Disclosure of Invention
In order to solve the technical problems, the invention provides the ionic calcium liquid fertilizer and the preparation method thereof, the preparation method is simple, the preparation conditions are mild, and the prepared ionic calcium liquid fertilizer can promote the absorption of plants on calcium and other growth nutrients and has the effects of protecting flowers and fruits, increasing the yield and improving the quality.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an ionic calcium liquid fertilizer which comprises the following raw materials in percentage by weight: 15-20 wt% of shell powder, 22-35 wt% of composite chelating agent, 4-6 wt% of urea, 5-10 wt% of surfactant, 8-12 wt% of humic acid and the balance of water.
Further, by weight percentage, 16 wt% of shell powder, 30 wt% of a compound chelating agent, 4 wt% of urea, 5 wt% of a surfactant, 10 wt% of humic acid and the balance of water.
Furthermore, the content of calcium element in the shell powder is more than or equal to 95%, and the mesh number is 500-800 meshes.
Further, the preparation method of the shell powder specifically comprises the following steps: washing shells with clear water for 5 times, soaking in 0.5mol/L NaOH solution for 15h, washing with clear water to neutrality, drying at 120 deg.C for 80min, and pulverizing to 800-1200 mesh.
Further, the shell powder mainly contains calcium carbonate (about 95 wt.%), and also contains part of chitin, small amount of amino acids and polysaccharide substances. After the shell powder is dissolved in water, calcium ions in the calcium carbonate can be chelated with a chelating agent to form chelated calcium, and the chitin is matched with the chelated calcium to effectively regulate the physiological metabolism of fruits, improve the quality of the fruits and reduce the peroxidation degree of cell membrane lipid, so that the integrity of cell walls is improved, and the resistance of the fruits is increased. Meanwhile, a small amount of amino acid and polysaccharide substances as small molecular substances can chelate a small part of calcium element, and the absorption of plant leaves to calcium is promoted.
Further, the compound chelating agent is composed of an amino acid chelating agent and an organic chelating agent in a mass ratio of (1-2): 1.
Further, the amino acid chelating agent comprises one or more of glycine, aspartic acid and glutamic acid, and the organic chelating agent comprises one or more of diethyltriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA) or ethylenediaminediphophylacetic acid (EDDHA).
Further, the surfactant comprises one or more of sodium dodecylbenzene sulfonate, sodium alkyl aryl sulfonate and sodium hydroxy alkyl sulfonate. The surfactant can improve the surface activity of the sprayed liquid fertilizer, and is favorable for wetting, adhering and permeating the foliar fertilizer on the leaf surfaces of plants.
The invention also provides a preparation method of the ionic calcium liquid fertilizer, which comprises the following steps:
1) weighing the raw materials according to the weight percentage, dissolving the composite chelating agent in water, adding shell powder, stirring, and reacting at constant temperature;
2) adding urea, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring;
3) and then adjusting the pH value to be acidic to obtain the ionic calcium liquid fertilizer.
Further, in the step 1), the temperature of the constant-temperature reaction is 55-65 ℃ and the time is 50-100 min. After the constant temperature reaction, the solution turns clear, which shows that calcium ions in the shell powder are all chelated.
Further, in the step 3), the pH is adjusted to be 5.0-6.0, so that when the pH is high and the pH is low, H is added + Will react with Ca 2+ Compete for electron donating groups resulting in Ca 2+ The obtained electrons are reduced, and the generation of chelated calcium is not facilitated; when the pH is too high, OH in the solution - The chance of binding calcium hydroxide increases and the formation or stabilization of chelated calcium is also not favored.
Further, in step 3), the pH is adjusted with glacial acetic acid and ammonia water.
The invention discloses the following technical effects:
the source of calcium in the ionic calcium liquid fertilizer is the shell powder, and the ionic calcium liquid fertilizer is easier to be absorbed by plant leaves compared with calcium sources such as calcium chloride and calcium nitrate, and partial chitin, amino acid and polysaccharide contained in the ionic calcium liquid fertilizer can also promote the plant to absorb calcium. Meanwhile, the compound chelating agent is adopted, on one hand, the amino acid chelating agent can enable the chelated calcium to have higher solubility in plants, obtain obvious movement advantages, overcome the defect that calcium ions are difficult to transport in phloem, and have high speed of penetrating through the cuticle of the leaves when being sprayed on the leaves and high utilization rate, and on the other hand, the organic chelating agent can slowly release calcium and increase the action timeliness of the liquid fertilizer. In addition, the liquid fertilizer disclosed by the invention is further added with urea, a surfactant and humic acid, so that the growth and development of plants are further promoted from the aspects of nutrition conveying and nutrition balance.
The ionic calcium liquid fertilizer disclosed by the invention is simple in preparation method and mild in preparation conditions, can promote plants to absorb calcium and other growth nutrients, has the effects of protecting flowers and fruits, increasing yield and improving quality, and is suitable for large-scale popularization and application.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but rather as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every intervening value, to the extent any stated value or intervening value in a stated range, and any other stated or intervening value in a stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The invention provides an ionic calcium liquid fertilizer which comprises the following raw materials in percentage by weight: 15-20 wt% of shell powder, 22-35 wt% of composite chelating agent, 4-6 wt% of urea, 5-10 wt% of surfactant, 8-12 wt% of humic acid and the balance of water.
Further, by weight percentage, 16 wt% of shell powder, 30 wt% of compound chelating agent, 4 wt% of urea, 5 wt% of surfactant, 10 wt% of humic acid and the balance of water.
Furthermore, the content of calcium element in the shell powder is more than or equal to 95%, and the mesh number is 500-800 meshes.
Further, the preparation method of the shell powder specifically comprises the following steps: washing shells with clear water for 5 times, soaking in 0.5mol/L NaOH solution for 15h, washing with clear water to neutrality, drying at 120 deg.C for 80min, and pulverizing to 800-1200 mesh.
Furthermore, the shell powder contains 95 percent of calcium carbonate as a main component, and also contains part of chitin, a small amount of amino acid and polysaccharide substances. After the shell powder is dissolved in water, calcium ions in calcium carbonate can be chelated with a chelating agent to form chelated calcium, and the chitin is matched with the chelated calcium to effectively regulate fruit physiological metabolism, reduce fruit quality and reduce the degree of cell membrane lipid peroxidation, so that the integrity of cell walls is improved, and the resistance of fruits is increased. Meanwhile, a small amount of amino acid and polysaccharide substances as small molecular substances can chelate a small part of calcium element, and the absorption of plant leaves to calcium is promoted.
Further, the compound chelating agent is composed of an amino acid chelating agent and an organic chelating agent in a mass ratio of (1-2): 1.
Further, the amino acid chelating agent comprises one or more of glycine, aspartic acid and glutamic acid, and the organic chelating agent comprises one or more of diethyltriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA) or ethylenediaminediphophylacetic acid (EDDHA).
Further, the surfactant comprises one or more of sodium dodecylbenzene sulfonate, sodium alkyl aryl sulfonate and sodium hydroxy alkyl sulfonate. The surfactant can improve the surface activity of the sprayed liquid fertilizer, and is favorable for wetting, adhering and permeating the foliar fertilizer on the leaf surfaces of plants.
The invention also provides a preparation method of the ionic calcium liquid fertilizer, which comprises the following steps:
1) weighing the raw materials according to the weight percentage, dissolving the composite chelating agent in water, adding shell powder, stirring, and reacting at constant temperature;
2) adding urea, a plant growth regulator, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring;
3) and then adjusting the pH value to be acidic to obtain the ionic calcium liquid fertilizer.
Further, in the step 1), the temperature of the constant-temperature reaction is 55-65 ℃ and the time is 50-100 min. After the constant temperature reaction, the solution turns clear, which shows that the calcium ions in the shell powder are all chelated.
Further, in the step 3), the pH is adjusted to be 5.0-6.0, so that when the pH is higher and lower, H is added + Will react with Ca 2+ Compete for electron donating groups resulting in Ca 2+ The obtained electrons are reduced, and the generation of chelated calcium is not facilitated; when the pH is too high, OH in the solution - The chance of binding calcium hydroxide increases and the formation or stabilization of chelated calcium is also not favored.
Further, in step 3), the pH was adjusted with glacial acetic acid and ammonia water.
The raw materials used in the examples of the present invention are commercially available.
The technical solution of the present invention is further illustrated by the following examples.
Example 1
1) Weighing the following raw materials in percentage by weight: 16 wt% of shell powder, 30 wt% of a composite chelating agent (the mass ratio of glycine to DTPA is 1:1), 4 wt% of urea, 5 wt% of a surfactant (sodium dodecyl benzene sulfonate), 10 wt% of humic acid and the balance of water;
2) dissolving the composite chelating agent in water, adding shell powder, stirring for 5min at 300r/min, and reacting at 60 ℃ for 60 min;
3) adding urea, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring at 300r/min for 10 min;
4) and then adjusting the pH value to 5.4 by using glacial acetic acid and ammonia water to obtain the ionic calcium liquid fertilizer.
Example 2
1) Weighing the following raw materials in percentage by weight: 18 wt% of shell powder, 26 wt% of compound chelating agent (the mass ratio of aspartic acid to EDDHA is 2:1), 5 wt% of urea, 5 wt% of surfactant (sodium alkyl aryl sulfonate), 9 wt% of humic acid and the balance of water;
2) dissolving the composite chelating agent in water, adding shell powder, stirring for 5min at 300r/min, and reacting at 65 ℃ for 50 min;
3) adding urea, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring at 300r/min for 10 min;
4) and then regulating the pH value to 6.0 by using glacial acetic acid and ammonia water to obtain the ionic calcium liquid fertilizer.
Example 3
1) Weighing the following raw materials in percentage by weight: 20 wt% of shell powder, 22 wt% of compound chelating agent (the mass ratio of glutamic acid to EDTA is 1:1), 4 wt% of urea, 5 wt% of surfactant (sodium hydroxyalkyl sulfonate), 12 wt% of humic acid and the balance of water;
2) dissolving the composite chelating agent in water, adding shell powder, stirring for 5min at 300r/min, and reacting at the constant temperature of 55 ℃ for 100 min;
3) adding urea, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring at 300r/min for 10 min;
4) and then adjusting the pH value to 5.8 by using glacial acetic acid and ammonia water to obtain the ionic calcium liquid fertilizer.
Example 4
1) Weighing the following raw materials in percentage by weight: 15 wt% of shell powder, 35 wt% of compound chelating agent (the mass ratio of glycine to EDDHA is 2:1), 6 wt% of urea, 10 wt% of surfactant (sodium dodecyl benzene sulfonate), 8 wt% of humic acid and the balance of water;
2) dissolving the composite chelating agent in water, adding shell powder, stirring for 5min at 300r/min, and reacting at 65 ℃ for 80 min;
3) adding urea, a plant growth regulator, a surfactant and humic acid into the solution obtained in the step 1), and continuously stirring at 300r/min for 10 min;
4) and then adjusting the pH value to 5.5 by using glacial acetic acid and ammonia water to obtain the ionic calcium liquid fertilizer.
Comparative example 1
The only difference from example 1 is that the complex chelator is replaced equally by the single chelator glycine.
Comparative example 2
The only difference from example 1 is that the complex chelator is replaced equally with the single chelator DTPA.
Comparative example 3
The only difference from example 1 is that the isothermal reaction time was 40 ℃ and 110 min.
Comparative example 4
The only difference from example 1 is that the pH is adjusted to 7.4.
Comparative example 5
The only difference from example 1 is that the shell powder is replaced by calcium nitrate in equal amounts.
Fertilizer efficiency test
Yield increasing test for Chinese cabbage
From 10 months to 1 month of 2021 in 2020, the method is carried out at the sun and at room temperature in a plant soil and fertilizer research institute of agricultural academy of sciences in Hubei province, the planted Chinese cabbages are named as Qingza III, potted plants are adopted, each pot is filled with 5kg of soil (pH is 7.62, nitrogen content is 0.25mg/g, potassium content is 78mg/g, phosphorus content is 3.85mg/g, and calcium content is 20mg/g), seedlings are fixed in the three-leaf period of the seedlings, 3 seedlings are planted in each pot, 45 pots are planted in total, the fertilizers prepared in examples 1-4 and comparative examples 1-5 are diluted with water, a blank control group is set to be equal amount of clear water, the spraying is carried out in the four-leaf period of the seedlings, each treatment is repeated for 5 times, and the specific treatment is shown in Table 1.
TABLE 1 modes of treatment
Harvesting at No. 15/1/2021, removing roots of each Chinese cabbage after harvesting, weighing to obtain biomass (fresh weight), and determining total calcium content according to concentrated nitric acid-perchloric acid digestion-atomic absorption spectrophotometry in GBT 23375-.
TABLE 2 measurement results
Group of
|
Biomass (kg/basin)
|
Calcium content (mg/basin)
|
Example 1
|
10.58
|
202.3
|
Example 2
|
9.89
|
189.4
|
Example 3
|
10.31
|
198.9
|
Example 4
|
9.74
|
194.6
|
Comparative example 1
|
5.36
|
89.3
|
Comparative example 2
|
4.85
|
74.2
|
Comparative example 3
|
4.93
|
65.6
|
Comparative example 4
|
4.52
|
68.4
|
Control group
|
2.88
|
4.6 |
As can be seen from the data in Table 2, the fertilizer prepared by the embodiment of the invention can improve the calcium absorption of the Chinese cabbage by foliage spraying, so that the yield of the Chinese cabbage is increased, and the comparative example shows that the ionic calcium liquid fertilizer prepared by the embodiment of the invention can achieve the purpose of increasing the yield by changing the types of the chelating agents, the chelation reaction time and the pH condition of the fertilizer, although the calcium content and the biomass are improved compared with those of a control group, the ionic calcium liquid fertilizer is far lower than that of the embodiment of the invention.
Second, strawberry yield increase test
From 8 months to 2021 months in 2020, the method is carried out at a sunlight room temperature in a plant soil fertilizer research institute of agricultural academy of sciences in Hubei province, the planted strawberries are No. 1 star, potted plants are adopted, 5kg of soil (pH 7.62, nitrogen content 0.25mg/g, potassium content 78mg/g, phosphorus content 3.85mg/g and calcium content 20mg/g) is filled in each pot, 4 strawberries are planted in each pot, 45 pots are planted in total, the fertilizers prepared in examples 1 to 4 and comparative examples 1 to 5 are diluted with water, a blank control group is set to be equal amount of clear water, the spraying is carried out at the early flowering phase of the strawberries, each treatment is repeated for 5 times, and the specific treatment is shown in Table 3.
TABLE 3 modes of treatment
The strawberry is harvested in No. 20 at No. 4/2021, the strawberry in each pot is collected, weighed after pedicle removal, averaged, and calculated to obtain the yield (g/pot) of the strawberry, the content of soluble sugar is determined according to an anthrone colorimetric method, and the content of calcium in the strawberry fruit is determined according to a concentrated nitric acid-perchloric acid digestion-atomic absorption spectrophotometry method in GBT 23375-one 2009, and the results are shown in Table 4.
TABLE 4 measurement results
As can be seen from the data in Table 4, the ionic calcium liquid fertilizer prepared in the embodiment of the invention can effectively improve the yield and sweetness of strawberries, and the change of the type of the chelating agent, the chelating reaction time and the pH value of the fertilizer in the preparation process can affect the action and efficacy of the fertilizer, so that the ionic calcium liquid fertilizer prepared in the invention has the effects of flower and fruit protection, yield increase and sweetness improvement.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.