CN113173828A - Nano selenium fertilizer and preparation method thereof - Google Patents
Nano selenium fertilizer and preparation method thereof Download PDFInfo
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- CN113173828A CN113173828A CN202110445469.6A CN202110445469A CN113173828A CN 113173828 A CN113173828 A CN 113173828A CN 202110445469 A CN202110445469 A CN 202110445469A CN 113173828 A CN113173828 A CN 113173828A
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- 239000011669 selenium Substances 0.000 title claims abstract description 98
- 229910052711 selenium Inorganic materials 0.000 title claims abstract description 98
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000003337 fertilizer Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229940091258 selenium supplement Drugs 0.000 claims abstract description 97
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 62
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229930003268 Vitamin C Natural products 0.000 claims abstract description 31
- 235000019154 vitamin C Nutrition 0.000 claims abstract description 31
- 239000011718 vitamin C Substances 0.000 claims abstract description 31
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 30
- 241001122767 Theaceae Species 0.000 claims abstract description 17
- BVTBRVFYZUCAKH-UHFFFAOYSA-L disodium selenite Chemical compound [Na+].[Na+].[O-][Se]([O-])=O BVTBRVFYZUCAKH-UHFFFAOYSA-L 0.000 claims abstract description 17
- 229960001471 sodium selenite Drugs 0.000 claims abstract description 17
- 235000015921 sodium selenite Nutrition 0.000 claims abstract description 17
- 239000011781 sodium selenite Substances 0.000 claims abstract description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004202 carbamide Substances 0.000 claims abstract description 15
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims abstract description 15
- 235000019796 monopotassium phosphate Nutrition 0.000 claims abstract description 15
- 239000001103 potassium chloride Substances 0.000 claims abstract description 15
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 15
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims abstract description 12
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims abstract description 12
- 235000013877 carbamide Nutrition 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 27
- 238000002791 soaking Methods 0.000 abstract description 24
- 241000196324 Embryophyta Species 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 230000004071 biological effect Effects 0.000 abstract description 5
- 235000012054 meals Nutrition 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 230000012010 growth Effects 0.000 abstract description 4
- 231100000053 low toxicity Toxicity 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 230000004060 metabolic process Effects 0.000 abstract description 3
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 abstract description 3
- 235000016709 nutrition Nutrition 0.000 abstract description 2
- 230000035764 nutrition Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 46
- 239000000243 solution Substances 0.000 description 40
- 230000035784 germination Effects 0.000 description 37
- 238000012360 testing method Methods 0.000 description 12
- 241000208822 Lactuca Species 0.000 description 9
- 235000003228 Lactuca sativa Nutrition 0.000 description 9
- 244000000626 Daucus carota Species 0.000 description 8
- 235000002767 Daucus carota Nutrition 0.000 description 8
- 240000008042 Zea mays Species 0.000 description 8
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 8
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 8
- 235000005822 corn Nutrition 0.000 description 8
- 235000021186 dishes Nutrition 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 6
- 230000007226 seed germination Effects 0.000 description 5
- 238000012935 Averaging Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 208000035240 Disease Resistance Diseases 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 230000036737 immune function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015816 nutrient absorption Nutrition 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 229960002816 potassium chloride Drugs 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009758 senescence Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- 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
Abstract
The invention discloses a nano selenium fertilizer and a preparation method thereof, wherein the nano selenium fertilizer comprises the following components in parts by weight: 60-100 parts of tea seed cake base extracting solution, 0.3-1 part of sodium selenite, 0.6-3 parts of vitamin C, 6-10 parts of urea, 1-4 parts of monopotassium phosphate and 0.5-3 parts of potassium chloride. According to the invention, when vitamin C exists in the tea seed meal base extracting solution, sodium selenite can be reduced to generate nano selenium, the nano selenium has biological characteristics of low toxicity, high biological activity, high absorption and utilization efficiency and the like, and is compounded with chemical fertilizers such as urea, potassium dihydrogen phosphate, potassium chloride and the like, so that the prepared nano selenium fertilizer is used for soaking seeds or spraying on the leaf surfaces of crops, and the nano selenium fertilizer can stimulate the growth and development of plants, germinate seeds, improve the root activity, promote the metabolism of the plants and absorb nutrition.
Description
Technical Field
The invention belongs to the technical field of selenium-rich fertilizer preparation, and relates to a nano selenium fertilizer, in particular to a nano selenium fertilizer and a preparation method thereof.
Background
Selenium is a trace element necessary for human bodies, is an active center of various enzymes in the human bodies, and plays roles in resisting diseases, delaying senescence and enhancing immune functions in life. Selenium is not only beneficial to human bodies, but also a beneficial element required by plant growth, can stimulate the growth and development of plants, seed germination and root system activity, promote nutrient absorption and plant metabolism, improve photosynthesis and chlorophyll content, enhance the biological antioxidation and environmental stress resistance of plants, improve the disease resistance and stress resistance of crops, and obviously improve the selenium content of agricultural products after selenium fertilizer is applied, thereby greatly improving the commodity value. In the prior art, the selenium fertilizer is mostly solid substances, and the direct use of sodium selenite is common; or the sodium selenite is mixed with organic matters such as animal excrement and/or plant fallen leaves, and then the compost is decomposed to form the organic selenium. However, sodium selenite has strong toxicity and low absorption efficiency, and has certain risks in use; the organic selenium has higher biological activity for animals to absorb, but has low absorption efficiency for crops and higher toxicity than nano selenium. The nano-selenium has the biological characteristics of low toxicity, high biological activity, high absorption and utilization efficiency and the like, and has wide application prospect in the field of fertilizers.
The preparation of the nano-selenium is generally carried out in solution, the contact area among various reaction components is large, the reaction is relatively sufficient, but a reducing agent, a dispersing agent and a stabilizing and protecting agent are added. The preparation method is more complex, the process is complicated and difficult to control, and more energy is consumed, so that the production cost is high, and the prepared nano-selenium does not have water solubility and biocompatibility, so that the search for a simple, easy, efficient and energy-saving method is more important.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a nano selenium fertilizer and a preparation method thereof. The nano selenium fertilizer has good water solubility and biocompatibility, is easy to be absorbed by seeds or plants, promotes the germination of the seeds, and stimulates the growth and development of the plants.
In order to achieve the purpose, the invention adopts the technical scheme that: the nano selenium fertilizer comprises the following components in parts by weight: 60-100 parts of tea seed cake base extracting solution, 0.3-1 part of sodium selenite, 0.6-3 parts of vitamin C, 6-10 parts of urea, 1-4 parts of monopotassium phosphate and 0.5-3 parts of potassium chloride.
The tea seed meal base extracting solution is compounded with vitamin C and sodium selenite, the vitamin C can reduce the sodium selenite to generate nano selenium in the presence of the tea seed meal base extracting solution, the nano selenium has the biological characteristics of low toxicity, high biological activity, high absorption and utilization efficiency and the like, and the nano selenium is compounded with chemical fertilizers such as urea, potassium dihydrogen phosphate, potassium chloride and the like to prepare nano selenium fertilizer to be used for soaking or spraying on crops, so that the growth and development of the plants, the seed germination and the root activity improvement can be stimulated, the plant metabolism is promoted, and the nutrition is absorbed.
Moreover, the inventor discovers through a large number of experiments that the components of the nano selenium fertilizer have obvious promotion effects on the germination rates and the germination potentials of the corn white glutinous rice seeds, the carrot seeds and the lettuce seeds within the limited range of the invention; wherein the numerical values of the germination rate and the germination potential of the corn white glutinous rice seeds promoted by the nano selenium fertilizer are respectively more than 45.52% and more than 43.12%; the values of the germination rate and the germination vigor of carrot seeds promoted by the nano selenium fertilizer are respectively over 28.75 percent and over 25.65 percent; the germination rate and the germination potential of the lettuce seeds promoted by the nano selenium fertilizer are respectively more than 92.56% and more than 73.36%.
As a preferred embodiment of the invention, the nano selenium fertilizer comprises the following components in parts by weight: 75-100 parts of tea seed cake base extracting solution, 0.7-1 part of sodium selenite, 1.6-3 parts of vitamin C, 7.5-10 parts of urea, 2.5-4 parts of monopotassium phosphate and 1.5-3 parts of potassium chloride.
Through a large number of experiments and explorations, the components of the nano selenium fertilizer obtained through multiple optimization are within the limited range of the invention, the promotion effects on the germination of the corn white glutinous seeds, the carrot seeds and the lettuce seeds are improved, wherein the values of the germination rate and the germination potential of the nano selenium fertilizer for promoting the germination of the corn white glutinous seeds are respectively more than 48.46% and more than 43.26%; the values of the germination rate and the germination vigor of carrot seeds promoted by the nano selenium fertilizer are respectively more than 32.65% and more than 26.26%; the values of the germination rate and the germination vigor of the lettuce seeds promoted by the nano selenium fertilizer are respectively more than 93.25% and more than 78.65%.
More preferably, the nano selenium fertilizer comprises the following components in parts by weight: 90 parts of tea seed cake base extracting solution, 0.7 part of sodium selenite, 1.6 parts of vitamin C, 8 parts of urea, 3 parts of monopotassium phosphate and 2 parts of potassium chloride.
Through a large number of experiments and researches, the components of the nano selenium fertilizer obtained through multiple optimization in the limited range of the invention have the best promotion effects on the germination rates and the germination potentials of the corn white glutinous seeds, the carrot seeds and the lettuce seeds, wherein the values of the germination rates and the germination potentials of the corn white glutinous seeds promoted by the nano selenium fertilizer are 56.67 percent and 46.67 percent respectively; the numerical values of the germination rate and the germination vigor of carrot seeds promoted by the nano selenium fertilizer are respectively 35.25% and 26.85%; the germination rate and the germination vigor of the lettuce seeds promoted by the nano selenium fertilizer are respectively 100.00 percent and 80.00 percent.
The invention also claims a preparation method of the nano selenium fertilizer, which comprises the following steps:
(1) heating and stirring the tea seed cake base extracting solution and sodium sulfite to obtain a solution A;
(2) dissolving vitamin C in water to obtain vitamin C solution;
(3) adding urea, monopotassium phosphate and potassium chloride into the solution A, and uniformly mixing to obtain a solution B;
(4) and adding the vitamin C solution into the solution B, and stirring to obtain the nano selenium fertilizer.
As a preferred embodiment of the present invention, in the step (1), the heating temperature is 30-45 ℃ and the heating and stirring time is 0.5-1 h.
In a preferred embodiment of the present invention, in the step (4), the stirring time is 1 to 2 hours.
As a preferred embodiment of the present invention, in the step (2), the concentration of vitamin C in the vitamin C solution is 0.100 to 0.143 g/mL.
In the step (4), the vitamin C solution is dripped into the solution B and stirred to obtain the nano selenium fertilizer.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, when vitamin C exists in the tea seed meal base extracting solution, sodium selenite can be reduced to generate nano selenium, the nano selenium has biological characteristics of low toxicity, high biological activity, high absorption utilization efficiency and the like, and is compounded with chemical fertilizers such as urea, monopotassium phosphate, potassium chloride and the like to prepare the nano selenium fertilizer.
(2) The nano selenium fertilizer is a liquid nano selenium fertilizer, the liquid nano selenium fertilizer has long retention time on leaf surfaces and good moisture retention, can strongly permeate and penetrate into the wax layer of the leaf blades, promotes the absorption of nutrient elements, improves the absorption efficiency of nutrients, contains a large amount of nutrients such as polypeptide, amino acid, polysaccharide, trace elements and the like, and is easier to be utilized by plants. Can be used for seed soaking, and can also be applied by combining drip irrigation, micro irrigation and infiltrating irrigation technologies, so that the selenium fertilizer can be popularized and used as a high-efficiency liquid selenium fertilizer.
(3) The preparation method of the invention has the advantages of simple required equipment, normal pressure preparation condition, short required time, no wastewater discharge in the process, easy control of the preparation process and suitability for industrial production.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Examples 1 to 5
In the embodiment of the nano selenium fertilizer, the components of the nano selenium fertilizer are shown in table 1.
Table 1 proportion of each component in examples 1-5 in nano selenium fertilizer
| Component (parts by weight) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Tea seed cake base extracting solution | 60 | 70 | 75 | 90 | 100 |
| Urea | 6 | 7 | 7.5 | 8 | 10 |
| Potassium dihydrogen phosphate | 1 | 2 | 2.5 | 3 | 4 |
| Potassium chloride | 0.5 | 1 | 1.5 | 2 | 3 |
| Sodium selenite | 0.3 | 0.5 | 0.6 | 0.7 | 1 |
| Vitamin C | 0.6 | 1.2 | 1.5 | 1.6 | 3 |
The preparation method of the nano selenium fertilizer comprises the following steps:
(1) stirring the tea seed cake base extracting solution and sulfurous acid for 1 hour at 45 ℃ to obtain a solution A;
(2) dissolving vitamin C in water to obtain vitamin C solution; the concentration of the vitamin C in the vitamin C solution is 0.1 g/mL;
(3) adding urea, monopotassium phosphate and potassium chloride into the solution A, and uniformly mixing to obtain a solution B;
(4) and dropwise adding the vitamin C solution into the solution B, and stirring for 1.5h to obtain the nano selenium fertilizer.
Comparative example 1
The comparative example of the nano selenium fertilizer is the same as the comparative example 4 except for the following differences: in the comparative example, the same weight part of water is used for replacing the tea seed cake base extracting solution.
Comparative example 2
The comparative example of the nano selenium fertilizer is the same as the comparative example 4 except for the following differences: in this comparative example, equal parts by weight of water were used instead of sodium selenite.
Comparative example 3
The comparative example of the nano selenium fertilizer is the same as the comparative example 4 except for the following differences: the comparative example only contains the tea seed cake base extracting solution and does not contain urea, monopotassium phosphate, potassium chloride, sodium selenite and vitamin C; the weight of the tea meal based extract was the same as the sum of the weights of all components in example 4.
Comparative example 4
The invention relates to a comparative example of a nano selenium fertilizer, and the product of the comparative example is water.
Comparative example 5
The comparative example of the nano selenium fertilizer is the same as the comparative example 4 except for the following differences: the comparative example replaces vitamin C with equal parts by weight of water.
Test example 1
Seed soaking experiments were carried out using the nano-selenium fertilizers prepared in examples 1 to 5 and comparative examples 1 to 5. And diluting the prepared nano selenium fertilizer serving as a stock solution with deionized water to obtain a test sample nano selenium fertilizer solution. During the test, the corn white waxy seeds with uniform size, health and plump are selected and soaked in the nano selenium fertilizer solution for 24 hours at room temperature, the soaked corn white waxy seeds are selected and placed in culture dishes, a piece of filter paper is padded at the bottom of each culture dish, and the culture dishes are moistened by the nano selenium fertilizer solution. Placing 60 seeds into each culture dish, counting and averaging three groups of parallel samples, placing the culture dishes in a culture room for culture, keeping the seeds in a wet state every day, wherein the result of seed soaking activity is shown in table 2, and the germination potential (%) is (the number of seeds which normally germinate on the 2 nd day/the total number of the seeds to be tested) multiplied by 100%; germination rate (%) × (number of seeds normally germinated on the fourth day/total number of test seeds) × 100%.
TABLE 2 seed soaking Activity of Nano selenium Fertilizer prepared in examples 1 to 5 and comparative examples 1 to 5
| Group of | Germination rate | Vigor of germination |
| Example 1 | 45.52 | 43.12 |
| Example 2 | 46.76 | 43.12 |
| Example 3 | 48.46 | 46.67 |
| Example 4 | 56.67 | 46.67 |
| Example 5 | 48.46 | 43.26 |
| Comparative example 1 | 35.12 | 23.41 |
| Comparative example 2 | 37.56 | 36.23 |
| Comparative example 3 | 40.13 | 31.76 |
| Comparative example 4 | 36.67 | 23.34 |
| Comparative example 5 | 41.62 | 39.49 |
As can be seen from the data in Table 2, compared with comparative examples 1 to 5, the nano selenium fertilizer in examples 1 to 5 has higher seed soaking activity, wherein the seed soaking activity in example 4 is the highest. Although the comparative examples 1 to 3 have certain seed soaking activity, the seed soaking activity effect is not obvious in the examples 1 to 5, which shows that the nano selenium fertilizer has a synergistic effect and can obviously promote seed germination.
Test example 2
Seed soaking experiments were carried out using the nano-selenium fertilizers prepared in examples 1 to 5 and comparative examples 1 to 5. And diluting the prepared nano selenium fertilizer serving as a stock solution with deionized water to obtain a test sample nano selenium fertilizer solution. During the test, carrot seeds with uniform size, health and plump are selected and soaked in the nano selenium fertilizer solution for 24 hours at room temperature, the soaked carrot seeds are selected and placed into culture dishes, one piece of filter paper is padded at the bottom of each culture dish, and the culture dishes are moistened by the nano selenium fertilizer solution. Placing 60 seeds into each culture dish, counting and averaging three groups of parallel samples, placing the culture dishes in a culture room for culture, keeping the seeds in a wet state every day, and showing the seed soaking activity result in a table 3, wherein the germination potential (%) is (the number of the seeds which normally germinate on the 2 nd day/the total number of the seeds to be tested) multiplied by 100%; germination rate (%) × (number of seeds normally germinated on the fourth day/total number of test seeds) × 100%.
TABLE 3 seed soaking Activity of Nano selenium fertilizers prepared in examples 1 to 5 and comparative examples 1 to 5
| Group of | Germination rate | Vigor of germination |
| Example 1 | 28.75 | 25.65 |
| Example 2 | 30.58 | 25.65 |
| Example 3 | 35.15 | 26.85 |
| Example 4 | 35.25 | 28.15 |
| Example 5 | 32.65 | 26.26 |
| Comparative example 1 | 18.25 | 16.25 |
| Comparative example 2 | 17.65 | 15.25 |
| Comparative example 3 | 22.65 | 18.75 |
| Comparative example 4 | 5.00 | 5.00 |
| Comparative example 5 | 22.01 | 20.40 |
As can be seen from the data in Table 3, compared with comparative examples 1 to 5, the nano selenium fertilizer in examples 1 to 5 has higher seed soaking activity, wherein the seed soaking activity in example 4 is the highest. Although the comparative examples 1 to 3 have certain seed soaking activity, the seed soaking activity effect is less obvious than that of the examples 1 to 5, which shows that the nano selenium fertilizer components of the invention generate a synergistic effect and can obviously promote seed germination.
Test example 3
Seed soaking experiments were carried out using the nano-selenium fertilizers prepared in examples 1 to 5 and comparative examples 1 to 5. And diluting the prepared nano selenium fertilizer serving as a stock solution with deionized water to obtain a test sample nano selenium fertilizer solution. During the test, healthy and plump lettuce seeds with uniform sizes are selected and soaked in the nano selenium fertilizer solution at room temperature for 24 hours, the soaked lettuce seeds are selected and placed into culture dishes, one piece of filter paper is padded at the bottom of each culture dish, and the lettuce seeds are moistened by the nano selenium fertilizer solution. Placing 60 seeds into each culture dish, counting and averaging three groups of parallel samples, placing the culture dishes in a culture room for culture, keeping the seeds in a wet state every day, and showing the seed soaking activity result in a table 4, wherein the germination potential (%) is (the number of seeds which normally germinate on the 2 nd day/the total number of the seeds to be tested) multiplied by 100%; germination rate (%) × (number of seeds normally germinated on the fourth day/total number of test seeds) × 100%.
TABLE 4 seed soaking Activity of Nano selenium Fertilizer prepared in examples 1 to 5 and comparative examples 1 to 5
| Group of | Germination rate | Vigor of germination |
| Example 1 | 92.56 | 76.35 |
| Example 2 | 95.34 | 73.36 |
| Example 3 | 93.25 | 78.65 |
| Example 4 | 100.00 | 80.00 |
| Example 5 | 95.35 | 80.00 |
| Comparative example 1 | 75.65 | 58.35 |
| Comparative example 2 | 76.28 | 60.00 |
| Comparative example 3 | 83.35 | 61.63 |
| Comparative example 4 | 70.00 | 56.60 |
| Comparative example 5 | 84.25 | 70.23 |
As can be seen from the data in Table 4, compared with comparative examples 1 to 5, the nano selenium fertilizer in examples 1 to 5 has higher seed soaking activity, wherein the seed soaking activity in example 4 is the highest. Although the comparative examples 1 to 3 have certain seed soaking activity, the seed soaking activity effect is less obvious than that of the examples 1 to 5, which shows that the nano selenium fertilizer components of the invention generate a synergistic effect and can obviously promote seed germination.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The nano selenium fertilizer is characterized by comprising the following components in parts by weight: 60-100 parts of tea seed cake base extracting solution, 0.3-1 part of sodium selenite, 0.6-3 parts of vitamin C, 6-10 parts of urea, 1-4 parts of monopotassium phosphate and 0.5-3 parts of potassium chloride.
2. The nano selenium fertilizer as claimed in claim 1, which comprises the following components in parts by weight: 75-100 parts of tea seed cake base extracting solution, 0.6-1 part of sodium selenite, 1.5-3 parts of vitamin C, 7.5-10 parts of urea, 2.5-4 parts of monopotassium phosphate and 1.5-3 parts of potassium chloride.
3. The nano selenium fertilizer as claimed in claim 1, which comprises the following components in parts by weight: 90 parts of tea seed cake base extracting solution, 0.7 part of sodium selenite, 1.6 parts of vitamin C, 8 parts of urea, 3 parts of monopotassium phosphate and 2 parts of potassium chloride.
4. The preparation method of the nano selenium fertilizer as claimed in claim 1, comprising the following steps:
(1) heating and stirring the tea seed cake base extracting solution and sodium sulfite to obtain a solution A;
(2) dissolving vitamin C in water to obtain vitamin C solution;
(3) adding urea, monopotassium phosphate and potassium chloride into the solution A, and uniformly mixing to obtain a solution B;
(4) and dropwise adding the vitamin C solution into the solution B, and stirring to obtain the nano selenium fertilizer.
5. The method for preparing the nano selenium fertilizer as claimed in claim 4, wherein in the step (1), the heating temperature is 30-45 ℃ and the heating and stirring time is 0.5-1 h.
6. The method for preparing nano selenium fertilizer as claimed in claim 4, wherein in the step (4), the stirring time is 1-2 h.
7. The method for preparing nano selenium fertilizer as claimed in claim 4, wherein in the step (2), the concentration of vitamin C in the vitamin C solution is 0.100-0.143 g/mL.
8. The method for preparing the nano selenium fertilizer as claimed in claim 4, wherein in the step (4), the vitamin C solution is dripped into the solution B and stirred to obtain the nano selenium fertilizer.
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