Fertilizer synergist, synergistic fertilizer and preparation method thereof

Abstract

The invention relates to a fertilizer synergist, a synergistic fertilizer and a preparation method thereof, and is characterized in that the synergist contains polypeptide, urea and chitosan oligosaccharide. The composition has an obvious synergistic effect on the fertilizer, and the yield of the fertilizer can be obviously improved.

Description

Technical Field

[0001] The invention relates to a fertilizer synergist, a synergistic fertilizer and a preparation method thereof. Background Art

[0002] As a fertilizer synergist, polypeptides can significantly improve the utilization rate of fertilizers, enhance crop resistance, and promote crop development. Its main product, polypeptide urea, was launched in 2007 and was widely recognized at the time. However, after more than 10 years of promotion, crops have adapted to it, and its effect in promoting crop growth is no longer as obvious as before. However, it contains a large number of carboxyl groups and has a strong chelating effect, which can improve the utilization rate of fertilizers. This has not disappeared. Therefore, it still has use value as a fertilizer synergist and should be taken seriously.

[0003] Currently, there are no products or methods for enhancing the effect of peptide synergists on crop development. Summary of the Invention

[0004] The present invention provides a fertilizer synergist, a synergistic fertilizer and a preparation method thereof, and solves the technical problem of improving the effect of polypeptide synergists in promoting crop development.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A fertilizer synergist containing polypeptide, urea and chitosan oligosaccharide;

[0007] The mass ratio of the polypeptide to urea is 4-40:0.5-10; the mass ratio of the polypeptide to chitosan oligosaccharide is 5-10:1.

[0008] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0009] Add the polypeptide and urea to water and dissolve them, stirring for 20 to 180 minutes to obtain a polypeptide-urea solution; or

[0010] Add urea to the polypeptide solution and dissolve it, stirring for 20 to 180 minutes to obtain a polypeptide-urea solution;

[0011] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0012] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0013] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0014] The stirring temperature is 20 to 40°C;

[0015] The moisture content of fertilizer synergist powder is ≤4%;

[0016] The mass ratio of polypeptide, urea and water is 4-40:1:59-95.

[0017] The preparation method of the fertilizer synergist also includes adjusting the pH to 5.0-6.5.

[0018] Synergistic fertilizers containing fertilizer synergists, containing fertilizer synergists.

[0019] A method for preparing a synergistic fertilizer containing a fertilizer synergist,

[0020] The fertilizer synergist, fertilizer raw materials and auxiliary materials are mixed evenly to obtain a synergistic fertilizer containing the fertilizer synergist;

[0021] The mass ratio of the fertilizer synergist, the fertilizer raw material and the auxiliary material is 2-10:500-980:0-400;

[0022] The fertilizer raw materials include one or more of urea, monoammonium phosphate, potassium sulfate, potassium chloride, ammonium chloride, ammonium sulfate and potassium nitrate;

[0023] The auxiliary material is one or more of bentonite, attapulgite, humic acid and talc.

[0024] It also includes granulation, drying and cooling.

[0025] The invention has the following beneficial technical effects:

[0026] 1. The present application combines polypeptide, urea and chitosan oligosaccharide to further enhance the effect of polypeptide in promoting crop growth.

[0027] 2. The purpose of limiting the mass ratio of polypeptide to chitosan oligosaccharide in this application is to ensure the effect of the product. The reason is that when the amount of chitosan oligosaccharide added is too small, it will not have a good effect, and when the amount of chitosan oligosaccharide added is too large, it will also affect the effect of the product.

[0028] 3. The present application obtains a polypeptide-urea solution by first adding the polypeptide and urea to water to dissolve or adding urea to the polypeptide solution to dissolve; and then adding chitosan oligosaccharide, thereby better enhancing the effect of the polypeptide in promoting crop development.

[0029] 4. The present application limits the temperature for preparing the fertilizer synergist, thereby preventing the Maillard reaction of the polypeptide and the chitosan oligosaccharide. DETAILED DESCRIPTION

[0030] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below with reference to preferred examples.

[0031] Example 1

[0032] A fertilizer synergist is prepared from polypeptide, urea and chitosan oligosaccharide in a mass ratio of 20:5:4.

[0033] The pH is 6.2.

[0034] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0035] Add urea to the polypeptide solution and dissolve it, stirring for 30 minutes to obtain a polypeptide-urea solution;

[0036] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0037] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0038] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0039] The stirring temperature is 25°C;

[0040] The moisture content of the fertilizer synergist powder is ≤4%.

[0041] The synergistic fertilizer containing a fertilizer synergist consists of urea, ammonium sulfate, monoammonium phosphate, potassium sulfate, potassium chloride, bentonite and a fertilizer synergist.

[0042] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0043] 150 parts of urea, 320 parts of ammonium sulfate, 280 parts of monoammonium phosphate, 120 parts of potassium sulfate, 50 parts of potassium chloride and 80 parts of bentonite are mixed, and the mixture is conveyed to a granulation drum via a conveyor belt. 3 parts of a fertilizer synergist aqueous solution is sprayed into the inlet end of the granulation drum to mix the urea, ammonium sulfate, monoammonium phosphate, potassium sulfate, potassium chloride, bentonite and the fertilizer synergist aqueous solution. After drum granulation, drying, cooling and screening, a synergistic compound fertilizer containing a fertilizer synergist is obtained.

[0044] The polypeptide liquid is polyaspartic acid liquid with a solid content of 20% and a pH of 9.8 (1% aqueous solution).

[0045] Example 2

[0046] A fertilizer synergist is prepared from polypeptide, urea and chitosan oligosaccharide in a mass ratio of 20:5:4.

[0047] The pH is 6.2.

[0048] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0049] Add urea to the polypeptide solution and dissolve it, stir for 30 minutes to obtain polypeptide-urea solution;

[0050] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0051] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0052] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0053] The stirring temperature is 25°C;

[0054] The moisture content of the fertilizer synergist powder is ≤4%.

[0055] The synergistic fertilizer containing a fertilizer synergist consists of urea, ammonium sulfate, monoammonium phosphate, potassium sulfate, potassium chloride, bentonite and a fertilizer synergist.

[0056] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0057] 150 parts of urea, 320 parts of ammonium sulfate, 280 parts of monoammonium phosphate, 120 parts of potassium sulfate, 50 parts of potassium chloride and 80 parts of bentonite are mixed, and the mixture is conveyed to a granulation drum via a conveyor belt. 3 parts of a fertilizer synergist aqueous solution is sprayed into the inlet end of the granulation drum to mix the urea, ammonium sulfate, monoammonium phosphate, potassium sulfate, potassium chloride, bentonite and the fertilizer synergist aqueous solution. After drum granulation, drying, cooling and screening, a synergistic compound fertilizer containing a fertilizer synergist is obtained.

[0058] The polypeptide solution is polyglutamic acid solution with a solid content of 20% and a pH of 9.7 (1% aqueous solution).

[0059] Example 3

[0060] A fertilizer synergist is prepared from polypeptide, urea and chitosan oligosaccharide in a mass ratio of 20:5:4.

[0061] The pH is 6.2.

[0062] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0063] Add the polypeptide and urea into water and dissolve them, stirring for 30 minutes to obtain a polypeptide-urea solution;

[0064] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0065] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0066] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0067] The stirring temperature is 25°C;

[0068] The moisture content of fertilizer synergist powder is ≤4%;

[0069] The mass ratio of polypeptide, urea and water is 20:5:75.

[0070] The synergistic fertilizer containing a fertilizer synergist consists of 150 parts of urea, 320 parts of ammonium sulfate, 280 parts of monoammonium phosphate, 120 parts of potassium sulfate, 50 parts of potassium chloride, 80 parts of bentonite and 1 part of fertilizer synergist powder.

[0071] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0072] Urea, ammonium sulfate, monoammonium phosphate, potassium sulfate, potassium chloride, bentonite and fertilizer synergist powder are mixed, drum granulated, dried, cooled and sieved to obtain a synergistic compound fertilizer containing the fertilizer synergist;

[0073] The polypeptide is polyglutamic acid powder, the pH of which is 9.7 (1% aqueous solution)

[0074] Example 4

[0075] A fertilizer synergist is prepared from polypeptide, urea and chitosan oligosaccharide in a mass ratio of 25:2:5.

[0076] The pH is 6.3.

[0077] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0078] Add the polypeptide and urea into water and dissolve them, stirring for 60 minutes to obtain a polypeptide-urea solution;

[0079] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0080] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0081] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0082] The stirring temperature is 27°C;

[0083] The moisture content of fertilizer synergist powder is ≤4%;

[0084] The mass ratio of polypeptide, urea and water is 25:2:73.

[0085] The synergistic fertilizer containing a fertilizer synergist consists of 160 parts of urea, 220 parts of ammonium chloride, 300 parts of monoammonium phosphate, 200 parts of potassium chloride, 120 parts of bentonite and 1 part of fertilizer synergist powder.

[0086] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0087] Urea, ammonium chloride, monoammonium phosphate, potassium chloride, bentonite and fertilizer synergist powder are mixed, and the mixture is subjected to drum granulation, drying, cooling and screening to obtain a synergistic compound fertilizer containing the fertilizer synergist;

[0088] The polypeptide is polyglutamic acid powder, the pH of which is 9.5 (1% aqueous solution)

[0089] Example 5

[0090] A fertilizer synergist is prepared from polypeptide, urea and chitosan oligosaccharide in a mass ratio of 22:3:4.

[0091] The pH is 6.3.

[0092] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0093] Add the polypeptide and urea into water and dissolve them, stirring for 60 minutes to obtain a polypeptide-urea solution;

[0094] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0095] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0096] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0097] The stirring temperature is 27°C;

[0098] The moisture content of fertilizer synergist powder is ≤4%;

[0099] The mass ratio of polypeptide, urea and water is 22:3:75.

[0100] The synergistic fertilizer containing a fertilizer synergist consists of 120 parts of urea, 300 parts of ammonium sulfate, 480 parts of potassium dihydrogen phosphate, 100 parts of potassium sulfate and 1 part of fertilizer synergist powder.

[0101] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0102] Mix urea, ammonium sulfate, potassium dihydrogen phosphate, potassium sulfate and fertilizer synergist powder to obtain a synergistic water-soluble fertilizer;

[0103] The polypeptide is polyglutamic acid powder, the pH of which is 9.5 (1% aqueous solution)

[0104] Example 6

[0105] A fertilizer synergist is composed of polypeptide, urea and chitosan oligosaccharide in a mass ratio of 40:8:7.

[0106] The pH is 6.2.

[0107] The preparation method of the fertilizer synergist is carried out according to the following steps:

[0108] Add urea to the polypeptide solution and dissolve it, stirring for 50 minutes to obtain a polypeptide-urea solution;

[0109] Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution;

[0110] The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder;

[0111] The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder;

[0112] The stirring temperature is 20°C;

[0113] The moisture content of the fertilizer synergist powder is ≤4%.

[0114] The synergistic fertilizer containing a fertilizer synergist consists of 50 parts of urea, 14 parts of ammonium dihydrogen phosphate, 16 parts of potassium nitrate, 5 parts of potassium fulvic acid and 100 parts of a fertilizer synergist aqueous solution.

[0115] A method for preparing a synergistic fertilizer containing a fertilizer synergist, characterized in that:

[0116] Adding urea, ammonium dihydrogen phosphate, potassium nitrate and potassium fulvic acid into a fertilizer synergist aqueous solution and dissolving the solution to obtain a synergistic water-soluble fertilizer containing the fertilizer synergist;

[0117] The polypeptide solution is polyaspartic acid solution with a solid content of 40% and a pH of 9.8 (1% aqueous solution).

[0118] Polyaspartic acid was purchased from Beijing Tianyin Aishihua Technology Co., Ltd., and polyglutamic acid was purchased from Yantai Hongyuan Biofertilizer Co., Ltd.

[0119] The beneficial effects of the present invention are further illustrated below in conjunction with test data:

[0120] Experiment 1

[0121] 1.1 Experimental location: Gansu Smart Agriculture Engineering Technology Research Center.

[0122] 1.2 Experimental testing: observe the phenomenon.

[0123] 1.3 Test materials: Comparison 1 (polyaspartic acid liquid solid content 20%), Comparison 2 (chitosan oligosaccharide), Comparison 3 (except for not containing chitosan oligosaccharide, the others are the same as in Example 1), Comparison 4 (except for not containing polypeptide, chitosan oligosaccharide and urea are mixed to obtain a fertilizer synergist powder, the others are the same as in Example 1), Comparison 5 (except that urea and chitosan oligosaccharide are mixed and then added to the polypeptide liquid, the others are the same as in Example 1), Comparison 6 (except that chitosan oligosaccharide is added to the polypeptide liquid and then urea is added, the others are the same as in Example 1), Comparison 7 (except that polypeptide, urea and chitosan oligosaccharide are in a mass ratio of 20:5:5, the others are the same as in Example 1) and the fertilizer synergists prepared in Examples 1 to 3.

[0124] 1.4 Detection method: Comparative Examples 2 (chitosan oligosaccharide) and Comparative Examples 4 (all the same as Example 1 except that they do not contain polypeptide) were added with 4 times the amount of water as that of chitosan oligosaccharide, stirred for 30 minutes, and the dilutions were obtained and observed; the other comparative examples and examples were all in liquid form and could be directly observed.

[0125] Except for the different treatments in this experiment, the other treatments were the same.

[0126] 2 Results and Analysis

[0127] See Table 1 for the phenomenon

[0128] Table 1

[0129] Phenomenon Comparison 1 Amber transparent liquid, no sediment at the bottom Comparison 2 Light yellow transparent liquid, no precipitation at the bottom Contrast 3 Amber transparent liquid, no sediment at the bottom Contrast 4 Light yellow transparent liquid, no precipitation at the bottom Contrast 5 Light yellow transparent liquid with sediment at the bottom Contrast 6 Light yellow transparent liquid with sediment at the bottom Contrast 7 Light yellow transparent liquid with sediment at the bottom Example 1 Amber transparent liquid, no sediment at the bottom Example 2 Amber transparent liquid, no sediment at the bottom Example 3 Amber transparent liquid, no sediment at the bottom

[0130] As can be seen from the phenomenon in Table 1, polyaspartic acid, polyaspartic acid and urea, chitosan oligosaccharide, chitosan oligosaccharide and urea are all water-soluble, while Comparative 5 (except that urea and chitosan oligosaccharide are mixed and then added to the polypeptide solution, the rest are consistent with Example 1) and Comparative 6 (except that polypeptide, urea and chitosan oligosaccharide are mixed in a mass ratio of 20:5:4 and then urea is added, the rest are consistent with Example 1) have precipitation, which affects the water solubility. The reason may be that NH3 + The -C00 on the polypeptide is positively charged, and the -C00 on the polypeptide is negatively charged, and precipitation occurs due to electrostatic interaction.

[0131] Comparative Example 7 (except that the mass ratio of polypeptide, urea and chitosan oligosaccharide is 20:5:5, all others are consistent with Example 1) produces precipitation. It may be that when the concentration of chitosan oligosaccharide is high, the amino groups on the chitosan oligosaccharide compete with the amino groups in urea, so that some chitosan oligosaccharides and polypeptides undergo electrostatic interaction, resulting in precipitation.

[0132] In Examples 1, 2, 3 and 4, the polypeptide was first prepared with urea to form a polypeptide-urea solution, which was then mixed with chitosan oligosaccharide. It may be that the amino groups in the urea first combined with the carboxyl groups in the polypeptide, thereby reducing the binding of the amino groups in the chitosan oligosaccharide with the carboxyl groups in the polypeptide, and therefore no precipitation was produced.

[0133] Experiment 2

[0134] 1.1 Experimental location: Wuqi Village, Gucheng Town, Liangzhou District, Wuwei City, solar greenhouse; planted crop: Chinese cabbage, variety: Lanfei.

[0135] 1.2 Experimental testing: plant height (cm), SPAD value, leaf area (cm 2 ) and yield (kg / mu).

[0136] 1.3 Test materials: Comparison 1 (polyaspartic acid solution, solid content 20%), Comparison 2 (chitosan oligosaccharide), Comparison 3 (except not containing chitosan oligosaccharide, the others are consistent with Example 1), Comparison 4 (except not containing polypeptide, chitosan oligosaccharide and urea are mixed to obtain fertilizer synergist powder, the others are consistent with Example 3), Comparison 5 (except that urea and chitosan oligosaccharide are mixed and then added to the polypeptide solution, the others are consistent with Example 1), Comparison 6 (except that chitosan oligosaccharide is added to the polypeptide solution and then urea is added, the others are consistent with Example 1), Comparison 7 (except that polypeptide, urea and chitosan oligosaccharide are in a mass ratio of 20:5:5, the others are consistent with Example 1) and synergistic fertilizers prepared in Examples 1 to 3;

[0137] Among them, after drying, comparison 5, comparison 6 and comparison 7, a fertilizer synergist powder was obtained, and then a synergistic compound fertilizer was prepared according to the preparation method of the synergistic fertilizer containing the fertilizer synergist in Example 3; comparison 2 and comparison 4 were prepared into synergistic compound fertilizers according to the preparation method of Example 3.

[0138] 1.4 Experimental method: Take 2 mu of greenhouse and divide it into 10 experimental plots. Experimental treatments correspond randomly. Each plot is 100 square meters. The greenhouse is a north-south greenhouse. Excluding the 2-meter position close to the wall, each treatment corresponds randomly to each plot. Base application is used with a base application depth of 12 cm ± 1 cm. 10 kg of synergistic compound fertilizer is applied in each plot.

[0139] 1.5 Detection method: Plant height is measured with a ruler; SPAD value is measured with a SPAD meter; leaf area is measured by leaf length and leaf width, and the calculation formula is leaf length * leaf width * 0.7; yield is measured by weighing method; plant height, SPAD and leaf area are tested 30 days after transplanting; choose plants of the same size when transplanting.

[0140] Except for the different treatments in this experiment, the other treatments were the same.

[0141] 2 Results and Analysis

[0142] Plant height (cm), SPAD value, leaf area (cm 2 ) and yield (kg / mu), take the average value, see Table 2

[0143] Table 2

[0144] Plant height (cm) SPAD <![CDATA[Leaf area (cm 2 )]]> Yield (kg / mu) Comparison 1 15.25 34.87 58.76 1852.4 Comparison 2 15.53 34.13 60.25 1839.6 Contrast 3 15.37 35.36 59.25 1866.2 Contrast 4 15.59 34.78 61.35 1847.7 Contrast 5 15.92 36.67 63.24 1943.2 Contrast 6 15.68 35.71 62.55 1915.5 Contrast 7 16.29 37.64 66.27 1968.3 Example 1 16.82 38.41 68.31 1993.5 Example 2 17.15 39.25 69.44 2001.4 Example 3 17.21 39.92 70.82 2009.9

[0145] From the comparison between comparison 1 and comparison 2, and comparison 3 and comparison 4 in Table 2, it can be seen that comparison 2 and comparison 4 have advantages in promoting crop growth including plant height and leaf area, but do not have an advantage in chlorophyll SPAD. It may be that the polypeptide improves the fertilizer utilization rate, resulting in the SPAD of comparison 1 and comparison 3 being higher than that of comparison 2 and comparison 4. It can be seen that chitosan oligosaccharide and polypeptide have their own advantages and disadvantages in the performance of crop growth, but the difference is not large.

[0146] It can be seen from Comparison 3, Comparison 4, Comparison 5, Comparison 6 and Comparison 7 in Table 2 that the combination of polypeptide and chitosan oligosaccharide can further promote the growth of crops and increase the yield of crops.

[0147] From the comparison of the data of Comparison 7 and Example 1 in Table 2, it can be seen that the amount of chitosan oligosaccharide added also affects the effect of the product, and the more the better is not necessarily true.

[0148] From the comparison of the data of Comparison 5, Comparison 6 and Example 1 in Table 2, it can be seen that the order of adding chitosan oligosaccharide and urea to the polypeptide also affects the effect of the product.

Claims

1. A fertilizer synergist, characterized in that Contains peptides, urea and chitosan oligosaccharides; The mass ratio of the polypeptide to urea is 4-40:0.5-10; the mass ratio of the polypeptide to chitosan oligosaccharide is 5-10:

1.

2. The method for preparing the fertilizer synergist according to claim 1, wherein Follow these steps: Add the polypeptide and urea into water, dissolve them, and stir to obtain a polypeptide-urea solution; or Add urea to the polypeptide solution and dissolve it, stirring to obtain a polypeptide-urea solution; Adding chitosan oligosaccharide into the polypeptide-urea solution and dissolving it to obtain a fertilizer synergist aqueous solution; The fertilizer synergist aqueous solution is spray-dried to obtain the fertilizer synergist powder; The fertilizer synergist includes a fertilizer synergist aqueous solution and a fertilizer synergist powder; The moisture content of fertilizer synergist powder is ≤4%; The mass ratio of polypeptide, urea and water is 4-40:1:59-95.

3. The method for preparing the fertilizer synergist according to claim 2, wherein The stirring time is 20 to 180 minutes and the temperature is 20 to 40°C.

4. The synergistic fertilizer containing a fertilizer synergist according to any one of claims 1 to 3, characterized in that: Contains fertilizer synergist.

5. The method for preparing a synergistic fertilizer containing a fertilizer synergist according to any one of claims 1 to 4, characterized in that: The fertilizer synergist, fertilizer raw materials and auxiliary materials are mixed evenly to obtain a synergistic fertilizer containing the fertilizer synergist; The mass ratio of the fertilizer synergist, the fertilizer raw material and the auxiliary material is 2-10:500-980:0-400; The fertilizer raw materials include one or more of urea, monoammonium phosphate, potassium sulfate, potassium chloride, ammonium chloride, ammonium sulfate and potassium nitrate; The auxiliary material is one or more of bentonite, attapulgite, humic acid and talc.

6. The method for preparing a synergistic fertilizer containing a fertilizer synergist according to claim 5, wherein: It also includes granulation, drying and cooling.