CN109644808B - Flue-cured tobacco seedling raising substrate and seedling raising method adopting substrate - Google Patents
Flue-cured tobacco seedling raising substrate and seedling raising method adopting substrate Download PDFInfo
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- CN109644808B CN109644808B CN201910119715.1A CN201910119715A CN109644808B CN 109644808 B CN109644808 B CN 109644808B CN 201910119715 A CN201910119715 A CN 201910119715A CN 109644808 B CN109644808 B CN 109644808B
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- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 89
- 241000208125 Nicotiana Species 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 title claims description 41
- 239000002245 particle Substances 0.000 claims abstract description 21
- 240000008042 Zea mays Species 0.000 claims abstract description 20
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 20
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 20
- 235000005822 corn Nutrition 0.000 claims abstract description 20
- 229920001661 Chitosan Polymers 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000010902 straw Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 10
- 235000015097 nutrients Nutrition 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009331 sowing Methods 0.000 claims abstract description 7
- 230000001954 sterilising effect Effects 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000003337 fertilizer Substances 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000000855 fermentation Methods 0.000 claims description 7
- 230000004151 fermentation Effects 0.000 claims description 7
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 6
- 239000004155 Chlorine dioxide Substances 0.000 claims description 3
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 3
- 238000012258 culturing Methods 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010899 nucleation Methods 0.000 claims description 3
- 238000009406 nutrient management Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 abstract description 25
- 230000004083 survival effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 238000011282 treatment Methods 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 244000061176 Nicotiana tabacum Species 0.000 description 5
- 241000282326 Felis catus Species 0.000 description 4
- 239000003415 peat Substances 0.000 description 4
- 244000025254 Cannabis sativa Species 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009418 agronomic effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 244000299452 Gouania lupuloides Species 0.000 description 1
- 235000000292 Gouania lupuloides Nutrition 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012364 cultivation method Methods 0.000 description 1
- 238000012136 culture method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000024346 drought recovery Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/22—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing plant material
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/45—Tobacco
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Botany (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
- Cultivation Of Plants (AREA)
Abstract
The invention provides a flue-cured tobacco seedling raising matrix which comprises sawdust, corn straw particles, pearl powder and chitosan, and also provides a method for raising seedlings by adopting the matrix, which comprises the following steps: (1) decomposing and sterilizing; (2) loading and sowing; (3) managing water; (4) managing temperature, humidity and nutrients; (5) and hardening seedlings. The method has the advantages that the conventional seedling raising matrix turf for the flue-cured tobacco is replaced by the flue-cured tobacco seedling raising matrix which is low in cost and can be obtained from local materials; meanwhile, a seedling raising method which guides the production of the flue-cured tobacco and has strong root system activity, short seedling recovery period, high survival rate and strong stress resistance (especially strong drought resistance) is researched and formed, and a foundation is laid for the development of the flue-cured tobacco industry.
Description
Technical Field
The invention belongs to the technical field of tobacco cultivation methods, and particularly relates to a flue-cured tobacco seedling culture medium and a seedling culture method adopting the same.
Background
In the 90 s, the adoption of the nutrition bag for seedling culture wastes labor and time, and large-scale intensive production and the prevention of soil-borne diseases cannot be realized. In recent years, as the conventional seedling culture substrate peat flue-cured tobacco float seedling is popularized in a large area, soil-borne diseases are avoided, the uniform transplanting time is facilitated, tobacco leaves are mature and consistent, and centralized baking and purchasing are realized, but the seedling culture cost is high, the root system activity of the cultured tobacco seedlings is weak, the seedling culture period is long, the survival rate is low, the stress resistance is poor (especially the drought resistance), the seedling culture substrate material cannot be obtained locally, the resource is exhausted, the ecological balance is seriously damaged, because the peat is derived from the marsh wetland environment and is a very important non-renewable natural resource, the total storage amount is limited, excessive exploitation inevitably causes irreversible damage to the national wetland environment, and finally, the shortage of the seedling culture substrate material can also occur, so the exploitation of the peat is limited in a reasonable range in China.
Disclosure of Invention
In order to overcome the defects of high seedling raising cost, poor biological performance of the raised tobacco seedlings and the like caused by the fact that the cured tobacco seedlings are raised by adopting turf as a main component of a matrix in the prior art, the invention provides a cured tobacco seedling raising matrix and a seedling raising method adopting the matrix, and the aim of realizing the purpose is to research the cured tobacco seedling raising matrix which is low in cost and can be obtained from local materials to replace the turf of the conventional cured tobacco seedling raising matrix; meanwhile, a seedling raising method which guides the production of the flue-cured tobacco and has strong root system activity, short seedling recovery period, high survival rate and strong stress resistance (especially strong drought resistance) is researched and formed, and a foundation is laid for the development of the flue-cured tobacco industry.
In order to achieve the purpose, the flue-cured tobacco seedling raising substrate provided by the invention comprises sawdust, corn straw particles, pearl powder and chitosan. The invention discovers that the sawdust is matched with the corn straw particles, the pearl powder and the chitosan, so that the method is suitable for cultivating the flue-cured tobacco seedlings, and achieves the effects of locally taking materials, saving energy and reducing emission.
Furthermore, the volume ratio of the sawdust in the matrix is 40%, the volume ratio of the corn straw particles in the matrix is 40%, the volume ratio of the pearl powder in the matrix is 10%, and the volume ratio of the chitosan in the matrix is 10%. The specific optimized volume ratio not only can realize strong root activity of the tobacco seedlings, short seedling stage after transplantation, high survival rate, strong stress resistance (especially strong drought resistance), but also has the lowest cost, so that the tobacco seedlings have good popularization and application prospects.
The invention also provides a seedling raising method adopting the seedling raising substrate, which comprises the following steps: (1) decomposing and sterilizing
Fully decomposing and fermenting a substrate which is prepared by uniformly mixing sawdust, corn straw particles, pearl powder and chitosan according to the volume ratio, and then sterilizing the substrate material, a seedling tray, a seedling pool and a seedling shed by using 500ppm chlorine dioxide; the particle size of the corn straw particles is 1-3 mm;
(2) palletizing and seeding
Before the substrate is placed in a tray, applying the tobacco special seedling raising fertilizer in the substrate, adjusting the moisture content, holding the substrate to form a cluster, scattering the cluster when the cluster is touched, sowing 1-2 seeds in each hole, covering the substrate with a thickness of 0.5-1 cm after sowing, putting the cluster in a seedling raising pool or a seedling raising tray in time, and applying the tobacco special seedling raising fertilizer simultaneously;
(3) moisture management
The tobacco seedlings are grown in a floating mode before the major cross stage, the water content of the floating seedlings is fully exerted, and the early growth and quick growth of the tobacco seedlings and intensive management of a seedbed are facilitated; the tobacco seedlings are subjected to wet seedling culture after the big cross period, and only a layer of thin water is kept at the bottom of a seedling culture tray, so that the growth of root systems of the tobacco seedlings is promoted, and the aim of culturing healthy and strong flue-cured tobacco seedlings is fulfilled;
(4) temperature, humidity and nutrient management
Temperature: the temperature in the seedling raising shed is 12-35 ℃, and the temperature regulation and control are mainly realized by covering the film and heating and uncovering the film to cool;
humidity: the relative humidity in the seedling raising shed is kept between 70 and 80 percent;
nutrients: applying for 3 times, starting from the small cross period, applying according to the nitrogen concentration of 100mg/kg before each large cross period, and applying according to the nitrogen concentration of 250mg/kg after the large cross period;
(5) hardening off the seedlings
And (3) gradually forging the tobacco seedlings before transplanting, uncovering the film of the arched shed to ensure that the tobacco seedlings are completely contacted with the external environment, and hardening the seedlings for not less than 10 days.
The seedling raising method is matched with the seedling raising substrate, and adopts the method of floating seedling raising firstly and then wetting seedling raising, so that the problem that the seedlings cannot be raised well in arid areas is solved, and high-quality flue-cured tobacco seedlings can be cultured in the arid areas.
Further, the water content is kept between 60 and 80 percent during the fermentation in the step (1), and the fermentation time is more than 2 months.
Further, the amount of the special tobacco seedling raising fertilizer applied in the step (2) is 100mg/kg of nitrogen concentration. The specific and preferable fermentation time, moisture and fertilizing amount are the optimal selection for being matched with a seedling raising method and being capable of producing flue-cured tobacco seedlings in a mass production mode.
By adopting the technical scheme, the invention has the beneficial effects that: researches out that the conventional seedling raising matrix grass peat for the flue-cured tobacco is replaced by the flue-cured tobacco seedling raising matrix which is low in cost and can be obtained from local materials; meanwhile, a seedling raising method which guides the production of the flue-cured tobacco and has strong root system activity, short seedling recovery period, high survival rate and strong stress resistance (especially strong drought resistance) is researched and formed, and a foundation is laid for the development of the flue-cured tobacco industry.
Detailed Description
The first embodiment is as follows: the invention provides a flue-cured tobacco seedling raising substrate which comprises sawdust, corn straw particles, pearl powder and chitosan.
Furthermore, the volume ratio of the sawdust in the matrix is 40%, the volume ratio of the corn straw particles in the matrix is 40%, the volume ratio of the pearl powder in the matrix is 10%, and the volume ratio of the chitosan in the matrix is 10%.
The invention also provides a seedling raising method by adopting the substrate, which comprises the following steps: (1) decomposing and sterilizing
Fully decomposing and fermenting a substrate which is prepared by uniformly mixing sawdust, corn straw particles, pearl powder and chitosan according to the volume ratio, and then sterilizing the substrate material, a seedling tray, a seedling pool and a seedling shed by using 500ppm chlorine dioxide; the particle size of the corn straw particles is 1-3 mm;
(2) palletizing and seeding
Before the substrate is placed in a tray, applying the tobacco special seedling raising fertilizer in the substrate, adjusting the moisture content, holding the substrate to form a cluster, scattering the cluster when the cluster is touched, sowing 1-2 seeds in each hole, covering the substrate with a thickness of 0.5-1 cm after sowing, putting the cluster in a seedling raising pool or a seedling raising tray in time, and applying the tobacco special seedling raising fertilizer simultaneously;
(3) moisture management
The tobacco seedlings are grown in a floating mode before the major cross stage, the water content of the floating seedlings is fully exerted, and the early growth and quick growth of the tobacco seedlings and intensive management of a seedbed are facilitated; the tobacco seedlings are subjected to wet seedling culture after the big cross period, and only a layer of thin water is kept at the bottom of a seedling culture tray, so that the growth of root systems of the tobacco seedlings is promoted, and the aim of culturing healthy and strong flue-cured tobacco seedlings is fulfilled;
(4) temperature, humidity and nutrient management
Temperature: the temperature in the seedling raising shed is 12-35 ℃, and the temperature regulation and control are mainly realized by covering the film and heating and uncovering the film to cool;
humidity: the relative humidity in the seedling raising shed is kept between 70 and 80 percent;
nutrients: applying for 3 times, starting from the small cross period, applying according to the nitrogen concentration of 100mg/kg before each large cross period, and applying according to the nitrogen concentration of 250mg/kg after the large cross period;
(5) hardening off the seedlings
And (3) gradually forging the tobacco seedlings before transplanting, uncovering the film of the arched shed to ensure that the tobacco seedlings are completely contacted with the external environment, and hardening the seedlings for not less than 10 days.
Further, the water content is kept between 60 and 80 percent during the fermentation in the step (1), and the fermentation time is more than 2 months.
Further, the amount of the special tobacco seedling raising fertilizer applied in the step (2) is 100mg/kg of nitrogen concentration.
The following are some of the tests performed in the development of the substrate and the method for growing seedlings according to the invention: 1. flue-cured tobacco seedling raising mode and matrix proportioning test research
Aiming at the problems of strong and weak floating seedling tobacco seedlings, long seedling return period, no drought tolerance, low survival rate, high cost and the like in the flue-cured tobacco production in the prior art, the flue-cured tobacco seedling method and the substrate proportion test research are carried out. Two groups of regular comparison tests of floating seedling and wet seedling are respectively provided with 4 treatments, random block arrangement is adopted, and the three treatments are repeated; design table for substrate proportion
The test result shows that: the wet seedling culture is obviously superior to the floating seedling culture, wherein the proportion of 40% of sawdust, 40% of corn stalk crushed particles, 10% of pearl powder and 10% of chitosan is optimal on the premise of the wet seedling culture, so that the strong tobacco seedlings of the flue-cured tobacco can be cultured, and the adverse effects of rain and drought on the tobacco seedlings frequently encountered in the flue-cured tobacco transplanting period can be solved; not only reducing weeds, but also shortening the seedling stage by more than 4 days and improving the survival rate by 5 to 10 percent; not only can achieve the aim of cultivating healthy and strong flue-cured tobacco seedlings, but also can reduce the seedling cultivation cost by more than 50 yuan per mu; not only can use local materials, but also can change waste into valuables (especially sawdust), reduce the pollution to the environment and maintain ecological balance.
2. Seedling raising mode improvement and substrate ratio verification test
The floating seedling raising is adopted, namely the floating seedling raising and the wet seedling raising are combined for research, namely the floating seedling raising is adopted before the large cross stage of the tobacco seedling, and the wet seedling raising is adopted after the large cross stage of the tobacco seedling. The matrix was treated 2 times: 40% of sawdust, 40% of corn stalk crushed particles, 10% of pearl powder and 10% of chitosan; b, conventional turf matrix (CK) (the proportion of the matrix is volume ratio). Random block permutation was taken, three replicates.
The results show that: compared with a conventional grass carbon substrate (treatment B), the grass carbon substrate A has no weed, and the emergence rate and the survival rate are improved; the growth of the root system of the tobacco seedling can be obviously promoted, the developed degree of the root system of the tobacco seedling is improved, and the growth performance of the tobacco plant in the field is obviously better than that of the tobacco plant B treated by the control method; the treatment A promotes early growth and fast growth of tobacco plants in the early stage, shortens the field growth period of the tobacco plants by about 5 days, and improves each index of K326 field agronomic characters and the dry-fresh ratio of middle leaves; treatment A showed significant amplification of K326 economic traits, with 3.53%, 4.53%, 9.39% amplification on yield, yield and high and medium tobacco respectively. 40% of sawdust, 40% of corn stalk crushed particles, 10% of pearl powder and 10% of chitosan are used for growing K326 tobacco seedlings on the premise of floating wet seedling culture, the tobacco plants have the best performances in growth, growth period, agronomic characters, dry-fresh ratio of middle leaves and economic characters, and the method can be popularized and applied in production.
3. Test of different application doses and times of special seedling raising fertilizer nutrient solution for tobacco, comprising 40% of sawdust, 40% of corn stalk crushed particles, 10% of pearl powder and 10% of chitosan matrix
The influence test research of different application doses and application times of the special tobacco seedling raising fertilizer nutrient solution containing 40% of floating-wet flue-cured tobacco seedling raising sawdust, 40% of corn stalk crushed particles, 10% of pearl powder and 10% of chitosan matrix on the growth and development of tobacco seedlings is carried out. The application dosage (A) of the seedling raising fertilizer nutrient solution special for tobacco and the application frequency (B) of the seedling raising fertilizer nutrient solution special for tobacco are taken as test factors, and 4 levels and 3 levels are respectively set. The application dosage of the special seedling raising fertilizer nutrient solution for tobacco is as follows: 100mg/kg of A1, 150mg/kg of A2, 200mg/kg of A3 and 250mg/kg of A4. The application frequency of the special seedling raising fertilizer nutrient solution for tobacco is B1, namely 40 percent of small crosses are applied, and 60 percent of small crosses are applied in the cat ear period; b2: 30% of small crosses, 40% of large crosses and 30% of cat ears; b3: 20% is applied in the small cross stage, 30% is applied in the large cross stage, 40% is applied in the cat ear stage and 10% is applied in the 10d before transplanting. Complete crossover constitutes 12 treatments: A1B1, A1B2, A1B3, A2B1, A2B2, A2B3, A3B1, A3B2, A3B3, A4B1, A4B2, A4B3, A4B 4. 10 nursery trays were arranged for each treatment.
The test result shows that: the floating seedling raising of 40% of sawdust, 40% of crushed corn stalk, 10% of pearl powder and 10% of chitosan is carried out by applying 30% of small cross, 40% of large cross and 30% of cat ear in a three-time fertilizing method at the fertilizing amount of 200mg/kg, and the comprehensive quality of the tobacco seedling is optimal (developed white root system, dark green leaf color, thick and strong stem, no plant diseases and insect pests and the like).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A seedling raising method is characterized in that adopted seedling raising substrates comprise sawdust, corn straw particles, pearl powder and chitosan, wherein the volume ratio of the sawdust in the substrates is 40%, the volume ratio of the corn straw particles in the substrates is 40%, the volume ratio of the pearl powder in the substrates is 10%, and the volume ratio of the chitosan in the substrates is 10%;
the method comprises the following steps: (1) decomposing and sterilizing
Fully decomposing and fermenting a substrate which is prepared by uniformly mixing sawdust, corn straw particles, pearl powder and chitosan according to the volume ratio, and then sterilizing the substrate material, a seedling tray, a seedling pool and a seedling shed by using 500ppm chlorine dioxide; the grain size of the corn straw particles is 1-3mm, the water content is kept between 60-80% during the fermentation in the step (1), and the fermentation time is more than 2 months;
(2) palletizing and seeding
Before the substrate is placed in a tray, applying the tobacco special seedling raising fertilizer in the substrate, adjusting the moisture content, holding the substrate to form a cluster, dispersing the cluster when the cluster is touched, sowing 1-2 seeds in each hole, covering the substrate with a thickness of 0.5-1 cm after sowing, putting the cluster into a seedling raising pool or a seedling raising tray in time, and applying the tobacco special seedling raising fertilizer simultaneously, wherein the amount of the tobacco special seedling raising fertilizer applied in the step (2) is 100mg/kg of nitrogen concentration;
(3) moisture management
The tobacco seedlings are grown in a floating mode before the major cross stage, the water content of the floating seedlings is fully exerted, and the early growth and quick growth of the tobacco seedlings and intensive management of a seedbed are facilitated; the tobacco seedlings are subjected to wet seedling culture after the big cross period, and only a layer of thin water is kept at the bottom of a seedling culture tray, so that the growth of root systems of the tobacco seedlings is promoted, and the aim of culturing healthy and strong flue-cured tobacco seedlings is fulfilled;
(4) temperature, humidity and nutrient management
Temperature: the temperature in the seedling raising shed is 12-35 ℃, and the temperature regulation and control are mainly realized by covering the film and heating and uncovering the film to cool;
humidity: the relative humidity in the seedling raising shed is kept between 70 and 80 percent;
nutrients: applying for 3 times, starting from the small cross period, applying according to the nitrogen concentration of 100mg/kg before each large cross period, and applying according to the nitrogen concentration of 250mg/kg after the large cross period;
(5) hardening off the seedlings
And (3) gradually forging the tobacco seedlings before transplanting, uncovering the film of the arched shed to ensure that the tobacco seedlings are completely contacted with the external environment, and hardening the seedlings for not less than 10 days.
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| EP4087387A4 (en) * | 2020-01-08 | 2024-01-10 | North Carolina State University | A genetic approach for achieving ultra low nicotine content in tobacco |
| CN112514757B (en) * | 2021-01-26 | 2023-08-22 | 淮北师范大学 | Method for improving drought resistance of tobacco |
| CN114287312A (en) * | 2021-12-29 | 2022-04-08 | 广西中烟工业有限责任公司 | Flue-cured tobacco seedling raising matrix and wet seedling raising method adopting same |
| CN114402951A (en) * | 2022-02-17 | 2022-04-29 | 宜宾市农业科学院 | Flue-cured tobacco wet seedling raising substrate and seedling raising method thereof |
| CN114766321A (en) * | 2022-03-29 | 2022-07-22 | 伍优 | Tobacco tray dry-bed seedling raising substrate and method |
| CN114711113A (en) * | 2022-04-02 | 2022-07-08 | 中国烟草总公司广东省公司 | Tobacco seedling growing method by secondary filling of matrix |
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| CN106187613A (en) * | 2016-07-19 | 2016-12-07 | 华南农业大学 | One is used for purple soil flue-cured tobacco root system conditioning products and preparation method and application |
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