherein when the concentration of potassium nitrate is 0.65g/L, the concentration of gibberellin is 19.75 mu mol/L, and the spraying time is 28 days after topping, the comprehensive score of the upper tobacco leaves is the highest, and the acceptability is 88.7%.
The contents of chlorophyll, soluble protein and proline in the sprayed tobacco leaves 25 days after topping are increased, the SOD enzyme activity is improved, and the malondialdehyde content is reduced, which indicates that the aging degree of the sprayed tobacco leaves is reduced. The gibberellin can promote the extension and growth of tobacco plant internodes, cell division and differentiation, extension and the like, and can also inhibit the activity of IAA oxidase, so that the gibberellin can achieve the effect of delaying senescence. Meanwhile, the potassium guarantees the good quality of the tobacco leaves, can improve the root system activity of the tobacco leaves, and enhances the absorption and transportation efficiency of the tobacco leaves on underground nutrients, so that the aging of the 4 th to 6 th tobacco leaves from top to bottom can be delayed.
The coordination of the chemical components of the tobacco leaves has great influence on the smoke characteristics and the smoking quality of the tobacco leaves, and the coordination of the chemical components is an important measure for improving the quality of the baked tobacco leaves. In the example, the color of the tobacco leaves treated by spraying potassium nitrate and gibberellin is more preferred to be orange yellow, and the appearance quality and the chemical component score are higher than those of the control. After gibberellin and potassium nitrate are sprayed, potassium, soluble total sugar and reducing sugar of the tobacco leaves treated in each test are in an ascending trend, wherein the potassium content of the tobacco leaves treated by spraying 0.5g/L potassium nitrate and 15 mu mol/L gibberellin is increased to the highest level 25 days after topping, the potassium content is 3.15%, and the potassium-chlorine ratio is 7.7; the total nitrogen, nicotine, chloride ion and starch contents in the tobacco leaves of each test treatment group are reduced compared with the control, the scores of the comprehensive evaluation of the appearance quality and the chemical components are highest when 0.5g/L potassium nitrate and 15 mu mol/L gibberellin are sprayed 25 days after topping (79.86), and the score of the control is lowest (72.66). After gibberellin or potash fertilizer is sprayed on the leaf surfaces, the area of the upper tobacco leaves is increased, the thickness is reduced, the transformation of starch, total nitrogen and the like contained in the upper tobacco leaves is more thorough, and the chemical component coordination is better. Response surface analysis shows that the effect of potassium nitrate on the 4 th to 6 th tobacco leaves on the upper part from top to bottom is higher than that of gibberellin.
The above are examples of the practice of the invention. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A method for controlling the consistent maturity of partial tobacco leaves is used for controlling the growth of tobacco plants and is characterized by comprising the following steps of planting and field management:
wherein, the field management steps are as follows:
s1, topping the tobacco plants growing to more than 120 cm;
s2, after topping, spraying one of gibberellin, potassium nitrate and a combination thereof on the faster-maturing leaves in the upper leaves belonging to the same tobacco plant;
s3, after spraying for 14 days, the tobacco leaves of the same tobacco plant are collected at one time.
2. The method of controlling the consistent maturation of a portion of tobacco leaves according to claim 1, wherein the faster maturing leaf in the upper leaf of the same tobacco plant is a second set of leaves;
the method specifically comprises the following steps: the 1 st to 3 rd blades at the top of the tobacco plant are divided into a first group of blades from top to bottom, and the 4 th to 6 th blades from top to bottom are divided into a second group of blades.
3. The method for controlling the consistent ripening of the partial tobacco leaves according to claim 1, wherein the spraying of one of gibberellin and potassium nitrate and combinations thereof is initiated against faster-maturing leaves belonging to the same tobacco plant, and specifically is as follows:
spraying time is respectively carried out on 20 th day, 25 th day and 30 th day after topping;
the spraying time period is any time period before 9 am and after 5 pm; if the spraying is rained within 12 hours after the spraying, the spraying is carried out again.
4. The method for controlling the consistent maturity of partial tobacco leaves according to claim 1, wherein one of gibberellin and potassium nitrate and combinations thereof is sprayed to the faster maturing leaves belonging to the same tobacco plant in a manner of spraying the leaves on both sides in an amount of 50 ml/plant.
5. The method for controlling the consistent ripening of the partial tobacco leaves according to claim 1, wherein the spraying of one of gibberellin and potassium nitrate and combinations thereof is specifically by blending in water:
potassium nitrate is 0g/L-1 g/L;
gibberellin 0-30 μmol/L.
6. The method for controlling the consistent ripening of a portion of tobacco leaves according to claim 1, wherein said spraying is one of gibberellin and potassium nitrate and combinations thereof; specifically, the following components are mixed in water:
the potassium nitrate content is one of 0g/L, 0.5g/L and 1 g/L;
the gibberellin content is one of 0. mu. mol/L, 15. mu. mol/L, and 30. mu. mol/L.
7. The method of controlling the consistent ripening of a portion of tobacco leaves according to claim 1, wherein said planting further comprises: the row spacing of the tobacco plants in the field is controlled to be 110-130cm, and the plant spacing is controlled to be 45-55 cm.
8. The method of controlling the consistent ripening of a portion of tobacco leaves according to claim 1, wherein said planting further comprises:
the tobacco plant planting environment is selected as follows: belongs to subtropical plateau climate areas with the annual average temperature of 13-17 ℃ and frost-free period of more than 260 days;
the tobacco plant planting soil is selected to be sandy loam with the pH value of 5-6,
and per kilogram of soil has:
the organic matter content is 35-50 g; the total nitrogen content is 0.5-1 g; the content of alkaline hydrolysis nitrogen is 120-140 mg; the total phosphorus content is 0.5-1.5 g; the effective phosphorus content is 9-15 mg; the total potassium content is 10-20 g; the content of the quick-acting potassium is 70-110 mg.
9. The method of controlling the consistent ripening of a portion of tobacco leaves according to claim 8, wherein said planting further comprises:
130 kg of fertilizer nitrogen, 220kg of phosphorus pentoxide and 410kg of potassium oxide are applied per hectare;
wherein 60-80% is used for base fertilizer and 20-40% is used for additional fertilization.
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