CN114651836B - Preparation method and application of straw-source tobacco water - Google Patents

Preparation method and application of straw-source tobacco water Download PDF

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CN114651836B
CN114651836B CN202210364632.0A CN202210364632A CN114651836B CN 114651836 B CN114651836 B CN 114651836B CN 202210364632 A CN202210364632 A CN 202210364632A CN 114651836 B CN114651836 B CN 114651836B
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seeds
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CN114651836A (en
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李岩
张文豪
许佳成
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Shandong Agricultural University
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
    • A01N65/40—Liliopsida [monocotyledons]
    • A01N65/44—Poaceae or Gramineae [Grass family], e.g. bamboo, lemon grass or citronella grass
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
    • 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
    • A01G13/00—Protecting plants
    • 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
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

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Abstract

The invention discloses a preparation method and application of straw source tobacco water. The preparation method of the straw source tobacco water comprises the following steps: (1) Taking crop straws as raw materials, heating to 200-220 ℃ at a heating rate of less than 5 ℃/min under an anoxic condition, and continuously pyrolyzing for 1.5-2.5h; (2) And (4) leaching and dissolving the flue gas generated by pyrolysis in water to obtain the straw source flue gas water. According to the invention, the straw-source flue gas water is prepared by adopting a double-low pyrolysis method (low heating rate and low pyrolysis temperature), so that the pyrolysis of cellulose and hemicellulose in the straw is increased, and the pyrolysis of lignin is reduced, thereby preparing the high-quality flue gas water with good and stable effect. The straw source tobacco water has the effects of remarkably promoting the dormancy release and germination of seeds and promoting the absorption of nitrogen and phosphorus elements by crops; can be used for preventing and controlling farmland weeds by a strategy of 'exhausting' a soil seed bank, and is used for seedling raising of vegetables, chinese herbal medicines and the like and seed treatment in field crop production of wheat, corn and the like.

Description

Preparation method and application of straw-source tobacco water
Technical Field
The invention relates to the technical field of pyrolysis preparation of tobacco water, and particularly relates to a preparation method and application of straw-source tobacco water.
Background
Crop straws are a valuable renewable resource, and the main components are cellulose, hemicellulose and lignin. About 8 hundred million tons of straws are produced annually in China, the comprehensive utilization rate of the straws reaches 86%, but more than 1 hundred million tons of straws are still discarded annually, and serious resource waste is caused.
The smoke water is prepared by dissolving smoke generated by burning/pyrolyzing plants in water. The tobacco water has complex components and contains more than 5000 compounds, wherein Karrikins (KARs for short) and cyanohydrin can effectively promote seed germination, and trimethylbutenolide (TMB for short) can inhibit seed germination. KARs are produced by combustion/pyrolysis of cellulose and hemicellulose, whereas lignin combustion/pyrolysis can produce seed germination inhibiting substances. Due to different plant raw materials and preparation methods, the effects of the tobacco water from different sources are often different, and the application of the tobacco water is limited.
The pyrolysis parameters of the three components of cellulose, hemicellulose and lignin are different. The billionths study (2013) suggested that hemicellulose is the least thermally stable and begins to pyrolyze at about 220 ℃; the pyrolysis temperature range of the cellulose is narrow, the cellulose is decomposed at 300-375 ℃, and the temperature rise rate is lower than 2 ℃/min, so that the main pyrolysis interval of the cellulose pyrolysis can be moved down to 230-280 ℃; the lignin has the most complex structure and wider pyrolysis temperature, decomposes at 250-500 ℃ and decomposes faster at 310-420 ℃. Kilzer (1965) proposed that there are two competing routes for cellulose pyrolysis, with low heating rates allowing cellulose pyrolysis in the 200-280 ℃ range, and with increasing temperature rates, the pyrolysis moves toward the high temperature zone. The difference of thermal decomposition parameters can be utilized to produce high-quality tobacco water by an accurate temperature control pyrolysis method.
Weeds are extremely harmful to agricultural production, and cause the yield of crops to be reduced by about 10 percent every year. Chemical control with herbicides as the core is the main means of weed control today, but it presents a serious environmental hazard. Difficulty in weed control is related to complexity of a soil seed bank, a large number of seeds with various varieties are accumulated in soil for a long time, and dormancy degrees of the seeds are different, so that seedling emergence is scattered, and control is not facilitated (Qianglun, 2010). The farmland weed seed bank is a dynamic system, and has input and output simultaneously, wherein the input is mainly based on mature weed fructification, and the output is mainly based on seed germination and death. When the input quantity is larger than the output quantity, the seed bank is enlarged, the harm of the weeds is increased, otherwise, the seed bank is reduced, and the harm is reduced. Under the condition of stable input, measures are taken to promote the germination of seeds in the soil seed bank, reduce the number of weed live seeds in the soil seed bank, reduce the weeding cost and reduce the environmental pollution, and have important economic and social values.
Seed treatment technology is widely applied in agricultural production. Seed treatment can improve seed quality, improve sowing quality, prevent and control seed-borne or soil-borne diseases, promote seeds to rapidly germinate, ensure the seedlings to be tidy and robust, and reduce the use amount of seeds, pesticides and fertilizers (Zhang et al, 2012). The seed treatment technology mainly comprises a chemical method, a physical method, a biological method and the like. Chemical treatment is a commonly used seed treatment method at present, mainly referring to the treatment of seeds with insecticides, bactericides, plant growth regulators and the like (Zhang et al, 2012). Plum fruitStudies on Zhifei et al (2014) found that GA 3 The treatment with salicylic acid can improve the seed activity of bupleurum chinense seeds, promote the germination of the seeds, improve the emergence rate, improve the root activity and ensure higher seedling survival rate. He Li et al (2018) found that different concentrations of GA were used 3 The tomato seeds are treated, so that the plant height, stem thickness and fresh weight of the overground part of the seedlings can be improved, and the growth of the seedlings is promoted.
Because the substances promoting the seed germination in the tobacco water are generated by burning/pyrolyzing cellulose and hemicellulose, the lignin can generate inhibiting substances by burning/pyrolyzing the lignin, and the crop straws all contain three components of the cellulose, the hemicellulose and the lignin, the tobacco water produced by burning the straws has poor and unstable effect at present, and the application of the straw source tobacco water in the agricultural field is limited.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide straw-source tobacco water and a preparation method and application thereof. According to the invention, the straw-source tobacco water is prepared by adopting a double-low pyrolysis method (low heating rate and low pyrolysis temperature), so that the pyrolysis of cellulose and hemicellulose in the straw is increased, and the pyrolysis of lignin is reduced, thereby preparing the high-quality tobacco water with good and stable effects. The straw source tobacco water has the effects of remarkably promoting the dormancy release and germination of seeds and promoting the absorption of nitrogen and phosphorus elements by crops; can be used for controlling farmland weeds by a strategy of 'depleting' a soil seed bank; can also be used for seedling raising of vegetables, chinese herbal medicines and the like and seed treatment in field crop production of wheat, corn and the like.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of straw-source smoke water, which comprises the following steps:
(1) Taking crop straws as raw materials, heating to a set temperature of 200-220 ℃ under an anoxic condition, and continuously pyrolyzing for 1.5-2.5h;
(2) And (3) leaching the flue gas generated in the pyrolysis process in water to prepare the straw source flue gas water.
Preferably, in the step (1), the heating rate is lower than 5 ℃/min; more preferably, the rate of temperature rise is 2 to 4 ℃/min.
Preferably, in step (1), the pyrolysis is continued for a period of 2h.
Preferably, the mass ratio of the crop straws in the step (1) to the water in the step (2) is 1.
In a second aspect of the invention, the straw-source tobacco water prepared by the method is provided.
In a third aspect of the present invention, there is provided a use of the straw-derived liquid tobacco as described above in at least one of the following (1) to (4):
(1) Breaking seed dormancy;
(2) Promoting seed germination;
(3) Promoting the growth of plants;
(4) Improve the absorption of nitrogen and phosphorus elements by plants.
In a fourth aspect of the invention, the application of the straw source tobacco water in weed control is provided.
In the application, the straw source tobacco water realizes the weed control by promoting the germination of weed seeds in the soil seed bank and reducing the number of weed live seeds in the soil seed bank.
In a fifth aspect of the invention, there is provided a method of controlling weeds in a field comprising the steps of:
after the straw source tobacco water is diluted by 2000-3000 times, the straw source tobacco water is uniformly applied to a farmland to be treated through irrigation, the germination of weed seeds is promoted, and weeding is completed before the weeds are fructified.
In a sixth aspect of the present invention, there is provided a method for treating crop seeds, comprising the steps of:
after the straw source tobacco water is diluted by 500-1000 times, the straw source tobacco water is used as an initiating solution to initiate crop seeds for 10-12h, and the weight ratio of the straw source tobacco water to the crop seeds is 1-6.
By adopting the seed treatment method, the dormancy of the crop seeds can be effectively broken, and the seed germination is promoted.
The invention has the beneficial effects that:
(1) According to the invention, according to the difference of pyrolysis characteristics of cellulose, hemicellulose and lignin, the straw source tobacco water is prepared by a double-low pyrolysis method (low heating rate and low temperature pyrolysis), so that the pyrolysis of the cellulose and the hemicellulose in the straw is increased, the pyrolysis of the lignin is reduced, and the high-quality tobacco water with good and stable effect is prepared.
(2) The straw source tobacco water prepared by the method is diluted by 500-1000 times and used as a seed imbibition solution or a seed initiator, so that the seed dormancy can be broken, the seed germination and seedling growth can be obviously promoted, the absorption of nitrogen and phosphorus elements by crop plants can be obviously improved, and the biomass and yield of the whole plant can be increased.
(3) The straw source tobacco water prepared by the method is diluted by 2000-3000 times and uniformly applied to soil, so that the germination of seeds in a soil seed bank can be promoted, the number of weed live seeds in the soil seed bank is reduced, farmland weeds are prevented and controlled by a strategy of 'exhausting' the soil seed bank, the weeding cost can be reduced, the environmental pollution is reduced, and the straw source tobacco water has important economic and social values.
Drawings
FIG. 1: the straw source tobacco water indoor treatment green bristlegrass seed germination test results prepared in different embodiments.
FIG. 2: the growth conditions of weeds in the field after the straw source tobacco water prepared in different embodiments is used for treating the farmland, wherein corn is arranged in the middle of each ridge; t2, T4, T5, T6 are the smoke water treatments prepared in example 2, example 4, example 5 and example 6, respectively; + CK is a positive control for tobacco water treatment with filter paper (cellulose 99%); CK is a negative control for water treatment.
FIG. 3: statistics of the number of weeds in farmland treated by straw-derived flue gas water prepared in different embodiments; t2, T4, T5, T6 are the smoke water treatments prepared in example 2, example 4, example 5 and example 6, respectively; + CK is a positive control for tobacco water treatment with filter paper (cellulose accounts for 99%); CK is a negative control for water treatment; the black dots in the figure represent the different sampling points.
FIG. 4: effect of seed treatment with straw-derived tobacco water initiation on corn yield as prepared in example 2.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background art, since the seed germination promoting substances (such as KARs) in the flue gas water are generated by combustion/pyrolysis of cellulose and hemicellulose, the combustion/pyrolysis of lignin can generate inhibiting substances, and the straws of different crops contain three components with different contents, the straw-source flue gas water produced by taking the straws as the raw material has the problems of poor effect and instability.
Aiming at the technical problem, the invention improves and innovates the preparation method of the straw source tobacco water. The invention firstly provides a method for preparing high-quality crop straw source tobacco water by adopting a double-low pyrolysis method.
The double low pyrolysis method means: under the condition of oxygen deficiency (the oxygen content is less than or equal to 12%), heating to the low pyrolysis temperature at a low heating rate, and maintaining the low pyrolysis temperature for pyrolysis. Wherein:
the low heating rate means that the heating rate is required to be lower than 5 ℃/min during straw pyrolysis, and researches show that the difference of the heating rates causes the straw pyrolysis to move to different roads: the straws are carbonized due to low temperature rise rate, and simultaneously, the generated gas contains KARs and other substances for promoting seed germination; the high heating rate enables the straws to generate combustible gases such as tar, methane and the like. Through a large number of experiments, the temperature rise rate is controlled to be 2-4 ℃/min, and the gas generated by pyrolysis is more favorable for promoting the germination of seeds.
The low pyrolysis temperature refers to that the temperature of the pyrolysis furnace is set to be 200-220 ℃ according to the pyrolysis temperature difference of cellulose, hemicellulose and lignin, and pyrolysis is continuously carried out for 1.5-2.5h after the set temperature is reached.
In one embodiment of the invention, a method for preparing straw-derived tobacco water is provided, comprising the following steps:
taking crop straws as raw materials, heating to 200-220 ℃ under the anoxic condition, and continuously pyrolyzing for 1.5-2.5h; and (3) leaching the flue gas generated in the pyrolysis process in water to prepare the straw source flue gas water.
According to the invention, the smoke water is prepared by a double-low pyrolysis method (low heating rate and low temperature pyrolysis), so that the pyrolysis of cellulose and hemicellulose in the straw is increased, and the pyrolysis of lignin is reduced, thereby preparing the high-quality smoke water with good effect and stable content of effective components.
The research of the invention finds that compared with the method for preparing the tobacco water by directly burning the straw raw material, the tobacco water prepared by pyrolysis has the capability of promoting the seed germination which is obviously better than that of the tobacco water prepared by burning.
The straw source smoke water prepared by the invention has various applications, and especially has outstanding effect on preventing and controlling weeds in fields. As described above, difficulty in weed control is related to complexity of a soil seed bank, and a large number of seeds with various varieties are accumulated in soil for a long time, and the degree of dormancy of the seeds is different, resulting in dispersion of emergence of seedlings, which is not favorable for control. The straw source tobacco water prepared by the invention is diluted and then applied to soil, so that weed seeds in the soil can germinate intensively, and then weeding is carried out before weed fructification. Therefore, the number of weed live seeds in the soil seed bank is reduced, the use of herbicides is reduced, the environmental pollution is reduced, and the method has important economic and social values.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention were all conventional in the art and commercially available. The experimental procedures without specifying the detailed conditions were carried out according to the conventional experimental procedures or according to the instructions recommended by the suppliers.
Example 1: preparation of straw source smoke water
Putting the wheat straws in a pyrolysis furnace, setting the pyrolysis temperature to be 180 ℃, heating to the set pyrolysis temperature of 180 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, and the volume fraction), and carrying out heat preservation and pyrolysis for 2h.
Collecting flue gas generated in the thermal-insulation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straws to the water is 1.
Example 2: preparation of straw source tobacco water
The method comprises the steps of putting wheat straws into a pyrolysis furnace, setting the pyrolysis temperature to be 200 ℃, heating to the set pyrolysis temperature of 200 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, the volume fraction), and carrying out heat preservation and pyrolysis for 2 hours.
Collecting flue gas generated in the heat preservation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straws to the water is 1.
Example 3: preparation of straw source smoke water
Putting the wheat straws in a pyrolysis furnace, setting the pyrolysis temperature to be 220 ℃, heating to the set pyrolysis temperature of 220 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, and the volume fraction), and carrying out heat preservation and pyrolysis for 2h.
Collecting flue gas generated in the thermal-insulation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straw to the water is 1.
Example 4: preparation of straw source tobacco water
Putting the wheat straws in a pyrolysis furnace, setting the pyrolysis temperature to be 240 ℃, heating to the set pyrolysis temperature of 240 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, and the volume fraction), and carrying out heat preservation and pyrolysis for 2h.
Collecting flue gas generated in the thermal-insulation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straws to the water is 1.
Example 5: preparation of straw source tobacco water
Putting wheat straws into a pyrolysis furnace, setting the pyrolysis temperature to be 300 ℃, heating to the set pyrolysis temperature of 300 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, and the volume fraction), and carrying out heat preservation and pyrolysis for 2h.
Collecting flue gas generated in the heat preservation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straws to the water is 1.
Example 6: preparation of straw source smoke water
Putting the wheat straws in a pyrolysis furnace, setting the pyrolysis temperature to be 360 ℃, heating to the set pyrolysis temperature of 360 ℃ at the heating rate of 2-4 ℃/min under the anoxic condition (the oxygen content is less than or equal to 12%, and the volume fraction), and carrying out heat preservation and pyrolysis for 2h.
Collecting flue gas generated in the thermal-insulation pyrolysis process, and dissolving the flue gas in water by a leaching method to obtain straw source flue gas water; the mass ratio of the wheat straws to the water is 1.
Test example 1: influence of straw-source tobacco water on weed seed germination
The seeds of Setaria viridis (L.) Beauv, collected in the same year, were used as the material and treated as follows:
t1: the smoke water prepared in example 1 was diluted 1000 times with distilled water as an imbibing solution, and the paper bed was germinated at 25 ℃,50 grains were repeated, and 3 repeats were set.
T2: the smoke water prepared in example 2 was diluted 1000 times with distilled water as an imbibing solution, and the paper bed was germinated at 25 ℃,50 grains were repeated, and 3 repeats were set.
T3: the smoke solution prepared in example 3 was diluted 1000 times with distilled water as an imbibing solution, germinated on a paper bed at 25 ℃,50 grains were repeated, and 3 repeats were set.
T4: the smoke solution prepared in example 4 was diluted 1000 times with distilled water as an imbibing solution, germinated on a paper bed at 25 ℃,50 grains were repeated, and 3 repeats were set.
T5: the smoke solution prepared in example 5 was diluted 1000 times with distilled water as an imbibing solution, germinated on a paper bed at 25 ℃,50 grains were repeated, and 3 repeats were set.
T6: the smoke water prepared in example 6 was diluted 1000 times with distilled water as an imbibing solution, and the paper bed was germinated at 25 ℃,50 grains were repeated, and 3 repeats were set.
CK: the same amount of distilled water was used as imbibing liquid, and the paper bed germinated at 25 deg.C, with 50 replicates each.
The germination of the seeds treated differently was examined and the results are shown in FIG. 1.
The results show that the germination rate and the germination rate of the T2 treated seeds are highest, and compared with a control, the germination rate of the green bristlegrass seeds is improved by 52.2 percent (8 days of germination).
Test example 2: prevention and control of straw source smoke and water on field weeds
The straw source tobacco water prepared in example 2, example 4, example 5 and example 6 is uniformly applied to farmland by irrigation according to the dosage of 2-3L/mu respectively, and the straw source tobacco water is diluted by 2000 times during application.
Using water with the same amount as that of irrigation as a blank control (-CK); the smoke water prepared by the method of example 2 was used as a positive control (+ CK) using filter paper (cellulose accounts for 99%) as a raw material.
The initial weed number of each treatment has no obvious difference, and the field management mode is kept consistent.
After 20 days of treatment, the germination of the weeds in the field was examined and the results are shown in FIGS. 2 to 3.
The result shows that the tobacco water prepared in the example 2 can obviously improve the germination rate of the weeds in the field, and the improvement amplitude can reach 135.4 percent (fig. 2 and 3). The weeds are weeded before the weeds are fructified, and the effective control of the weeds in the field can be realized.
Test example 3: influence of straw-derived tobacco water on corn growth
Treating the hybrid corn Zhengdan 958 seeds by using the straw-source tobacco water prepared in the example 2 as an initiator, wherein the weight ratio of the straw-source tobacco water to the seeds is 1; the initiating treatment is to dilute the tobacco water 1000 times, initiate the treatment for 12h, and then sow in the field.
Zhengdan 958 seeds of corn hybrid seeds which are not treated by smoke water are taken as a control and sowed in a field. The tobacco water initiation treatment and the field management of the control were kept consistent.
Measuring the nitrogen and phosphorus content and yield of the plant in the mature period of the corn, measuring the mass of the overground dry matter in the mature period of the corn, drying and weighing each organ on the ground, measuring the relative nitrogen/phosphorus content by a continuous flow analyzer, and calculating the absolute content by the mass of the dry matter of each organ multiplied by the relative nitrogen/phosphorus content. The results are shown in Table 1 and FIG. 4.
Table 1:
Figure BDA0003586537360000071
the results show that the tobacco water initiation treatment of the seeds can increase the amount of dry matter on the ground and obviously promote the absorption of nitrogen and phosphorus elements by plants (Table 1). The yield was 8.2% higher than the control (FIG. 4).
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, 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 application shall be included in the protection scope of the present application.

Claims (6)

1. A preparation method of straw-source tobacco water is characterized by comprising the following steps:
(1) Taking crop straws as raw materials, heating to a set temperature of 200-220 ℃ under an anoxic condition, and continuously pyrolyzing for 1.5-2.5h;
(2) Leaching and dissolving the flue gas generated in the pyrolysis process in water to prepare straw source flue gas water;
the anoxic condition is that the oxygen content is less than or equal to 12%;
in the step (1), the heating rate is 2-4 ℃/min;
the mass ratio of the crop straws in the step (1) to the water in the step (2) is 1.
2. The method according to claim 1, wherein in the step (1), the pyrolysis is continued for 2 hours.
3. The straw-derived liquid smoke produced by the production method according to claim 1 or 2.
4. The use of the straw-derived liquid smoke of claim 3 in (1) or (2) as follows:
(1) Weed control;
the straw source tobacco water realizes the control of weeds by promoting the germination of weed seeds in the soil seed bank and reducing the number of live weeds seeds in the soil seed bank;
(2) Improve the absorption of nitrogen and phosphorus elements by plants.
5. A method of controlling weeds in a field comprising the steps of:
after being diluted by 2000-3000 times, the straw-source tobacco water as claimed in claim 3 is uniformly applied to the farmland to be treated through irrigation, so as to promote the germination of weed seeds and complete weeding before the weeds are fruited.
6. A method of crop seed treatment, comprising the steps of:
diluting the straw-source tobacco water of claim 3 by 500-1000 times, and performing priming treatment on crop seeds for 10-12h as a priming solution; the weight ratio of the straw source tobacco water to the crop seeds is 1.
CN202210364632.0A 2022-04-08 2022-04-08 Preparation method and application of straw-source tobacco water Active CN114651836B (en)

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