Multifunctional suspended fertilizer, preparation method, application and fertilization method thereof

Abstract

The application relates to the technical field of fertilizers, and particularly discloses a multifunctional suspending fertilizer, a preparation method, application and fertilization method thereof. The multifunctional suspending fertilizer comprises the following components: 10-20 parts of seaweed polysaccharide, 1-5 parts of seaweed oligosaccharide, 20-30 parts of a phosphorus component, 1-10 parts of a zinc component, 1-10 parts of a nutrient component, 30-40 parts of a suspending agent and 40-50 parts of water; the seaweed polysaccharide is obtained by enzymolysis of seaweed raw materials by a first enzyme preparation; the seaweed oligosaccharide is obtained by enzymolysis of seaweed polysaccharide by a second enzyme preparation; the first enzyme preparation is composed of cellulase, pectinase and glucose isomerase at a weight ratio of 1:(0.6-0.8):(0.4-0.6); and the second enzyme preparation is mannanase and / or guluronase. The multifunctional suspending fertilizer has the advantages of improving the content of vitamin C and sugar in fruits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fertilizers, and more particularly to a multifunctional suspended fertilizer, a preparation method, application and fertilization method thereof. BACKGROUND

[0002] In recent years, with the popularization and application of modern agricultural water and fertilizer integration technology, the advantages of liquid fertilizer products are gradually reflected, and the demand for liquid fertilizer is increasing year by year. Liquid fertilizers are mainly divided into two categories: one is clear liquid fertilizer, and the other is suspended fertilizer. Suspended fertilizer refers to the suspension of small crystals of fertilizer salt in the solution. Suspended fertilizer is divided into two categories: one is a supersaturated liquid fertilizer, that is, the nutrient substances exceeding the solubility are uniformly suspended in the system in the form of small particles; and the other is a substance that is not soluble in water, which is uniformly dispersed in the suspension system in the form of small particles.

[0003] Generally, the raw materials of suspended fertilizer and clear liquid fertilizer are the same, but the purity requirement is lower than that of clear liquid fertilizer, and the range of raw material selection is wider. At the same time, some industrial waste resources such as sugar mill waste can be applied to the production of suspended fertilizer. Suspended fertilizer has the advantages of good flowability, non-caking and low nutrient loss. Using suspended fertilizer can maintain root system and soil, and fertilizer is easy to absorb and not easy to waste.

[0004] At present, some suspended fertilizers on the market have the effect of improving the content of vitamin C and reducing sugar of tomato fruits, but the improvement effect is low. Compared with before use, the content of vitamin C is increased by about 41%, and the content of reducing sugar is increased by about 11%. Therefore, it is of great significance to develop a suspended fertilizer with better effect in improving the content of vitamin C and reducing sugar of fruits. SUMMARY

[0005] In order to further improve the content of vitamin C and reducing sugar of fruits, the present application provides a multifunctional suspended fertilizer, a preparation method, application and fertilization method thereof.

[0006] In the first aspect, the present application provides a multifunctional suspended fertilizer, which adopts the following technical scheme:

[0007] A multifunctional suspended fertilizer is composed of the following components by weight:

[0008] 10-20 parts of seaweed polysaccharide;

[0009] 1-5 parts of seaweed oligosaccharide;

[0010] 20-30 parts of phosphorus component;

[0011] 1-10 parts of zinc component;

[0012] Nutritional components 1-10 parts;

[0013] Suspension agent 30-40 parts;

[0014] Water 40-50 parts;

[0015] The seaweed polysaccharide is obtained by enzymolysis of seaweed raw materials by a first enzyme preparation;

[0016] The seaweed oligosaccharide is obtained by enzymolysis of seaweed polysaccharide by a second enzyme preparation;

[0017] The first enzyme preparation is composed of cellulase, pectinase and glucose isomerase in a weight ratio of 1: (0.6-0.8) : (0.4-0.6) ; and the second enzyme preparation is mannanase and / or guluronase.

[0018] By adopting the above technical solution, the seaweed polysaccharide in the raw material has thickening and suspension assisting effects, can reduce the antagonism between elements in the suspension fertilizer, improve the utilization rate of the suspension fertilizer, is friendly to crops and the environment, is safe to flowers, fruits and leaves of crops, can promote photosynthesis, increase the content of organic matter in fruits, and make the fruits full and sweet. By enzymolysis of part of the seaweed polysaccharide into seaweed oligosaccharide, the defect of high viscosity of the seaweed polysaccharide is improved, and the activity is improved. Meanwhile, the seaweed oligosaccharide is more easily absorbed by crops, and the fertilizer efficiency is improved. The seaweed oligosaccharide can also activate the defense response and regulate plant growth, produce active substances with disease resistance, and inhibit the formation of diseases. The seaweed polysaccharide and the seaweed oligosaccharide are used in combination, the fertilizer efficiency of the fertilizer is further improved on the basis of retaining the original functions, the crops are promoted to absorb, the root system is promoted to develop, the leaves are thickened and green, the crops are promoted to blossom and bear fruit uniformly, the content of vitamin C and sugar substances in fruits is increased, the fruits are made uniform and full, the fruits are endowed with good taste, and the market competitiveness of the fruits is improved. Therefore, by using the seaweed polysaccharide and the seaweed oligosaccharide in combination, the two play a good synergistic effect, and the content of vitamin C and the content of sugar in the fruits are effectively improved.

[0019] Enzymatic degradation has the characteristics of high efficiency and specificity. Compared with acid degradation, enzymatic degradation has mild conditions, and the hydrolysis products are not easily destroyed. By enzymatic degradation to obtain seaweed polysaccharide and seaweed oligosaccharide, the structure of the seaweed polysaccharide and the seaweed oligosaccharide is effectively ensured not to be destroyed, and the required seaweed polysaccharide and seaweed oligosaccharide can be stably obtained.

[0020] The first enzyme preparation mainly plays a role of breaking the cell wall of the red algae and the brown algae, degrading the cell wall of the red algae and the brown algae, accelerating the dissolution rate of the polysaccharide of the seaweed, and fully leaching the polysaccharide of the seaweed. The three enzymes are used together to improve the binding sites of the above enzymes on the substrate, have a synergistic effect, and can significantly improve the enzymolysis efficiency. The main component of the polysaccharide of the seaweed obtained by the enzymolysis of the red algae and the brown algae is alginate, and the alginate is composed of poly-D-mannuronic acid and poly-L-guluronic acid in different regular arrangement sequences. The second enzyme preparation includes mannuronic acid and guluronic acid, which can be used for enzymolysis of the alginate. Through the high efficiency and specificity of the enzymolysis, the required oligosaccharide of the seaweed can be stably prepared.

[0021] Preferably, the nutrient component is composed of amino acids and oligopeptides in a weight ratio of 1:(0.08-0.1). Further preferably, the amino acids are complex amino acids, and the oligopeptides are fish protein enzymatic oligopeptides.

[0022] By adopting the above technical solution, the mixed nutrient effect of multiple amino acids is good, the fertilizer effect of the complex amino acids is higher than that of a single amino acid with equal nitrogen content, and is also higher than that of inorganic nitrogen fertilizer with equal nitrogen content, thereby significantly improving the nutrient utilization rate, and the fertilizer effect takes effect quickly. The complex amino acids can be absorbed by various organs of plants, and obvious effect can be achieved in a short period after use. The small molecule oligopeptides in the nutrient component have high activity, and can promote the elongation of taproots and improve the growth of stems and leaves. The mixed use of amino acids and oligopeptides has a good synergistic effect in improving the growth of crops and the flowering and fruit setting rate.

[0023] Preferably, the suspending agent is one or more of polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, sodium lignosulfonate, sodium dodecylbenzenesulfonate, sodium bentonite, and xanthan gum.

[0024] By adopting the above technical solution, the viscosity of the multifunctional suspending fertilizer can be controlled at 300-1000 mPa.S by adding the suspending agent, and the addition of the suspending agent can obviously prevent the crystallization from growing and the solid from rapidly precipitating, thereby effectively reducing the Oswald ripening phenomenon of the suspending fertilizer.

[0025] Preferably, the phosphorus component is one or more of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and calcium hydrogen phosphate.

[0026] Preferably, the zinc component is one or more of zinc oxide, EDTA-Zn, zinc sulfate heptahydrate, and zinc sulfate monohydrate.

[0027] By adopting the above technical solution, the phosphorus and zinc elements in the multifunctional suspending fertilizer are more easily absorbed, the nutrition of the suspending fertilizer is effectively improved, the raw materials are easy to obtain, and the production is suitable for large-scale industrialization.

[0028] In a second aspect, the application provides a preparation method of the multifunctional suspended fertilizer, which adopts the following technical scheme:

[0029] A preparation method of the multifunctional suspended fertilizer, which comprises the following steps:

[0030] S1, stirring and mixing the suspending agent and deionized water at 75-85 DEG C and 800-1000 r / min for 2-4 h, and then cooling to 22-26 DEG C to obtain a mixed solution;

[0031] S2, mixing and grinding the sea polysaccharide, sea oligosaccharide, phosphorus component, zinc component and nutrient component, and then passing through a 400-mesh screen to obtain a mixture;

[0032] S3, putting the mixture obtained in S2 into the mixed solution obtained in S1, and stirring at 600-800 r / min for 20-30 min to obtain the multifunctional suspended fertilizer product.

[0033] By adopting the above technical scheme, the preparation method of the application has simple process, raw materials are easy to obtain, and the production conditions are relatively low, which is suitable for large-scale industrial production and can be stably prepared. The multifunctional suspended fertilizer prepared by the preparation method of the application has the advantages of strong stability, good fluidity, no settlement and caking, easy absorption, high fertilizer efficiency, etc.

[0034] In a third aspect, the application provides an application of the multifunctional suspended fertilizer, which adopts the following technical scheme:

[0035] The multifunctional suspended fertilizer is applied in the planting of tomatoes.

[0036] By adopting the above technical scheme, the multifunctional suspended fertilizer of the application is applied in the above crop planting, which can promote flowering, make the distribution of flowers more uniform, and make the size of flowers more consistent, improve the flowering and fruit setting rate, and make the size of fruits uniform and full, improve the content of nutrients such as vitamins and sugars in fruits, thereby improving the quality of fruits, and at the same time, improving the eating taste of fruits.

[0037] In a fourth aspect, the application provides a fertilization method of the multifunctional suspended fertilizer, which adopts the following technical scheme: a fertilization method of the multifunctional suspended fertilizer, and the fertilization mode of the multifunctional suspended fertilizer is drip irrigation or sprinkling irrigation;

[0038] The fertilization site is the root of the crop;

[0039] The fertilization frequency is 1 time / month;

[0040] The fertilization amount is 0.1-2.0 kg / acre.

[0041] By adopting the above technical solution and selecting an appropriate fertilization method for the multifunctional suspension fertilizer of this application, the suspension fertilizer can fully exert its effect, reduce the loss of ineffective fertilizer, and improve the utilization rate of the suspension fertilizer. Simultaneously, it can improve the crop's absorption efficiency of the suspension fertilizer, save water and fertilizer, and help reduce production costs and conserve resources. Applying the multifunctional suspension fertilizer of this application according to the above fertilization method can maintain the effect of the suspension fertilizer in the field for about one month. Combined with the fertilization frequency, it can provide fertilizer throughout the entire flowering and fruiting cycle of the crop, further improving the crop's fruit set rate and fruit quality.

[0042] In summary, this application has at least the following beneficial effects:

[0043] (1) This application uses a combination of seaweed polysaccharides and seaweed oligosaccharides, which have a good synergistic effect and effectively increase the vitamin C content and sugar content of the fruit.

[0044] (2) This application uses an enzymatic hydrolysis method to prepare seaweed polysaccharides and seaweed oligosaccharides. The process is gentle and effectively ensures that the structure of seaweed polysaccharides and seaweed oligosaccharides is not destroyed, and the required seaweed polysaccharides and seaweed oligosaccharides can be obtained stably. Detailed Implementation

[0045] The present application will be further described in detail below with reference to the embodiments.

[0046] Unless otherwise specified below, all raw materials used in the various embodiments of this application are commercially available:

[0047] The cellulase activity was 200,000 U / g, and it was obtained from Shandong Longkete Enzyme Preparation Co., Ltd.

[0048] The pectinase activity was 10000 U / g, and it was obtained from Shandong Longkete Enzyme Preparation Co., Ltd.

[0049] The enzyme activity of glucose isomerase was 150,000 U / g, and it was obtained from Shandong Longkete Enzyme Preparation Co., Ltd.

[0050] The seaweed raw material used is brown algae, specifically wakame seaweed, which is sourced from Rongcheng Jinding Aquatic Products Co., Ltd.

[0051] The mannouronase activity was 50,000 U / g, and it was obtained from Novozymes (China) Biotechnology Co., Ltd.

[0052] The enzyme activity of guluronase was 50,000 U / g, and it was obtained from Novozymes (China) Biotechnology Co., Ltd.

[0053] The compound amino acid is a compound amino acid powder produced by Green Source Agricultural Technology.

[0054] The spray dryer was purchased from Tokyo Rika Kiki Co., Ltd., Japan, model SD-1000.

[0055] Preparation Example

[0056] Preparation Example A1

[0057] A type of seaweed polysaccharide, the preparation steps of which are as follows:

[0058] a1. Dry wakame seaweed at 60℃ until the moisture content is below 5%, chop it, and pass it through a 40-mesh sieve to obtain wakame seaweed powder for later use.

[0059] a2, weigh 100g of wakame powder and add it to 600g of water. Stir at 200r / min for 10min, add 1mol / L concentrated hydrochloric acid to adjust the pH to 7.0, add 0.5g of the first enzyme preparation, which is composed of cellulase, pectinase and glucose isomerase in a weight ratio of 1:0.6:0.4. React at 40℃ for 24h, centrifuge at 8000r / min for 7min, and take the supernatant to obtain crude extract a;

[0060] a3. Add an equal volume of 30% ethanol solution to crude extract a, stir for 20 min, filter to obtain precipitate a, centrifuge precipitate a at 5000 r / min for 3 min, discard the supernatant to obtain seaweed polysaccharide.

[0061] Preparation Example A2

[0062] A type of seaweed polysaccharide, which differs from preparation example A1 in that, in a2, the first enzyme preparation is composed of cellulase, pectinase and glucose isomerase mixed in a weight ratio of 1:0.7:0.5.

[0063] Preparation Example A3

[0064] A type of seaweed polysaccharide, which differs from preparation example A1 in that, in a2, the first enzyme preparation is composed of cellulase, pectinase and glucose isomerase mixed in a weight ratio of 1:0.8:0.6.

[0065] Preparation Example B1

[0066] A seaweed oligosaccharide, the preparation steps of which are as follows:

[0067] b1. Weigh 100g of the seaweed polysaccharide prepared by preparation example A1 and add it to 800g of water. Stir at 200r / min for 10min. Add 1mol / L sodium hydroxide solution to adjust the pH to 7.0. Add 0.2g of the second enzyme preparation, which is composed of mannouronase and guluronase mixed in a weight ratio of 1:1. React at 45℃ for 8h. Centrifuge at 8000r / min for 7min. Take the supernatant to obtain crude extract b.

[0068] b2, crude extract b was rotary evaporated at 35℃ and 80r / min for 40min, and then spray-dried using a spray dryer with an inlet air temperature of 40℃ and a hot air flow rate of 0.5m³ / min. 3 / min, to obtain seaweed oligosaccharides.

[0069] Preparation Example B2

[0070] A seaweed oligosaccharide, which differs from preparation example B1 in that, in B1, the second enzyme preparation is mannuronase.

[0071] Preparation Example B3

[0072] A seaweed oligosaccharide, which differs from preparation example B1 in that, in B1, the second enzyme preparation is guluronase.

[0073] Example

[0074] Example 1

[0075] A multifunctional suspension fertilizer, the components and their corresponding weights are shown in Table 1, and it is prepared by the following steps:

[0076] S1, the suspending agent and water are stirred and mixed at 80℃ and 900r / min for 3h, and then cooled to 24℃ to obtain a mixture;

[0077] Sodium carboxymethyl cellulose is used as the suspending agent.

[0078] S2, mix and grind seaweed polysaccharides, seaweed oligosaccharides, phosphorus components, zinc components and nutrient components, and pass through a 400-mesh sieve to obtain a mixture;

[0079] Among them, seaweed polysaccharide was prepared by preparation example A1, seaweed oligosaccharide was prepared by preparation example B1, potassium phosphate was used as the phosphorus component, zinc chloride was used as the zinc component, and the nutrient component was a complex amino acid.

[0080] S3. Add the mixture obtained in S2 to the mixture obtained in S1, and stir at 700 r / min for 25 min to obtain the multifunctional suspension fertilizer product.

[0081] Examples 2-6

[0082] A multifunctional suspension fertilizer differs from Example 1 in that the components and their corresponding weights are shown in Table 1.

[0083]

[0084] Table 1. Components and their weights (kg) in Examples 1-6

[0085] Example 7

[0086] A multifunctional suspension fertilizer, which differs from Example 3 in that its nutrient components are composed of a mixture of compound amino acids and oligopeptides in a weight ratio of 1:0.06.

[0087] The oligopeptides are sourced from Jifeng Technology and are fish protein hydrolysate oligopeptides, with small peptides ≥40% (accounting for total protein content) and free amino acids ≥30%.

[0088] Example 8

[0089] A multifunctional suspension fertilizer, which differs from Example 7 in that its nutrient components are composed of a mixture of compound amino acids and oligopeptides in a weight ratio of 1:0.08.

[0090] Example 9

[0091] A multifunctional suspension fertilizer, which differs from Example 7 in that its nutrient components are composed of a mixture of compound amino acids and oligopeptides in a weight ratio of 1:0.09.

[0092] Example 10

[0093] A multifunctional suspension fertilizer, which differs from Example 7 in that its nutrient components are composed of a mixture of compound amino acids and oligopeptides in a weight ratio of 1:0.1.

[0094] Example 11

[0095] A multifunctional suspension fertilizer, which differs from Example 7 in that its nutrient components are composed of a mixture of compound amino acids and oligopeptides in a weight ratio of 1:0.12.

[0096] Example 12

[0097] A multifunctional suspension fertilizer, which differs from Example 9 in that the suspending agent is obtained by mixing xanthan gum and polyvinylpyrrolidone in a weight ratio of 1:1.

[0098] Example 13

[0099] A multifunctional suspension fertilizer, which differs from Example 9 in that the phosphorus component is obtained by mixing ammonium dihydrogen phosphate and potassium dihydrogen phosphate in a weight ratio of 1:0.5.

[0100] Example 14

[0101] A multifunctional suspension fertilizer, which differs from Example 9 in that the zinc component is obtained by mixing zinc sulfate heptahydrate and zinc sulfate monohydrate in a weight ratio of 1:0.3.

[0102] In addition, in other embodiments, the suspending agent may be one or more of polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, sodium lignosulfonate, sodium dodecylbenzenesulfonate, sodium bentonite, and xanthan gum; the zinc component may be one or more of zinc oxide, EDTA-Zn, zinc sulfate heptahydrate, and zinc sulfate monohydrate; and the phosphorus component may be one or more of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and calcium hydrogen phosphate.

[0103] Example 15

[0104] A multifunctional suspension fertilizer, which differs from Example 9 in that the seaweed polysaccharide in S2 is prepared by Preparation Example A2.

[0105] Example 16

[0106] A multifunctional suspension fertilizer, which differs from Example 9 in that the seaweed polysaccharide in S2 is prepared by Preparation Example A3.

[0107] Example 17

[0108] A multifunctional suspension fertilizer, which differs from Example 15 in that the seaweed oligosaccharide in S2 is prepared from Preparation Example B2.

[0109] Example 18

[0110] A multifunctional suspension fertilizer, which differs from Example 15 in that the seaweed oligosaccharide in S2 is prepared from Preparation Example B3.

[0111] Example 19

[0112] A multifunctional suspension fertilizer, differing from Example 1, is prepared through the following steps:

[0113] S1, the suspending agent and water are stirred and mixed at 75℃ and 800r / min for 2h, and then cooled to 22℃ to obtain a mixture;

[0114] S2, mix and grind seaweed polysaccharides, seaweed oligosaccharides, phosphorus components, zinc components and nutrient components, and pass through a 400-mesh sieve to obtain a mixture;

[0115] S3. Add the mixture obtained in S2 to the mixture obtained in S1, and stir at 600 r / min for 20 min to obtain the multifunctional suspension fertilizer product.

[0116] Example 20

[0117] A multifunctional suspension fertilizer, differing from Example 1, is prepared through the following steps:

[0118] S1, the suspending agent and water are stirred and mixed at 85℃ and 1000r / min for 4h, and then cooled to 26℃ to obtain a mixture;

[0119] S2, mix and grind seaweed polysaccharides, seaweed oligosaccharides, phosphorus components, zinc components and nutrient components, and pass through a 400-mesh sieve to obtain a mixture;

[0120] S3. Add the mixture obtained in S2 to the mixture obtained in S1, and stir at 800 r / min for 30 min to obtain the multifunctional suspension fertilizer product.

[0121] Comparative Example

[0122] Comparative Example 1

[0123] A suspension fertilizer, which differs from Example 1 in that the components and their corresponding weights are shown in Table 2.

[0124]

[0125] Table 2 shows the components and their weights (kg) in Example 1 and Comparative Examples 1-3.

[0126] Comparative Example 4

[0127] A suspension fertilizer, which differs from Example 1 in that, in the preparation of seaweed polysaccharide, the first enzyme preparation is composed of cellulase and pectinase mixed in a weight ratio of 1:0.6.

[0128] Comparative Example 5

[0129] A suspension fertilizer differs from Example 1 in that, in the preparation of seaweed polysaccharide, the first enzyme preparation is composed of cellulase, pectinase and glucose isomerase mixed in a weight ratio of 1:0.4:0.8.

[0130] Comparative Example 6

[0131] A suspension fertilizer, which differs from Example 1 in that, in the preparation process of seaweed polysaccharide, the first enzyme preparation is composed of cellulase, pectinase and glucose isomerase mixed in a weight ratio of 1:1:0.2.

[0132] Application Examples

[0133] Application Example 1

[0134] An application of a multifunctional suspension fertilizer, which is applied to tomato cultivation. The fertilization method of the multifunctional suspension fertilizer is: drip irrigation is used for fertilization.

[0135] Fertilizer should be applied to the root zone of the crop.

[0136] Fertilize once a month;

[0137] The fertilizer application rate is 1.0 kg / mu.

[0138] Performance testing

[0139] Test subjects: Suspension fertilizers prepared in Examples 1-20 and Comparative Examples 1-6.

[0140] Experimental location: Xintai City, Tai'an City, Shandong Province. A greenhouse was selected. The soil pH was 7.6, the organic matter content was 0.91%, the hydrolyzable nitrogen was 67.32 mg / kg, the available phosphorus was 43.27 mg / kg, and the available potassium was 199.43 mg / kg.

[0141] Test crop: Tomato greenhouse 68.

[0142] Planting method: Plant in double rows with a row spacing of 60cm and a plant spacing of 30cm.

[0143] Experimental methods: A total of 27 groups of experiments were set up. The types of suspension fertilizers applied in each group of experiments are shown in Table 3, and the fertilization was carried out according to the application example 1.

[0144]

[0145]

[0146] Table 3 Comparison of Fertilizer Types

[0147] Detection method:

[0148] (1) Determination of vitamin C content: Take 12 fresh fruits with similar size and color and plump grains, chop and break them up for later use. Weigh 100g of the chopped fruit and add 100mL of 2% oxalic acid solution. Crush to obtain a pulp. Take 20g of the pulp and dilute it with 1% oxalic acid solution to 100mL. Shake well and filter. Then determine the vitamin C content by the 2,4-dinitrophenylhydrazine colorimetric method. The test results are recorded in Table 4 below.

[0149] (2) Determination of reducing sugar content: Take 12 fresh fruits with similar size and color and plump grains, crush them into a paste, weigh 10g of the paste into a 250mL volumetric flask, remove acidity and precipitated protein with calcium carbonate and 10% lead acetate solution, and extract reducing sugar under the condition of 80℃ water bath. Determine the reducing sugar content by cyanide iodometric method. The test results are recorded in Table 4 below.

[0150]

[0151] Table 4 Performance Test Results

[0152] As shown in Table 4, the vitamin C content of tomatoes in experimental groups 1-20 was greater than 21.5 mg / 100g, while the highest vitamin C content in the control groups 1-6 was only 20.32 mg / 100g, with control groups 1-3 having a content of only 15.05-18.52 mg / 100g. The reducing sugar content of tomatoes in experimental groups 1-20 was also greater than 2.6%, while the reducing sugar content in control groups 1-6 was only 2.28-2.55%. Therefore, it is clear that the suspension fertilizer obtained in this application can significantly increase the vitamin C and reducing sugar content in fruits.

[0153] Based on Example 1 and Comparative Examples 1-3, and in conjunction with Table 4, it can be seen that the seaweed polysaccharides and seaweed oligosaccharides in the formulations of this application have a good synergistic effect and can significantly increase the vitamin C content and reducing sugar content of tomato fruits.

[0154] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A multifunctional suspension fertilizer, characterized in that, It consists of the following components in parts by weight: 10-20 parts of seaweed polysaccharide; 1-5 parts of seaweed oligosaccharides; Phosphorus component 20-30 parts; Zinc components: 1-10 parts; The nutrient component consists of 1-10 parts; the nutrient component is composed of amino acids and oligopeptides mixed in a weight ratio of 1:(0.08-0.1); the amino acids are complex amino acids, and the oligopeptides are fish protein hydrolysate oligopeptides; 30-40 parts of suspending agent; the suspending agent is one or more of polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, sodium lignosulfonate, sodium dodecylbenzenesulfonate, sodium bentonite, and xanthan gum; 40-50 parts water; The seaweed polysaccharide is obtained by enzymatic hydrolysis of seaweed raw material using a first enzyme preparation. The seaweed raw material is brown algae, specifically wakame. The seaweed oligosaccharide was obtained by enzymatic hydrolysis of seaweed polysaccharide using a second enzyme preparation; The first enzyme preparation is composed of cellulase, pectinase and glucose isomerase mixed in a weight ratio of 1:(0.6-0.8):(0.4-0.6); The second enzyme preparation is mannouronase and / or guluronase.

2. The multifunctional suspension fertilizer according to claim 1, characterized in that, The phosphorus component is one or more of ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and calcium hydrogen phosphate.

3. The multifunctional suspension fertilizer according to claim 1, characterized in that, The zinc component is one or more of zinc oxide, EDTA-Zn, zinc sulfate heptahydrate, and zinc sulfate monohydrate.

4. The method for preparing the multifunctional suspension fertilizer according to any one of claims 1-3, characterized in that, Includes the following steps: S1, Stir and mix the suspending agent and water to obtain a mixture; S2, mix and grind seaweed polysaccharides, seaweed oligosaccharides, phosphorus components, zinc components and nutrient components, and sieve to obtain a mixture; S3. Add the mixture obtained in S2 to the mixture obtained in S1, stir, and obtain a multifunctional suspension fertilizer.

5. The application of the multifunctional suspension fertilizer according to any one of claims 1-3 in tomato cultivation.

6. The fertilization method of the multifunctional suspension fertilizer according to any one of claims 1-3, characterized in that, The multifunctional suspended fertilizer is applied via drip irrigation or sprinkler irrigation. Fertilizer should be applied to the root zone of the crop. Fertilize once a month; The fertilizer application rate is 0.1-2.0 kg / mu.

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