Chelating type water-soluble fertilizer containing humic acid and preparation method of chelating type water-soluble fertilizer

Abstract

The chelating type water-soluble fertilizer containing humic acid is prepared from the following raw materials in parts by weight: 35 to 45 parts of urea, 20 to 25 parts of dipotassium phosphate, 20 to 25 parts of calcium ammonium nitrate, 5 to 10 parts of humic acid, 25 to 30 parts of chitosan aqueous solution, 5 to 8 parts of bentonite-doped synergist, 4 to 7 parts of hydroxyapatite regulator, 2 to 4 parts of boric acid, 3 to 5 parts of compound element agent and 2 to 5 parts of vitamin agent. According to the chelating water-soluble fertilizer, the urea, the dipotassium phosphate, the calcium ammonium nitrate and the humic acid are blended, the boric acid, the compound element agent and the vitamin agent are added for mutual blending and regulation, the synergistic agent doped with bentonite and the hydroxyapatite regulator are adopted for regulation and effect regulation, synergistic interaction is achieved jointly, the effect of improving the plant yield and the quality of the product is remarkable, and the yield of the product is increased. Meanwhile, the product acts on the stability of plants under high and cold conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of water-soluble fertilizers, and in particular to a chelated water-soluble fertilizer containing humic acid and a preparation method thereof. Background Art

[0002] Liquid or solid fertilizers that are dissolved or diluted in water and used for irrigation, foliar fertilization, soilless cultivation, seed soaking and root dipping are called water-soluble fertilizers (water-soluble fertilizers are defined as the NY1429-2007 standard of the Ministry of Agriculture and Rural Affairs, i.e., the standard 3.1 of "Water-soluble Fertilizers Containing Amino Acids"). Generally, all kinds of soluble plant nutrients and plant growth regulators can be used as water-soluble fertilizers.

[0003] Existing water-soluble fertilizers have poor fertilizer efficiency and poor effect on improving plant yield and quality. At the same time, the stability of existing water-soluble fertilizers on plants deteriorates significantly under high-cold conditions, which limits the efficiency of their use. Summary of the invention

[0004] In view of the defects of the prior art, the object of the present invention is to provide a chelated water-soluble fertilizer containing humic acid and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solution: The present invention provides a chelated water-soluble fertilizer containing humic acid, comprising the following raw materials in parts by weight: 35-45 parts of urea, 20-25 parts of dipotassium hydrogen phosphate, 20-25 parts of calcium ammonium nitrate, 5-10 parts of humic acid, 25-30 parts of chitosan aqueous solution, 5-8 parts of synergist doped with bentonite, 4-7 parts of hydroxyapatite regulator, 2-4 parts of boric acid, 3-5 parts of complex element agent, and 2-5 parts of vitamin agent.

[0006] Preferably, the composite element agent is one or more combinations of zinc sulfate, copper sulfate, manganese sulfate, and ammonium molybdate; the vitamin agent is one or more combinations of vitamin C, vitamin B1, vitamin B3, vitamin B6, and vitamin B12.

[0007] Preferably, the mass fraction of the chitosan aqueous solution is 2-5%.

[0008] Preferably, the preparation method of the synergist doped with bentonite is: S1: The bentonite is first heat treated at 210-230℃ for 5-10min, then heated to 350℃ at a rate of 1-3℃ / min, kept at this temperature for 5min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 4-7%; mix bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0009] Preferably, the ball milling speed of the ball milling treatment is 1000-1500 r / min, and the ball milling is for 2 hours.

[0010] Preferably, the preparation method of the synergistic agent is: Add 2-4 parts of lanthanum nitrate solution to 4-7 parts of phosphate buffer solution, then add 2-3 parts of wollastonite and 1-3 parts of talc and mix evenly, finally add 2-4 parts of nano silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0011] Preferably, the pH value of the phosphate buffer solution is 5.0; and the mass fraction of the lanthanum nitrate solution is 2-5%.

[0012] Preferably, the preparation method of the hydroxyapatite regulator is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 3-5 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 2-4 parts of silane coupling agent KH550 and 1-3 parts of urea to 4-7 parts of 5% by mass sodium citrate solution, and then adding 2-4 parts of carboxymethyl cellulose and 0.25-0.35 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0013] Preferably, the stirring and adjusting process has a rotation speed of 450-550 r / min, a stirring time of 30-45 min, and a stirring temperature of 50-55°C.

[0014] The present invention also provides a method for preparing a chelated humic acid-containing water-soluble fertilizer, comprising the following steps: weighing raw materials according to weight portions, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The chelated water-soluble fertilizer of the present invention is prepared by using urea, dipotassium hydrogen phosphate, calcium ammonium nitrate and humic acid, and is mutually adjusted by adding boric acid, a composite element agent and a vitamin agent, and is adjusted by using a synergist doped with bentonite and a hydroxyapatite regulator, so as to achieve a significant improvement in plant yield and quality. At the same time, the stability of the water-soluble fertilizer of the present invention on plants is improved under high-cold conditions; (2) The synergist doped with bentonite in the present invention is firstly heat-treated at 210-230°C for 5-10 minutes, and then heated to 350°C at a rate of 1-3°C / min, and kept warm for 5 minutes. The interlamellar spacing of the bentonite is improved and optimized by adjusting the bentonite. At the same time, sodium lignin sulfonate solution and silane coupling agent KH560 are used to prepare the synergistic improvement, and the bentonite is adjusted and optimized to improve the adsorption and slow-release capacity of the bentonite for water-soluble fertilizers. (3) The present invention uniformly mixes lanthanum nitrate solution, wollastonite and talc and then mixes with nano-silica sol and phosphate buffer solution to obtain a coordinated effect agent through coordination between the raw materials. The coordination between the coordinated effect agents is used to improve the bentonite system. Lanthanum nitrate provides lanthanum elements, which helps to promote the growth and stress resistance of plants. The silicon element in wollastonite helps to enhance the disease resistance of plants and improve the quality of crops. The combination of these two elements can provide comprehensive nutrition for plants and improve the growth environment. (4) Both wollastonite and bentonite can improve the physical properties of the soil and enhance its ability to retain water and fertilizer. The water absorption and swelling properties of bentonite enable it to fix water and nutrients, while talcum powder can improve the fluidity of fertilizers and prevent caking. (5) Nano-silica sol can modify bentonite to improve its water absorption and nutrient release capacity, increase soil permeability and water retention. Phosphate buffer solution can modify the surface of bentonite to increase its surface hydrophilicity and adsorption capacity, thereby improving the nutrient retention capacity and enhancing the overall performance of the fertilizer, making nutrient release more uniform and improving the solubility and absorption efficiency of the fertilizer. (6) The hydroxyapatite regulator is prepared by mixing hydroxyapatite evenly in a 2% potassium permanganate solution with a mass fraction of 3-5 times the total mass of hydroxyapatite to optimize the dispersion and activity of hydroxyapatite. The raw materials in the regulating solution cooperate with each other to coordinate and synergize, thereby enhancing the synergistic effect of the hydroxyapatite regulator and the synergist doped with bentonite, thereby further improving the performance of the water-soluble fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a bar graph of the moisture content of the soil after the water-soluble fertilizer experiment of Examples 1-5 of the present invention; Figure 2 It is a bar graph of the moisture content of the soil after the water-soluble fertilizer experiment using Example 3 and Comparative Examples 1-11 of the present invention; Figure 3 The present invention uses the water-soluble fertilizer of Examples 1-5 to test the nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N), histogram of available phosphorus (AP) content; Figure 4 The present invention uses the water-soluble fertilizer of Example 3 and Comparative Examples 1-11 to test the nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N), histogram of available phosphorus (AP) content; Figure 5 The present invention uses the water-soluble fertilizer of Examples 1-5 to test the nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N), single leaching loss curve of available phosphorus (AP); Figure 6 The present invention uses the water-soluble fertilizer of Example 3 and Comparative Examples 1-11 to test the nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N) and single elution loss curve of available phosphorus (AP). DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1. The humic acid chelated water-soluble fertilizer of this embodiment includes the following raw materials in parts by weight: 35 parts of urea, 20 parts of dipotassium hydrogen phosphate, 20 parts of calcium ammonium nitrate, 5 parts of humic acid, 25 parts of chitosan aqueous solution, 5 parts of synergist doped with bentonite, 4 parts of hydroxyapatite regulator, 2 parts of boric acid, 3 parts of complex element agent, and 2 parts of vitamin agent.

[0020] The composite element agent in this embodiment is zinc sulfate; the vitamin agent is vitamin C.

[0021] The mass fraction of the chitosan aqueous solution in this embodiment is 2%.

[0022] The preparation method of the synergist doped with bentonite in this embodiment is: S1: The bentonite was first heat treated at 210°C for 5 min, then heated to 350°C at a rate of 1°C / min, kept at that temperature for 5 min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 4%; mix the bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0023] The ball milling speed of the ball milling treatment in this embodiment is 1000 r / min, and the ball milling is 2 h.

[0024] The preparation method of the coordination effect agent of this embodiment is: Add 2 parts of lanthanum nitrate solution to 4 parts of phosphate buffer solution, then add 2 parts of wollastonite and 1 part of talc and mix evenly, finally add 2 parts of nano-silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0025] The pH value of the phosphate buffer solution in this embodiment is 5.0; the mass fraction of the lanthanum nitrate solution is 2%.

[0026] The preparation method of the hydroxyapatite regulator of this embodiment is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution with a mass fraction of 3 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 2 parts of silane coupling agent KH550 and 1 part of urea to 4 parts of 5% by mass sodium citrate solution, and then adding 2 parts of carboxymethyl cellulose and 0.25 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0027] The stirring adjustment process in this embodiment has a rotation speed of 450 r / min, a stirring time of 30 min, and a stirring temperature of 50°C.

[0028] The method for preparing a chelated humic acid-containing water-soluble fertilizer of the present embodiment includes the following steps: weighing raw materials according to weight, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0029] Example 2. The humic acid chelated water-soluble fertilizer of this embodiment includes the following raw materials in parts by weight: 45 parts of urea, 25 parts of dipotassium hydrogen phosphate, 25 parts of calcium ammonium nitrate, 10 parts of humic acid, 30 parts of chitosan aqueous solution, 8 parts of synergist doped with bentonite, 7 parts of hydroxyapatite regulator, 4 parts of boric acid, 5 parts of complex element agent, and 5 parts of vitamin agent.

[0030] The composite element agent in this embodiment is copper sulfate; the vitamin agent is vitamin B1.

[0031] The mass fraction of the chitosan aqueous solution in this embodiment is 5%.

[0032] The preparation method of the synergist doped with bentonite in this embodiment is: S1: The bentonite was first heat treated at 230°C for 10 min, then heated to 350°C at a rate of 3°C / min, kept at that temperature for 5 min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 7%; mix bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0033] The ball milling speed of the ball milling treatment in this embodiment is 1500 r / min, and the ball milling is 2 h.

[0034] The preparation method of the coordination effect agent of this embodiment is: Add 4 parts of lanthanum nitrate solution to 7 parts of phosphate buffer solution, then add 3 parts of wollastonite and 3 parts of talc and mix evenly, finally add 4 parts of nano-silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0035] The pH value of the phosphate buffer solution in this embodiment is 5.0; the mass fraction of the lanthanum nitrate solution is 5%.

[0036] The preparation method of the hydroxyapatite regulator of this embodiment is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 5 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 4 parts of silane coupling agent KH550 and 3 parts of urea to 7 parts of 5% by mass sodium citrate solution, and then adding 4 parts of carboxymethyl cellulose and 0.35 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0037] The stirring adjustment process in this embodiment has a rotation speed of 550 r / min, a stirring time of 45 min, and a stirring temperature of 55°C.

[0038] The preparation method of a chelated humic acid-containing water-soluble fertilizer of the present embodiment includes the following steps: weighing raw materials according to weight, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0039] Example 3. The humic acid chelated water-soluble fertilizer of this embodiment includes the following raw materials in parts by weight: 40 parts of urea, 22.5 parts of dipotassium hydrogen phosphate, 22.5 parts of calcium ammonium nitrate, 7.5 parts of humic acid, 27.5 parts of chitosan aqueous solution, 6.5 parts of synergist doped with bentonite, 5.5 parts of hydroxyapatite regulator, 3 parts of boric acid, 4 parts of complex element agent, and 3.5 parts of vitamin agent.

[0040] The composite element agent in this embodiment is manganese sulfate; the vitamin agent is vitamin B12.

[0041] The mass fraction of the chitosan aqueous solution in this embodiment is 3.5%.

[0042] The preparation method of the synergist doped with bentonite in this embodiment is: S1: The bentonite was first heat treated at 220°C for 7.5 min, then heated to 350°C at a rate of 2°C / min, kept at that temperature for 5 min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 5.5%; mix the bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0043] The ball milling speed of the ball milling treatment in this embodiment is 1250 r / min, and the ball milling is performed for 2 h.

[0044] The preparation method of the coordination effect agent of this embodiment is: Add 3 parts of lanthanum nitrate solution to 5.5 parts of phosphate buffer solution, then add 2.5 parts of wollastonite and 2 parts of talc and mix evenly, finally add 3 parts of nano-silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0045] The pH value of the phosphate buffer solution in this embodiment is 5.0; the mass fraction of the lanthanum nitrate solution is 3.5%.

[0046] The preparation method of the hydroxyapatite regulator of this embodiment is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 4 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 3 parts of silane coupling agent KH550 and 2 parts of urea to 5.5 parts of 5% sodium citrate solution, and then adding 3 parts of carboxymethyl cellulose and 0.30 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0047] The stirring adjustment process of this embodiment has a rotation speed of 500 r / min, a stirring time of 40 min, and a stirring temperature of 52°C.

[0048] The preparation method of a chelated humic acid-containing water-soluble fertilizer of the present embodiment includes the following steps: weighing raw materials according to weight, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0049] Example 4. The humic acid chelated water-soluble fertilizer of this embodiment includes the following raw materials in parts by weight: 37 parts of urea, 22 parts of dipotassium hydrogen phosphate, 23 parts of calcium ammonium nitrate, 6 parts of humic acid, 26 parts of chitosan aqueous solution, 6 parts of synergist doped with bentonite, 5 parts of hydroxyapatite regulator, 3 parts of boric acid, 4 parts of complex element agent, and 3 parts of vitamin agent.

[0050] The composite element agent in this embodiment is ammonium molybdate; the vitamin agent is vitamin C.

[0051] The mass fraction of the chitosan aqueous solution in this embodiment is 3%.

[0052] The preparation method of the synergist doped with bentonite in this embodiment is: S1: The bentonite was first heat treated at 215°C for 6 min, then heated to 350°C at a rate of 2°C / min, kept at this temperature for 5 min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 5%; mix the bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0053] The ball milling speed of the ball milling treatment in this embodiment is 1200 r / min, and the ball milling is 2 h.

[0054] The preparation method of the coordination effect agent of this embodiment is: Add 3 parts of lanthanum nitrate solution to 5 parts of phosphate buffer solution, then add 2.2 parts of wollastonite and 2 parts of talc and mix evenly, finally add 3 parts of nano-silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0055] The pH value of the phosphate buffer solution in this embodiment is 5.0; the mass fraction of the lanthanum nitrate solution is 3%.

[0056] The preparation method of the hydroxyapatite regulator of this embodiment is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 4 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 3 parts of silane coupling agent KH550 and 2 parts of urea to 6 parts of 5% by mass sodium citrate solution, and then adding 3 parts of carboxymethyl cellulose and 0.32 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0057] The stirring adjustment process in this embodiment has a rotation speed of 530 r / min, a stirring time of 42 min, and a stirring temperature of 54°C.

[0058] The method for preparing a chelated humic acid-containing water-soluble fertilizer of the present embodiment includes the following steps: weighing raw materials according to weight, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0059] Example 5. The humic acid chelated water-soluble fertilizer of this embodiment includes the following raw materials in parts by weight: 42 parts of urea, 22 parts of dipotassium hydrogen phosphate, 23 parts of calcium ammonium nitrate, 8 parts of humic acid, 28 parts of chitosan aqueous solution, 7 parts of synergist doped with bentonite, 6 parts of hydroxyapatite regulator, 3 parts of boric acid, 4 parts of complex element agent, and 3 parts of vitamin agent.

[0060] The composite element agent in this embodiment is ammonium molybdate; the vitamin agent is vitamin C.

[0061] The mass fraction of the chitosan aqueous solution in this embodiment is 4%.

[0062] The preparation method of the synergist doped with bentonite in this embodiment is: S1: The bentonite was first heat treated at 225°C for 8 min, then heated to 350°C at a rate of 2°C / min, kept at that temperature for 5 min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 6%; mix the bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

[0063] The ball milling speed of the ball milling treatment in this embodiment is 1250 r / min, and the ball milling is performed for 2 h.

[0064] The preparation method of the coordination effect agent of this embodiment is: Add 3 parts of lanthanum nitrate solution to 6 parts of phosphate buffer solution, then add 3 parts of wollastonite and 2 parts of talc and mix evenly, finally add 3 parts of nano-silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

[0065] The pH value of the phosphate buffer solution in this embodiment is 5.0; the mass fraction of the lanthanum nitrate solution is 4%.

[0066] The preparation method of the hydroxyapatite regulator of this embodiment is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 4 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 3 parts of silane coupling agent KH550 and 2 parts of urea to 6 parts of 5% by mass sodium citrate solution, and then adding 3 parts of carboxymethyl cellulose and 0.32 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

[0067] The stirring adjustment process in this embodiment has a rotation speed of 520 r / min, a stirring time of 42 min, and a stirring temperature of 54°C.

[0068] The preparation method of a chelated humic acid-containing water-soluble fertilizer of the present embodiment includes the following steps: weighing raw materials according to weight, and then mixing the raw materials to obtain the chelated humic acid-containing water-soluble fertilizer.

[0069] Comparative Example 1 The difference from Example 3 is that no synergist doped with bentonite is added.

[0070] Comparative Example 2 The difference from Example 3 is that no synergist doped with bentonite is added and the step S1 is not processed.

[0071] Comparative Example 3 The difference from Example 3 is that the coordination agent does not use nano silica sol.

[0072] Comparative Example 4 The difference from Example 3 is that the bentonite agent in step S2 does not contain sodium lignin sulfonate solution and silane coupling agent KH560.

[0073] Comparative Example 5 The difference from Example 3 is that in the preparation of the bentonite-doped synergist, the bentonite agent is not added with the bentonite cooled to room temperature.

[0074] Comparative Example 6 The difference from Example 3 is that no synergist treatment is used in the preparation of the synergist doped with bentonite.

[0075] Comparative Example 7 The difference from Example 3 is that wollastonite and talc were not added in the coordination agent treatment.

[0076] Comparative Example 8 The difference from Example 3 is that no hydroxyapatite regulator is added.

[0077] Comparative Example 9 The difference from Example 3 is that no conditioning liquid treatment is used in the preparation of the hydroxyapatite conditioning agent.

[0078] Comparative Example 10 The difference from Example 3 is that potassium permanganate is not added to the hydroxyapatite in step S11.

[0079] Comparative Example 11 The difference from Example 3 is that the silane coupling agent KH550 is not added to the regulating solution in step S12.

[0080] Effect Experiment 1.1 Test soil The test soil was taken from the soil of the outer 30 cm layer of Dongxia Industrial Park, Qingzhou City, Weifang City, Shandong Province and mixed evenly. The basic physical and chemical properties of the test soil are shown in Table 1.

[0081] Table 1

[0082] The basic physical and chemical properties of the bentonite used are shown in Table 2.

[0083] Table 2

[0084] 1.2 Experimental design The test soil was naturally air-dried, ground and sieved through a 2 mm sieve and then divided into 48 portions on average. Three repeated experiments were performed on the samples of humic acid chelated water-soluble fertilizer prepared in Examples 1-5 and Comparative Examples 1-11. Each group of samples was added to the test soil and stirred evenly. The samples were naturally air-dried in a dark place, and the average value of the results of each group of Examples and Comparative Examples was taken.

[0085] Design of leaching test Each group of sample soil was added to an acrylic transparent tube with an inner diameter of 5 cm and a height of 35 cm. Multiple 1 mm small holes were opened at the bottom, and a 100 mL triangular flask was placed under the soil column to collect the leaching solution. Before filling the soil, a filter device was laid at the bottom in the order of nylon mesh (300 mesh), quartz sand (6-8 mesh, thickness 3 cm), and nylon mesh (300 mesh). After the soil was filled, the soil at the edge was compacted. In order to evenly distribute water, 2 layers of nylon mesh (300 mesh) were laid on the soil surface, and 3 mm thick quartz sand was filled on the top to reduce the disturbance of water flow to the soil surface.

[0086] Intermittent leaching was adopted, with an interval of 7 days, and a total of 8 leachings were carried out. Water was added for the first time until the soil moisture content of the soil column reached the critical saturated moisture content. Referring to the single rainfall in Qingzhou City from June to September, the single precipitation of a single soil column was converted to 46mL of deionized water. The dosage was based on the field dosage, and 155mL of water was added for the first time, and deionized water was used. After stabilization for 24 hours, the leaching test was carried out. After that, 46mL of deionized water was injected each time the leaching was carried out, and the leachate was collected, and then the leaching test was carried out every 7 days.

[0087] 1.3 Experimental determination The experimental period was 2 months, and soil samples from 0 to 30 cm were collected using a 5 cm soil drill for soil physical and chemical analysis.

[0088] The soil moisture content is measured by drying method, and the test results are as follows Figure 1 , Figure 2The pH value was determined by pH meter method (soil-water ratio 1:2.5), the cation exchange capacity (CEC) was determined by sodium acetate-flame photometer method, and the soil organic carbon (SOC) was determined by potassium dichromate heating method. The test results are shown in Table 3. Nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N), available phosphorus (AP) were determined by flow analyzer, and available potassium (AK) was determined by flame photometer. The test results are as follows Figure 3 , Figure 4 .

[0089] After each leaching, the collected leaching solution was filtered and tested for nitrate nitrogen (NO3 - -N), ammonium nitrogen (NH4 + -N), available phosphorus (AP), available potassium (AK), leaching loss (mg / m 2 ) = [ammonium nitrogen concentration of each elution solution (mg / L) * volume of each elution solution (L)] / area of ​​acrylic transparent tube (m 2 ), the measurement results are as follows Figure 5 , Figure 6 .

[0090] Table 3

[0091] The products of Examples 1-5 and Comparative Examples 1-11 of the present invention were routinely tested. At the same time, saline-alkali soil with a salt content of 0.30% was selected and the test area was a high-cold area of ​​-10°C. The performance test results are shown in Table 4.

[0092] Table 4

[0093] From Table 3, Figure 1-Figure 6 It can be concluded that the raw materials in the water-soluble fertilizer prepared by the present invention cooperate with each other and work together to improve the physical properties of the soil, enhance the water and fertilizer retention capacity, provide comprehensive nutrition for plants, and improve the growth environment.

[0094] It can be concluded from Table 4 that the products of Examples 1-5 of the present invention have excellent rice yield and nitrogen absorption rate, and the salt resistance and low temperature stability of the products are remarkable. The products do not add a synergist of doped bentonite or a hydroxyapatite regulator, and the performance of the products deteriorates significantly, especially the low temperature stability, which deteriorates more significantly. The synergistic combination of the two is used to achieve the most remarkable performance effect of the products.

[0095] In the preparation of the synergist doped with bentonite, the bentonite agent was not added with bentonite that was air-cooled to room temperature, the synergist treatment was not used in the preparation of the synergist doped with bentonite, wollastonite, talc, and nano-silica sol were not added in the synergist treatment, the hydroxyapatite was not treated with potassium permanganate, the conditioning liquid treatment was not used in the preparation of the hydroxyapatite conditioning agent, and the silane coupling agent KH550, urea, and other treatment methods were not added to the conditioning liquid. The performance of the products all tended to deteriorate. Only the product raw material obtained by the method of the present invention had the most significant product performance effect, and other methods were not as obvious as the effect of the present invention.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0097] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A chelated humic acid-containing water-soluble fertilizer, characterized in that: It includes the following raw materials in parts by weight: 35-45 parts of urea, 20-25 parts of dipotassium hydrogen phosphate, 20-25 parts of calcium ammonium nitrate, 5-10 parts of humic acid, 25-30 parts of chitosan aqueous solution, 5-8 parts of synergist doped with bentonite, 4-7 parts of hydroxyapatite regulator, 2-4 parts of boric acid, 3-5 parts of complex element agent, and 2-5 parts of vitamin agent.

2. The humic acid chelated water-soluble fertilizer according to claim 1, characterized in that: The composite element agent is one or more combinations of zinc sulfate, copper sulfate, manganese sulfate, and ammonium molybdate; the vitamin agent is one or more combinations of vitamin C, vitamin B1, vitamin B3, vitamin B6, and vitamin B12.

3. The humic acid chelated water-soluble fertilizer according to claim 1, characterized in that: The mass fraction of the chitosan aqueous solution is 2-5%.

4. The humic acid chelated water-soluble fertilizer according to claim 1, characterized in that: The preparation method of the synergist doped with bentonite is: S1: The bentonite is first heat treated at 210-230℃ for 5-10min, then heated to 350℃ at a rate of 1-3℃ / min, kept at this temperature for 5min, and finally air-cooled to room temperature; S2: Mix sodium lignin sulfonate and deionized water to prepare a sodium lignin sulfonate solution with a mass fraction of 4-7%; mix bentonite cooled to room temperature, the sodium lignin sulfonate solution and the silane coupling agent KH560 in a weight ratio of 2:5:1 to obtain a bentonite agent; S3: Mix the bentonite agent and the synergist in a weight ratio of 5:3 and perform ball milling. After the ball milling is completed, wash with water and dry to obtain a synergist doped with bentonite.

5. The humic acid chelated water-soluble fertilizer according to claim 4, characterized in that: The ball milling process is performed at a ball milling speed of 1000-1500 r / min for 2 hours.

6. The humic acid chelated water-soluble fertilizer according to claim 4, characterized in that: The preparation method of the coordination effect agent is: Add 2-4 parts of lanthanum nitrate solution to 4-7 parts of phosphate buffer solution, then add 2-3 parts of wollastonite and 1-3 parts of talc and mix evenly, finally add 2-4 parts of nano silica sol and continue to stir thoroughly, finally wash with water and dry to obtain a coordination agent.

7. The humic acid chelated water-soluble fertilizer according to claim 6, characterized in that: The pH value of the phosphate buffer solution is 5.0; the mass fraction of the lanthanum nitrate solution is 2-5%.

8. The humic acid chelated water-soluble fertilizer according to claim 1, characterized in that: The preparation method of the hydroxyapatite regulator is: S11: the hydroxyapatite is firstly stirred evenly in a 2% potassium permanganate solution having a mass fraction of 3-5 times the total amount of the hydroxyapatite, and then washed with water and dried to obtain dry hydroxyapatite; S12: adding 2-4 parts of silane coupling agent KH550 and 1-3 parts of urea to 4-7 parts of 5% by mass sodium citrate solution, and then adding 2-4 parts of carboxymethyl cellulose and 0.25-0.35 parts of sodium dodecylbenzene sulfonate to fully mix to obtain a regulating solution; S13: The dried hydroxyapatite and the conditioning liquid are stirred and conditioned in a weight ratio of 2:

5. After the stirring is completed, the mixture is washed with water and dried to obtain a hydroxyapatite conditioning agent.

9. The humic acid chelated water-soluble fertilizer according to claim 8, characterized in that: The stirring adjustment process has a rotation speed of 450-550 r / min, a stirring time of 30-45 min, and a stirring temperature of 50-55° C.

10. A method for preparing the humic acid chelated water-soluble fertilizer according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: weighing raw materials according to weight proportions, and then mixing the raw materials to obtain a chelated humic acid-containing water-soluble fertilizer.

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