WO2017088255A1 - 一种蓝靛草提取物的制备方法及应用 - Google Patents

一种蓝靛草提取物的制备方法及应用 Download PDF

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WO2017088255A1
WO2017088255A1 PCT/CN2015/099496 CN2015099496W WO2017088255A1 WO 2017088255 A1 WO2017088255 A1 WO 2017088255A1 CN 2015099496 W CN2015099496 W CN 2015099496W WO 2017088255 A1 WO2017088255 A1 WO 2017088255A1
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extract
sassafras
preparing
blue
application
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周琪
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常州市金坛翰广科技有限公司
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/18—Magnoliophyta (angiosperms)
    • A61K36/185—Magnoliopsida (dicotyledons)
    • A61K36/19—Acanthaceae (Acanthus family)
    • A61K36/195—Strobilanthes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/18—Magnoliophyta (angiosperms)
    • A61K36/185—Magnoliopsida (dicotyledons)
    • A61K36/35—Caprifoliaceae (Honeysuckle family)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/18—Magnoliophyta (angiosperms)
    • A61K36/185—Magnoliopsida (dicotyledons)
    • A61K36/70—Polygonaceae (Buckwheat family), e.g. spineflower or dock
    • A61K36/704—Polygonum, e.g. knotweed
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B61/00—Dyes of natural origin prepared from natural sources, e.g. vegetable sources
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/34—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using natural dyestuffs
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/60—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing polyethers
    • D06P1/613—Polyethers without nitrogen

Definitions

  • the invention belongs to the field of natural plant extract research, and particularly relates to a preparation method of blue yarrow extract and application thereof.
  • Blue sedge is a kind of grass plant. Its cultivation and production has a long history among the Yao people.
  • the main use of the blue sedge extract is dyed cloth and medicinal.
  • the blue sedge extract is not only used by itself, but also sold as a product at the market. It is a special dye for ethnic minorities.
  • the seeds of blue yarrow are small and shaped like cedar. They are harvested after the Qingming in March. They are buried in the ground in May and planted in July and August. Most of them are transplanted in the land of the hoe and the ditch, and it is suitable for the soil with wet soil.
  • the blue dragonfly grows two to three feet high, and the school leaves are green. The taste is aromatic and unique. It is soaked in July and August. Blue sedge has great development potential.
  • Digital inkjet printing uses a scanner, digital camera and other input means to input the pattern into the computer in digital form. After processing by the image software, the digital inkjet printing machine controlled by the computer directly sprays the printing ink onto various fibers. On the fabric, various patterns input are printed to obtain various printed fabrics.
  • Digital printing equipment is developing rapidly. As an indispensable part of digital printing, the printing inks that determine the printing effect must also develop. Printing ink, one of the main consumables for digital inkjet printing, is also a key factor in determining the success of inkjet printing technology.
  • the prior art digital inkjet printing coatings, especially non-aqueous coatings, generally use organic solvents and synthetic dyes, and the products are highly toxic and have serious environmental pollution.
  • the technical problem to be solved by the present invention is to provide a method for preparing natural plant yarrow extract and its application, including the application of the yarrow extract in digital printing paint.
  • the technical solution adopted by the present invention is:
  • the pH of the aqueous ethanol solution is adjusted by sodium bicarbonate or sodium carbonate, the mass ratio of the yarrow grass pulverized material to the aqueous ethanol solution is 1:20-25;
  • step (2) in the stirring state, the extraction system obtained in step (1) is heated, reflux extraction for 2h;
  • the invention also provides a process for preparing an inkjet printing paint by using the above blue yarrow extract as a dye:
  • the rest is a mixed solvent of glycerin and water, wherein the volume ratio of glycerin to water is 1:1.
  • the sassafras extract, the viscosity modifier, the surfactant, the pH adjuster, and the aqueous polyurethane binder are added to a mixed solvent of glycerin and water, and stirred uniformly at normal temperature, and the obtained mixture is sequentially passed through a pore diameter of 0.45 ⁇ m and 0.22. ⁇ m membrane filtration to obtain the final inkjet printing coating,
  • the viscosity modifier is polyvinylpyrrolidone or polyethylene glycol 200; the surfactant is BYK-302 or BYK-307; the pH adjuster is sodium carbonate, sodium hydrogencarbonate, citric acid or hydrochloric acid.
  • natural plant yarrow extract is used as a dye instead of synthetic dye, which is green and environmentally friendly; matching a mixture of glycerin and water as a solvent, and being able to dissolve the extract of yarrow, compared with other organic solvents It is less toxic and does not pollute the environment.
  • the invention also provides the application of the above-mentioned blue yarrow extract in the prevention and treatment of allergic dermatitis and acne, and the blue yarrow extract and the common components of the cosmetics are evenly mixed, and coated on the surface of allergic skin and acne, which can be smoothly
  • the ground is absorbed by the human body and plays a very good preventive role, avoiding the side effects of synthetic drugs on human skin.
  • the present invention also provides an application of the above-mentioned blue yarrow extract in controlling soil-borne diseases, and the blue yarrow extract prepared in the present invention is dissolved in glycerin to obtain a solution of the extract, and the solution is sprayed on the plant.
  • the part of the above-ground tree stem because the blue yarrow extract itself is a natural substance, has good compatibility with other plants, is easily absorbed, and has a control effect.
  • the pH of the aqueous ethanol solution is adjusted by sodium bicarbonate, and the mass ratio of the yarrow grass pulverized material to the aqueous ethanol solution is 1:20;
  • step (2) in the stirring state, the extraction system obtained in step (1) is heated, reflux extraction for 2h;
  • the pH value of the aqueous ethanol solution is adjusted by sodium carbonate, and the mass ratio of the yarrow grass pulverized material to the aqueous ethanol solution is 1:25;
  • step (2) in the stirring state, the extraction system obtained in step (1) is heated, reflux extraction for 2h;
  • the inkjet printing coating was prepared on the basis of the blue yarrow extract prepared in Example 1:
  • the rest is a mixed solvent of glycerin and water, in which the volume ratio of glycerin to water is 1:1.
  • the inkjet printing coating was prepared on the basis of the blue yarrow extract prepared in Example 2:
  • the rest is a mixed solvent of glycerin and water, in which the volume ratio of glycerin to water is 1:1.
  • the sassafras extract, the viscosity modifier, the surfactant, the pH adjuster, and the aqueous polyurethane binder are added to a mixed solvent of glycerin and water, and stirred uniformly at normal temperature, and the obtained mixture is sequentially passed through a pore diameter of 0.45 ⁇ m and 0.22.
  • the membrane of ⁇ m was filtered to obtain a final inkjet printing coating.
  • a coating paste for controlling allergic dermatitis and acne is prepared, and the specific process is: 8% by weight of yarrow extract, 15% of active pearl powder, and 8.2 of titanium dioxide. %, 7% ethyl methoxycinnamate, 7% methyl cellulose, 5.8% xanthan gum, 5.5% tricaprylate citrate, and the balance being glycerol.
  • the sassafras extract obtained in Example 2 was dissolved in glycerin to prepare a solution of sassafras extract having a solute mass fraction of 10%, and stored in the dark.
  • a cotton field with consistent soil traits, uniform fertility, and a certain cotton wilt disease trend was selected, and the cotton trees in the cotton field had grown to have a certain length of tree bar structure.
  • the total number of cotton trees in the above cotton field was counted, and 1/3 of the cotton trees were randomly selected, and the solution of the arborvitae extract of the 1/3 number of cotton trees was used. Spraying, spraying a uniform amount, recorded as "1";

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  • Health & Medical Sciences (AREA)
  • Natural Medicines & Medicinal Plants (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Medical Informatics (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Alternative & Traditional Medicine (AREA)
  • Biotechnology (AREA)
  • Botany (AREA)
  • Textile Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Microbiology (AREA)
  • Mycology (AREA)
  • Veterinary Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Organic Chemistry (AREA)
  • Cosmetics (AREA)
  • Medicines Containing Plant Substances (AREA)

Abstract

本发明属于天然植物提取物研究领域，特别涉及一种蓝靛草提取物的制备方法及其应用。制备方法为，将蓝靛草洗净、晾干，粉碎，再将蓝靛草粉碎物加入到乙醇水溶液中，升温，回流提取；回流提取后的体系趁热过滤，将滤液冷却，冷却过程中有固体物质析出，即蓝靛草提取物。本发明制备的蓝靛草提取物被应用于防治过敏性皮炎、痤疮方面，以及防治土传病害方面具有良好的功效。

Description

一种蓝靛草提取物的制备方法及应用 技术领域
本发明属于天然植物提取物研究领域，特别涉及一种蓝靛草提取物的制备方法及其应用。
背景技术
蓝靛草是一种草术植物，它的栽培及制作在瑶族人民中具有悠久的历史，蓝靛草提取物的主要用途是染布，也可药用。在瑶家，蓝靛草提取物不仅自己使用，还作为产品拿到集市上销售，是少数民族特需的染料。蓝靛草种子细小，形似杉术种，三月清明以后采种，五月整地埋墒搭棚育秧，七至八月移栽。大多移栽在芋头地及箐沟边，以土质潮湿的地方为宜。蓝靛株高二至三尺，校叶杆萃绿，其味芳香，独有特色，七至八月采割浸泡。蓝靛草具有很大的开发潜能。
数码喷墨印花，是用扫描仪、数字照相机等输入手段，将图案以数字形式输入计算机，经过图像软件处理后，再通过计算机控制的数码喷墨印花机，直接将印花墨水喷射到各种纤维织物上，印制出所输入的各种图案，从而得到各种印花织物。
数码印花设备飞速发展，作为数码印花中不可缺少的，决定印花效果的关键因素印花墨水也要随之发展。作为数码喷墨印花主要耗材之一的印花墨水，也是决定喷墨印花技术成功与否的关键性因素。现有技术中的数码喷墨印花用涂料，特别是非水性涂料，一般使用有机溶剂和合成染料，产品毒性大、环境污染严重。
发明内容
本发明所要解决的技术问题在于：提供一种以天然的植物蓝靛草提取物的制备方法及其应用，其中包括该蓝靛草提取物在数码印花涂料方面的应用。
为解决这一技术问题，本发明采用的技术方案为：
蓝靛草提取物的制备方法：
(1)将蓝靛草洗净、晾干，粉碎至20—40目，得到蓝靛草粉碎物，再将所得的蓝靛草粉碎物加入到pH值7—9、体积百分比浓度为75-85％乙醇水溶液中，得到提取体系，
其中，乙醇水溶液的pH值是通过碳酸氢钠或碳酸钠来调节的，蓝靛草粉碎物与乙醇水溶液的质量比为1∶20—25；
(2)在搅拌状态下，将步骤(1)中得到的提取体系升温，回流提取2h；
(3)将经过步骤(2)回流提取后的体系趁热于85—90℃的温度下过滤，将所得的滤液冷却，冷却过程中有固体物质析出，所述滤液冷却至1—2℃后，过滤收集析出的固体物质，65—70℃烘干，得到蓝靛草提取物，避光保存，
由于蓝靛草提取物在水和乙醇中的溶解度很小，在溶液冷却过程中，提取物会自然析出得到，避免了使用喷雾干燥等复杂的提取物回收手段。
本发明还提供了一种以上述蓝靛草提取物作为染料制备喷墨印花涂料的工艺：
按重量百分比
Figure PCTCN2015099496-appb-000001
其余为甘油和水的混合溶剂，其中甘油和水的体积比为1：1，
将蓝靛草提取物、粘度调节剂、表面活性剂、pH调节剂、水性聚氨酯粘合剂加入到甘油和水的混合溶剂中，常温下搅拌均匀，将所得的混合物依次过孔径为0.45μm和0.22μm的膜过滤，得到最终喷墨印花涂料，
其中，粘度调节剂为聚乙烯吡咯烷酮或聚乙二醇200；表面活性剂为BYK–302或BYK–307；pH调节剂为碳酸钠、碳酸氢钠、柠檬酸或盐酸，
上述喷墨涂料中，采用天然植物蓝靛草提取物作为染料，代替了合成染料，绿色环保；匹配上甘油和水的混合物作为溶剂，在能够溶解蓝靛草提取物的基础上，与其他有机溶剂相比毒性小、不会污染环境。
本发明还提供了一种以上述蓝靛草提取物在防治过敏性皮炎、痤疮方面的应用，将蓝靛草提取物与化妆品常用组分混合均匀后，涂覆于过敏性皮肤和痤疮表面，能够顺利地被人体吸收，起到很好的防治作用，避免了合成药物对人体皮肤的副作用。
本发明还提供了一种以上述蓝靛草提取物在防治土传病害方面的应用，将本发明中制备的蓝靛草提取物溶解于甘油中得到提取物的溶液，再将该溶液喷施于植物的地上部树杆部分，由于蓝靛草提取物本身属于天然物质，与其他植物有良好的相容性，容易被吸收，起到防治的效果。
具体实施方式
实施例1
(1)将蓝靛草洗净、晾干，粉碎至25目，得到蓝靛草粉碎物，再将所得的蓝靛草粉碎物加入到pH值为8、体积百分比浓度为75％(V乙醇：V水)的乙醇水溶液中，得到提取体系，
其中，乙醇水溶液的pH值是通过碳酸氢钠来调节的，蓝靛草粉碎物与乙醇水溶液的质量比为1∶20；
(2)在搅拌状态下，将步骤(1)中得到的提取体系升温，回流提取2h；
(3)将经过步骤(2)回流提取后的体系趁热于85—90℃的温度下过滤，将所得的滤液冷却，冷却过程中有固体物质析出，所述滤液冷却至2℃后，过滤收集析出的固体物质，65℃烘干，得到蓝靛草提取物，避光保存。
实施例2
(1)将蓝靛草洗净、晾干，粉碎至35目，得到蓝靛草粉碎物，再将所得的蓝靛草粉碎物加入到pH值7、体积百分比浓度为85％(V乙醇：V水)乙醇水溶液中，得到提取体系，
其中，乙醇水溶液的pH值是通过碳酸钠来调节的，蓝靛草粉碎物与乙醇水溶液的质量比为1∶25；
(2)在搅拌状态下，将步骤(1)中得到的提取体系升温，回流提取2h；
(3)将经过步骤(2)回流提取后的体系趁热于85—90℃的温度下过滤，将所得的滤液冷却，冷却过程中有固体物质析出，所述滤液冷却至2℃后，过滤收集析出的固体物质，70℃烘干，得到蓝靛草提取物，避光保存。
实施例3
采用实施例1制备得到的蓝靛草提取物为基础，制备喷墨印花涂料：
按重量百分比
Figure PCTCN2015099496-appb-000002
其余为甘油和水的混合溶剂，其中甘油和水的体积比为1：1
将蓝靛草提取物、粘度调节剂、表面活性剂、pH调节剂、水性聚氨酯粘合剂加入到甘油 和水的混合溶剂中，常温下搅拌均匀，将所得的混合物依次过孔径为0.45μm和0.22μm的膜过滤，得到最终喷墨印花涂料。
实施例4
采用实施例2制备得到的蓝靛草提取物为基础，制备喷墨印花涂料：
按重量百分比
Figure PCTCN2015099496-appb-000003
其余为甘油和水的混合溶剂，其中甘油和水的体积比为1：1
将蓝靛草提取物、粘度调节剂、表面活性剂、pH调节剂、水性聚氨酯粘合剂加入到甘油和水的混合溶剂中，常温下搅拌均匀，将所得的混合物依次过孔径为0.45μm和0.22μm的膜过滤，得到最终喷墨印花涂料。
实施例5
采用实施例1得到的蓝靛草提取物，制备用于防治过敏性皮炎、痤疮的涂覆膏，具体工艺为：按重量百分比蓝靛草提取物8％、纳米级活性珍珠粉15％、钛白粉8.2％、甲氧基肉桂酸乙基乙酯7％、甲基纤维素7％、黄原胶5.8％、辛酸癸酸三甘油酯5.5％，其余为甘油。
将以上各组分混合均匀，适量涂抹于中度过敏性皮肤上，一天早晚两次，按上述规律涂抹，两天后产生效果，5天后效果显著，8—10天时过敏性皮炎痊愈。
将以上各组分混合均匀，适量涂抹于中度过敏性皮肤上，一天早晚两次，按上述规律涂抹，1—2天后产生效果，7—8天时痤疮基本消除。
实施例6
采用实施例2得到的蓝靛草提取物，溶解于甘油中配成溶质质量分数为10％的蓝靛草提取物的溶液，避光保存。
选择1块土壤性状一致、肥力均匀中等，且具有一定棉花枯萎病发病趋势的棉田，且该棉田中的棉花树都已经生长具备了一定长度的树杆结构。
清点上述棉田中棉花树的总数量，并且随机抽取1/3数量的棉花树，采用本实施例中配制的蓝靛草提取物的溶液，对这1/3数量的棉花树的地上部树杆部分进行喷施，喷施量均匀，记作“1”；
作为空白对照，随机抽取另外1/3数量的棉花树，采用与之前喷施步骤中用量相等的纯的甘油进行均匀喷施，同样喷施于棉花树的地上部树杆部分，记作“2”；
对于该棉花田中剩余的1/3数量的棉花树，则不作任何处理，记作“3”。
观察以上1、2、3这3类棉花树的棉花枯萎病的发病情况，具体统计情况如表1所示：
表1
  调查株数 棉花枯萎病发病率
1 20 15％
2 20 75％
3 20 70％
(发病率(％)＝发病株数/调查总株数×100)

Claims (9)

  1. 一种蓝靛草提取物的制备方法，其特征在于：所述的制备方法为，
    (1)将蓝靛草洗净、晾干，粉碎至20—40目，得到蓝靛草粉碎物，再将所述的蓝靛草粉碎物加入到pH值7—9、体积百分比浓度为75-85％乙醇水溶液中，得到提取体系；
    (2)在搅拌状态下，将步骤(1)中得到的提取体系升温，回流提取2h；
    (3)将经过步骤(2)回流提取后的体系趁热于85—90℃的温度下过滤，将所得的滤液冷却，冷却过程中有固体物质析出，所述滤液冷却至1—2℃后，过滤收集析出的固体物质，65—70℃烘干，得到蓝靛草提取物。
  2. 如权利要求1所述的蓝靛草提取物的制备方法，其特征在于：步骤(1)中所述的乙醇水溶液的pH值是通过碳酸氢钠或碳酸钠来调节的。
  3. 如权利要求1所述的蓝靛草提取物的制备方法，其特征在于：步骤(1)中所述的蓝靛草粉碎物与乙醇水溶液的质量比为1∶20—25。
  4. 一种如权利要求1所述的蓝靛草提取物作为染料制备喷墨印花涂料的工艺，其特征在于：所述的工艺为，
    按重量百分比
    Figure PCTCN2015099496-appb-100001
    其余为甘油和水的混合溶剂，其中甘油和水的体积比为1：1，
    将蓝靛草提取物、粘度调节剂、表面活性剂、pH调节剂、水性聚氨酯粘合剂加入到甘油和水的混合溶剂中，常温下搅拌均匀，将所得的混合物依次过孔径为0.45μm和0.22μm的膜过滤，得到最终喷墨印花涂料。
  5. 如权利要求4所述的制备喷墨印花涂料的工艺，其特征在于：所述的粘度调节剂为聚乙烯吡咯烷酮或聚乙二醇200。
  6. 如权利要求4所述的制备喷墨印花涂料的工艺，其特征在于：所述的表面活性剂为BYK–302或BYK–307。
  7. 如权利要求4所述的制备喷墨印花涂料的工艺，其特征在于：所述的pH调节剂为碳酸钠、碳酸氢钠、柠檬酸或盐酸。
  8. 一种如权利要求1所述的蓝靛草提取物的应用，其特征在于：所述应用为，所述的蓝 靛草提取物在防治过敏性皮炎、痤疮方面的应用。
  9. 一种如权利要求1所述的蓝靛草提取物的应用，其特征在于：所述应用为，所述的蓝靛草提取物在防治土传病害方面的应用。
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