CN113717006A - Nutrient fertilizer for beautifying and beautifying fruit surfaces of crops and preparation method thereof - Google Patents
Nutrient fertilizer for beautifying and beautifying fruit surfaces of crops and preparation method thereof Download PDFInfo
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- CN113717006A CN113717006A CN202111187342.5A CN202111187342A CN113717006A CN 113717006 A CN113717006 A CN 113717006A CN 202111187342 A CN202111187342 A CN 202111187342A CN 113717006 A CN113717006 A CN 113717006A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
- C05G5/23—Solutions
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
Abstract
The invention belongs to the technical field of preparation of nutrient fertilizers, and discloses a nutrient fertilizer for beautifying and beautiful fruit surfaces of crops, which comprises the following components in parts by weight: 5-8 parts of a polypeptide solution and 2-5 parts of a small molecule protective film agent. The invention sets up many kinds of peptide solution, small molecule protective film agent and nutrient element solution, thus make the fruit tree, after bearing fruit, the external surface of its fruit will form a layer of little thin protective nutrient film, and the nutrient film is water-retaining, the soft film has air permeability, increase the fruit surface and absorb and utilize automatically with the fruit, and increase peptide substance, improve photosynthesis, immunocompetence of the crop, increased the supplement of the microelement at the same time, has improved the quality of the fruit, it has high activity, adhesiveness is good, absorb fast and characteristic such as being fast-acting, can obviously improve the appearance and inherent quality of the fruit after spraying, can make the fruit expand rapidly, the fruit surface is clean, the fruit type is correct, reduce the malformed fruit and the commodity rate is improved outstandingly.
Description
Technical Field
The invention belongs to the technical field of preparation of nutrient fertilizers, and particularly relates to a nutrient fertilizer for beautifying and beautifying fruit surfaces of crops and a preparation method thereof.
Background
The fertilizer is a substance which can provide nutrients required by the growth and development of crops, improve the soil properties and improve the yield and quality of the crops, is an important production material in agricultural production, and can be generally divided into organic fertilizers, inorganic fertilizers and biological fertilizers, also can be divided into farmyard fertilizers and chemical fertilizers according to the sources, and is divided into complete fertilizers and incomplete fertilizers according to the amount of the contained nutrients; according to the characteristics of fertilizer supply, the fertilizer is divided into direct fertilizer and indirect fertilizer; according to the components, the fertilizer is divided into nitrogen fertilizer, potassium fertilizer, trace element fertilizer and rare earth element fertilizer.
At present, a grower often applies a nutrient fertilizer to a fruit tree when planting the fruit tree, so that the fruit tree can be ensured to have a good growth environment, and in the actual use process of the existing nutrient fertilizer, although sufficient nutrients and nutrient substances can be provided for the growth and development of the fruit tree, the outer surface of the fruit is not beautiful enough after the fruit is mature, and the fruit is easy to lose quantity of the fruit and reduce the economic income of the grower due to the defects of deformity, dull color, cracks, fine lines and the like, and the quality and the taste of the fruit are also influenced, so that the fruit needs to be improved, and the defects are solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the nutrient fertilizer for the fruit surfaces of the beauty-maintaining and beautiful crops and the preparation method thereof, and the nutrient fertilizer has the advantages of improving the beauty and quality of the fruit surfaces.
In order to achieve the purpose, the invention provides the following technical scheme: a nutrient fertilizer for beautifying and beautifying fruit surfaces of crops comprises the following components in parts by weight: 5-8 parts of a polypeptide solution, 2-5 parts of a small molecule protective film agent, 0.5-1 part of a nutrient element solution, 1-2 parts of a potassium-containing nutrient solution, 1-2 parts of a nitrogen-containing nutrient solution and 1-2 parts of a phosphorus-containing nutrient solution.
As a preferred technical scheme of the invention, the method specifically comprises the following steps:
the first step is as follows: firstly, preparing various peptide solutions, micromolecule protective films and nutrient element solutions according to a certain proportion by workers, and placing the peptide solutions, the micromolecule protective films and the nutrient element solutions in a classified manner;
the second step is that: then, the working personnel mix the potassium-containing nutrient solution, the nitrogen-containing nutrient solution and the phosphorus-containing nutrient solution according to equal proportion, then add the mixture into a stirring device in sequence for mixing and stirring, the mixing and stirring time is 40-60 min, so that the mixture can be uniformly mixed, a mixed solution can be obtained, then the mixed solution is diluted by water in a preparation container, the water consumption is 20-25% of the total weight, when the mixed solution is fully diluted, the mixed solution containing potassium, nitrogen and phosphorus can be obtained, and the basic nutritional requirements of fruit growth and development can be met due to the addition of potassium, nitrogen and phosphorus elements;
the third step: then, the working personnel put the various peptide solutions and the small molecule protective film agents into a stirring device, and put the various peptide solutions and the small molecule protective film agents into the stirring device in three batches, wherein the putting amounts of the various peptide solutions and the small molecule protective film agents in the first batch are respectively 20% of the weight of the various peptide solutions and the small molecule protective film agents in the first batch, then the various peptide solutions and the small molecule protective film agents in the first batch are mixed and stirred, the putting amounts of the various peptide solutions and the small molecule protective film agents in the second batch are respectively 30% of the weight of the various peptide solutions and the small molecule protective film agents in the second batch, then the various peptide solutions and the small molecule protective film agents in the second batch are mixed and stirred, and the putting amounts of the various peptide solutions and the small molecule protective film agents in the third batch are respectively 30% of the weight of the small molecule protective film agents in the third batch, and the final mixed and stirred;
the fourth step: then, the operator dilutes the nutrient element solution with water, the amount of the water is 10% of the total weight of the nutrient element solution, and finally the nutrient element diluent can be obtained, and then the operator can put the nutrient element diluent into the mixed liquid finally obtained in the third step, and the nutrient element diluent is mixed and stirred by using stirring equipment for 20 to 40 minutes, and finally the nutrient element diluent is diluted by water, and the amount of the water is 10 to 15% of the total weight;
the fifth step: fully stirring and mixing the mixed solution containing potassium, nitrogen and phosphorus with the final mixed solution in the fourth step, and controlling the stirring time to be 20-30 min, so as to finally obtain a nutrient fertilizer solution;
and a sixth step: subsequently, the staff utilizes the solution sampling device to extract a certain content of nutrient fertilizer solution, then carries out pH value detection on the nutrient fertilizer solution, and regarding the pH value as 5.8-6.2 as a standard, if the pH value of the nutrient fertilizer is lower than or higher than the standard of 5.8-6.2, the nutrient fertilizer solution will respectively present acidity and alkalinity at the moment, and meanwhile, the staff needs to adjust and neutralize the nutrient fertilizer solution, so as to ensure that the pH value is in a standard range.
As a preferred technical scheme of the invention, the preparation proportion of the multiple peptide solutions in the first step is as follows:
peptide component: 15% -20% (glycine 9% -11%)
Alanine: 3 to 4 percent of
Lysine: 3 to 4 percent of
Glutamic acid: 0 to 1 percent
As a preferred technical scheme of the invention, the preparation proportion of the small molecule protective film agent in the first step is as follows:
carboxymethyl cellulose: 0.4 to 0.6 percent
Xanthan gum: 0.08 to 0.15 percent
Styrene-acrylic emulsion: 0.5 to 0.8 percent
As a preferred technical scheme of the invention, the preparation proportion of the nutrient element solution in the first step is as follows:
calcium EDTA: 1.2 to 2.4 percent
EDTA magnesium: 1.2 to 2.0 percent
Zinc EDTA: 3.6 to 4.0 percent
EDTA manganese: 3.0 to 4.2 percent
EDTA copper: 0.6 to 1.1 percent
Sodium octaborate tetrahydrate: 1.6 to 5 percent
Molybdenum: 0.08 to 0.5 percent
As a preferred technical scheme of the invention, in the third step, the mixing and stirring time of the multiple peptide solutions and the small molecule protective film agent in the first batch is 5min-10min, the mixing and stirring time of the second batch is 10min-20min, and the mixing and stirring time of the third batch is 30min-50 min.
As a preferred technical scheme of the invention, the water in the second step and the fourth step adopts pure water without impurities, and the water temperature of the pure water is controlled to be 32-34 ℃.
As a preferred technical scheme of the invention, in the sixth step, workers need to prepare three solution sampling devices and perform classified sampling at the upper liquid level, the middle liquid level and the lower liquid level of the nutrient fertilizer solution, so that the accuracy and consistency of subsequent PH detection results are guaranteed.
As a preferred technical solution of the present invention, when the PH of the nutrient fertilizer solution in the sixth step is above or below 5.8-6.2, the nutrient fertilizer solution may be prepared and neutralized with sodium hydroxide, potassium hydroxide, ammonium hydroxide, nitric acid, sulfuric acid, hydrogen chloride and phosphoric acid, and then repeatedly detected and adjusted, so as to ensure that the PH value is finally within the standard range of 5.8-6.2.
Compared with the prior art, the invention has the following beneficial effects:
the invention sets up a plurality of peptide solutions, micromolecule protective film agents and nutrient element solutions, thus after the fruit trees bear fruits, the outer surfaces of the fruits can form a layer of micro-thin protective nutrient film, the nutrient film has good water retention, the soft film has air permeability, the film can be automatically absorbed and utilized along with the increase of the fruit surfaces, peptide substances are added, the photosynthesis and the immunity of crops are improved, the supplement of trace elements is increased, the quality of the fruits is improved, the film agent has the characteristics of high activity, good adhesiveness, quick absorption, strong quick acting and the like, the appearance and the internal quality of the fruits can be obviously improved after being sprayed, the fruits can rapidly expand, the fruit surfaces are clean, the fruit types are correct, the malformed fruits are reduced, the commodity rate is obviously improved, and the film agent is rich in plant source small peptide amino acids and the trace elements such as Ca, Mg, Fe, Mn, Zn, Cu, B, molybdenum and the like, the fruit powder has the advantages of continuously moistening fruit surfaces, preventing cracks and fine lines, increasing waxiness and increasing fruit powder.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a nutrient fertilizer for beautifying and beautifying fruit surfaces of crops comprises the following components in parts by weight: 5-8 parts of a polypeptide solution, 2-5 parts of a small molecule protective film agent, 0.5-1 part of a nutrient element solution, 1-2 parts of a potassium-containing nutrient solution, 1-2 parts of a nitrogen-containing nutrient solution and 1-2 parts of a phosphorus-containing nutrient solution.
The method specifically comprises the following steps:
the first step is as follows: firstly, preparing various peptide solutions, micromolecule protective films and nutrient element solutions according to a certain proportion by workers, and placing the peptide solutions, the micromolecule protective films and the nutrient element solutions in a classified manner;
the second step is that: then, the working personnel mix the potassium-containing nutrient solution, the nitrogen-containing nutrient solution and the phosphorus-containing nutrient solution according to equal proportion, then add the mixture into a stirring device in sequence for mixing and stirring, the mixing and stirring time is 40-60 min, so that the mixture can be uniformly mixed, a mixed solution can be obtained, then the mixed solution is diluted by water in a preparation container, the water consumption is 20-25% of the total weight, when the mixed solution is fully diluted, the mixed solution containing potassium, nitrogen and phosphorus can be obtained, and the basic nutritional requirements of fruit growth and development can be met due to the addition of potassium, nitrogen and phosphorus elements;
the third step: then, the working personnel put the various peptide solutions and the small molecule protective film agents into a stirring device, and put the various peptide solutions and the small molecule protective film agents into the stirring device in three batches, wherein the putting amounts of the various peptide solutions and the small molecule protective film agents in the first batch are respectively 20% of the weight of the various peptide solutions and the small molecule protective film agents in the first batch, then the various peptide solutions and the small molecule protective film agents in the first batch are mixed and stirred, the putting amounts of the various peptide solutions and the small molecule protective film agents in the second batch are respectively 30% of the weight of the various peptide solutions and the small molecule protective film agents in the second batch, then the various peptide solutions and the small molecule protective film agents in the second batch are mixed and stirred, and the putting amounts of the various peptide solutions and the small molecule protective film agents in the third batch are respectively 30% of the weight of the small molecule protective film agents in the third batch, and the final mixed and stirred;
the fourth step: then, the operator dilutes the nutrient element solution with water, the amount of the water is 10% of the total weight of the nutrient element solution, and finally the nutrient element diluent can be obtained, and then the operator can put the nutrient element diluent into the mixed liquid finally obtained in the third step, and the nutrient element diluent is mixed and stirred by using stirring equipment for 20 to 40 minutes, and finally the nutrient element diluent is diluted by water, and the amount of the water is 10 to 15% of the total weight;
the fifth step: fully stirring and mixing the mixed solution containing potassium, nitrogen and phosphorus with the final mixed solution in the fourth step, and controlling the stirring time to be 20-30 min, so as to finally obtain a nutrient fertilizer solution;
and a sixth step: subsequently, the staff utilizes the solution sampling device to extract a certain content of nutrient fertilizer solution, then carries out pH value detection on the nutrient fertilizer solution, and regarding the pH value as 5.8-6.2 as a standard, if the pH value of the nutrient fertilizer is lower than or higher than the standard of 5.8-6.2, the nutrient fertilizer solution will respectively present acidity and alkalinity at the moment, and meanwhile, the staff needs to adjust and neutralize the nutrient fertilizer solution, so as to ensure that the pH value is in a standard range.
Wherein, the preparation proportion of the various peptide solutions in the first step is as follows:
peptide component: 15% -20% (glycine 9% -11%)
Alanine: 3 to 4 percent of
Lysine: 3 to 4 percent of
Glutamic acid: 0 to 1 percent
Wherein, the preparation proportion of the small molecule protective film agent in the first step is as follows:
carboxymethyl cellulose: 0.4 to 0.6 percent
Xanthan gum: 0.08 to 0.15 percent
Styrene-acrylic emulsion: 0.5 to 0.8 percent
Wherein, the preparation proportion of the nutrient element solution in the first step is as follows:
calcium EDTA: 1.2 to 2.4 percent
EDTA magnesium: 1.2 to 2.0 percent
Zinc EDTA: 3.6 to 4.0 percent
EDTA manganese: 3.0 to 4.2 percent
EDTA copper: 0.6 to 1.1 percent
Sodium octaborate tetrahydrate: 1.6 to 5 percent
Molybdenum: 0.08 to 0.5 percent
In the third step, the mixing and stirring time of the multiple peptide solutions and the small molecule protective film agent in the first batch is 5-10 min, the mixing and stirring time of the second batch is 10-20 min, and the mixing and stirring time of the third batch is 30-50 min.
Wherein, the water in the second step and the fourth step adopts pure water without impurities, and the water temperature of the pure water is controlled to be 32 ℃ to 34 ℃.
Wherein, staff need prepare three solution sampling device in the sixth step to carry out classification sampling at the last liquid level of nutrient fertilizer solution, well liquid level and lower liquid level, thereby guarantee follow-up PH testing result's accuracy and uniformity.
When the pH value of the nutrient fertilizer solution in the sixth step is more than or less than 5.8-6.2, sodium hydroxide, potassium hydroxide, ammonium hydroxide, nitric acid, sulfuric acid, hydrogen chloride and phosphoric acid can be adopted for blending and neutralization, and then the pH value is repeatedly detected and adjusted, so that the pH value is finally within the standard range of 5.8-6.2.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The nutrient fertilizer with the functions of beautifying and beautifying the fruit surfaces of crops is characterized by comprising the following components in parts by weight: 5-8 parts of a polypeptide solution, 2-5 parts of a small molecule protective film agent, 0.5-1 part of a nutrient element solution, 1-2 parts of a potassium-containing nutrient solution, 1-2 parts of a nitrogen-containing nutrient solution and 1-2 parts of a phosphorus-containing nutrient solution.
2. The preparation method of the fruit surface nutrition fertilizer for the beauty and beauty crops according to claim 1, is characterized by comprising the following steps:
the first step is as follows: firstly, preparing various peptide solutions, micromolecule protective films and nutrient element solutions according to a certain proportion by workers, and placing the peptide solutions, the micromolecule protective films and the nutrient element solutions in a classified manner;
the second step is that: then, a worker mixes the potassium-containing nutrient solution, the nitrogen-containing nutrient solution and the phosphorus-containing nutrient solution according to equal proportion, then sequentially adds the mixture into stirring equipment for mixing and stirring, the mixing and stirring time is 40-60 min, so that the mixture can be uniformly mixed, a mixed solution can be obtained, then the mixed solution is diluted by water in a preparation container, the water dosage is 20-25% of the total weight, and the mixed solution containing potassium, nitrogen and phosphorus can be obtained after the mixed solution is fully diluted;
the third step: then, the working personnel put the various peptide solutions and the small molecule protective film agents into a stirring device, and put the various peptide solutions and the small molecule protective film agents into the stirring device in three batches, wherein the putting amounts of the various peptide solutions and the small molecule protective film agents in the first batch are respectively 20% of the weight of the various peptide solutions and the small molecule protective film agents in the first batch, then the various peptide solutions and the small molecule protective film agents in the first batch are mixed and stirred, the putting amounts of the various peptide solutions and the small molecule protective film agents in the second batch are respectively 30% of the weight of the various peptide solutions and the small molecule protective film agents in the second batch, then the various peptide solutions and the small molecule protective film agents in the second batch are mixed and stirred, and the putting amounts of the various peptide solutions and the small molecule protective film agents in the third batch are respectively 30% of the weight of the small molecule protective film agents in the third batch, and the final mixed and stirred;
the fourth step: then, the operator dilutes the nutrient element solution with water, the amount of the water is 10% of the total weight of the nutrient element solution, and finally the nutrient element diluent can be obtained, and then the operator can put the nutrient element diluent into the mixed liquid finally obtained in the third step, and the nutrient element diluent is mixed and stirred by using stirring equipment for 20 to 40 minutes, and finally the nutrient element diluent is diluted by water, and the amount of the water is 10 to 15% of the total weight;
the fifth step: fully stirring and mixing the mixed solution containing potassium, nitrogen and phosphorus with the final mixed solution in the fourth step, and controlling the stirring time to be 20-30 min, so as to finally obtain a nutrient fertilizer solution;
and a sixth step: subsequently, the staff utilizes the solution sampling device to extract a certain content of nutrient fertilizer solution, then carries out pH value detection on the nutrient fertilizer solution, and regarding the pH value as 5.8-6.2 as a standard, if the pH value of the nutrient fertilizer is lower than or higher than the standard of 5.8-6.2, the nutrient fertilizer solution will respectively present acidity and alkalinity at the moment, and meanwhile, the staff needs to adjust and neutralize the nutrient fertilizer solution, so as to ensure that the pH value is in a standard range.
3. The preparation method of the fruit surface nutrition fertilizer for beauty and beauty crops according to claim 2, wherein the preparation ratio of the multiple peptide solutions in the first step is as follows:
peptide component: 15% -20% (glycine 9% -11%)
Alanine: 3 to 4 percent of
Lysine: 3 to 4 percent of
Glutamic acid: 0 to 1 percent.
4. The preparation method of the fruit surface nutrition fertilizer for the crops with beauty and beauty as claimed in claim 2, wherein the preparation ratio of the small molecule protective film agent in the first step is as follows:
carboxymethyl cellulose: 0.4 to 0.6 percent
Xanthan gum: 0.08 to 0.15 percent
Styrene-acrylic emulsion: 0.5 to 0.8 percent.
5. The preparation method of the fruit surface nutrient fertilizer for the beauty and beauty-maintaining crops according to claim 2, wherein the preparation ratio of the nutrient element solution in the first step is as follows:
calcium EDTA: 1.2 to 2.4 percent
EDTA magnesium: 1.2 to 2.0 percent
Zinc EDTA: 3.6 to 4.0 percent
EDTA manganese: 3.0 to 4.2 percent
EDTA copper: 0.6 to 1.1 percent
Sodium octaborate tetrahydrate: 1.6 to 5 percent
Molybdenum: 0.08 to 0.5 percent.
6. The method for preparing the fruit surface nutrient fertilizer for the beauty and beauty-maintaining crops, as claimed in claim 2, wherein in the third step, the mixing and stirring time of the multiple peptide solutions and the small molecule protective film agent in the first batch is 5min to 10min, the mixing and stirring time in the second batch is 10min to 20min, and the mixing and stirring time in the third batch is 30min to 50 min.
7. The method for preparing the fruit surface nutrient fertilizer for beauty and beauty crops according to claim 2, wherein the water in the second step and the fourth step is purified water without impurities, and the water temperature of the purified water is controlled to be 32 ℃ to 34 ℃.
8. The method for preparing the nutritious fertilizer for fruit surfaces of beauty and beauty-maintaining crops according to claim 2, wherein in the sixth step, the worker needs to prepare three solution sampling devices and perform classified sampling at the upper liquid level, the middle liquid level and the lower liquid level of the nutritious fertilizer solution, thereby ensuring the accuracy and consistency of the subsequent PH detection result.
9. The method for preparing the nutritious fertilizer for fruit and noodles of beauty and beauty-maintaining crops according to claim 2, wherein when the pH of the nutritious fertilizer solution in the sixth step is higher or lower than 5.8-6.2, the nutritious fertilizer solution can be neutralized by sodium hydroxide, potassium hydroxide, ammonium hydroxide, nitric acid, sulfuric acid, hydrogen chloride and phosphoric acid, and then repeatedly detected and adjusted, so as to ensure that the pH value is finally within the standard range of 5.8-6.2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111187342.5A CN113717006A (en) | 2021-10-12 | 2021-10-12 | Nutrient fertilizer for beautifying and beautifying fruit surfaces of crops and preparation method thereof |
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| CN202111187342.5A CN113717006A (en) | 2021-10-12 | 2021-10-12 | Nutrient fertilizer for beautifying and beautifying fruit surfaces of crops and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115677412A (en) * | 2022-11-18 | 2023-02-03 | 西安德农生物科技有限公司 | Fertilizer capable of protecting fruit surfaces of crops and preparation method thereof |
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| CN115677412B (en) * | 2022-11-18 | 2024-02-23 | 西安德农生物科技有限公司 | Fertilizer capable of protecting crop fruit surfaces and preparation method thereof |
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Application publication date: 20211130 |