CN112500866A - Bentonite liquid mulching film and preparation method and application thereof - Google Patents
Bentonite liquid mulching film and preparation method and application thereof Download PDFInfo
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- CN112500866A CN112500866A CN202011363902.3A CN202011363902A CN112500866A CN 112500866 A CN112500866 A CN 112500866A CN 202011363902 A CN202011363902 A CN 202011363902A CN 112500866 A CN112500866 A CN 112500866A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/52—Mulches
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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
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0262—Mulches, i.e. covering material not-pre-formed in mats or sheets
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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
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/50—Cotton
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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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
- A01G13/00—Protecting plants
- A01G2013/004—Liquid mulch
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
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Abstract
The invention discloses a bentonite liquid mulching film and a preparation method and application thereof, the bentonite liquid mulching film comprises 300 parts of supernatant of bentonite dispersion liquid, 2-8 parts of montmorillonite, 11-37 parts of polyglutamic acid, 2-7 parts of acetic acid, 4-12 parts of polyvinyl alcohol, 5-10 parts of gum arabic and 300 parts of water, the montmorillonite, the polyglutamic acid (gamma-PGA) with strong hydrophilicity and the acetic acid are added into the bentonite dispersion supernatant, the bentonite adsorbs and complexes active ingredients to form a stable solution system, the liquid mulching film has the effects of water retention, soil moisture retention, temperature increase and cold protection, and is applied to cotton planting, and the result shows that the bentonite liquid mulching film provided by the invention can obviously improve the soil water content, promote the growth of crops and increase the yield; and the raw materials are wide in source, the process flow is simple, the use is convenient, the energy is saved, the environment is protected, the industrialization, the popularization and the application are easy, and the market prospect is good.
Description
Technical Field
The invention relates to the technical field of soil environment protection, in particular to a bentonite liquid mulching film and a preparation method and application thereof.
Background
The mulching film is used for ground covering to improve the soil temperature, keep the soil moisture, maintain the soil structure, prevent pests from attacking crops and diseases caused by certain microorganisms and the like, and promote the growth of plants, is popularized and applied in 31 provinces and municipalities in China, is used for 40 crops such as grains, cotton, oil, vegetables, melons and fruits, tobacco, sugar, medicines, hemp, tea, forests and the like, generally increases the yield of the crops by 30-50 percent and increases the value by 40-60 percent, and is deeply popular with vast farmers. The traditional mulching film is generally made of polyethylene, polyvinyl chloride or EVA and the like serving as main raw materials through melt blow molding, and is usually in a transparent solid state. The plastic mulching cultivation technology can greatly improve the yield and quality of crops, and plays an extremely important role in crop production. However, with the long-term application of plastic mulching films, serious white pollution has been caused. The method is mainly characterized in that polyethylene residual films which are difficult to degrade are increasingly gathered on the surface of a soil plough layer, soil cultivation is directly influenced, operation of moisture, nutrients and air in the soil is hindered, the root system of crops is hindered from being pricked down, water and fertilizer are prevented from being absorbed, and growth and yield of the crops are influenced. Because the mulching film is generally used once, the plastic is difficult to degrade in nature, and plastic films scattered in the field accumulate all the year round to form white pollution, destroy the soil structure and influence the growth of crops. Therefore, people pay attention to the development of environment-friendly pollution-free mulching films.
With the continuous development of the mulching technology, a novel agricultural product, namely biodegradable liquid mulching film, is produced at the same time, the biodegradable liquid mulching film has excellent wettability, can completely cover all the soil surfaces, has the functions of water retention and humidification, can effectively prevent the soil moisture from evaporating, has the moisture evaporation inhibition rate of between 20 and 50 percent, and can keep the soil moisture for a long time by matching with a water absorbing material. When the seedlings of the plants grow out, the film can be automatically burst, the film can be automatically degraded to become humic acid fertilizer, and the humic acid fertilizer has the effect of improving the granular structure of the soil after being turned and pressed into the soil. The biodegradable liquid mulching film has the advantages of warming, soil moisture conservation and good ventilation and water permeability, can be automatically degraded into humic acid within 2-3 months after being sprayed for 40 days, improves the growth environment of crops, and solves the problem of white pollution, so the biodegradable liquid mulching film is regarded as a substitute of traditional mulching films such as PE films and the like to be popularized and used all over the country.
In order to improve the performance and quality of liquid mulching films, related research work is continuously carried out, Chinese patents such as CN201710748236.7, CN201711295238.1, CN201110440063.5 and CN201711295238.1 successively disclose a liquid mulching film, the liquid mulching film can be uniformly sprayed on the ground surface to form the mulching film when in use, the liquid mulching film can replace plastic mulching films commonly used in agriculture and horticulture in many fields, and can effectively solve the problem that the plastic mulching film pollutes soil, but the liquid mulching film has the defect of inconvenient storage and transportation, meanwhile, a film-forming agent in raw material components enables the viscosity of the liquid mulching film to be larger, the flow channel of a spraying device is easy to block, the use of strong alkali has the possibility of causing a new environmental pollution problem, and the problems of complex preparation process, high cost, poor stability and the like caused by adopting.
Disclosure of Invention
Aiming at the problems of complex preparation process, high cost, poor stability and the like of the existing liquid mulching film which takes bentonite as a raw material. The invention aims at providing a bentonite liquid mulching film and a preparation method and application thereof, wherein the bentonite liquid mulching film comprises 300 parts of supernatant of bentonite dispersion liquid, 2-8 parts of montmorillonite, 11-37 parts of polyglutamic acid, 2-7 parts of acetic acid, 4-12 parts of polyvinyl alcohol, 5-10 parts of gum arabic and 300 parts of water, the montmorillonite, the polyglutamic acid (gamma-PGA) with strong hydrophilicity and the acetic acid are added into the bentonite dispersion supernatant, the bentonite adsorbs and complexes active ingredients to form a stable solution system, the liquid mulching film has the effects of water retention, soil moisture retention, temperature increase and cold protection, and is applied to cotton planting, and the result shows that the bentonite liquid mulching film provided by the invention can obviously improve the soil water content, promote the crop growth and increase the yield; and the raw materials are wide in source, the process flow is simple, the use is convenient, the energy is saved, the environment is protected, the industrialization, the popularization and the application are easy, and the market prospect is good.
The invention provides a bentonite liquid mulching film which comprises, by weight, 300 parts of bentonite dispersion liquid supernatant 100-containing materials, 2-8 parts of montmorillonite, 11-37 parts of polyglutamic acid, 2-7 parts of acetic acid, 4-12 parts of polyvinyl alcohol, 5-10 parts of gum arabic and 300 parts of water 100-containing materials.
Further, the bentonite liquid mulching film comprises, by weight, 300 parts of supernatant of bentonite dispersion, 2 parts of montmorillonite, 37 parts of polyglutamic acid, 7 parts of acetic acid, 12 parts of polyvinyl alcohol, 5 parts of gum arabic and 300 parts of water.
Meanwhile, the invention provides a preparation method of the bentonite liquid mulching film, which comprises the following steps:
(1) taking the supernatant of the bentonite dispersion liquid with the concentration of 1 percent, separating at 7000rad/min by using a high-speed centrifuge, and taking the jelly-like clay for later use.
(2) Adding montmorillonite into the jelly-like clay, stirring to completely mix montmorillonite to obtain clay montmorillonite liquid.
(3) Adding polyglutamic acid and acetic acid into the clay montmorillonite liquid obtained in the step (2), stirring at the constant temperature of 40-60 ℃ for 6-12h to completely dissolve the polyglutamic acid, and slowly cooling to room temperature for later use.
(4) And (3) adding polyvinyl alcohol and gum arabic into water at the temperature of 80-90 ℃, completely dissolving, cooling to room temperature, and uniformly mixing with the mixed liquid prepared in the step (3) to obtain the bentonite liquid mulching film.
In the preparation method of the bentonite liquid mulching film, the speed of the centrifuge in the step (2) is 6000 rad/min.
In the preparation method of the bentonite liquid mulching film, the dissolution temperature of the polyglutamic acid is 50 ℃, and the stirring time is 10 hours.
Further, the invention provides application of a bentonite liquid mulching film in cotton planting, wherein in the middle of 4 months, the liquid mulching film and water are mixed according to the volume ratio of 1: 3 diluting, uniformly spraying the mixture on the ground surface by using a conventional agricultural sprayer, wherein the dosage is 1600kg/hm2。
By implementing the technical content of the invention through the technical scheme, the following beneficial effects are obtained:
(1) the multifunctional liquid mulching film provided by the invention provides an innovative use mode and a product for the annual bentonite, breaks through the difficult problem of difficult degradation of the plastic mulching film applied to the field, and enables the bentonite product to be really applied to agricultural production.
(2) The bentonite liquid mulching film provided by the invention has a neutral or alkalescent pH value, solves the problem of environmental pollution caused by the introduction of strong base into the existing liquid mulching film, further shortens the degradation time, can be used as a soil conditioner to improve the soil nutrition, and does not provide necessary nutrition guarantee for the growth of crops.
(3) The bentonite liquid mulching film provided by the invention has remarkable heat preservation and water retention effects, has the activities of improving soil, promoting crop growth and increasing yield by using bentonite, and is applied to cotton planting, the yield of cotton per mu is improved by 14-16% compared with that of the existing liquid mulching film, and the yield of cotton per mu is improved by 6-8% compared with that of the existing liquid mulching film; and the raw materials are wide in source, the process flow is simple, the use is convenient, the energy is saved, the environment is protected, the industrialization, the popularization and the application are easy, and the market prospect is good.
Detailed Description
The present invention will be described by way of examples, but the present invention is not limited to the examples.
The raw materials, reagents and apparatuses selected from bentonite, montmorillonite, polyglutamic acid, acetic acid, polyvinyl alcohol and gum arabic are well known in the art, but are not limited to practice of the present invention, and other reagents and apparatuses well known in the art can be applied to practice of the following embodiments of the present invention.
Measurement indexes are as follows:
(1) and (3) jointly measuring the weight and water content of the soil by adopting a soil-taking drying method and a neutron instrument. The hole is reset after soil sampling, influence is reduced, soil sampling is mainly carried out in the middle and later stages, sampling is carried out once every 7d, and the weight and water content of soil layers of 10-20 cm and 20-30 cm are measured. The change in 42d after the covering treatment is mainly observed so as to grasp the influence of the change of the liquid mulching film covering along with the time on the soil moisture content.
(2) The earth temperature is measured by recording the earth temperature of 15-25cm at 10:00, 16:00 and 20:00 days by using a curved tube earth thermometer, and the average value is taken.
Example 1: bentonite liquid mulching film
The liquid bentonite mulching film comprises, by weight, 300 parts of bentonite dispersion liquid supernatant fluid 100-.
Example 2: bentonite liquid mulching film
This example provides a bentonite liquid mulching film including 300kg of supernatant of a bentonite dispersion, 2kg of montmorillonite, 37kg of polyglutamic acid, 7kg of acetic acid, 12kg of polyvinyl alcohol, 5kg of gum arabic, and 300kg of water, in addition to example 1.
Example 3: bentonite liquid mulching film
This example provides a bentonite liquid mulching film including 100kg of a supernatant of a bentonite dispersion, 2kg of montmorillonite, 11kg of polyglutamic acid, 2kg of acetic acid, 4kg of polyvinyl alcohol, 5kg of gum arabic, and 100kg of water, in addition to example 1.
Example 4: bentonite liquid mulching film
This example provides a bentonite liquid mulching film including 300kg of supernatant of a bentonite dispersion, 8kg of montmorillonite, 37kg of polyglutamic acid, 7kg of acetic acid, 12kg of polyvinyl alcohol, 10kg of gum arabic, and 300kg of water, in addition to example 1.
Example 5: bentonite liquid mulching film
This example provides a bentonite liquid mulching film including 200kg of a supernatant of a bentonite dispersion, 6kg of montmorillonite, 25kg of polyglutamic acid, 5kg of acetic acid, 8kg of polyvinyl alcohol, 8kg of gum arabic, and 250kg of water, in addition to example 1.
Example 6: preparation of bentonite liquid mulching film
A preparation method of a bentonite liquid mulching film specifically comprises the following steps:
(1) taking the supernatant of the bentonite dispersion liquid with the concentration of 1 percent, separating at 7000rad/min by using a high-speed centrifuge, and taking the jelly-like clay for later use.
(2) Adding montmorillonite into the jelly-like clay, stirring to completely mix montmorillonite to obtain clay montmorillonite liquid.
(3) Adding polyglutamic acid and acetic acid into the clay montmorillonite liquid obtained in the step (2), stirring at the constant temperature of 40-60 ℃ for 6-12h to completely dissolve the polyglutamic acid, and slowly cooling to room temperature for later use.
(4) And (3) adding polyvinyl alcohol and gum arabic into water at the temperature of 80-90 ℃, completely dissolving, cooling to room temperature, and uniformly mixing with the mixed liquid prepared in the step (3) to obtain the bentonite liquid mulching film.
Example 7: preparation of bentonite liquid mulching film
This example provides a method for preparing a bentonite liquid mulch film based on the formulation of the bentonite liquid mulch film in examples 1-5 and the method for preparing the bentonite liquid mulch film in example 6, wherein the speed of the bentonite dispersion centrifuge is 6000rad/min, the polyglutamic acid dissolution temperature is 50 ℃, and the stirring time is 10 hours.
Example 8: preparation of bentonite liquid mulching film
This example provides a method for preparing a liquid bentonite mulch film, based on the formulation of the liquid bentonite mulch film in examples 1-5 and the method for preparing the liquid bentonite mulch film in example 6, wherein the speed of the bentonite dispersion centrifuge is 5000rad/min, the polyglutamic acid dissolution temperature is 40 ℃, and the stirring time is 6 hours.
Example 9: preparation of bentonite liquid mulching film
This example provides a method for preparing a liquid mulch film of bentonite, based on the formulation of the liquid mulch film of bentonite in examples 1-5 and the method for preparing the liquid mulch film of bentonite in example 6, wherein the speed of the bentonite dispersion centrifuge is 7000rad/min, the polyglutamic acid dissolution temperature is 60 ℃, and the stirring time is 12 hours.
Example 10: preparation of bentonite liquid mulching film
This example provides a method for preparing a bentonite liquid mulch film based on the formulation of the bentonite liquid mulch film in examples 1-5 and the method for preparing the bentonite liquid mulch film in example 6, wherein the speed of the bentonite dispersion centrifuge is 6000rad/min, the polyglutamic acid dissolution temperature is 55 ℃, and the stirring time is 8 hours.
Example 11: the performance of the bentonite liquid mulching film is compared with that of the existing liquid mulching film
(1) Design of experiments
In this embodiment, on the basis of examples 1 to 10, the performances of the bentonite liquid mulching film provided by the present invention and the liquid mulching films prepared by the technical schemes provided by chinese patents CN201710748236.7, CN201711295238.1, and CN201110440063.5 and the commercially available liquid mulching films are examined and compared. See table 1 for a specific test protocol.
Table 1: design of test protocol
| Grouping | Design of experiments |
| Test group A | CN201710748236.7 discloses a technical scheme of liquid mulching film |
| Test group B | CN201711295238.1 discloses a technical scheme of liquid mulching film |
| Test group C | CN201110440063.5 discloses a technical scheme of liquid mulching film |
| Test group D | Commercial liquid mulching film |
| Test group E | Liquid mulching film prepared in inventive example 2+ example 7 |
(2) Analysis of test results
The main technical indexes of the obtained liquid mulching film are detected according to the test scheme, and the specific results are shown in table 2.
Table 2: the technical indexes of the liquid mulching film are compared with those of the existing liquid mulching film
As can be seen from the data in table 2, compared with the liquid mulching films prepared by the technical schemes provided in chinese patents CN201710748236.7, CN201711295238.1, and CN201110440063.5 and the commercially available liquid mulching films in terms of technical indexes, the liquid mulching films prepared by the present invention have significantly improved film forming rate, viscosity, degradation time, and pH value.
Example 12: compared with the prior liquid mulching film, the bentonite liquid mulching film of the invention has application
In this embodiment, on the basis of examples 1 to 10, the effects of the bentonite liquid mulching film provided by the present invention, the liquid mulching film prepared by the technical scheme provided by chinese patents CN201710748236.7, CN201711295238.1, and CN201110440063.5, and the commercially available liquid mulching film in the actual application process are compared, the effects of soil heat preservation, moisture retention, and plant growth promotion and yield increase are mainly considered, 3 parallel tests are performed in each group, and the other conditions are the same, and the specific results are shown in tables 3 to 4; in the middle ten (4) month, the contrast test is applied according to the best mode in the technical scheme, and the bentonite liquid mulching film provided by the invention is mixed with water according to the volume ratio of 1: 3 diluting, uniformly spraying the mixture on the ground surface by using a conventional agricultural sprayer, wherein the dosage is 1600kg/hm2. The number of the sowed strains was 270000 strains/ha, and the effective number of the strains was 217500 strains/ha. The yield was counted according to the formula yield of single plant boll number × single boll weight × plant number/ha × 0.9(0.9 correction coefficient), and the specific results are shown in table 5.
Table 3: the influence of the liquid mulching film on the temperature of the soil at the depth of 20cm underground of the cotton field
Note: p < 0.05, P < 0.01 compared to the blank group.
Table 4: the influence of the liquid mulching film on the soil humidity in the depth of 20cm underground of the cotton field
Note: p < 0.05, P < 0.01 compared to the blank group.
Table 5: the influence of the liquid mulching film on the agronomic characters and the yield of cotton
Note: p < 0.05, P < 0.01 compared to the blank group.
The data in tables 3-5 show that compared with the liquid mulching films prepared by the technical schemes provided by the Chinese patents CN201710748236.7, CN201711295238.1 and CN201110440063.5 and the commercially available liquid mulching films, the liquid mulching films prepared by the invention have the advantages that the effects in the practical application process are obviously improved in the aspects of soil temperature and humidity compared with other groups, and the soil temperature and humidity are both remarkably (P is less than 0.01) or remarkably (P is less than 0.05), so that the liquid mulching films prepared by the invention have good heat preservation effect, wherein the heat preservation performance of the liquid mulching film III is optimal; with the lapse of measurement time, the heat preservation and moisture retention effects of the mulching films gradually decline, and even after 35d, the heat preservation and moisture retention effects of the liquid mulching film I are no longer significant, which may be caused by the initial degradation of the mulching films. The statistics of the cotton yield is further carried out, and the results show that the liquid mulching film prepared by the invention has a remarkable promoting effect on the growth and development of cotton, the yield is greatly increased by 14-16% compared with that of the existing liquid mulching film, the yield is increased by 6-8% compared with that of the existing liquid mulching film, and meanwhile, the raw material and management cost of the liquid mulching film are checked, the cost of the liquid mulching film is reduced by 3-5% per mu.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made while remaining within the scope of the present invention.
Claims (5)
1. The bentonite liquid mulching film is characterized by comprising, by weight, 300 parts of bentonite dispersion liquid supernatant 100-.
2. The bentonite liquid mulching film according to claim 1, wherein the liquid mulching film comprises 300 parts by weight of supernatant of bentonite dispersion, 2 parts by weight of montmorillonite, 37 parts by weight of polyglutamic acid, 7 parts by weight of acetic acid, 12 parts by weight of polyvinyl alcohol, 5 parts by weight of gum arabic, and 300 parts by weight of water.
3. The preparation method of the bentonite liquid mulching film is characterized by comprising the following steps:
(1) taking the supernatant of the bentonite dispersion liquid with the concentration of 1 percent, separating at 7000rad/min by using a high-speed centrifuge, and taking the jelly-like clay for later use;
(2) adding montmorillonite into the jelly-like clay, and stirring to completely and uniformly mix the montmorillonite to obtain clay montmorillonite liquid;
(3) adding polyglutamic acid and acetic acid into the clay montmorillonite liquid obtained in the step (2), stirring at the constant temperature of 40-60 ℃ for 6-12h to completely dissolve the polyglutamic acid, and slowly cooling to room temperature for later use;
(4) and (3) adding polyvinyl alcohol and gum arabic into water at the temperature of 80-90 ℃, completely dissolving, cooling to room temperature, and uniformly mixing with the mixed liquid prepared in the step (3) to obtain the bentonite liquid mulching film.
4. The method for preparing a liquid bentonite mulch film according to claim 3, wherein the centrifuge speed in step (2) is 6000rad/min, the polyglutamic acid dissolution temperature in step (3) is 50 ℃, and the stirring time is 10 h.
5. An application of a bentonite liquid mulching film in cotton planting.
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| CN103265385A (en) * | 2013-04-27 | 2013-08-28 | 刘好宝 | Liquid film prepared from crop straw fermentation liquid and application method thereof |
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| US20190116795A1 (en) * | 2016-04-07 | 2019-04-25 | Zhejiang Hisun Pharmaceutical Co., Ltd. | Use of tenvermectin in control of harmful insects in agricultural and forest crops |
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2020
- 2020-11-27 CN CN202011363902.3A patent/CN112500866B/en active Active
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| US3931068A (en) * | 1972-07-28 | 1976-01-06 | Union Carbide Corporation | Blends of biodegradable thermoplastic oxyalkanoyl polymer, a naturally occurring biodegradable product, filler and plastic additive |
| CN103265385A (en) * | 2013-04-27 | 2013-08-28 | 刘好宝 | Liquid film prepared from crop straw fermentation liquid and application method thereof |
| US20190116795A1 (en) * | 2016-04-07 | 2019-04-25 | Zhejiang Hisun Pharmaceutical Co., Ltd. | Use of tenvermectin in control of harmful insects in agricultural and forest crops |
| CN109438943A (en) * | 2018-11-15 | 2019-03-08 | 蚌埠星烁新材料科技有限公司 | A kind of preparation method of environmental protection agricultural mulching |
| CN111269517A (en) * | 2018-12-05 | 2020-06-12 | 杭州沃福生物科技有限公司 | Water-retaining liquid mulching film and preparation method and application thereof |
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| Title |
|---|
| 朱廷彬: "《润滑脂技术大全》", 30 April 2005, 中国石化出版社 * |
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