Preparation method of strawberry seedling nutrient medium

Abstract

The present invention relates to the technical field of seedling substrates, and in particular to a preparation method of a strawberry seedling nutrient matrix, comprising the steps of: drying cleaned rice straw, crushing the rice straw, and sieving the rice straw to obtain rice straw powder; adding the rice straw powder to an 8-12 wt% NaOH solution, subjecting the mixture to alkali treatment, washing and drying the mixture to obtain modified straw; and adding the modified straw, amino clay, and humic acid to water, stirring the mixture until the water is completely absorbed to obtain a prefabricated material. The present invention converts two-dimensional modified straw into a three-dimensional composite structure through hydrogen bonding between the amino group of amino clay, the carboxyl group of humic acid, and the hydroxyl group of the modified straw, thereby overcoming the problem that the water retention capacity of the two-dimensional straw is relatively low and the buffering capacity is insufficient, and since hydrogen bonding is a non-chemical bond, humic acid can be released from the three-dimensional composite structure, providing nutrients for the strawberry seedling stage.

Description

Technical Field

[0001] The invention relates to the technical field of seedling cultivation substrates, and in particular to a method for preparing a strawberry seedling cultivation nutrient substrate. Background Art

[0002] Strawberries are a globally recognized berry with vibrant colors, unique flavor, and rich nutrition. They also feature a short growth cycle, rapid fruit production, and high economic value. In recent years, with rising consumer spending, strawberries have become increasingly popular. With the rapid expansion of strawberry plantings, the supply of strawberry seedlings has outstripped demand. Traditional strawberry nurseries are facing increasing challenges with soil-borne diseases caused by continuous cropping. However, soilless seedling cultivation, which utilizes easily disinfected and renewable substrates, overcomes the barrier of continuous cropping and addresses the problem of soil-borne diseases spreading through strawberry seedlings.

[0003] Existing strawberry seedling substrates often use peat as the main component. Although peat is a renewable material, its regeneration rate is very slow and it is often referred to as a slowly renewable material. In addition, peat is produced in the Northeast, where resources are scarce. Therefore, the cost of using peat for enterprises in Jiangxi is very high. Jiangxi is one of the important rice-based grain production areas in Jiangnan, my country. Rice straw has the characteristics of high yield, wide distribution, and stable supply. Using rice straw as a substitute for peat is a good choice. However, compared with peat, rice straw has a lower water retention capacity and significantly lower buffering capacity. In addition, rice straw has a high content of holocellulose (including cellulose and hemicellulose), especially hemicellulose, which has an unstable structure and is easily degraded during the seedling cultivation process, affecting the seedling cultivation process. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a strawberry seedling-raising nutrient medium.

[0005] To solve the above problems, the technical solutions of the present invention are as follows:

[0006] In a first aspect, the present invention provides a strawberry seedling nutrient matrix comprising the following raw materials in the following weight ratios: 20-35 parts of modified straw, 10-15 parts of amino clay, 4-10 parts of humic acid, 5-11 parts of perlite, and 5-11 parts of vermiculite; the modified straw is obtained by alkali treatment.

[0007] In a second aspect, the present invention provides a method for preparing a strawberry seedling nutrient medium, the specific steps of which are as follows:

[0008] S1: drying, crushing, and sieving the washed rice straw to obtain rice straw powder;

[0009] S2: adding rice straw powder to 8-12 wt% NaOH solution, treating with alkali, washing and drying after the treatment to obtain modified straw;

[0010] S3: adding modified straw, amino clay, and humic acid to water and stirring until the water is completely absorbed to obtain a prefabricated material;

[0011] S4: The prefabricated material, perlite and vermiculite are mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0012] Preferably, the aperture of the sieve in step S1 is 80-120 mesh.

[0013] Preferably, in step S2, the weight ratio of rice straw powder to sodium hydroxide is 10:3-5.

[0014] Preferably, the conditions for the alkali treatment in step S2 are: stirring at 50-60° C. for 2-3 hours.

[0015] Preferably, in step S3, the weight ratio of the modified straw to water is 10:8-12.

[0016] Beneficial technical effects,

[0017] The present invention first uses alkali to treat rice straw to remove the easily degradable hemicellulose in the straw. Then, through the hydrogen bonding between the amino groups of amino clay, the carboxyl groups of humic acid and the hydroxyl groups of the modified straw, the two-dimensional modified straw is converted into a three-dimensional composite structure, overcoming the problems of low water retention and insufficient buffering capacity of the two-dimensional straw. In addition, since hydrogen bonds are non-chemical bonds, humic acid can be released from the three-dimensional composite structure to provide nutrients for the strawberry seedling stage.

[0018] The three-dimensional structural system constructed by amino clay, humic acid and modified straw in the present invention is a soft system. The roots of strawberry seedlings can easily take root in the system without causing damage to the roots of the strawberry seedlings.

[0019] The raw materials used in the present invention are all renewable raw materials, among which rice has the characteristics of large yield, wide distribution and stable supply. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] Example 1

[0022] S1: drying the washed rice straw, crushing it, and sieving it through 100 mesh to obtain rice straw powder;

[0023] S2: 100 g of rice straw powder was added to 30 g of 8 wt% NaOH solution, stirred at 55°C for 2.5 hours, and washed and dried after the treatment to obtain modified straw;

[0024] S3: Add 20 g of modified straw, 10 g of amino clay, and 4 g of humic acid to 20 g of water and stir until the water is completely absorbed to obtain a prefabricated material;

[0025] S4: 54 g of prefabricated material, 5 g of perlite and 5 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0026] Example 2

[0027] S1: Same as Example 1;

[0028] S2: Same as Example 1:

[0029] S3: Add 28 g of modified straw, 12 g of amino clay, and 7 g of humic acid to 28 g of water and stir until the water is completely absorbed to obtain a prefabricated material;

[0030] S4: 75 g of prefabricated material, 8 g of perlite and 8 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0031] Example 3

[0032] S1: Same as Example 1;

[0033] S2: Same as Example 1:

[0034] S3: Add 35 g of modified straw, 15 g of amino clay, and 10 g of humic acid to 35 g of water and stir until the water is completely absorbed to obtain a prefabricated material;

[0035] S4: 95 g of prefabricated material, 11 g of perlite and 11 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0036] Comparative Example 1

[0037] S1: drying, crushing, and sieving the washed rice straw to obtain rice straw powder;

[0038] S2: Add 28 g of rice straw powder, 12 g of amino clay, and 7 g of humic acid to 28 g of water and stir until the water is completely absorbed to obtain a preform;

[0039] S3: 75 g of prefabricated material, 8 g of perlite and 8 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0040] Comparative Example 2

[0041] S1: Same as Example 1;

[0042] S2: Same as Example 1:

[0043] S3: Add 28g of modified straw and 7g of humic acid to 28g of water and stir until the water is completely absorbed to obtain a prefabricated material;

[0044] S4: 63 g of prefabricated material, 8 g of perlite and 8 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0045] Comparative Example 3

[0046] S1: Same as Example 1;

[0047] S2: Same as Example 1:

[0048] S3: Add 28 g of modified straw and 12 g of amino clay to 28 g of water and stir until the water is completely absorbed to obtain a preform;

[0049] S4: 68 g of prefabricated material, 8 g of perlite and 8 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0050] Comparative Example 4

[0051] S1: Same as Example 1;

[0052] S2: Same as Example 1:

[0053] S3: 28 g of modified straw, 8 g of perlite and 8 g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0054] Comparative Example 5

[0055] 28g of peat, 8g of perlite and 8g of vermiculite were mixed and stirred, and then pressed into cylindrical blocks by a molding machine to obtain a strawberry seedling nutrient medium.

[0056] Water retention performance test: First, the substrate was dried at 70°C for 1 day. Then, a 10-gram sample of each dried substrate was placed in a funnel plugged with a stopper and lined with filter paper. Sufficient water was added and the sample was allowed to stand in the funnel for 3 days. The stopper was removed from the funnel and the water was allowed to drain under gravity for 1 day. The wet substrate was weighed and the amount of water retained in the substrate was calculated as a percentage of the dry weight of the substrate.

[0057] Water retention rate (%) Example 1 1530 Example 2 1580 Example 3 1490 Comparative Example 1 1350 Comparative Example 2 1240 Comparative Example 3 750 Comparative Example 4 630 Comparative Example 5 1380

[0058] Red Beauty Strawberry Seedling Experiment: Select original seedlings with a diameter of more than 1 cm, retain 4 leaves and 1 heart, divide the original seedlings into 8 parts, and plant 100 plants in each part in the substrate described in Examples 1-3 and Comparative Examples 1-5 above. After 30 days, measure the survival rate, plant height, crown diameter, petiole length, petiole thickness, leaf length, and leaf width, and take the average value.

[0059]

[0060]

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a strawberry seedling cultivation nutrient medium, characterized in that: The specific steps are as follows: S1: drying, crushing, and sieving the washed rice straw to obtain rice straw powder; S2: adding rice straw powder to 8-12 wt% NaOH solution, treating with alkali, washing and drying after treatment to obtain modified straw; S3: adding modified straw, amino clay, and humic acid to water and stirring until the water is completely absorbed to obtain a prefabricated material; The modified straw forms a three-dimensional composite structure with the amino group of amino clay and the carboxyl group of humic acid through hydrogen bonds; S4: mixing the prefabricated material, perlite and vermiculite, and then pressing the mixture into cylindrical blocks using a molding machine to obtain a strawberry seedling nutrient medium; The strawberry seedling nutrient matrix comprises the following raw materials in the following weight ratios: 20-35 parts of modified straw, 10-15 parts of amino clay, 4-10 parts of humic acid, 5-11 parts of perlite, and 5-11 parts of vermiculite.

2. the preparation method of strawberry seedling cultivation nutrient matrix according to claim 1, in described step S1, the aperture of screen cloth is 80-120 mesh.

3. the preparation method of strawberry seedling cultivation nutrient matrix according to claim 1, in described step S2, the ratio by weight of rice straw powder and sodium hydroxide is 10:3-5.

4. The method for preparing a strawberry seedling nutrient medium according to claim 1, wherein the alkali treatment in step S2 is carried out under stirring at 50-60°C for 2-3 hours.

5. The method for preparing a strawberry seedling nutrient medium according to claim 1, wherein the weight ratio of the modified straw to water in step S3 is 10:8-12.

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