A kind of special fertilizer for walnut and preparation method thereof

Abstract

The present invention discloses a walnut-specific fertilizer and a preparation method thereof, belonging to the field of walnut-specific fertilizer preparation. The raw materials for preparation include modified expanded perlite, soybean meal, sesame cake and residue, bone meal, humic acid, fulvic acid, Bacillus, Aspergillus niger, yeast, lignin, potassium sulfate, monoammonium phosphate, and calcium oxalate. The preparation steps include: pretreatment, fermentation, and granulation and packaging. The resulting walnut-specific fertilizer effectively solves the problem that bio-organic fertilizers, after application to the soil, have a short action time, tend to lose their effectiveness quickly, and require multiple topdressings, making the planting process cumbersome.

Description

Technical Field

[0001] The invention relates to the field of preparation of special fertilizer for walnuts, in particular to a special fertilizer for walnuts and a preparation method thereof. Background Art

[0002] Walnut, also known as walnut or Qiangtao, is a plant of the Juglandaceae family. It is a traditional economic tree species in my country and has a long history in my country. It is one of the world's famous "four major dried fruits". Walnut kernels are rich in nutrients and essential calcium, phosphorus, iron and other trace elements, minerals and vitamins such as carotene and riboflavin. They are beneficial to the human body and can nourish the kidneys, strengthen the essence and waist, warm the lungs and relieve asthma. They can effectively treat kidney deficiency, asthma, low back pain, blood stasis, amenorrhea, abdominal pain, blood stasis, madness, bruises and other diseases. Walnut kernels have good market prospects, are highly cultivable, and have a large market demand.

[0003] At present, when fertilizing walnut, people often use inorganic fertilizer on the market, based on nitrogen, phosphorus and potassium fertilizer, and long-term use has caused the problems such as soil compaction, serious salinization, nutrient deficiency, and low fertilizer utilization rate. Using bio-organic fertilizer can effectively solve the problem of soil compaction, but the nutrient content contained can not meet the nutritional needs of walnut far away, easily causes walnut weight to be little, and disease resistance is poor, and walnut tree is prone to various diseases and insect pests, and walnut yield is lower. If bio-organic fertilizer is applied to soil after fermentation, the nutrient content of fertilizer can be effectively improved, but the action time after being applied to soil is short, and it is easy to lose efficacy quickly, and it is necessary to carry out multiple topdressings to make walnut tree stable growth, and this makes walnut planting step become loaded down with trivial details. Therefore, a kind of walnut special fertilizer and preparation method thereof are badly needed, and it is short to solve the action time after bio-organic fertilizer is applied to soil, and it is easy to lose efficacy quickly, and it is necessary to carry out multiple topdressings to make walnut tree stable growth, and this makes walnut planting step become loaded down with trivial details. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a special fertilizer for walnuts and a preparation method thereof, so as to solve the problem that biological organic fertilizer has a short action time after being applied to the soil, is easy to lose its effectiveness quickly, requires multiple topdressing, and makes the planting steps cumbersome.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] The invention provides a special fertilizer for walnuts. The raw materials for preparing the special fertilizer for walnuts include modified expanded perlite, soybean meal, sesame cake and sesame residue, bone meal, humic acid, fulvic acid, bacillus, aspergillus niger, yeast, lignin, potassium sulfate, monoammonium phosphate and calcium oxalate.

[0007] In addition, the present invention also provides a preparation method of a special fertilizer for walnuts, which is as follows:

[0008] (1) Pretreatment: soybean meal, sesame cake residue, fulvic acid, humic acid and bone meal are mixed evenly and poured into a grinder to grind to 200-400 μm, and then placed under ultraviolet light for sterilization to obtain mixed organic matter;

[0009] (2) Fermentation treatment: Bacillus, Aspergillus niger, yeast and modified expanded perlite are stirred and mixed uniformly, and then a preliminary fermentation is performed; then mixed organic matter and lignin are added and mixed uniformly, and fermented again to obtain bio-organic matter;

[0010] (3) Granulation and packaging: biological organic matter, potassium sulfate, monoammonium phosphate and calcium oxalate are mixed and added into a blender, and granulated by a rotating disk to form special fertilizer granules with a particle size of 1-3 cm. The granules are coated by a coating machine, conveyed by a belt to a finished product storage hopper, and then transported to an automatic packaging machine for packaging to obtain walnut-specific fertilizer.

[0011] Furthermore, the mass ratio of the soybean meal, sesame cake residue, fulvic acid, humic acid and bone powder is 4:5:1:1:3; the mass ratio of the Bacillus, Aspergillus niger, yeast and modified expanded perlite is 0.02:0.01:0.01:5.

[0012] Furthermore, the mass ratio of the biological organic matter, potassium sulfate, monoammonium phosphate and calcium oxalate is 30:0.5:0.5:0.1.

[0013] Furthermore, the UV light intensity for sterilization under UV lamp in step (1) is: 100-120uW / cm 2 , time: 1-2h.

[0014] Furthermore, the conditions for the initial fermentation in step (2) are: temperature 38-42° C., humidity 65%-75%, and time 6-8 hours.

[0015] Furthermore, the conditions for the second fermentation in step (2) are: temperature 35-37° C., humidity 65%-75%, and time 8-12 days.

[0016] Furthermore, the raw materials for preparing the modified expanded perlite include: expanded perlite, calcium carbonate, 1 wt% sodium chloride solution, potassium dihydrogen phosphate, glucose and seaweed chitin.

[0017] Furthermore, the preparation method of the modified expanded perlite in step (2) is as follows:

[0018] Potassium dihydrogen phosphate, glucose, calcium carbonate and seaweed chitosan are added to a 1wt% sodium chloride solution, stirred and reacted at 80-120°C for 10-20 minutes, and then expanded perlite is added. After continuing to stir while cooling to 40°C, stirring at a constant temperature for 0.5-1 hour, and cooling to room temperature to obtain modified expanded perlite.

[0019] Furthermore, the mass ratio of the potassium dihydrogen phosphate, glucose, calcium carbonate, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite is (1-2): (3-5): (8-12): (2-4): (200-300): (20-30).

[0020] The present invention grinds and mixes soybean meal, hemp cake residue, fulvic acid, humic acid, and bone meal uniformly, disinfects and sterilizes the mixture to produce mixed organic matter. Using Bacillus, Aspergillus niger, and yeast as active bacteria, the modified expanded perlite is subjected to a preliminary fermentation treatment, and then the mixed organic matter and lignin are added for secondary fermentation to produce bio-organic matter. Calcium carbonate in the modified expanded perlite is adsorbed into the pores of the expanded perlite and reacts with other metal ions in the expanded perlite to form carbonates. During the initial fermentation, glucose and seaweed chitin in the modified expanded perlite decompose to produce a large amount of humic acid that reacts with the carbonates. With the addition of the mixed organic matter, the humic acid increases, the carbonates in the pores of the expanded perlite are gradually consumed, and the pore size of the expanded perlite gradually increases. This increases the organic matter loading capacity and facilitates the decomposition of the mixed organic matter during secondary fermentation. The released carbon dioxide makes the mixed organic matter more loose, resulting in a walnut fertilizer that is less likely to clump and easily disperses after application. The mixed organic matter and lignin are fermented again and expand after fermentation, so that the bio-organic fertilizer is fixed in the pores of the modified perlite, so that it is slowly released after being applied to the soil.

[0021] Beneficial effects:

[0022] 1. The present invention successfully produces a walnut-specific fertilizer rich in nutrients, which can be effectively absorbed and utilized by walnut trees. The preparation process is simple, time-saving, and suitable for large-scale production.

[0023] 2. After one year of application of the prepared walnut fertilizer, the annual growth of the walnut tree can reach 3.41cm and the annual growth of the crown width can reach 5.67m. 2 The annual growth of the tree height can reach 1.73m.

[0024] 3. One year after the application of the prepared walnut-specific fertilizer, the longitudinal diameter of the walnut nuts was 46.28 mm, the transverse diameter was 37.16 mm, the lateral diameter was 37.41 mm, the single fruit weight was 18.02 g, and the kernel yield was 66.94%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 : Growth characteristics of walnut trees after treatment in experimental group 1;

[0026] Figure 2 : Appearance of walnut dried fruits in experimental group 1 and control group. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the embodiments and accompanying drawings:

[0028] Example 1: Preparation of modified expanded perlite

[0029] As shown in Table 1, potassium dihydrogen phosphate, glucose, calcium carbonate, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0030] Potassium dihydrogen phosphate, glucose, calcium carbonate and seaweed chitosan were weighed separately and added to a 1wt% sodium chloride solution, heated to 100°C, stirred and reacted for 15 minutes, and then expanded perlite was added. After continuing to stir while cooling to 40°C, it was stirred at a constant temperature for 0.8 hours. After the reaction was completed, it was cooled to room temperature to obtain modified expanded perlite.

[0031] Table 1

[0032] Potassium dihydrogen phosphate glucose calcium carbonate Seaweed Chitosan 1wt% sodium chloride solution Expanded perlite 1.5kg 4.0kg 10.0kg 3.0kg 300.0kg 25.0kg

[0033] Example 2: Preparation of modified expanded perlite

[0034] As shown in Table 2, potassium dihydrogen phosphate, glucose, calcium carbonate, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0035] Potassium dihydrogen phosphate, glucose, calcium carbonate and seaweed chitosan were weighed separately, added to a 1wt% sodium chloride solution, heated to 80°C, stirred and reacted for 20 minutes, and then expanded perlite was added. After continuing to stir while cooling to 40°C, the solution was stirred at a constant temperature for 0.8 hours. After the reaction was completed, the solution was cooled to room temperature to obtain modified expanded perlite.

[0036] Table 2

[0037] Potassium dihydrogen phosphate glucose calcium carbonate Seaweed Chitosan 1wt% sodium chloride solution Expanded perlite 1.0kg 3.0kg 8.0kg 2.0kg 200.0kg 20.0kg

[0038] Example 3: Preparation of modified expanded perlite

[0039] As shown in Table 3, potassium dihydrogen phosphate, glucose, calcium carbonate, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0040] Potassium dihydrogen phosphate, glucose, calcium carbonate and seaweed chitosan were weighed separately, added to a 1 wt% sodium chloride solution, heated to 120°C and stirred for reaction for 10 minutes, then expanded perlite was added, and the temperature was continued to be lowered to 40°C while stirring, and stirred at a constant temperature for 0.8 hours. After the reaction was completed, it was cooled to room temperature to obtain modified expanded perlite.

[0041] Table 3

[0042] Potassium dihydrogen phosphate glucose calcium carbonate Seaweed Chitosan 1wt% sodium chloride solution Expanded perlite 2.0kg 5.0kg 12.0kg 4.0kg 240.0kg 30.0kg

[0043] Example 4: Preparation of special fertilizer for walnut

[0044] This example uses the modified expanded perlite prepared in Example 1 to prepare a special fertilizer for walnuts, and the specific steps are as follows:

[0045] (1) Pretreatment: 8 kg soybean meal, 10 kg sesame cake residue, 2 kg fulvic acid, 2 kg humic acid and 6 kg bone meal were mixed evenly and poured into a grinder to grind to 200-400 μm. 2 Sterilize under ultraviolet light for 1.5 hours to obtain mixed organic matter;

[0046] (2) Fermentation treatment: 0.02 kg of Bacillus, 0.01 kg of Aspergillus niger, 0.01 kg of yeast, and 5 kg of modified expanded perlite were stirred and mixed uniformly, and then fermented for 7 h at a temperature of 40 ° C. and a humidity of 70%. Subsequently, 25 kg of mixed organic matter and 5 kg of lignin were added and mixed uniformly, and then fermented again for 10 days at a temperature of 36 ° C. and a humidity of 70% to obtain biological organic matter;

[0047] (3) Granulation and packaging: 30 kg of biological organic matter, 0.5 kg of potassium sulfate, 0.5 kg of monoammonium phosphate and 0.1 kg of calcium oxalate are mixed and added into a blender. After being dried and granulated by a rotating disc, special fertilizer granules with a particle size of about 2 cm are prepared. The granules are coated by a coating machine, conveyed by a belt to a finished product storage hopper, and then transported to an automatic packaging machine for packaging to obtain a special fertilizer for walnuts.

[0048] Example 5: Preparation of walnut fertilizer

[0049] This example uses the modified expanded perlite prepared in Example 2 to prepare a special fertilizer for walnuts, and the specific steps are as follows:

[0050] (1) Pretreatment: 8 kg soybean meal, 10 kg sesame cake residue, 2 kg fulvic acid, 2 kg humic acid and 6 kg bone meal were mixed evenly and poured into a grinder to grind to 200-400 μm. The mixture was placed under 100 uW / cm 2 Sterilize under ultraviolet light for 2 hours to obtain mixed organic matter;

[0051] (2) Fermentation treatment: 0.02 kg of Bacillus, 0.01 kg of Aspergillus niger, 0.01 kg of yeast, and 5 kg of modified expanded perlite were stirred and mixed uniformly, and then fermented for 8 hours at a temperature of 38°C and a humidity of 65%. Subsequently, 25 kg of mixed organic matter and 5 kg of lignin were added and mixed uniformly, and then fermented again at a temperature of 35°C and a humidity of 65% for 8 days to obtain biological organic matter.

[0052] (3) Granulation and packaging: 30 kg of biological organic matter, 0.5 kg of potassium sulfate, 0.5 kg of monoammonium phosphate and 0.1 kg of calcium oxalate are mixed and added into a blender. After being dried and granulated by a rotating disc, special fertilizer granules with a particle size of about 2 cm are prepared. The granules are coated by a coating machine, conveyed by a belt to a finished product storage hopper, and then transported to an automatic packaging machine for packaging to obtain a special fertilizer for walnuts.

[0053] Example 6: Preparation of walnut fertilizer

[0054] This embodiment adopts the modified expanded perlite prepared in Example 3 to prepare walnut fertilizer, and the specific steps are as follows:

[0055] (1) Pretreatment: 16 kg soybean meal, 20 kg sesame cake residue, 4 kg fulvic acid, 4 kg humic acid and 12 kg bone meal were mixed evenly and poured into a grinder to grind to 200-400 μm. The mixture was placed under 100 uW / cm 2 Sterilize under ultraviolet light for 2 hours to obtain mixed organic matter;

[0056] (2) Fermentation treatment: 0.04 kg of Bacillus, 0.02 kg of Aspergillus niger, 0.02 kg of yeast, and 10 kg of modified expanded perlite were stirred and mixed uniformly, and then fermented for 6 h at a temperature of 42 ° C. and a humidity of 75%. Subsequently, 50 kg of mixed organic matter and 10 kg of lignin were added and mixed uniformly, and then fermented again for 12 days at a temperature of 37 ° C. and a humidity of 75% to obtain biological organic matter.

[0057] (3) Granulation and packaging: 30 kg of biological organic matter, 0.5 kg of potassium sulfate, 0.5 kg of monoammonium phosphate and 0.1 kg of calcium oxalate are mixed and added into a blender. After being dried and granulated by a rotating disc, special fertilizer granules with a particle size of about 2 cm are prepared. The granules are coated by a coating machine, conveyed by a belt to a finished product storage hopper, and then transported to an automatic packaging machine for packaging to obtain a special fertilizer for walnuts.

[0058] Comparative Example 1: Preparation of special fertilizer for walnuts

[0059] This comparative example is in contrast to Example 4, the only difference being that modified expanded perlite is not added in step (2) of preparing the walnut fertilizer. The remaining steps are the same, and step (2) is specifically as follows:

[0060] (2) Fermentation treatment: 0.02 kg of Bacillus, 0.01 kg of Aspergillus niger and 0.01 kg of yeast were stirred and mixed evenly, and then fermented for 7 hours at a temperature of 40°C and a humidity of 70%. 25 kg of mixed organic matter and 5 kg of lignin were added and mixed evenly, and then fermented again for 10 days at a temperature of 36°C and a humidity of 70% to obtain biological organic matter.

[0061] Comparative Example 2: Preparation of special fertilizer for walnuts

[0062] This comparative example is in contrast to Example 4, the only difference being that no calcium carbonate is added to the modified expanded perlite during the preparation process. The remaining steps are the same. The preparation of the modified expanded perlite is specifically as follows:

[0063] As shown in Table 4, potassium dihydrogen phosphate, glucose, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0064] Potassium dihydrogen phosphate, glucose and seaweed chitosan were weighed separately and added to a 1wt% sodium chloride solution, heated to 100°C, stirred and reacted for 15 minutes, and then expanded perlite was added. After continuing to stir while cooling to 40°C, the solution was stirred at a constant temperature for 0.8 hours. After the reaction was completed, it was cooled to room temperature to obtain modified expanded perlite.

[0065] Table 4

[0066]

[0067] Comparative Example 3: Preparation of special fertilizer for walnuts

[0068] This comparative example is in contrast to Example 4, the only difference being that no glucose was added during the preparation of the modified expanded perlite used. The remaining steps are the same. The preparation of the modified expanded perlite is specifically as follows:

[0069] As shown in Table 5, potassium dihydrogen phosphate, calcium carbonate, seaweed chitosan, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0070] Potassium dihydrogen phosphate, calcium carbonate and seaweed chitosan were weighed separately, added to a 1wt% sodium chloride solution, heated to 100°C, stirred and reacted for 15 minutes, and then expanded perlite was added. After continuing to stir while cooling to 40°C, the solution was stirred at a constant temperature for 0.8 hours. After the reaction was completed, it was cooled to room temperature to obtain modified expanded perlite.

[0071] Table 5

[0072]

[0073]

[0074] Comparative Example 4: Preparation of special fertilizer for walnuts

[0075] This comparative example is in contrast to Example 4, the only difference being that no seaweed chitosan is added during the preparation of the modified expanded perlite used. The remaining steps are the same. The modified expanded perlite is prepared as follows:

[0076] As shown in Table 6, potassium dihydrogen phosphate, glucose, calcium carbonate, 1 wt% sodium chloride solution and expanded perlite were weighed to prepare modified expanded perlite. The specific operation was as follows:

[0077] Potassium dihydrogen phosphate, glucose, and calcium carbonate were weighed separately and added to a 1 wt% sodium chloride solution, heated to 100°C, and stirred for reaction for 15 minutes. Subsequently, expanded perlite was added, and the temperature was lowered to 40°C while continuing to stir. The solution was stirred at a constant temperature for 0.8 hours. After the reaction was completed, the solution was cooled to room temperature to obtain modified expanded perlite.

[0078] Table 6

[0079]

[0080] Comparative Example 5: Preparation of special fertilizer for walnuts

[0081] This comparative example is in contrast to Example 4, the only difference being that the initial fermentation temperature in step (2) of preparing the walnut fertilizer is changed to 28° C., and the remaining steps are the same. Step (2) is specifically as follows:

[0082] (2) Fermentation treatment: 0.02 kg of Bacillus, 0.01 kg of Aspergillus niger, 0.01 kg of yeast and 5 kg of modified expanded perlite were stirred and mixed evenly, and then fermented for 7 hours at a temperature of 28°C and a humidity of 70%. Subsequently, 25 kg of mixed organic matter and 5 kg of lignin were added and mixed evenly, and then fermented again for 10 days at a temperature of 36°C and a humidity of 70% to obtain biological organic matter.

[0083] Comparative Example 6: Preparation of special fertilizer for walnuts

[0084] This comparative example is in contrast to Example 4, the only difference being that the initial fermentation temperature in step (2) of preparing the walnut fertilizer is changed to 55° C., and the remaining steps are the same. Step (2) is specifically as follows:

[0085] (2) Fermentation treatment: 0.02 kg of Bacillus, 0.01 kg of Aspergillus niger, 0.01 kg of yeast and 5 kg of modified expanded perlite were stirred and mixed evenly, and then fermented for 7 hours at a temperature of 55°C and a humidity of 70%. Subsequently, 25 kg of mixed organic matter and 5 kg of lignin were added and mixed evenly, and then fermented again at a temperature of 36°C and a humidity of 70% for 10 days to obtain biological organic matter.

[0086] Experiment 1: Effect of walnut-specific fertilizer on walnut tree growth characteristics

[0087] 80 well-growing walnut trees were randomly selected from the walnut orchard and divided into 7 experimental groups and 1 control group, with 10 trees in each group:

[0088] Experimental Group 1: The fertilizer used was the walnut-specific fertilizer prepared in Example 4;

[0089] Experimental Group 2: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 1;

[0090] Experimental Group 3: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 2;

[0091] Experimental Group 4: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 3;

[0092] Experimental Group 5: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 4;

[0093] Experimental Group 6: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 5;

[0094] Experimental Group 7: The fertilizer used was the walnut-specific fertilizer prepared in Comparative Example 6;

[0095] Control group: The fertilizer used was a mixture of urea, potassium sulfate and superphosphate, which are commonly used for walnuts, in a mass ratio of 1:0.8:0.8.

[0096] The seven experimental groups and one control group were managed normally. Fertilizer was applied after measuring the ground diameter, crown width, and tree height of the walnut trees in mid-March 2019. The fertilizer was applied every 30 days. The ground diameter, crown width, and tree height of the walnut trees were measured again in mid-March 2020, and the annual growth of the ground diameter, crown width, and tree height was calculated. The results are shown in Table 7:

[0097] Table 7

[0098]

[0099]

[0100] The growth characteristics of walnut trees after treatment in experimental group 1 are as follows Figure 1 shown.

[0101] Experiment 2: Effect of walnut fertilizer on the appearance quality of walnut nuts

[0102] The experimental group 1 and the control group continued to be managed normally, and the fertilizer was applied every 30 days. In early September 2020, the fruits were harvested, peeled, and dried to a constant weight. The longitudinal diameter, transverse diameter, lateral diameter, single fruit weight, and kernel yield of the nuts were measured. The results are shown in Table 8:

[0103] Table 8

[0104] Longitudinal diameter (mm) Horizontal diameter (mm) Side diameter (mm) Single fruit weight (g) Kernel yield (%) Experimental Group 1 46.28 37.16 37.41 18.02 66.94 control group 35.76 31.92 32.10 12.02 51.25

[0105] The appearance of walnut dried fruits in experimental group 1 and control group is as follows Figure 2 shown.

[0106] Result analysis:

[0107] Compare Table 7, Table 8, Figure 1 and Figure 2 Data from experimental group 1 and the control group show that the annual growth, crown width, and tree height of walnut trees after application of the walnut fertilizer prepared by the present invention were greater than those of the control group. The longitudinal, transverse, and lateral diameters of the nuts all increased, the single fruit was heavier, and the kernel yield was higher.

[0108] Comparing the data from Experimental Group 1 and Experimental Groups 2-5 in Table 7 shows that the effectiveness of walnut fertilizer is correlated with the preparation of modified expanded perlite. Omitting the modified expanded perlite during the preparation of walnut fertilizer significantly impacted the annual growth, crown width, and tree height of the walnut trees. Furthermore, omitting calcium carbonate, glucose, and seaweed chitosan during the preparation of the modified expanded perlite also impacted the annual growth, crown width, and tree height of the walnut trees to varying degrees.

[0109] By comparing the data of experimental group 1 and experimental groups 6-7 in Table 7, it can be seen that the temperature of initial fermentation will also affect the growth of walnut trees after the application of walnut-specific fertilizer. When the temperature is too high or too low, the annual growth, crown width and tree height growth of walnut trees will all decrease.

[0110] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalents shall be encompassed by the claims of the present invention. Any techniques, shapes, and structures not described in detail herein are well known.

Claims

1. A method for preparing a special fertilizer for walnuts, characterized in that: The preparation method of the walnut-specific fertilizer is as follows: (1) Pretreatment: Mix soybean meal, sesame cake residue, fulvic acid, humic acid and bone meal evenly, pour them into a grinder and grind them, then place them under ultraviolet light for sterilization to obtain mixed organic matter; (2) Fermentation treatment: Bacillus, Aspergillus niger, yeast and modified expanded perlite are stirred and mixed evenly, and then a preliminary fermentation is carried out; then mixed organic matter and lignin are added and mixed evenly, and fermented again to obtain bio-organic matter; (3) Granulation and packaging: biological organic matter, potassium sulfate, monoammonium phosphate and calcium oxalate are mixed and added into a blender, dried and granulated by a rotating disc, and then transported to an automatic packaging machine for packaging to obtain a walnut fertilizer; The preparation method of the modified expanded perlite is as follows: Potassium dihydrogen phosphate, glucose, calcium carbonate and seaweed chitosan are added to a 1 wt% sodium chloride solution, stirred and reacted at 80-120°C for 10-20 minutes, and then expanded perlite is added. After continuing to stir while cooling to 40°C, the mixture is stirred at a constant temperature for 0.5-1 hour and cooled to room temperature to obtain modified expanded perlite. The mass ratio of the potassium dihydrogen phosphate, glucose, calcium carbonate, seaweed chitin, 1 wt% sodium chloride solution and expanded perlite is (1-2): (3-5): (8-12): (2-4): (200-300): (20-30).

2. The method for preparing a special fertilizer for walnut according to claim 1, wherein The mass ratio of the soybean meal, sesame cake and residue, fulvic acid, humic acid and bone powder is 4:5:1:1:3; the mass ratio of the Bacillus, Aspergillus niger, yeast and modified expanded perlite is 0.02:0.01:0.01:

5.

3. The preparation method of a special fertilizer for walnut according to claim 2, characterized in that, The mass ratio of the biological organic matter, potassium sulfate, monoammonium phosphate and calcium oxalate is 30:0.5:0.5:0.

1.

4. The method for preparing a special fertilizer for walnut according to claim 3, wherein: The conditions for the initial fermentation in step (2) are: temperature 38-42°C, humidity 65%-75%, and time 6-8 hours.

5. The method for preparing a special fertilizer for walnuts according to claim 4, wherein: The conditions for the second fermentation in step (2) are: temperature 35-37°C, humidity 65%-75%, and time 8-12 days.

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