CN117844486A - Nitrate nitrogen adsorption soil conditioner and combined application method of nitrate nitrogen adsorption soil conditioner and plants - Google Patents
Nitrate nitrogen adsorption soil conditioner and combined application method of nitrate nitrogen adsorption soil conditioner and plants Download PDFInfo
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- CN117844486A CN117844486A CN202311769335.5A CN202311769335A CN117844486A CN 117844486 A CN117844486 A CN 117844486A CN 202311769335 A CN202311769335 A CN 202311769335A CN 117844486 A CN117844486 A CN 117844486A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003516 soil conditioner Substances 0.000 title claims abstract description 21
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 70
- 235000014653 Carica parviflora Nutrition 0.000 claims abstract description 52
- 239000004576 sand Substances 0.000 claims abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010902 straw Substances 0.000 claims abstract description 7
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 244000132059 Carica parviflora Species 0.000 claims description 45
- 241000196324 Embryophyta Species 0.000 claims description 39
- 238000001914 filtration Methods 0.000 claims description 8
- 240000008042 Zea mays Species 0.000 claims description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 235000005822 corn Nutrition 0.000 claims description 6
- 238000002386 leaching Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 235000015097 nutrients Nutrition 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 229910017112 Fe—C Inorganic materials 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 239000003607 modifier Substances 0.000 claims description 4
- 238000000643 oven drying Methods 0.000 claims description 4
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 230000008635 plant growth Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 10
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- 230000029553 photosynthesis Effects 0.000 abstract description 2
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- 102000020897 Formins Human genes 0.000 description 1
- 108091022623 Formins Proteins 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 108010046334 Urease Proteins 0.000 description 1
- 229940090496 Urease inhibitor Drugs 0.000 description 1
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- 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
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- 239000011777 magnesium Substances 0.000 description 1
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Abstract
The invention discloses a nitrate nitrogen adsorption soil conditioner and a combined application method of the nitrate nitrogen adsorption soil conditioner and plants, belonging to the technical field of soil improvement, wherein the conditioner comprises biochar and coral sand improvement matrix; biochar accounts for 4% of the total mass of the coral sand modified matrix. In the invention, the retention rate of the matrix layer on nitrate nitrogen in the reclaimed water is higher than 85% under different hydraulic impact loads; compared with pure coral sand group and unmodified biochar group, the modified biochar mixed coral sand matrix can effectivelyPromoting plant growth and development and photosynthesis; aiming at the high permeability of coral sand, low organic matter, high pH and difficult plant growth, the method for creatively providing the modified biochar combined sand-fixing plant thick vine improves the nitrogen interception capability of coral sand and the circulation of coral sand substances; by FeCl 3 After modification, the adsorption capacity and the water retention property of the straw biochar are increased, and meanwhile, the iron element is required by plant growth and microorganism metabolism, so that the plant growth and the material circulation are promoted.
Description
Technical Field
The invention belongs to the technical field of soil improvement, and particularly relates to a nitrate nitrogen adsorption soil conditioner and a plant combined application method.
Background
The south China islands are mainly coral island reefs, and the surface soil of the south China islands is coral sand, so that the south China islands have the structural characteristics of coarse porosity and fragility. The coral sand has high permeability, lacks natural organic matters, is easy to cause structural water shortage, land impoverishment and ecological weakness of the island ecological system, and is unfavorable for healthy growth of surface vegetation and normal development of soil. In addition, the sea island reclaimed water has stable source and high nutrient content, and is widely used for greening irrigation and miscellaneous use. However, the coral sand has a larger permeability coefficient and weaker absorption to nitrogen, so that most of nitrogen in the reclaimed water is difficult to be utilized by plants and microorganisms along with water loss, and resource waste is caused. And the infiltration of nitrogen in reclaimed water can also cause pollution of fresh water lens bodies, thereby threatening the safety of water sources of combat readiness.
In order to properly reform the coral sand and cultivate a healthy coral sand ecological system, a general mode is to adopt control measures to enhance the interception effect of the coral sand on nitrogen, improve the content of nutrient substances such as nitrogen in the coral sand, control the risk of groundwater nitrogen pollution, and promote the efficient recycling of nitrogen in reclaimed water to cultivate the healthy coral sand ecological system.
At present, common soil nitrogen interception methods comprise two major types of physical nitrogen retention and biochemical nitrogen retention, but the two technologies are not suitable for coral sand soil by single application. Specifically, physical nitrogen retention changes the physical properties of soil through adding materials or engineering measures, so that the loss of nitrogen is effectively reduced, and the adding materials have the characteristics of porosity, large specific surface area and strong adsorptivity. Such as straw, biochar, water-retaining agent, etc., however, the physical nitrogen-retaining material cannot continue to be effective after adsorption saturation, and the long-term effectiveness is insufficient. The biochemical nitrogen retention mainly reduces nitrogen leaching loss by influencing the nitrogen circulation process, such as nitrification inhibitor, mainly inhibits the microbial activity of nitrifying bacteria in soil, and urease inhibitor, mainly inhibits the urease activity of soil, but the biochemical technology needs specific functional bacteria, but the reason for the nitrogen deficiency of coral sand is not the nitrification and denitrification function problem, and the problem of insufficient nitrogen interception of soil cannot be solved by adding the biochemical inhibitor due to insufficient total nitrogen content of the soil and poor microbial activity.
Disclosure of Invention
In view of the above, the present invention aims to provide a nitrate nitrogen-adsorbed soil conditioner and a combined application method with plants, wherein the absorption route of nitrogen is selected from the thick rattan suitable for growing in coral sand soil by combining physical and biochemical means, and the nitrogen is adsorbed by selecting a suitable soil conditioner, and simultaneously the growth of the thick rattan is promoted, so that the utilization rate of nitrogen in the coral sand soil is improved by a physical and biochemical combination method.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a nitrate nitrogen adsorption soil conditioner is characterized in that: the modifier comprises a biochar and coral sand modified matrix; the biochar accounts for 4% of the total mass of the coral sand modified matrix.
Further, the coral sand modified substrate is iron modified straw biochar, and the modification steps are as follows:
s1, carbonizing corn stalks in a nitrogen environment at 480-520 ℃ for 100-140 minutes to obtain biochar;
s2, crushing the biochar by using a crusher, sieving with a 2mm sieve, and adding FeCl 3 Oscillating for 110-130 min, filtering, transferring into beaker, and oven drying at 55-65deg.C for 22-26 hr;
s3, calcining the dried biochar in a tube furnace at 380-420 ℃ for 100-140 minutes, cooling to room temperature, leaching with ultrapure water to remove ash on the surface of the biochar, and filtering until the filtrate is clear and the pH value is constant;
s4, drying at 55-65 ℃ to constant weight for standby, and obtaining the modified biochar, which is marked as Fe-C.
Further, the biochar is combined with FeCl 3 The mass ratio of (2) is 1:10 (g: ml), the FeCl 3 Is 1mol/L.
Further, the method for applying the soil conditioner and the plant in a combined way comprises the following steps,
p1, mixing modified biochar and coral sand to obtain a matrix;
p2, paving a matrix on the surface of coral sand, wherein the thickness of the matrix is 10-15cm;
p3, planting the plant seedlings with the roots cleaned into a matrix.
Further, in the step P1, no nutrient soil remains at the roots of the plant seedlings, the plant height of the seedlings is 20-30cm, and the root length is 4-6cm.
Further, the young plant in the step P3 is 100cm 2 Density of seedlings planted in the matrix.
Further, after the seedlings are planted, clean water is adopted to irrigate coral sand.
The invention realizes the cultivation of coral sand and the efficient recycling of nitrogen, and has the following principle:
1. the modified biochar used in the invention is based on corn straw biochar, has higher porosity and can store more water. And after the iron is modified, the contents of Fe, C, O and other elements in the material are increased, the specific surface area and the phenolic hydroxyl content of the material are increased, and the adsorption capacity of nitrate nitrogen is further greatly enhanced. The plant is the thick vine, widely distributed in the tropical and subtropical coastal areas of the world, and researches show that the thick vine has a large number of adventitious roots, the stolon extends for 10m, is drought-resistant and salt-resistant, and can be used for fixing sand on beach or covering plants on roadsides, has higher gardening value and also has certain medicinal value.
2. The iron modified biochar in the matrix adsorbs nitrate nitrogen through physical and chemical actions, so that the nitrogen content in the soil is improved. The plant absorbs nitrate through the water and salt absorption effect of the root system, and takes the nitrate as a nutrient substance to meet the growth and development requirements of the plant. Compared with coral sand without the blending of biochar, the matrix has high organic matter content, good water holding performance and low pH value, and is favorable for promoting the growth of plant rootstock and the development of plant root soil microecology. The growth of plant root system can raise the water holding/absorbing capacity of the matrix layer and further raise the nitrogen intercepting effect of soil.
3. The incorporation of the modified biochar changes the water retention, pH and organic matter content of coral sand; the modified biochar is combined with the thick vine plants with multiple root systems to strengthen the interception capability of coral sand on nutrient substances such as nitrogen and moisture; the combined use of the two is beneficial to promoting the high-efficiency cyclic utilization of nitrogen and reducing the risk of groundwater nitrogen pollution, and is also beneficial to promoting the growth of plants, improving the microbial community structure and the microbial diversity, so that the coral sand ecological system is developed towards the healthy direction.
The invention has the beneficial effects that:
(1) After the method is adopted, the retention rate of the matrix layer on nitrate nitrogen in the reclaimed water is higher than 85% under different hydraulic impact loads; and compared with a pure coral sand group and an unmodified biochar group, the modified biochar mixed coral sand matrix can effectively promote plant growth and development and photosynthesis.
(2) The method of the invention is oriented to coral sand cultivation and nitrogen interception, and aims at the scenes of high permeability, low organic matter, high pH and difficult plant growth of coral sand, and the creatively provides a method for combining modified biochar with the thick vine of the sand-fixing plant to improve the nitrogen interception capability of coral sand and improve the circulation of coral sand substances.
(3) By FeCl 3 After modification, the adsorption capacity and the water retention property of the straw biochar are increased, and meanwhile, the iron element is required by plant growth and microorganism metabolism, so that the plant growth and the material circulation are promoted.
(4) The modified biochar material has wide sources, simple preparation and convenient application and operation. The plant is characterized by island, has low price, wide source, rapid growth and propagation, large single plant coverage area, and can realize island rapid greening and reduce water evaporation.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention clearer, the present invention provides the following drawings for explanation:
FIG. 1 is a schematic view of a planting structure according to the present invention;
FIG. 2 is a schematic view of the high elongation, chlorophyll content and plant weight of four different treated plants according to the present invention;
FIG. 3 is a schematic view showing the growth conditions of four plant root systems according to the present invention in different ways;
FIG. 4 is a schematic diagram showing the increase of organic matters, nitrate nitrogen, quick-acting phosphorus and quick-acting potassium content in the matrix soil of different treatment groups according to the invention.
The figures are marked as follows: 1. a substrate; 2. seedling; 3. coral sand.
Detailed Description
A nitrate nitrogen adsorption soil conditioner and a combined application method of the nitrate nitrogen adsorption soil conditioner and plants.
Example 1
Preparation of modified biochar (FeC-P (c)):
s1, carbonizing corn stalks for 120 minutes at 500 ℃ in a nitrogen environment to obtain biochar;
s2, crushing the biochar by using a crusher, sieving with a 2mm sieve, and adding FeCl 3 Shaking for 120 min, filtering, transferring into beaker, and oven drying at 60deg.C for 24 hr;
s3, calcining the dried biochar in a tube furnace at 400 ℃ for 120 minutes, cooling to room temperature, leaching with ultrapure water to remove ash on the surface of the biochar, and filtering until the filtrate is clear and the pH value is constant;
s4, drying at 60 ℃ to constant weight for later use to obtain the modified biochar material, which is marked as Fe-C.
The combined application method of the modifier and the plant comprises the following steps:
p1, mixing modified biochar and coral sand to obtain a matrix 1;
p2, paving the matrix 1 on the surface of coral sand 3, wherein the thickness is 12cm;
p3, planting the plant seedling 2 with the root cleaned in the matrix 1.
In order to demonstrate the superiority of the present invention, comparative examples 1 to 3 are set forth herein:
comparative example 1
Plants were grown in pure coral sand (P (a)):
p1, planting the plant seedlings 2 with the roots cleaned in pure coral sand.
Comparative example 2
Preparation of unmodified biochar (C-P (b)):
s1, under the nitrogen environment, corn straw is heated at 10 ℃ for min -1 Heating to 500 ℃ and carbonizing for 120 minutes;
s2, crushing the biochar by using a crusher, sieving by using a 2mm sieve, leaching by using water, and drying to obtain the unmodified biochar.
The application method of the combination of the unmodified biochar and the plant comprises the following steps:
p1, mixing unmodified biochar and coral sand to obtain a matrix 1;
p2, paving the matrix 1 on the surface of coral sand 3, wherein the thickness is 12cm;
p3, planting the plant seedling 2 with the root cleaned in the matrix 1.
Comparative example 3
Preparing modified biochar (magnesium modified biochar MgC-P (d)):
s1, carbonizing corn stalks for 120 minutes at 500 ℃ in a nitrogen environment to obtain biochar;
s2, crushing the biochar by using a crusher, sieving with a 2mm sieve, and adding FeCl 3 Shaking for 120 min, filtering, transferring into beaker, and oven drying at 60deg.C for 24 hr;
s3, calcining the dried biochar in a tube furnace at 400 ℃ for 120 minutes, cooling to room temperature, leaching with ultrapure water to remove ash on the surface of the biochar, and filtering until the filtrate is clear and the pH value is constant;
s4, drying at 60 ℃ to constant weight for later use to obtain the modified biochar material, which is marked as Fe-C.
The combined application method of the modifier (MgC-P (d)) and the plant comprises the following steps:
p1, mixing modified biochar and coral sand to obtain a matrix 1;
p2, paving the matrix 1 on the surface of coral sand 3, wherein the thickness is 12cm;
p3, planting the plant seedling 2 with the root cleaned in the matrix 1.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. A nitrate nitrogen adsorption soil conditioner is characterized in that: the modifier comprises a biochar and coral sand modified matrix; the biochar accounts for 4% of the total mass of the coral sand modified matrix.
2. A nitrate nitrogen-adsorbed soil conditioner according to claim 1, wherein: the coral sand modified substrate is iron modified straw biochar, and the modification steps are as follows:
s1, carbonizing corn stalks in a nitrogen environment at 480-520 ℃ for 100-140 minutes to obtain biochar;
s2, crushing the biochar by using a crusher, sieving with a 2mm sieve, and adding FeCl 3 Oscillating for 110-130 min, filtering, transferring into beaker, and oven drying at 55-65deg.C for 22-26 hr;
s3, calcining the dried biochar in a tube furnace at 380-420 ℃ for 100-140 minutes, cooling to room temperature, leaching with ultrapure water to remove ash on the surface of the biochar, and filtering until the filtrate is clear and the pH value is constant;
s4, drying at 55-65 ℃ to constant weight for standby, and obtaining the modified biochar, which is marked as Fe-C.
3. The soil conditioner according to claim 2, wherein: the biochar and FeCl 3 The mass ratio of (2) is 1:10 (g: ml), the FeCl 3 Is 1mol/L.
4. A nitrate nitrogen-adsorbed soil conditioner according to any of claims 1-3, further comprising a method of applying the soil conditioner in combination with plants, wherein: comprises the steps of,
p1, mixing modified biochar and coral sand to obtain a matrix;
p2, paving a matrix on the surface of coral sand, wherein the thickness of the matrix is 10-15cm;
p3, planting the plant seedlings with the roots cleaned into a matrix.
5. A method of applying a soil conditioner in combination with plants according to claim 3, wherein: in the step P1, no nutrient soil remains at the root of the plant seedling, the plant height of the seedling is 20-30cm, and the plant height is 4-6cm according to the length.
6. A method of applying a soil conditioner in combination with plants according to claim 3, wherein: the young plant in the step P3 is 100cm 2 Density of seedlings planted in the matrix.
7. A method of applying a soil conditioner in combination with plants according to claim 3, wherein: and after the seedlings are planted, the coral sand is irrigated by clear water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311769335.5A CN117844486A (en) | 2023-12-21 | 2023-12-21 | Nitrate nitrogen adsorption soil conditioner and combined application method of nitrate nitrogen adsorption soil conditioner and plants |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311769335.5A CN117844486A (en) | 2023-12-21 | 2023-12-21 | Nitrate nitrogen adsorption soil conditioner and combined application method of nitrate nitrogen adsorption soil conditioner and plants |
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