Plug seedling substrate and preparation method and application thereof

Abstract

The invention relates to the technical field of agriculture, and discloses a plug seedling substrate and a preparation method and application thereof. The plug seedling substrate comprises the following components: tea leaf residues, coco coir, an inorganic porous material and a functional liquid, wherein the functional liquid is prepared from the following components: irdoine, natamycin and polyglutamic acid. According to the plug seedling substrate provided by the invention, the air permeability is provided by the tea leaf residues, the water-retaining property is provided by the coco coir, and the inorganic porous material is used as a substrate framework, so that the requirements of seedlings on the water-retaining property, the air permeability and the root growth space of the substrate are met; meanwhile, the three seedling problems of water management, disease prevention and control and root development are solved; the non-renewable peat is replaced with the tea leaf residues obtained after tea polyphenol extraction and the coco coir, high-value utilization of agricultural waste is achieved, and compared with the non-renewable peat, the raw materials are low in cost and more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of agriculture, and in particular to a plug tray seedling cultivation matrix and a preparation method and application thereof. Background Art

[0002] Plug tray seedling technology uses various porous substrates as the seedling matrix and adopts a precision seeding and single-stage seedling production system. One seed is sown per hole, and one seed is established per room. This system offers multiple advantages, including labor and energy savings, low seed and seedling space costs, ease of standardized management, no seedling acclimatization period, and suitability for long-distance transportation. The seedling matrix is ​​the most critical component of plug tray seedling technology, and its quality directly determines the growth and development quality of the seedlings.

[0003] Cucurbits, a general term for vegetables from the Cucurbitaceae family, include pumpkin, winter melon, loofah, bitter melon, cucumber, and more. They are not only delicious but also rich in various nutrients. Compared to leafy vegetables, cucurbits generally have larger seeds, and their seedlings require a substrate with higher water retention and aeration.

[0004] As consumers' health awareness increases, the demand for low-sugar, sugar-free and functional tea beverages continues to increase. In recent years, the tea beverage market has shown a rapid development trend, accompanied by a large amount of difficult-to-handle tea dregs. How to turn tea dregs into treasure is an urgent problem that needs to be solved. CN 102860229 A discloses a tea tree plug tray seedling medium. Tea residue is fermented by microorganisms and then added to the tea tree plug tray seedling medium, which promotes the growth of tea seedlings and has a long-lasting fertilizer effect. CN 103704111 A discloses a seedling medium and a preparation method thereof. Tea residue is used as a new carrier for solid-state fermentation, and vermiculite, straw, and perlite are mixed to form a seedling medium for rapid seedling cultivation. The seedling medium has the advantages of uniform seedling emergence, short seedling age, strong growth, few diseases and insect pests, good substrate aeration, conducive to root development, no root damage during transplantation, high survival rate after planting, rapid seedling establishment, improved plant disease resistance, significantly reduced soil-borne diseases, enhanced stress resistance, less medication throughout the growth period, fertilizer conservation, and a high input-output ratio. CN 104086243A discloses a vegetable seedling medium and a preparation method thereof. The vegetable seedling medium is made by aerobic fermentation of a mixture of landscaping waste, tea residue, and pig manure. CN 104478550 A discloses a tea residue earthworm castings matrix suitable for tomato seedling cultivation and its preparation method, which utilizes tea residue combined with cow dung to breed earthworms, and then uses earthworm castings, perlite, vermiculite and peat as raw materials to prepare the tomato seedling cultivation matrix.

[0005] In summary, tea waste has been widely used in the preparation of seedling substrates. However, existing technologies primarily use fermented tea waste and mixed peat as the main raw materials. The fermentation process is complex and time-consuming, which affects the utilization and conversion of tea waste. Peat is also expensive and a non-renewable resource. Therefore, there is an urgent need to develop new tea waste utilization technologies, simplify the process of tea waste recycling, and prepare high-quality, more environmentally friendly plug tray substrates that are more suitable for melon and vegetable seedling cultivation. Summary of the Invention

[0006] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art. To this end, one of the objects of the present invention is to provide a seedling growing medium in a plug tray.

[0007] The second object of the present invention is to provide a method for preparing the plug tray seedling culture matrix.

[0008] The third object of the present invention is to provide the application of this plug tray seedling culture matrix.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] The first aspect of the present invention provides a plug tray seedling culture matrix, comprising the following components: tea residues, coconut husks, inorganic porous materials and functional liquid; wherein the functional liquid comprises the following components: icodine, natamycin and polyglutamic acid.

[0011] In some embodiments of the present invention, the physical and chemical indicators of the plug tray seedling medium include at least one of the following: a moisture content of 30%-50%; a total porosity of 60%-95%; a bulk density of 0.2-0.8 g / cm 3 ; Conductivity ≤ 1mS / cm; pH = 6.0-7.5.

[0012] In some preferred embodiments of the present invention, the physical and chemical indicators of the plug tray seedling medium include at least one of the following: a moisture content of 40%-50%; a total porosity of 70%-90%; a bulk density of 0.2-0.4 g / cm 3 ; Conductivity is 0.2-0.4mS / cm; pH=6.0-7.0.

[0013] In some embodiments of the present invention, the tea residue is the leftover material after tea polyphenols are extracted from tea raw materials; and the conductivity of the tea residue is ≤0.4 mS / cm.

[0014] In some preferred embodiments of the present invention, the tea residue is the leftover material after tea polyphenols are extracted from tea raw materials; and the conductivity of the tea residue is 0.1-0.3 mS / cm.

[0015] Specifically, the tea residue used in the present invention is the leftover material after tea polyphenols are extracted from tea raw materials. Soluble salts (such as potassium and sodium ions) may remain in the tea residue. If the conductivity is greater than 0.4mS / cm, direct use will cause dehydration of the seedling roots and scorch of the leaf edges, resulting in salt stress for the seedlings. It will also make the active ingredients such as natamycin and polyglutamic acid in the functional solution ineffective due to the high salt environment, thereby inhibiting the effect of the functional solution. Therefore, the present invention uses tea residue with a conductivity of ≤0.4mS / cm. The tea residue does not need to be fermented and treated to reduce salt and can be used directly. The tea residue fibers are fluffy and can provide good aeration for the plug tray seedling medium, ensuring the best growth effect of the seedlings.

[0016] In some embodiments of the present invention, the physical and chemical indicators of the tea residues further include at least one of the following: a moisture content of 25%-40%; and a particle size of ≤10 mm.

[0017] In some embodiments of the present invention, the electrical conductivity of the coconut husk is ≤0.7 mS / cm.

[0018] In some embodiments of the present invention, the coconut husk is a material obtained by swelling coconut bricks with water.

[0019] Specifically, coconut coir has strong water absorption, which can make up for the problem of insufficient water retention of tea residue, provide better water retention for the plug seedling medium, and form a matrix structure with "air-water balance"; coconut coir has good stability and is not easy to decompose, which can ensure that the matrix structure does not collapse during seedling cultivation; and coconut coir is a processed product of coconut shell fiber, which is a renewable resource and more environmentally friendly; the present invention uses coconut coir with an electrical conductivity of ≤0.7mS / cm, which can cooperate with tea residue to maintain a low-salt environment and ensure the growth effect of seedlings.

[0020] In some embodiments of the present invention, the physical and chemical indicators of the coconut bran further include at least one of the following: a moisture content of 30%-60%; and a particle size of 1-6 mm.

[0021] In some embodiments of the present invention, the particle size of the inorganic porous material is 2-5 mm.

[0022] In some preferred embodiments of the present invention, the particle size of the inorganic porous material is 2-4 mm.

[0023] In some embodiments of the present invention, the inorganic porous material is selected from at least one of vermiculite and perlite.

[0024] In some preferred embodiments of the present invention, the inorganic porous material is vermiculite.

[0025] Specifically, inorganic porous materials such as vermiculite and perlite are the "skeleton" of the matrix, which can provide physical support, prevent matrix compaction, and promote root extension. Their layered structure can absorb water and active ingredients in functional liquids, but does not participate in chemical reactions, and can maintain the matrix conductivity and pH stability; selecting inorganic porous materials with a particle size of 2-5mm can ensure uniform pores, avoiding being too fine to affect drainage or too coarse to reduce water holding capacity; compared with inorganic porous materials such as volcanic rock, zeolite, and biochar, vermiculite has the advantages of being light, breathable, water-retaining, and low cost.

[0026] In some embodiments of the present invention, the functional liquid comprises the following components, calculated by mass: 5-15 parts of ectoine, 1-5 parts of natamycin, 5-15 parts of polyglutamic acid, and 80-120 parts of water.

[0027] In some preferred embodiments of the present invention, the functional liquid comprises the following components, calculated by mass: 5-10 parts of ectoine, 1-3 parts of natamycin, 5-10 parts of polyglutamic acid, and 90-100 parts of water.

[0028] In some embodiments of the present invention, the functional fluid is prepared by a method comprising the following steps:

[0029] First, natamycin and polyglutamic acid are dissolved in water, and then icotin is slowly added and stirred to dissolve to obtain the functional liquid.

[0030] In some embodiments of the present invention, the dissolving temperature is 20-30°C.

[0031] In some embodiments of the present invention, the functional fluid is stored at 2-5°C.

[0032] Specifically, the active ingredient icotin in the functional liquid can fix water molecules through hydrogen bonds, making the moisture distribution of the matrix more even, enhancing water retention, and also improving the tolerance of seedlings to temperature fluctuations and salt stress; natamycin is a broad-spectrum antifungal agent that can inhibit soil-borne pathogens such as Fusarium and Rhizoctonia, and reduce the incidence of sudden wilting disease; polyglutamic acid can stimulate the roots to secrete auxin, increase root length and the number of lateral roots, and have the effect of promoting root growth and strengthening seedlings. It can also chelate nutrients to prevent the precipitation of metal ions in the functional liquid and improve utilization rate; by adding functional liquid, the three major seedling cultivation problems of water management, disease prevention and control, and root development can be solved at the same time.

[0033] In some embodiments of the present invention, the plug tray seedling medium comprises the following components, calculated by mass: 10-35 parts of tea residues, 10-35 parts of coconut bran, 10-35 parts of inorganic porous material, and 5-15 parts of functional liquid.

[0034] In some preferred embodiments of the present invention, the plug tray seedling medium comprises the following components, calculated by mass: 15-30 parts of tea residues, 15-30 parts of coconut bran, 15-30 parts of inorganic porous material, and 5-10 parts of functional liquid.

[0035] In some embodiments of the present invention, the plug tray seedling medium is stored in a dark condition.

[0036] The second aspect of the present invention provides a method for preparing the plug tray seedling substrate according to the first aspect of the present invention, comprising the following steps:

[0037] Firstly, tea residue, coconut husk and inorganic porous material are mixed, and then functional liquid is added and mixed evenly to obtain the plug tray seedling culture medium.

[0038] The third aspect of the present invention provides the use of the plug seedling medium described in the first aspect of the present invention in growing melon vegetable seedlings.

[0039] In some embodiments of the present invention, the melon vegetables include pumpkin, wax gourd, loofah, bitter gourd, cucumber, and wax gourd.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1) The plug seedling medium provided by the present invention uses tea residue to provide aeration, coconut husk to provide water retention, and an inorganic porous material as the matrix skeleton, meeting the seedlings' requirements for the matrix's water retention, aeration, and root growth space. By adding a functional liquid containing the active ingredients icodone, natamycin, and polyglutamic acid, it simultaneously solves the three major seedling cultivation problems of water management, disease prevention and control, and root development.

[0042] 2) The plug seedling medium provided by the present invention replaces non-renewable peat with tea residue and coconut husks after tea polyphenol extraction, achieving high-value utilization of agricultural waste. Compared with non-renewable peat, the raw material cost is low and it is more environmentally friendly;

[0043] 3) The plug tray seedling medium provided by the present invention uses tea residue with an electrical conductivity of ≤0.4mS / cm as raw material, eliminating the complex process of 7-15 days of fermentation required for traditional tea residue substrates, thereby reducing energy consumption and time costs;

[0044] 4) The preparation method of the plug tray seedling medium provided by the present invention does not require aging or fermentation after mixing and can be directly loaded into trays for use, which is suitable for large-scale seedling farms.

[0045] 5) The plug seedling medium provided by the present invention has a good seedling raising effect for large-seeded melons that have high requirements for water retention and aeration, can significantly increase the dry weight, leaf area, root length and seedling index of the seedlings, and has great market potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a comparison chart of cucumber seedling growth in different plug tray seedling substrates in Experimental Example 1;

[0047] Figure 2 This is a comparison of leaves of seedlings grown in different plug tray seedling substrates in Experimental Example 2;

[0048] Figure 3 This is a comparison of the stems of seedlings in different plug tray seedling substrates in Experimental Example 2;

[0049] Figure 4 This is a comparison of the root systems of seedlings in different plug tray seedling media in Experimental Example 2. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below using specific examples. Unless otherwise specified, the raw materials, reagents, and apparatus used in the examples and comparative examples are available from conventional commercial sources or by conventional methods. Unless otherwise specified, all experimental or testing methods are conventional in the art.

[0051] Note: “Parts” in the following examples and comparative examples refer to “parts by mass” unless otherwise specified.

[0052] Example 1

[0053] This embodiment provides a plug tray seedling medium, the components and contents of which are shown in Table 1:

[0054] Table 1 Components and contents of the plug seedling medium in Example 1

[0055]

[0056] The preparation method of the functional liquid is as follows:

[0057] At 20-30°C, completely dissolve natamycin and polyglutamic acid in deionized water, then slowly add ectoine while stirring until ectoine is completely dissolved in deionized water to obtain a functional liquid, which is then stored at 2-5°C.

[0058] The preparation method of the plug tray seedling medium is as follows:

[0059] Evenly mix tea residue, coconut husk and vermiculite, then slowly pour in the functional liquid, stirring while pouring until completely mixed to obtain the plug tray seedling medium.

[0060] The physical and chemical indicators of the plug tray seedling medium are: moisture content 41%, total porosity 80%, bulk density 0.35g / cm 3 , conductivity is 0.21mS / cm, pH=6.8.

[0061] Example 2

[0062] This embodiment provides a plug tray seedling medium, the components and contents of which are shown in Table 2:

[0063] Table 2 Components and contents of the plug seedling medium in Example 2

[0064]

[0065]

[0066] The preparation method of the functional liquid is as follows:

[0067] At 20-30°C, completely dissolve natamycin and polyglutamic acid in deionized water, then slowly add ectoine while stirring until ectoine is completely dissolved in deionized water to obtain a functional liquid, which is then stored at 2-5°C.

[0068] The preparation method of the plug tray seedling medium is as follows:

[0069] Evenly mix tea residue, coconut husk and vermiculite, then slowly pour in the functional liquid, stirring while pouring until completely mixed to obtain the plug tray seedling medium.

[0070] The physical and chemical indicators of the plug tray seedling medium are: moisture content 43%, total porosity 86%, bulk density 0.21g / cm 3 , conductivity is 0.36mS / cm, pH=6.0.

[0071] Example 3

[0072] This embodiment provides a plug tray seedling medium, the components and contents of which are shown in Table 3:

[0073] Table 3 Components and contents of the plug seedling medium in Example 3

[0074]

[0075]

[0076] The preparation method of the functional liquid is as follows:

[0077] At 20-30°C, completely dissolve natamycin and polyglutamic acid in deionized water, then slowly add ectoine while stirring until ectoine is completely dissolved in deionized water to obtain a functional liquid, which is then stored at 2-5°C.

[0078] The preparation method of the plug tray seedling medium is as follows:

[0079] Evenly mix tea residue, coconut husk and vermiculite, then slowly pour in the functional liquid, stirring while pouring until completely mixed to obtain the plug tray seedling medium.

[0080] The physical and chemical indicators of the plug tray seedling medium are: moisture content 50%, total porosity 75%, bulk density 0.36g / cm 3 , conductivity is 0.34mS / cm, pH=6.5.

[0081] Example 4

[0082] This embodiment provides a plug tray seedling medium, the components and contents of which are shown in Table 4:

[0083] Table 4 Components and contents of the plug seedling matrix in Example 4

[0084]

[0085] The preparation method of the functional liquid is as follows:

[0086] At 20-30°C, completely dissolve natamycin and polyglutamic acid in deionized water, then slowly add ectoine while stirring until ectoine is completely dissolved in deionized water to obtain a functional liquid, which is then stored at 2-5°C.

[0087] The preparation method of the plug tray seedling medium is as follows:

[0088] Evenly mix tea residue, coconut husk and vermiculite, then slowly pour in the functional liquid, stirring while pouring until completely mixed to obtain the plug tray seedling medium.

[0089] The physical and chemical indicators of the plug tray seedling medium are: moisture content 48%, total porosity 74%, bulk density 0.31g / cm 3 , conductivity is 0.38mS / cm, pH=6.7.

[0090] Comparative Example 1

[0091] This comparative example provides a plug tray seedling medium, the components and contents of which are shown in Table 5:

[0092] Table 5 Components and contents of the plug seedling matrix in Comparative Example 1

[0093]

[0094] The preparation method of the plug tray seedling medium is as follows:

[0095] The tea residue, coconut husk and vermiculite are evenly mixed to obtain the plug tray seedling medium.

[0096] The physical and chemical indicators of the seedling tray substrate are: moisture content 50%, total porosity 76%, bulk density 0.36g / cm 3 , conductivity is 0.20mS / cm, pH=6.5.

[0097] Comparative Example 2

[0098] A commercially available seedling raising medium consisting of coconut coir, peat, carbonized rice husk and perlite was used as a comparison.

[0099] Test Example 1

[0100] The plug seedling medium prepared in Example 4 and Comparative Example 1 was used to grow Yuexiu No. 3 cucumber seedlings, specifically as follows:

[0101] Seedling raising conditions: Seedling raising greenhouse, temperature controllable, seedling raising bed height 80cm, width 150cm;

[0102] Environmental temperature: Adjust according to the seedling raising process. Generally, the daytime temperature is controlled at 23-28℃, and the night temperature is controlled at 15-20℃.

[0103] The steps of seed treatment, sowing, and seedling management were carried out in accordance with DB22 / T 3493-2023 "Technical Procedures for Cucumber Plug Tray Grafting Seedlings". On the 20th day after the emergence of Yuexiu No. 3 cucumber seeds, the dry weight, cotyledon area, leaf area, root length and seedling index of the cucumber seedlings were measured, and the average value of multiple measurements was taken as the test result.

[0104] Table 1 Test results of cucumber seedling quality in different plug seedling substrates in Test Example 1

[0105]

[0106] Table 1 is the quality test results of cucumber seedlings in different plug tray seedling substrates of Experimental Example 1. It can be seen from Table 1 that compared with the cucumber seedlings cultivated using the substrate in Comparative Example 1, the dry weight, cotyledon area, leaf area, root length and seedling index of the cucumber seedlings cultivated using the substrate in Example 4 were increased by approximately 18%, 33%, 41%, 14% and 12.5%, respectively, indicating that adding a functional liquid with icodine, natamycin and polyglutamic acid as active ingredients to the plug tray seedling substrate can significantly improve the seedling biomass, leaf development and root growth, the natamycin in the functional liquid can inhibit diseases and reduce root rot, the polyglutamic acid has a significant root-promoting effect, and the root length is significantly increased.

[0107] Figure 1 This is a comparison chart of cucumber seedling growth in different plug tray seedling substrates in Experimental Example 1. Figure 1 It can be seen that the cucumber seedlings cultivated using the substrate in Example 4 have dark green leaves and thick stems, while the cucumber seedlings cultivated using the substrate in Comparative Example 1 have yellowish leaves and shorter stems, indicating that the active ingredients in the functional liquid have an important influence on the seedling cultivation effect.

[0108] Test Example 2

[0109] The plug seedling medium in Example 4 and Comparative Example 2 was used for growing seedlings of wax gourd, wax gourd, bitter gourd, pumpkin and loofah, wherein the wax gourd variety was Tiezhu No. 2, the wax gourd variety was Yueguang wax gourd, the bitter gourd variety was Bilv No. 3, the pumpkin variety was Xiangmi small pumpkin, and the loofah variety was Yuexiu No. 3, as follows:

[0110] Seedling raising conditions: Seedling raising greenhouse, temperature controllable, seedling raising bed height 80cm, width 150cm;

[0111] Ambient temperature: Adjust according to the seedling raising process. Generally, the daytime temperature is controlled at 23-28℃, and the night temperature is controlled at 15-20℃.

[0112] On the 20th day after the emergence of various seeds, the dry weight, leaf area, root length and seedling index of the seedlings were measured, and the average value of multiple measurements was taken as the test result.

[0113] Table 2 Test results of seedling quality in different plug seedling substrates in Test Example 2

[0114]

[0115]

[0116] Table 2 is the seedling quality test results in different plug seedling substrates of Experimental Example 2. It can be seen from Table 2 that for multiple species of wax gourd, wax gourd, bitter gourd, pumpkin and loofah, when the substrate in Example 4 is used for seedling cultivation, the dry weight, leaf area, root length and seedling index of the melon seedlings are all better than those in Comparative Example 2. Among them, the leaf area of ​​the pumpkin is increased by 278%, indicating that the substrate has good aeration and significantly promotes leaf expansion; the root length of the wax gourd increases by 98%, thanks to the vermiculite pore structure and the root-promoting effect of polyglutamic acid; the seedling index of the pumpkin is increased by 145%, indicating that the substrate provided by the present invention is suitable for seedling cultivation of large-seeded melons.

[0117] Figure 2 This is a comparison of leaves of seedlings in different plug tray seedling substrates in Test Example 2. Figure 2 It can be seen that when the substrate in Example 4 is used for seedling cultivation, compared with the substrate in Comparative Example 2 for melon seedling cultivation, the leaves of wax gourd, wax gourd, bitter melon, pumpkin and loofah seedlings are thicker and have a larger leaf area.

[0118] Figure 3 This is a comparison of the stems of seedlings in different plug tray seedling substrates in Test Example 2. Figure 3 It can be seen that when the substrate in Example 4 is used for seedling cultivation, the stem diameter of the wax gourd, wax gourd, bitter gourd, pumpkin and loofah seedlings is significantly better than that of the melon seedlings cultivated in the substrate of Comparative Example 2.

[0119] Figure 4 This is a comparison of the root systems of seedlings in different plug tray seedling substrates in Test Example 2. Figure 4It can be seen that when the substrate in Example 4 is used for seedling cultivation, the root systems of wax gourd, wax gourd, bitter gourd, pumpkin and loofah seedlings are well developed and have white fibrous roots, while the root systems of melon seedlings cultivated in Comparative Example 2 are sparse and partially black, indicating that the peat substrate is easy to compact.

[0120] The above results show that the plug tray seedling medium provided by the present invention has a good seedling raising effect for large-seeded melons such as winter melon, pumpkin, and wax gourd that have high requirements for water retention and aeration, and has an outstanding seedling strengthening effect, with well-developed root systems and high biomass of the melon seedlings.

Claims

1. A plug tray seedling medium, characterized in that The invention comprises the following components: tea residue, coconut chaff, inorganic porous material and functional liquid; wherein the functional liquid comprises the following components: icodine, natamycin and polyglutamic acid.

2. The plug tray seedling culture matrix according to claim 1, wherein The physical and chemical indicators of the plug tray seedling medium include at least one of the following: a moisture content of 30%-50%; a total porosity of 60%-95%; a bulk density of 0.2-0.8 g / cm 3 ; Conductivity ≤ 1mS / cm; pH = 6.0-7.

5.

3. The plug tray seedling culture matrix according to claim 1, wherein The tea residue is the leftover material after tea polyphenols are extracted from tea raw materials; the conductivity of the tea residue is ≤0.4mS / cm.

4. The plug tray seedling culture matrix according to claim 1, wherein The electrical conductivity of the coconut husk is ≤0.7 mS / cm.

5. The plug tray seedling substrate according to claim 1, wherein The particle size of the inorganic porous material is 2-5 mm.

6. The plug tray seedling substrate according to claim 5, wherein The inorganic porous material is selected from at least one of vermiculite and perlite.

7. The plug tray seedling substrate according to claim 1, wherein The functional liquid includes the following components in parts by mass: 5-15 parts of ectoine, 1-5 parts of natamycin, 5-15 parts of polyglutamic acid, and 80-120 parts of water.

8. The plug tray seedling substrate according to any one of claims 1 to 7, characterized in that: The plug tray seedling culture matrix includes the following components by mass: 10-35 parts of tea residues, 10-35 parts of coconut bran, 10-35 parts of inorganic porous material, and 5-15 parts of functional liquid.

9. The method for preparing the plug tray seedling culture medium according to claim 8, wherein The following steps are involved: Firstly, tea residue, coconut husk and inorganic porous material are mixed, and then functional liquid is added and mixed evenly to obtain the plug tray seedling culture medium.

10. Use of the plug seedling medium according to any one of claims 1 to 8 in growing melon vegetable seedlings.

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