A water-soluble fertilizer for reusing pericarp of dried orange and its preparation method and application

Abstract

The present application belongs to the field of agricultural waste resource utilization and fertilizer preparation technology, and discloses a water-soluble fertilizer for reusing pericarp of dried orange and a preparation method and application thereof. The preparation method of the water-soluble fertilizer is as follows: (1) grinding the pericarp of dried orange into pulp after removing the core to obtain a core-removed pulp matrix, then adding pectinase and cellulase for enzymatic reaction, filtering to obtain an enzymatic filtrate and a filter residue; (2) adding EM bacterial liquid to the enzymatic filtrate of step (1) for mixed fermentation treatment, filtering to obtain a fermentation liquid, then mixing and dissolving the fermentation liquid, a fluorine-containing organosilicon modified amino acid surfactant and a silicon-containing water-soluble fertilizer uniformly to obtain the water-soluble fertilizer for reusing pericarp of dried orange. The fermentation liquid obtained by enzymatic fermentation of pericarp of dried orange is mixed and compounded with the silicon-containing water-soluble fertilizer, and a specific fluorine-containing organosilicon modified amino acid surfactant is used for synergistic stabilization, which can significantly improve the growth-promoting effect of the obtained water-soluble fertilizer.

Description

Technical Field

[0001] This invention belongs to the field of agricultural waste resource utilization and fertilizer preparation technology, specifically relating to a water-soluble fertilizer for the reuse of tangerine peel pulp, its preparation method and application. Background Technology

[0002] Xinhui tangerine peel has high medicinal value and is also a traditional spice and seasoning, thus its market demand is increasing daily. Tangerine peel is the main raw material for producing Xinhui tangerine peel. Since ancient times, tangerine peel has been characterized by "the essence is in the peel" and "the peel is expensive while the flesh is cheap." Since the Song Dynasty, the people of Xinhui have been "growing tangerines for the peel," as the peel is sweet and fragrant, while the "flesh is dry and inedible." Therefore, along with the production of tangerine peel, a large amount of unusable tangerine pulp is also produced (tangerine pulp accounts for about 85% of the weight of tangerine peel).

[0003] Currently, the main method for reusing the pulp of Chenpi tangerines is composting. However, composting has low utilization rates and suffers from problems such as large space requirements, easy rotting and the generation of odorous gases, and exacerbation of soil acidification, thus limiting its application. Chinese invention patent CN 109793099A discloses a processing technology for Xinhui tangerine pulp. First, a composite enzyme made from pectinase and cellulase softens the pith and fibrous tissue of the Xinhui tangerine. Then, different separation machines separate the tangerine pulp into fruit juice, pulp, and seeds. The fruit juice is mixed with appropriate amounts of EM probiotics and humic acid for fermentation to produce organic fertilizer. However, the water-soluble fertilizer prepared through enzymatic hydrolysis and fermentation of the pulp has a high content of polysaccharides, amino acids, and other organic matter. If used as root fertilizer for water-requiring plants such as rice, it can lead to eutrophication due to slow absorption and low utilization rates, affecting rice growth. If used as foliar fertilizer, the high surface tension of amino acids and other organic matter results in poor wetting of rice leaves, also leading to reduced absorption rates. In addition, rice, as a silicon-loving plant, has a high demand for silicon. Silicon can improve rice photosynthesis, strengthen stems, enhance lodging resistance, promote root development, and increase root activity. However, organic fertilizer made from tangerine peel pulp is insufficient to meet the silicon requirements of rice and other silicon-loving plants. Compounding with water-soluble silicon fertilizer is a feasible approach. However, water-soluble organic fertilizer prepared by enzymatic hydrolysis and fermentation of tangerine peel pulp is weakly acidic, and its stability is easily compromised when compounded with water-soluble silicon fertilizer. Summary of the Invention

[0004] In view of the shortcomings and deficiencies of the existing technology, the primary objective of this invention is to provide a method for preparing a water-soluble fertilizer for the reuse of tangerine peel pulp.

[0005] Another object of the present invention is to provide a water-soluble fertilizer prepared by the above method.

[0006] Another object of the present invention is to provide the above-mentioned water-soluble fertilizer as a foliar fertilizer for rice.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp includes the following preparation steps:

[0009] (1) After removing the seeds from the pulp of the tangerine peel, grind it into a pulp to obtain a seedless pulp matrix. Then add pectinase and cellulase to carry out enzymatic hydrolysis reaction, filter, and obtain enzymatic hydrolysis filtrate and filter residue.

[0010] (2) Add EM bacterial solution to the enzymatic hydrolysis filtrate in step (1) for mixed fermentation treatment, filter to obtain fermentation liquid, and then mix and dissolve the fermentation liquid with fluorine-containing organosilicon modified amino acid surfactant and silicon-containing water-soluble fertilizer to obtain water-soluble fertilizer for reuse of tangerine peel pulp.

[0011] Further, in step (1), the mass concentration of pectinase added is 0.5-2%, and the mass concentration of cellulase added is 0.2-1%.

[0012] Furthermore, the temperature of the enzymatic hydrolysis reaction in step (1) is 30~60℃, the time of the enzymatic hydrolysis reaction is 1~3h, and the enzymatic hydrolysis reaction is carried out under stirring conditions.

[0013] Furthermore, the filter residue described in step (1) can be used as an organic fertilizer resource or added to the pulp matrix for reuse.

[0014] Further, in step (2), the amount of EM bacterial solution added is 0.5-2% of the mass of the enzymatic hydrolysis filtrate; the fermentation temperature is 20-35℃, and the fermentation time is 3-10 days.

[0015] Furthermore, the preparation method of the fluorinated organosilicon modified amino acid surfactant in step (2) is as follows:

[0016] (a) Octamethylcyclotetrasiloxane (D4), trifluoropropylmethylcyclotrisiloxane (D3F) and tetramethyldisiloxane end-capping agent (HMM) are mixed and reacted under acid catalyst conditions to obtain hydrogen-capped fluorinated silicone oil, which is then subjected to hydrosilylation reaction with epoxy-capped allyl polyether under Speier catalyst conditions to obtain epoxy polyether-capped fluorinated silicone oil;

[0017] (b) Add the amino acid and the epoxy polyether-terminated fluorinated silicone oil from step (a) to water and mix and dissolve. Then add alkali solution to adjust the pH to 9-12, keep the temperature at 60-90℃ for 1-4 hours, and dehydrate under reduced pressure after the reaction to obtain the fluorinated organosilicon modified amino acid surfactant.

[0018] Further, the molar ratio of D4, D3F and HMM in step (a) is 10:2~5:0.5~2.

[0019] Further, the acid catalyst in step (a) is acidic clay; the temperature of the mixing reaction is 60~90℃; after the mixing reaction, the acid catalyst is removed by filtration, and unreacted raw materials and low-boiling point impurities are removed by vacuum distillation.

[0020] Furthermore, the hydrosilylation reaction described in step (a) is carried out under organic solvent conditions, and the temperature of the hydrosilylation reaction is 60~90℃.

[0021] Further, the molecular weight of the epoxy-terminated allyl polyether in step (a) is 450~1000; the molar ratio of the hydrogen-terminated fluorinated silicone oil to the epoxy-terminated allyl polyether is 1:2.

[0022] Further, the amino acid mentioned in step (b) is at least one of glutamic acid, lysine, alanine, and glycine; the molar ratio of the amount of amino acid added to the epoxy group in the epoxy-terminated fluorinated silicone oil is 1:1.

[0023] The reaction principle and working principle of the fluorinated organosilicon modified amino acid surfactant of this invention are as follows:

[0024] First, a long-chain polysiloxane backbone is generated through a ring-opening equilibrium reaction of D4, D3F, and HMM. Fluorine-containing groups are introduced into the side chains, and the ends are hydrosilane-capped. Both the resulting long-chain polysiloxane backbone and the fluorine-containing side chains exhibit low surface tension, thus significantly improving the wetting effect of water-soluble fertilizers. The hydrosilane groups at the ends can undergo hydrosilylation reactions with the unsaturated double bonds of epoxy-capped allyl polyethers, thereby introducing polyether chains and terminal epoxy groups. The introduction of polyether chains improves water solubility. The introduced terminal epoxy groups undergo ring-opening grafting reactions with the amino groups of amino acids under alkaline conditions. When the molar ratio of added amino acids to the epoxy groups in the epoxy-capped fluorinated silicone oil is 1:1, a main product with a fluorine-containing polysiloxane chain in the middle and polyether and amino acid groups at both ends is obtained. The amino acid groups at both ends significantly improve the compatibility and binding force with amino acids and polysaccharide organic matter in the fermentation broth. The reaction products under the above specific conditions can better improve the wetting effect of water-soluble fertilizer and promote absorption; at the same time, they can better stabilize the mixed system of enzymatic fermentation organic fertilizer of tangerine peel pulp and silicon-containing water-soluble fertilizer, thereby significantly improving its application effect as a foliar fertilizer for rice.

[0025] Furthermore, the amount of fluorinated organosilicon modified amino acid surfactant added in step (2) is 0.5~4% of the mass of the fermentation broth.

[0026] Further, the silicon-containing water-soluble fertilizer mentioned in step (2) refers to a silicon-containing water-soluble fertilizer containing 20-80% sodium silicate or potassium silicate by mass, and the amount of silicon-containing water-soluble fertilizer added is 10-50% of the mass of the fermentation liquid.

[0027] A water-soluble fertilizer for reusing tangerine peel pulp is prepared by the above method.

[0028] The above-mentioned water-soluble fertilizers are used as foliar fertilizers for rice.

[0029] Furthermore, the application method is as follows: dilute the water-soluble fertilizer with water 300 to 1000 times and then spray it on the leaves of growing rice.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] (1) This invention uses fermentation liquid obtained by enzymatic hydrolysis and fermentation of tangerine pulp and silicon-containing water-soluble fertilizer for compound application. It can effectively utilize the organic matter and trace elements in the fermentation liquid and the silicon element in the silicon-containing water-soluble fertilizer, thereby achieving synergistic fertilizer effect and providing a good application path for the resource utilization of tangerine pulp.

[0032] (2) The present invention uses a specific fluorinated organosilicon modified amino acid surfactant to better stabilize the compound system of enzymatic fermentation liquid of tangerine peel pulp and silicon-containing water-soluble fertilizer, and can significantly promote the absorption of nutrients and silicon elements by rice leaves from enzymatic fermentation of tangerine peel pulp, thereby achieving a significant improvement in growth promotion and yield increase.

[0033] Instruction manual illustrations

[0034] Figure 1 The images show the phenotypic observation results of rice after the second treatment in Examples 1-4 and Comparative Examples 1-3.

[0035] Figure 2 The images show the phenotypic observation results of rice after the third treatment in Examples 1-4 and Comparative Examples 1-3.

[0036] Figure 3 The images show the phenotypic observation results of rice in each treatment group before sampling in Examples 1-4 and Comparative Examples 1-3.

[0037] Figure 4 The figures show the average fresh weight of the aboveground parts of rice after sampling in each treatment group of Examples 1-4 and Comparative Examples 1-3.

[0038] Figure 5 The figures show the average fresh weight of rice roots after sampling in each treatment group of Examples 1-4 and Comparative Examples 1-3. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0040] Example 1

[0041] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp includes the following preparation steps:

[0042] (1) 1000 kg of tangerine pulp was deseeded (accounting for about 5.7%) to obtain 942.9 kg of deseeded pulp, which was then ground into a pulp (loss rate of about 1%) to obtain 933.47 kg of deseeded pulp matrix.

[0043] (2) Take a portion of the pitted fruit pulp matrix, add 1% pectinase and 0.5% cellulase, and stir to carry out enzymatic hydrolysis. Control the temperature of the enzymatic hydrolysis reaction at 40~45℃ and the time at 2h. Filter to obtain enzymatic hydrolysis filtrate and filter residue. The obtained filter residue is used as organic fertilizer for resource utilization.

[0044] (3) Add 1% EM bacterial solution to the enzymatic hydrolysis filtrate in step (2) for mixed fermentation treatment. Control the fermentation temperature to be 28~32℃ and the time to be 6 days. Filter to obtain fermentation liquid. Then mix and dissolve the fermentation liquid with 2% fluorine-containing organosilicon modified amino acid surfactant and 30% silicon-containing water-soluble fertilizer (silicon-containing water-soluble fertilizer containing 60% potassium silicate) to obtain water-soluble fertilizer for reuse of tangerine peel pulp.

[0045] The preparation method of the fluorinated organosilicon modified amino acid surfactant is as follows:

[0046] (a) D4, D3F, and HMM were mixed in a molar ratio of 10:3:1, and then 2% acidic clay catalyst was added. Under nitrogen protection and stirring, the mixture was heated to 80-85°C and reacted for 5 hours. The catalyst was removed by filtration, and unreacted raw materials and low-boiling impurities were removed by vacuum distillation at 120-125°C to obtain hydrogen-terminated fluorinated silicone oil. The average molecular weight of the product was determined to be 5260 by GPC.

[0047] (b) The hydrogen-capped fluorinated silicone oil obtained in step (a) was dissolved in toluene, and then Speier catalyst and epoxy-capped allyl polyether (average molecular weight 500) were added and mixed and dissolved. The amount of epoxy-capped allyl polyether added was twice the theoretical molar amount of the hydrogen-capped fluorinated silicone oil. The mixture was heated to 80-85℃ and stirred for 5 hours. The solvent was removed by vacuum distillation at 120-125℃ to obtain epoxy-capped fluorinated silicone oil. The epoxy value of the product was determined to be 0.030 mol / 100g.

[0048] (c) Add glutamic acid and the epoxy polyether-terminated fluorinated silicone oil from step (b) to water and mix and dissolve. The molar ratio of glutamic acid to epoxy group is 1:1. Then add sodium hydroxide solution to adjust the pH to 10. Keep the reaction at 70~75℃ for 2 hours. After the reaction is completed, dehydrate under reduced pressure to obtain fluorinated organosilicon modified amino acid surfactant.

[0049] Example 2

[0050] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp includes the following preparation steps:

[0051] Step (1) is the same as in Example 1.

[0052] (2) Take a portion of the pitted fruit pulp matrix, add 1.5% pectinase and 1% cellulase, and stir to carry out enzymatic hydrolysis. Control the temperature of the enzymatic hydrolysis reaction at 40~45℃ and the time at 1h. Filter to obtain enzymatic hydrolysis filtrate and filter residue. The obtained filter residue is used as organic fertilizer for resource utilization.

[0053] (3) Add 1.5% EM bacterial solution to the enzymatic hydrolysis filtrate in step (2) for mixed fermentation treatment. Control the fermentation temperature to 25~30℃ and the time to 7 days. Filter to obtain fermentation liquid. Then mix and dissolve the fermentation liquid with 2% fluorine-containing organosilicon modified amino acid surfactant and 30% silicon-containing water-soluble fertilizer (silicon-containing water-soluble fertilizer containing 60% potassium silicate) to obtain water-soluble fertilizer for reuse of tangerine pulp.

[0054] The preparation method of the fluorinated organosilicon modified amino acid surfactant is the same as that in Example 1.

[0055] Example 3

[0056] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp differs from Example 1 in that the preparation method of the fluorinated organosilicon-modified amino acid surfactant is as follows:

[0057] (a) D4, D3F, and HMM were mixed in a molar ratio of 10:2:2, and then 2% acidic clay catalyst was added. Under nitrogen protection and stirring, the mixture was heated to 80-85°C and reacted for 5 hours. The catalyst was removed by filtration, and unreacted raw materials and low-boiling impurities were removed by vacuum distillation at 120-125°C to obtain hydrogen-terminated fluorinated silicone oil. The average molecular weight of the product was determined to be 3075 by GPC.

[0058] (b) The hydrogen-capped fluorinated silicone oil obtained in step (a) was dissolved in toluene, and then Speier catalyst and epoxy-capped allyl polyether (average molecular weight 450) were added and mixed and dissolved. The amount of epoxy-capped allyl polyether added was twice the theoretical molar amount of the hydrogen-capped fluorinated silicone oil. The mixture was heated to 80-85℃ and stirred for 5 hours. The solvent was removed by vacuum distillation at 120-125℃ to obtain epoxy-capped fluorinated silicone oil. The epoxy value of the product was determined to be 0.044 mol / 100g.

[0059] (c) Add lysine and the epoxy polyether-terminated fluorinated silicone oil from step (b) to water and mix to dissolve. The molar ratio of lysine to epoxy group is 1:1. Then add sodium hydroxide solution to adjust the pH to 10. Keep the reaction at 70~75℃ for 2 hours. After the reaction is completed, dehydrate under reduced pressure to obtain fluorinated organosilicon modified amino acid surfactant.

[0060] The amount of the fluorinated organosilicon-modified amino acid surfactant added is 4% of the mass of the fermentation broth.

[0061] Example 4

[0062] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp differs from Example 1 in that the preparation method of the fluorinated organosilicon-modified amino acid surfactant is as follows:

[0063] (a) D4, D3F, and HMM were mixed in a molar ratio of 10:5:0.5, and then 2% acidic clay catalyst was added. Under nitrogen protection and stirring, the mixture was heated to 80-85°C and reacted for 5 hours. The catalyst was removed by filtration, and unreacted raw materials and low-boiling impurities were removed by vacuum distillation at 120-125°C to obtain hydrogen-terminated fluorinated silicone oil. The average molecular weight of the product was determined to be 7820 by GPC.

[0064] (b) The hydrogen-capped fluorinated silicone oil obtained in step (a) was dissolved in toluene, and then Speier catalyst and epoxy-capped allyl polyether (average molecular weight 1000) were added and mixed and dissolved. The amount of epoxy-capped allyl polyether added was twice the theoretical molar amount of the hydrogen-capped fluorinated silicone oil. The mixture was heated to 80-85℃ and stirred for 5 hours. The solvent was removed by vacuum distillation at 120-125℃ to obtain epoxy-capped fluorinated silicone oil. The epoxy value of the product was determined to be 0.017 mol / 100g.

[0065] (c) Add alanine and the epoxy polyether-terminated fluorinated silicone oil from step (b) to water and mix to dissolve. The molar ratio of alanine to epoxy group is 1:1. Then add sodium hydroxide solution to adjust the pH to 10. Keep the reaction at 70~75℃ for 2 hours. After the reaction is completed, dehydrate under reduced pressure to obtain fluorinated organosilicon modified amino acid surfactant.

[0066] The amount of the fluorinated organosilicon modified amino acid surfactant added is 0.5% of the mass of the fermentation broth.

[0067] Comparative Example 1

[0068] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp differs from Example 1 in that: an organosilicon-modified amino acid surfactant is used instead of a fluorinated organosilicon-modified amino acid surfactant. The preparation method of the organosilicon-modified amino acid surfactant is as follows:

[0069] (a) D4 and HMM were mixed at a molar ratio of 13:1, and then 2% acidic clay catalyst was added. Under nitrogen protection and stirring, the mixture was heated to 80-85℃ and reacted for 5 hours. The catalyst was removed by filtration, and unreacted raw materials and low-boiling impurities were removed by vacuum distillation at 120-125℃ to obtain hydrogen-terminated fluorinated silicone oil. The average molecular weight of the product was determined to be 5510 by GPC.

[0070] Steps (b) and (c) are the same as in Example 1.

[0071] Comparative Example 2

[0072] A method for preparing a water-soluble fertilizer for reusing tangerine peel pulp differs from Example 1 in that: agricultural organosilicon high-penetration agent GT-248 (polyether-modified siloxane) is used instead of fluorinated organosilicon-modified amino acid surfactant.

[0073] Comparative Example 3

[0074] A method for preparing a water-soluble fertilizer for the reuse of tangerine peel pulp, which differs from Example 1 in that no silicon-containing water-soluble fertilizer is added.

[0075] The application effect of the above-obtained water-soluble fertilizer as a foliar fertilizer for rice was tested. The application test method was as follows: the water-soluble fertilizer was diluted 500 times with water and sprayed onto the leaves of growing rice. Three samples were collected from each treatment group, with 3.5g of fertilizer sown per sample. Treatments were repeated every 7 days after the rice leaves began to grow. A control group was prepared by simply spraying the same concentration of silicon-containing water-soluble fertilizer. The phenotypic observation results of rice after the second and third treatments and before harvesting are as follows: Figure 1 , Figure 2 and Figure 3 As shown in the figure. The average fresh weight of the aboveground parts of rice and the average fresh weight of the rice roots after sampling are shown in the figure. Figure 4 and Figure 5 As shown.

[0076] Depend on Figures 1-5The results show that the rice treated with the water-soluble fertilizer of this invention showed significant differences compared to the control, indicating that the combination of the enzymatically fermented organic fertilizer from tangerine peel pulp and the silicon-containing water-soluble fertilizer of this invention has a good synergistic effect. In Comparative Example 1, the surfactant used did not introduce fluorinated side chains, resulting in reduced wetting effect and consequently lower absorption efficiency of foliar fertilizer. In Comparative Example 2, the polyether-modified siloxane used did not introduce fluorinated side chains and amino acid end groups, resulting in reduced wetting effect and consequently lower absorption efficiency of foliar fertilizer. In Comparative Example 3, no silicon-containing water-soluble fertilizer was used; the use of enzymatically fermented organic fertilizer from tangerine peel pulp alone as a foliar fertilizer had limited growth-promoting effect on rice.

[0077] The storage stability of the obtained water-soluble fertilizers was tested. The test method was as follows: the water-soluble fertilizer samples were stored in a constant temperature chamber at 40±2℃ for 3 months, and then the condition of the water-soluble fertilizers was observed. The corresponding test results are shown in Table 1 below.

[0078] Table 1. Stability results of water-soluble fertilizers obtained in Examples 1-4 and Comparative Examples 1-3

[0079] test sample Stability results Example 1 Uniform and free of sediment Example 2 Uniform and free of sediment Example 3 Uniform and free of sediment Example 4 Uniform and free of sediment Comparative Example 1 Uniform and free of sediment Comparative Example 2 Obvious sedimentation and stratification Comparative Example 3 Uniform and free of sediment

[0080] As can be seen from the results in Table 1, the stability of the compounding of the enzymatic fermentation broth of tangerine peel pulp with silicon-containing water-soluble fertilizer was significantly reduced when using conventional polyether-modified siloxane surfactants without grafted amino acid groups.

[0081] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a water-soluble fertilizer for the reuse of tangerine peel pulp, characterized in that: The preparation steps include the following: (1) After removing the seeds from the pulp of the tangerine peel, grind it into a pulp to obtain a seedless pulp matrix. Then add pectinase and cellulase to carry out enzymatic hydrolysis reaction, filter, and obtain enzymatic hydrolysis filtrate and filter residue. (2) Add EM bacterial solution to the enzymatic hydrolysis filtrate in step (1) for mixed fermentation treatment, filter to obtain fermentation liquid, and then mix and dissolve the fermentation liquid with fluorine-containing organosilicon modified amino acid surfactant and silicon-containing water-soluble fertilizer to obtain water-soluble fertilizer for reuse of tangerine peel pulp.

2. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 1, characterized in that: In step (1), the mass concentration of pectinase added is 0.5-2%, and the mass concentration of cellulase added is 0.2-1%; the temperature of the enzymatic hydrolysis reaction is 30-60℃, the time of the enzymatic hydrolysis reaction is 1-3h, and the enzymatic hydrolysis reaction is carried out under stirring conditions.

3. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 1, characterized in that: The amount of EM bacterial solution added in step (2) is 0.5-2% of the mass of the enzymatic hydrolysis filtrate; the fermentation temperature is 20-35℃ and the fermentation time is 3-10 days.

4. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 1, characterized in that: The preparation method of the fluorinated organosilicon modified amino acid surfactant in step (2) is as follows: (a) D4, D3F and HMM were mixed and reacted under acid catalyst conditions to obtain hydrogen-terminated fluorinated silicone oil, and then hydrosilylated with epoxy-terminated allyl polyether under Speier catalyst conditions to obtain epoxy polyether-terminated fluorinated silicone oil. (b) Add the amino acid and the epoxy polyether-terminated fluorinated silicone oil from step (a) to water and mix and dissolve. Then add alkali solution to adjust the pH to 9-12, keep the temperature at 60-90℃ for 1-4 hours, and dehydrate under reduced pressure after the reaction to obtain the fluorinated organosilicon modified amino acid surfactant.

5. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 4, characterized in that: The molar ratio of D4, D3F and HMM in step (a) is 10:2~5:0.5~2; the acid catalyst is acidic clay; the temperature of the mixed reaction is 60~90℃; after the mixed reaction, the acid catalyst is removed by filtration, and unreacted raw materials and low-boiling point impurities are removed by vacuum distillation.

6. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 4, characterized in that: The hydrosilylation reaction in step (a) is carried out under organic solvent conditions, and the temperature of the hydrosilylation reaction is 60~90℃; the molecular weight of the epoxy-terminated allyl polyether is 450~1000; the molar ratio of the hydrogen-terminated fluorinated silicone oil to the epoxy-terminated allyl polyether is 1:

2.

7. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 4, characterized in that: The amino acid mentioned in step (b) is at least one of glutamic acid, lysine, alanine, and glycine; the molar ratio of the amount of amino acid added to the epoxy group in the fluorinated silicone oil capped with epoxy polyether is 1:

1.

8. The method for preparing a water-soluble fertilizer for reusing tangerine peel pulp according to claim 1, characterized in that: The amount of fluorinated organosilicon modified amino acid surfactant added in step (2) is 0.5-4% of the fermentation liquid mass; the silicon-containing water-soluble fertilizer refers to a silicon-containing water-soluble fertilizer containing 20-80% sodium silicate or potassium silicate by mass, and the amount of silicon-containing water-soluble fertilizer added is 10-50% of the fermentation liquid mass.

9. A water-soluble fertilizer for reusing tangerine peel pulp, characterized in that: It is prepared by the method described in any one of claims 1 to 8.

10. The application of the water-soluble fertilizer according to claim 9 as a foliar fertilizer for rice, characterized in that: The application method is as follows: dilute the water-soluble fertilizer with water 300 to 1000 times and then spray it on the leaves of growing rice.

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