Light-carbon chelated fertilizer as well as preparation method and application thereof

Abstract

The invention belongs to the field of fertilizers, and particularly relates to a light-carbon chelated fertilizer and a preparation method and application thereof, and the light-carbon chelated fertilizer comprises the following raw materials by weight: 20-40 parts of organic matter, 10 parts of trace elements, 0.5-2 parts of polyglutamic acid or derivatives thereof, 1-3 parts of oligopeptide, 1-2 parts of a modified adsorbent, 5-15 parts of chitosan oligosaccharide, 0.5-1 part of an NKP fertilizer and 1-2 parts of water. The preparation process is simple, the raw materials are easy to obtain, the retention time of the fertilizer is effectively prolonged during use, the fertilizer efficiency is ensured, the utilization rate of the fertilizer efficiency is improved, and the fertilizer has good rooting, disease-resistant, stress-resistant and yield-increasing effects on corn, rice and other economic crops.

Description

Technical Field

[0001] The invention belongs to the field of fertilizers, and in particular relates to a light-carbon chelated fertilizer and a preparation method and application thereof. Background Art

[0002] Fertilizer is a substance added to the soil to provide nutrition for plants. The addition of fertilizer can improve the soil and improve agricultural production efficiency. It is one of the material bases of agricultural production. With the development of fertilization technology and agricultural production, the current market is more inclined to choose fertilizer products with the advantages of fast absorption, strong effect, low dosage and high efficiency, which has also created a variety of fertilizers that meet various needs. During the growth period of plants, they need to continuously carry out photosynthesis to provide sufficient energy for their normal growth and development, so as to synthesize various enzymes required for their own functions. In addition to nitrogen, phosphorus and potassium fertilizers, trace elements are also important nutrients necessary for plant organisms and play an important role in the life activities of organisms. When a certain trace element is lacking, the growth and development of crops are significantly affected, the yield is reduced, the quality is reduced, and even withering and death. Trace element chelated fertilizer uses organic chelating agents to react with trace elements such as zinc, copper, manganese, and iron in a certain proportion to make the elements chelated, forming a fertilizer that is easy to be absorbed and utilized by crops.

[0003] The invention patent with publication number CN118026775A discloses a trace element chelate fertilizer, its preparation method, application and fertilization method, wherein the trace element chelate fertilizer disclosed in the invention includes the following components: 10-30 parts of urea, 10-20 parts of potassium dihydrogen phosphate, 10-20 parts of monoammonium phosphate, 10-20 parts of potassium nitrate, 1-3 parts of anhydrous magnesium sulfate, 1-2 parts of zinc sulfate heptahydrate, 5-10 parts of chelating agent, 3-5 parts of adhesive, and the trace element chelate fertilizer has the advantages of low production cost, suitable for large-scale industrial production, and good chelation effect. However, the chelate fertilizer has a single function and poor universality. In the prior art, when a variety of special functional fertilizer components are simply mixed and used, the fertilizer components often conflict with each other, and the fertilizer release is poor in durability, resulting in poor fertilizer efficiency utilization. Summary of the invention

[0004] In view of the existing technical problems, the purpose of the present invention is to provide a light carbon chelate fertilizer and its preparation method and application. The present invention has a simple preparation process, readily available raw materials, effectively increases the fertilizer residence time, ensures fertilizer efficiency, improves fertilizer efficiency utilization, and has good rooting, disease resistance, stress resistance and yield-increasing effects on economic crops such as corn and rice.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] On one hand, the present invention provides a light carbon chelate fertilizer, which comprises the following raw materials in parts by weight: 20 to 40 parts of organic matter, 10 parts of trace elements, 0.5 to 2 parts of polyglutamic acid or its derivatives, 1 to 3 parts of oligopeptides, 1 to 2 parts of modified adsorbents, 5 to 15 parts of chitosan oligosaccharides, 0.5 to 1 part of NKP fertilizer and 1 to 2 parts of water.

[0007] In some embodiments of the present invention, the organic matter is corn fermented organic matter.

[0008] Preferably, the corn fermented organic matter is obtained by referring to the preparation steps of humus liquid disclosed in Example 2 of CN103044144B.

[0009] In some embodiments of the present invention, the trace elements are a mixture of Fe, Zn, Mn, Mo and B.

[0010] Preferably, the trace element is FeSO 4 7H 2 O、ZnSO 4 7H 2 O、MnSO 4 7H 2 O、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, H 3 BO 3 The mixture is mixed in a mass ratio of (1-2):(2-4):(0.5-1):(0.1-0.3):1.

[0011] In some embodiments of the present invention, the polyglutamic acid or its derivative is γ-polyglutamic acid or sodium γ-polyglutamate.

[0012] In some embodiments of the present invention, the preparation steps of the modified adsorbent are as follows:

[0013] (1) adding the mesoporous adsorbent to an organic solvent containing a modifier, maintaining room temperature, stirring and mixing, evacuating for 30 to 60 minutes, and then introducing air for 10 to 30 minutes, repeating the above evacuating and introducing air 1 to 3 times, washing, and drying to obtain a pretreated adsorbent;

[0014] (2) The pretreated adsorbent of step (1), ethanol and deionized water are mixed, dopamine hydrochloride and tris(hydroxymethyl)aminomethane are added, and then ethyl orthosilicate is added, and the mixture is heated to 30-35° C. and treated in an oil bath for 1-1.5 days. The mixture is filtered, washed and dried to obtain a modified adsorbent.

[0015] In some embodiments of the present invention, in step (1), the mesoporous adsorbent is activated carbon or molecular sieve.

[0016] Preferably, in step (1), the mesoporous adsorbent is activated carbon.

[0017] In some embodiments of the present invention, in step (1), the modifier is a nanoscale mixture of magnesium oxide and zinc oxide, and the mass ratio of the adsorbent to the modifier is 1:(1-1.6).

[0018] Preferably, the particle size of the magnesium oxide and zinc oxide is 15 to 20 nm.

[0019] In some embodiments of the present invention, in step (1), the mass ratio of magnesium oxide to zinc oxide is (0.3-0.7):1.

[0020] In some embodiments of the present invention, in step (2), the mass ratio of the pretreatment adsorbent, dopamine hydrochloride and tetraethyl orthosilicate in step (1) is 1:(0.1-0.4):(1-3).

[0021] In some embodiments of the present invention, the oligopeptide is a fish oligopeptide or a soybean oligopeptide.

[0022] In some embodiments of the present invention, the NKP fertilizer is a mixture of urea, ammonium phosphate and potassium sulfate.

[0023] Preferably, the mass ratio of urea, ammonium phosphate and potassium sulfate is 1:(1.2-1.6):(1.1-1.4).

[0024] In some embodiments of the present invention, the mass ratio of the modified adsorbent to polyglutamic acid or its derivative is (0.8-1.5):1.

[0025] The invention mixes raw materials such as organic matter, trace elements, polyglutamic acid or its derivatives, oligopeptides and oligochitosan through specific preparation steps, and good synergistic effect exists between the raw materials under specific selection and proportion, and has good rooting, disease resistance, stress resistance and yield-increasing effects on economic crops such as corn and rice. On the other hand, adsorbent is added as an auxiliary agent, and water and carbon dioxide in the air are adsorbed and enriched around the stems and leaves of the crops, so that photosynthesis and photosynthetic efficiency are further enhanced, and the light-carbon chelating fertilizer is promoted to take effect quickly.

[0026] Among them, the present invention further modifies the adsorbent in the prior art, adds magnesium oxide and zinc oxide into the mesoporous adsorbent, and repeatedly washes to remove the magnesium oxide and zinc oxide attached to the outer wall of the mesoporous adsorbent, so that the magnesium oxide and zinc oxide are completely loaded inside the mesoporous adsorbent, thereby achieving the controllable release of magnesium oxide and zinc oxide in the fertilizer system; at the same time, ethyl orthosilicate is deposited on the surface loaded with dopamine hydrochloride to form a branch-like micro-nano structure, which synergistically prolongs the time of capturing carbon dioxide. Compared with the prior art, the fertilizer efficiency of the light-carbon chelating fertilizer prepared by the present invention is greatly enhanced.

[0027] On the other hand, the present invention further regulates the ratio of the modified adsorbent and polyglutamic acid or its derivatives, thereby effectively reducing the volatilization and flocculation problems of polyglutamic acid or its derivatives that are prone to occur in the raw material components and improving the stability of the system components. The possible reason is that the reactants of dopamine hydrochloride and ethyl orthosilicate on the surface of the adsorbent play a certain adhesion role, which reduces the volatilization and flocculation aggregation of polyglutamic acid or its derivatives while promoting good dispersion of the components of the light carbon chelate fertilizer.

[0028] The second aspect of the present invention provides a method for preparing a light-carbon chelating fertilizer, comprising the following steps:

[0029] S1: adding trace elements, polyglutamic acid or its derivatives, oligopeptides and chitosan oligosaccharides to organic matter, stirring to obtain a mixture for later use;

[0030] S2: Mix the NKP fertilizer and water and then mix them with the mixture in step S1, then add the modified adsorbent and stir evenly to obtain the light carbon chelate fertilizer.

[0031] The third aspect of the present invention also provides an application of the light-carbon chelating fertilizer obtained by the above technical solution in corn and rice planting.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The preparation process of the present invention is simple, the raw materials are easily available, and the residence time of the fertilizer is effectively increased during use, thereby ensuring the fertilizer effect and improving the fertilizer efficiency utilization rate. In addition, the present invention has good rooting, disease resistance, stress resistance and yield-increasing effects on economic crops such as corn and rice.

[0034] (2) The present invention achieves a good synergistic effect by mixing raw materials such as organic matter, trace elements, polyglutamic acid or its derivatives, oligopeptides and oligochitosan, and has good rooting, disease resistance, stress resistance and yield increase effects on economic crops such as corn and rice; at the same time, an adsorbent is added as an auxiliary agent to adsorb and enrich water and carbon dioxide in the air around the stems and leaves of the crops, thereby further enhancing photosynthesis and photosynthetic efficiency, and promoting the rapid effectiveness of light-carbon chelating fertilizer.

[0035] (3) The present invention adds magnesium oxide and zinc oxide into the interior of the mesoporous adsorbent, and repeatedly washes to remove the magnesium oxide and zinc oxide attached to the outer wall of the mesoporous adsorbent, so that they are all loaded inside the mesoporous adsorbent, thereby achieving controllable release of magnesium oxide and zinc oxide in the fertilizer system, extending the time of carbon dioxide capture, and greatly enhancing the fertilizer effect of the light carbon chelate fertilizer.

[0036] (4) The present invention further regulates the ratio of the modified adsorbent and polyglutamic acid or its derivatives, thereby effectively reducing the volatilization and flocculation problems of polyglutamic acid or its derivatives that are prone to occur in the raw material components, improving the stability of the system components, and reducing the volatilization and flocculation agglomeration of polyglutamic acid or its derivatives while promoting good dispersion of the components of the light carbon chelate fertilizer, thereby retaining the efficacy. DETAILED DESCRIPTION

[0037] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, rather than to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0038] Unless otherwise specified, the relevant raw materials used in the following preparation examples, embodiments and comparative examples can be purchased from the market.

[0039] Unless otherwise specified, the organic matter used in the following preparation examples, embodiments and comparative examples is corn fermented organic matter, which is obtained by referring to the preparation steps of humus solution disclosed in Example 2 of CN103044144B; the trace element is FeSO 4 7H 2 O、ZnSO 4 7H 2 O、MnSO 4 7H 2 O、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O, H 3 BO 3 The oligopeptides used are all soybean oligopeptides; the NKP fertilizers used are all urea, ammonium phosphate and potassium sulfate mixed in a mass ratio of 1:1.4:1.3; the particle sizes of the magnesium oxide and zinc oxide used are both 15-20nm.

[0040] Unless otherwise specified, the "filtration", "washing" and "drying" used in the following preparation examples, embodiments and comparative examples can be freely selected by those skilled in the art, and the present invention is not limited thereto.

[0041] Preparation Example 1

[0042] The preparation steps of the modified adsorbent are as follows:

[0043] (1) Add 2 g of activated carbon to 40 mL of acetone containing 0.8 g of magnesium oxide and 2 g of zinc oxide, maintain the temperature at 25° C., stir and mix, evacuate for 40 min, and then introduce air for 20 min. Repeat the evacuation and introduction of air twice, wash and dry to obtain a pretreated adsorbent;

[0044] (2) 1 g of the pretreated adsorbent of step (1), 10 mL of ethanol and 5 mL of deionized water were mixed, 0.3 g of dopamine hydrochloride and 0.5 g of tris(hydroxymethyl)aminomethane were added, and then 2 g of ethyl orthosilicate was added. The mixture was heated to 33° C. and treated in an oil bath for 1.5 days. After suction filtration, washing and drying, the modified adsorbent was obtained.

[0045] Preparation Example 2

[0046] The preparation steps of the modified adsorbent are the same as those of Preparation Example 1, except that 3.6 g of magnesium oxide and zinc oxide in a mass ratio of 0.4:1 are added in step (1).

[0047] Preparation Example 3

[0048] The preparation steps of the modified adsorbent are the same as those of Preparation Example 1, except that the amount of dopamine hydrochloride added in step (2) is 0.5 g.

[0049] Preparation Example 4

[0050] The preparation steps of the modified adsorbent are the same as those of Preparation Example 1, except that the amount of ethyl orthosilicate added in step (2) is 3.5 g.

[0051] Preparation Example 5

[0052] The preparation steps of the modified adsorbent are as follows:

[0053] Add 2 g of activated carbon to 40 mL of acetone containing 2.6 g of magnesium oxide and 1 g of zinc oxide, maintain at 25°C, stir and mix, evacuate for 40 min, and then introduce air for 20 min. Repeat the above evacuation and introduction of air twice. After washing and drying, a modified adsorbent was obtained.

[0054] Example 1

[0055] A light carbon chelate fertilizer comprises the following raw materials in parts by weight: 30 parts of organic matter, 10 parts of trace elements, 1.3 parts of gamma-polyglutamic acid, 2 parts of oligopeptides, 1.5 parts of modified adsorbents, 12 parts of chitosan oligosaccharides, 0.7 parts of NKP fertilizer and 1.5 parts of water.

[0056] The preparation method of the light carbon chelate fertilizer of this embodiment is as follows:

[0057] S1: adding trace elements, γ-polyglutamic acid, oligopeptides and chitosan oligosaccharides to organic matter, stirring to obtain a mixture for later use;

[0058] S2: Mix the NKP fertilizer and water and then mix them with the mixture in step S1, then add the modified adsorbent and stir evenly to obtain the light carbon chelate fertilizer.

[0059] The modified adsorbent used in this example is obtained from Preparation Example 1.

[0060] Example 2

[0061] A light carbon chelate fertilizer comprises the following raw materials in parts by weight: 20 parts of organic matter, 10 parts of trace elements, 0.5 parts of gamma-polyglutamic acid, 1 part of oligopeptide, 1 part of modified adsorbent, 5 parts of chitosan oligosaccharide, 0.5 parts of NKP fertilizer and 1 part of water.

[0062] The preparation method of the light carbon chelate fertilizer of this embodiment is as follows:

[0063] S1: adding trace elements, γ-polyglutamic acid, oligopeptides and chitosan oligosaccharides to organic matter, stirring to obtain a mixture for later use;

[0064] S2: Mix the NKP fertilizer and water and then mix them with the mixture in step S1, then add the modified adsorbent and stir evenly to obtain the light carbon chelate fertilizer.

[0065] The modified adsorbent used in this example is obtained from Preparation Example 1.

[0066] Example 3

[0067] A light carbon chelate fertilizer comprises the following raw materials in parts by weight: 40 parts of organic matter, 10 parts of trace elements, 2 parts of gamma-polyglutamic acid, 3 parts of oligopeptides, 2 parts of modified adsorbents, 15 parts of chitosan oligosaccharides, 1 part of NKP fertilizer and 2 parts of water.

[0068] The preparation method of the light carbon chelate fertilizer of this embodiment is as follows:

[0069] S1: adding trace elements, γ-polyglutamic acid, oligopeptides and chitosan oligosaccharides to organic matter, stirring to obtain a mixture for later use;

[0070] S2: Mix the NKP fertilizer and water and then mix them with the mixture in step S1, then add the modified adsorbent and stir evenly to obtain the light carbon chelate fertilizer.

[0071] The modified adsorbent used in this example is obtained from Preparation Example 1.

[0072] Example 4

[0073] A light carbon chelate fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified adsorbent used in this example is obtained from Preparation Example 2.

[0074] Example 5

[0075] A light carbon chelate fertilizer and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that the modified adsorbent used in this example is obtained from Preparation Example 3.

[0076] Example 6

[0077] A light carbon chelate fertilizer and a preparation method thereof, the specific implementation manner is the same as that of Example 1, except that the modified adsorbent used in this example is obtained from Preparation Example 4.

[0078] Example 7

[0079] A light carbon chelate fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified adsorbent used in this example is obtained from Preparation Example 5.

[0080] Example 8

[0081] A light carbon chelate fertilizer and a preparation method thereof, the specific implementation manner is the same as that of Example 1, except that the mass ratio of the modified adsorbent and gamma-polyglutamic acid in the raw materials of this example is 1.7:1.

[0082] Comparative Example 1

[0083] A light carbon chelate fertilizer and a preparation method thereof, the specific implementation manner is the same as that of Example 1, except that in this example, an equal amount of activated carbon is used to replace the modified adsorbent.

[0084] Performance Testing:

[0085] The light carbon chelating fertilizers prepared in the above Examples 1-8 and Comparative Example 1 were subjected to the following application tests, and the specific results are shown in Table 1.

[0086] Farmland Experiment

[0087] The field test method was adopted, and the test corn variety was Jidan 33. The light carbon chelate fertilizer prepared in Examples 1-8 and Comparative Example 1 was used as a base fertilizer for corn planting. Ten days before sowing, it was applied 13 cm deep, 50 kg per mu of land, and 2 mu of land was treated. Three points were randomly arranged, and each point contained 30 m 2 After the corn matured, all the corn ears were broken off and weighed on site. The total weight was recorded as the yield of the experimental group. At the same time, 10 ears of corn were randomly taken from each point, and the length and weight of the ears were measured. The average value was taken. After natural air drying, the seeds were tested and the yield of corn with a moisture content of 14% was converted. The 100-grain weight was measured and the average value was taken. The same method was used to adjust the conventional fertilizer application rate of corn (CO(NH 2 ) 2 150kg·hm 2 , P 2 O 5 75kg·hm 2 , K2 O 45kg·hm 2 ) was used as the blank control group. The yield, ear length, ear weight and 100-grain weight of the blank control group were measured and the average values ​​were taken and substituted into the following formula to calculate the yield increase rate, where: yield increase rate = (yield of experimental group - yield of blank control group) / yield of blank control group × 100%.

[0088] Table 1

[0089] serial number Ear length (cm) Ear diameter (cm) Average 100-grain weight (g) Yield increase rate (%) Blank control group 18.76 16.05 36.50 - Example 1 20.17 17.14 40.12 25.03 Example 2 20.06 17.03 40.07 24.37 Example 3 20.02 16.99 39.97 23.94 Example 4 19.86 16.81 39.78 21.70 Example 5 19.81 16.79 39.87 21.53 Example 6 19.76 16.84 39.91 21.31 Example 7 19.53 16.62 39.47 19.16 Example 8 19.88 16.93 39.95 22.29 Comparative Example 1 18.65 15.81 38.83 16.83

[0090] It can be seen from the test results of Examples 1-3 disclosed in Table 1 that the light-carbon chelating fertilizer can maintain a relatively high ear length and ear weight of corn and has an excellent yield-increasing effect.

[0091] By comparing Example 4, Example 5 and Example 6 with Example 1, it can be seen that when the amount of the modifier added in step (1), i.e., a mixture of magnesium oxide and zinc oxide in a mass ratio of 0.4:1, the amount of dopamine hydrochloride added in step (2) and the amount of ethyl orthosilicate added in step (2) are changed respectively when preparing the modified adsorbent, the quality and yield of corn will decrease to varying degrees. Example 4 may inhibit the absorption of other nutrients by corn seeds, Example 5 may affect the balance between dispersion and agglomeration between the components of the light carbon chelate fertilizer, and Example 6 affects the time of carbon dioxide capture, all of which affect The results of Example 7 and Example 1 show that when the modified adsorbent is prepared without further surface modification, the synergistic effect of the modified adsorbent on the components of the light carbon chelate fertilizer may be affected, resulting in a decrease in the yield-increasing effect. When the mass ratio of the modified adsorbent and γ-polyglutamic acid is changed, the volatilization and flocculation of γ-polyglutamic acid may occur, affecting the fertilizer effect. When the modified adsorbent is replaced by an equal amount of activated carbon, the residence time and effectiveness of the components of the fertilizer are affected, and the fertilization effect is not ideal.

[0092] The above is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present application. Although the present application is disclosed as above in the preferred embodiment, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. A light carbon chelate fertilizer, characterized in that: The light carbon chelate fertilizer comprises the following raw materials in parts by weight: 20-40 parts of organic matter, 10 parts of trace elements, 0.5-2 parts of polyglutamic acid or its derivatives, 1-3 parts of oligopeptides, 1-2 parts of modified adsorbents, 5-15 parts of chitosan oligosaccharides, 0.5-1 parts of NKP fertilizer and 1-2 parts of water.

2. The light carbon chelate fertilizer according to claim 1, characterized in that The organic matter is corn fermented organic matter.

3. The light carbon chelate fertilizer according to claim 1, characterized in that The trace elements are a mixture of Fe, Zn, Mn, Mo and B.

4. The light carbon chelate fertilizer according to claim 1, characterized in that The polyglutamic acid or its derivative is γ-polyglutamic acid or sodium γ-polyglutamate.

5. The light carbon chelate fertilizer according to claim 1, characterized in that The preparation steps of the modified adsorbent are as follows: (1) adding the mesoporous adsorbent to an organic solvent containing a modifier, maintaining room temperature, stirring and mixing, evacuating for 30 to 60 minutes, and then introducing air for 10 to 30 minutes, repeating the above evacuating and introducing air 1 to 3 times, washing, and drying to obtain a pretreated adsorbent; (2) The pretreated adsorbent of step (1), ethanol and deionized water are mixed, dopamine hydrochloride and tris(hydroxymethyl)aminomethane are added, and then ethyl orthosilicate is added, and the mixture is heated to 30-35° C. and treated in an oil bath for 1-1.5 days. The mixture is filtered, washed and dried to obtain a modified adsorbent.

6. The light-carbon chelating fertilizer according to claim 5, characterized in that: In step (1), the modifier is a nano-scale mixture of magnesium oxide and zinc oxide, and the mass ratio of the mesoporous adsorbent to the modifier is 1: (1-1.6).

7. The light-carbon chelating fertilizer according to claim 5, characterized in that: In step (2), the mass ratio of the pretreatment adsorbent, dopamine hydrochloride and tetraethyl orthosilicate in step (1) is 1:(0.1-0.4):(1-3).

8. The light carbon chelate fertilizer according to claim 1, characterized in that The mass ratio of the modified adsorbent to polyglutamic acid or its derivative is (0.8-1.5):

1.

9. A method for preparing the light-carbon chelated fertilizer according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: adding trace elements, polyglutamic acid or its derivatives, oligopeptides and chitosan oligosaccharides to organic matter, stirring to obtain a mixture for later use; S2: Mix the NKP fertilizer and water and then mix them with the mixture in step S1, then add the modified adsorbent and stir evenly to obtain the light carbon chelate fertilizer.

10. Use of the light-carbon chelating fertilizer according to any one of claims 1 to 8 or the light-carbon chelating fertilizer obtained by the preparation method according to claim 9 in corn and rice planting.