CN114853540A - Water-retaining slow-release fertilizer - Google Patents
Water-retaining slow-release fertilizer Download PDFInfo
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- CN114853540A CN114853540A CN202210389753.0A CN202210389753A CN114853540A CN 114853540 A CN114853540 A CN 114853540A CN 202210389753 A CN202210389753 A CN 202210389753A CN 114853540 A CN114853540 A CN 114853540A
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 87
- 229960000892 attapulgite Drugs 0.000 claims abstract description 61
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 26
- 239000011574 phosphorus Substances 0.000 claims abstract description 26
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 21
- 230000001580 bacterial effect Effects 0.000 claims abstract description 20
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920001807 Urea-formaldehyde Polymers 0.000 claims abstract description 12
- 239000004021 humic acid Substances 0.000 claims abstract description 12
- -1 urea formaldehyde compound Chemical class 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 20
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 12
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 241000894006 Bacteria Species 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 206010016807 Fluid retention Diseases 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000020477 pH reduction Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 241000192125 Firmicutes Species 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 239000002689 soil Substances 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 7
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 230000035558 fertility Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004720 fertilization Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003621 irrigation water Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/02—Fertilisers containing urea or urea compounds containing urea-formaldehyde condensates
-
- 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
- C05G3/80—Soil conditioners
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to the technical field of slow release fertilizers, and provides a water-retaining slow release fertilizer which comprises the following components in parts by weight: 30-80 parts of urea formaldehyde compound fertilizer, 14-22 parts of humic acid, 5-12 parts of granular phosphorus bacterial fertilizer, 30-35 parts of nonionic polyacrylamide and 15-21 parts of modified attapulgite. Through the technical scheme, the problem that the water absorption and retention capacity of the water-retaining agent is reduced when the water-retaining agent is mixed with the slow-release fertilizer is solved.
Description
Technical Field
The invention relates to the technical field of slow release fertilizers, in particular to a water-retaining slow release fertilizer.
Background
In the agricultural planting process, reasonable fertilization is required according to the product characteristics and the soil quality, and necessary nutrition of crops is supplemented in time to improve the soil property. The fertilizer is a substance which provides one or more nutrient elements necessary for plants, improves the soil property and improves the soil fertility level, and is one of the material bases of agricultural production. The slow release fertilizer is also called slow release fertilizer, is a new fertilizer variety developed in recent years, can replace part of functions of organic fertilizers, reduce the loss of nutrients in the fertilizers, improve the fertilizer efficiency and weaken the pollution of the fertilizers to soil.
The attapulgite is a natural 2:1 type water-containing magnesium-aluminum-rich silicate clay mineral with a chain layered structure, has a special nano rod-shaped crystal morphology and a regular one-dimensional nano pore channel structure, and is widely applied to the aspects of adsorption, energy storage, materials, biomedicine, agricultural production and the like. The attapulgite has special physical and chemical properties, has the capacities of adsorption, selectivity, cation exchange and the like, can improve the performance of soil so as to improve the water storage and fertilizer retention capacity of the soil, contains various mineral nutrient elements and trace elements, and can improve the yield of crops if the attapulgite is independently mixed with the soil. For a single fertilizer, after attapulgite is added, the absorption characteristic of the attapulgite can play a role in slow release and control on the fertilizer, thereby reducing the loss rate of the fertilizer, prolonging the acting time of the fertilizer on crops, improving the yield and obviously improving the yield of agricultural products.
The main component of the water-retaining agent is polyacrylamide which is a high molecular polymer with strong water absorption, when the water content is sufficient, the water-retaining agent can absorb and store the water to form colloid with strong water storage capacity, and when the water content in the surrounding environment is too low, the water stored in the colloid can be slowly released for the absorption of the root system of the surrounding plants, which is the principle of the application of the water-retaining agent polyacrylamide in agriculture. Besides the function of water retention, the polyacrylamide also has the functions of soil retention, fertilizer retention, yield increase, soil improvement and the like.
The reduction and the pollution of water resource, the fertilizer is used inappropriately etc. and is leaded to the fertility of soil to reduce, crops output descends and environmental pollution scheduling problem, in order to solve these problems, can use water-retaining agent and slow release fertilizer mixed traditionally, but new problem has appeared again in the use: when the water-retaining agent and the slow-release fertilizer are mixed for application, the swelling capacity of the water-retaining agent is easily reduced, and the water absorption and retention capacity is reduced.
Disclosure of Invention
The invention provides a water-retaining slow-release fertilizer, which solves the problem that when a water-retaining agent is mixed with a slow-release fertilizer for use, the water-retaining agent has reduced water-absorbing and water-retaining capacity.
The technical scheme of the invention is as follows: a water-retaining slow-release fertilizer comprises the following components in parts by weight: 30-80 parts of urea formaldehyde compound fertilizer, 14-22 parts of humic acid, 5-12 parts of granular phosphorus bacterial fertilizer, 30-35 parts of nonionic polyacrylamide and 15-21 parts of modified attapulgite.
As a further technical scheme, the granular phosphorus bacterial fertilizer is organic phosphorus bacteria or inorganic phosphorus bacteria.
As a further technical scheme, the organophosphorus bacteria are gram-positive bacteria.
As a further technical scheme, the inorganic phosphorus bacteria are gram-negative bacteria.
As a further technical scheme, the raw materials of the modified attapulgite comprise acidified attapulgite and polyaluminum ferric chloride, and the mass-to-volume ratio of the acidified attapulgite to the polyaluminum ferric chloride is 1: 3.
As a further technical scheme, the preparation method of the modified attapulgite comprises the following steps:
step A, sample preparation: cleaning the surface of attapulgite-containing mineral, air drying, pulverizing the air dried mineral, pulverizing the mineral, and sieving with 200 mesh sieve to obtain attapulgite sample;
step B, acidification: putting a certain amount of attapulgite sample into a stirring device, adding dilute hydrochloric acid into the stirring device, wherein the mass-to-volume ratio of the attapulgite sample to the dilute hydrochloric acid is 1:5, fully stirring for 1-1.2h, standing for 12h, separating out solid substances in the stirring device, repeatedly washing the solid substances for 3-5 times by using deionized water, drying and vibrating to obtain acidified attapulgite;
step C, modification: putting a certain amount of acidified attapulgite into a reaction vessel, adding polyaluminum ferric chloride into the reaction vessel, wherein the mass-to-volume ratio of the acidified attapulgite to the polyaluminum ferric chloride is 1:3, adding a certain amount of deionized water, the mass-to-volume ratio of the acidified attapulgite to the deionized water is 1:10, fully stirring for 10-20min, heating the reaction vessel, stirring for 12h at 65-70 ℃, standing for 12h, performing solid-liquid separation after standing, drying and vibrating the separated solid, and the dried substance is modified attapulgite.
As a further technical scheme, in the step B, the amount concentration of the dilute hydrochloric acid is 2-4 mol/L.
As a further technical scheme, in the step C, the mass fraction of the polyaluminum ferric chloride is 10-15%.
The water-retaining slow-release fertilizer provided by the invention has the following effective effects:
1. the water-retaining agent can absorb water, so that the water is always supplied in the process of continuously releasing the fertility of the slow release fertilizer, and the problem of seedling burning is avoided; the nonionic polyacrylamide can absorb impurities in water in the fertilization and watering process, part of the nonionic polyacrylamide can precipitate flocculate in the water, and the other part of the nonionic polyacrylamide can absorb relatively pure water; the modified attapulgite has strong adsorbability, can adsorb flocculate, and can further improve the water absorption and retention capacity of the nonionic polyacrylamide by fixing the flocculate;
2. the urea formaldehyde compound fertilizer provides necessary nitrogen, phosphorus and potassium elements for plant growth, humic acid can regulate and increase the fertility and ecological balance of soil, the granular phosphorus bacterial fertilizer comprises an organic granular phosphorus bacterial fertilizer and an inorganic granular phosphorus bacterial fertilizer, wherein the organic granular phosphorus bacterial fertilizer can decompose organic phosphide in the slow-release fertilizer, the inorganic granular phosphorus bacterial fertilizer can dissolve the inorganic phosphide into phosphide capable of being absorbed and utilized by plants, and the granular phosphorus bacterial fertilizer is matched with the use of urea formaldehyde and humic acid, so that the utilization rate of the fertilizer can be improved to the greatest extent, and the waste of the fertilizer is reduced; the use of the granular phosphorus bacterial fertilizer improves the absorption of inorganic state phosphide and prolongs the whole release period of fertility;
3. the modified attapulgite has larger specific surface area, has good ion exchange capacity due to rich void structure, and can absorb heavy metals in soil through adsorption; heavy metals are inevitably introduced into the soil in the use process of humic acid, and the modified attapulgite is added into the slow release fertilizer, so that the influence of the heavy metals on the absorption of nitrogen, phosphorus and potassium elements by plants can be reduced; because the heavy metal is absorbed by the attapulgite, the moisture in the water-retaining agent can be supplied to the plants to the maximum extent;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 relate to the scope of protection of the present invention.
Example 1
The water-retaining slow-release fertilizer provided by the embodiment comprises the following components in parts by weight: 80 parts of urea formaldehyde compound fertilizer, 22 parts of humic acid, 5 parts of granular phosphorus bacterial fertilizer, 35 parts of nonionic polyacrylamide and 21 parts of modified attapulgite.
The preparation method of the modified attapulgite comprises the following steps:
step A, sample preparation: cleaning the surface of attapulgite-containing mineral, air drying, pulverizing the air dried mineral, pulverizing the mineral, and sieving with 200 mesh sieve to obtain attapulgite sample;
step B, acidification: putting a certain amount of attapulgite sample into a stirring device, adding dilute hydrochloric acid into the stirring device, wherein the mass-to-volume ratio of the attapulgite sample to the dilute hydrochloric acid is 1:5, fully stirring for 1-1.2h, standing for 12h, separating out solid substances in the stirring device, repeatedly washing the solid substances for 3-5 times by using deionized water, drying and vibrating to obtain acidified attapulgite;
step C, modification: putting a certain amount of acidified attapulgite into a reaction vessel, adding polyaluminum ferric chloride into the reaction vessel, wherein the mass-to-volume ratio of the acidified attapulgite to the polyaluminum ferric chloride is 1:3, adding a certain amount of deionized water, the mass-to-volume ratio of the acidified attapulgite to the deionized water is 1:10, fully stirring for 10-20min, heating the reaction vessel, stirring for 12h at 65-70 ℃, standing for 12h, performing solid-liquid separation after standing, drying and vibrating the separated solid, and the dried substance is modified attapulgite.
Wherein the urea formaldehyde compound fertilizer is purchased from Kate fertilizer Co.Ltd in Shandong; the effective viable count of the organophosphorus bacterial fertilizer is more than or equal to 0.5 hundred million/g, and the effective viable count of the inorganic phosphorus bacterial fertilizer is more than or equal to 0.5 hundred million/g.
Example 2
The water-retaining slow-release fertilizer provided by the embodiment comprises the following components in parts by weight: 30 parts of urea formaldehyde compound fertilizer, 14 parts of humic acid, 5 parts of granular phosphorus bacterial fertilizer, 30 parts of nonionic polyacrylamide and 15 parts of modified attapulgite.
The preparation method of the modified attapulgite is the same as that of example 1.
Example 3
The water-retaining slow-release fertilizer provided by the embodiment comprises the following components in parts by weight: 50 parts of urea formaldehyde compound fertilizer, 18 parts of humic acid, 8 parts of granular phosphorus bacterial fertilizer, 33 parts of nonionic polyacrylamide and 18 parts of modified attapulgite.
The preparation method of the modified attapulgite is the same as that of example 1.
Example 4
The water-retaining slow-release fertilizer provided by the embodiment comprises the following components in parts by weight: 75 parts of urea formaldehyde compound fertilizer, 20 parts of humic acid, 12 parts of granular phosphorus bacterial fertilizer, 33 parts of nonionic polyacrylamide and 20 parts of modified attapulgite.
The preparation method of the modified attapulgite is the same as that of example 1.
Comparative example 1
The water-retaining slow-release fertilizer provided by the comparative example comprises the following components in parts by weight: 80 parts of urea formaldehyde compound fertilizer, 22 parts of humic acid, 5 parts of granular phosphorus bacterial fertilizer and 35 parts of nonionic polyacrylamide.
Comparative example 2
The water-retaining slow-release fertilizer provided by the comparative example comprises the following components in parts by weight: 80 parts of urea formaldehyde compound fertilizer, 22 parts of humic acid, 5 parts of granular phosphorus bacterial fertilizer and 21 parts of modified attapulgite.
The preparation method of the modified attapulgite is the same as that of example 1.
Firstly selecting the King Song village and the northern rock village in Yuanshi county of Shijiazhuang city, secondly selecting the irrigation water and the soil in the two regions, and finally respectively dissolving the water-retaining slow-release fertilizer in 4 examples and 2 comparative examples, wherein the weight of the soil is 1 kg, the irrigation water is 2 liters, and the fertilizer is 200 g. Detecting the content of heavy metals in the soil according to the national standard GB/T22105.2-2008 and preparing a table, wherein the prepared table is table 1; detecting the water content of the soil according to the national standard GB/T33705-2017 and preparing a table, wherein the prepared table is a table 2;
the sampling method in the King Song village and the North rock village is as follows:
s10, respectively sampling soil of agricultural lands of the Wangsong village and the North rock village, sequentially marking a No. 1 sample and a No. 2 sample, fully stirring the No. 1 sample, uniformly dividing into 6 parts, sequentially marking 1-1, 1-2 and … … 1-6, and similarly obtaining 2-1, 2-2 and … … 2-6;
s20, in the middle watering period of the spring farming field, taking the watering water of the Wang Song village and the North rock village, marking the watering water as a No. 3 sample and a No. 4 sample in sequence, fully stirring the No. 3 sample, dividing the sample into 6 parts, marking the parts as 3-1, 3-2 and … … 3-6 in sequence, and obtaining 4-1, 4-2 and … … 4-6 in the same way;
s30, scattering the slow release fertilizer in the embodiment 1 into samples 1-1 and 2-1, and correspondingly adding the samples 3-1 and 4-1 to obtain final samples W1 and B1; the slow release fertilizer in example 2 was scattered into samples 1-2 and 2-2, and samples 3-2 and 4-2 were added correspondingly to obtain final samples W2 and B2; the slow release fertilizer in example 3 was scattered into samples 1-3 and 2-3, and samples 3-3 and 4-3 were added correspondingly to obtain final samples W3 and B3; the slow release fertilizer in example 4 was scattered into samples 1-4 and 2-4, and samples 3-4 and 4-4 were added correspondingly to obtain final samples W4 and B4; the slow release fertilizer in comparative example 1 was scattered into samples 1-5 and 2-5 and correspondingly added into samples 3-5 and 4-5 to obtain final samples W5 and B5; the slow release fertilizer in comparative example 2 was scattered into samples 1-6 and 2-6 and correspondingly added to samples 3-6 and 4-6 to obtain final samples W6 and B6;
and step S40, after standing for one week under natural conditions, respectively measuring the content and the water content of heavy metal As in the soil, and filling tables 1 and 2.
Table 1 is as follows: the units of As content are: mg/kg
| W1 | W2 | W3 | W4 | W5 | W6 | B1 | B2 | B3 | B4 | B5 | B6 | |
| Content of As | 8.3 | 6.1 | 6.6 | 8.7 | 16.2 | 24.3 | 9.5 | 11.4 | 10.7 | 8.8 | 22.1 | 20.9 |
Table 2 is as follows:
in summary, it can be seen from table 1 that the As element in the soil is adhered to the modified attapulgite, and the compatibility of the modified attapulgite and the nonionic polyacrylamide improves the adsorption capacity of the whole body to the As, because the floc generated by the nonionic polyacrylamide can be easily adsorbed in the pores of the modified attapulgite and is not easy to be separated from the pores.
As can be seen from Table 2, the nonionic polyacrylamide has excellent water retention, and after the modified attapulgite is compounded, because floccules formed by a part of the nonionic polyacrylamide have a cleaning effect on water drops, the other part of the nonionic polyacrylamide can adsorb the clean water drops, so that the water absorption and the water retention of the nonionic polyacrylamide are ensured.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The water-retaining slow-release fertilizer is characterized by comprising the following components in parts by weight: 30-80 parts of urea formaldehyde compound fertilizer, 14-22 parts of humic acid, 5-12 parts of granular phosphorus bacterial fertilizer, 30-35 parts of nonionic polyacrylamide and 15-21 parts of modified attapulgite.
2. The water-retention slow-release fertilizer according to claim 1, wherein the granular phosphorus bacterial fertilizer is organophosphorus bacteria or inorganic phosphorus bacteria.
3. The water-retaining slow-release fertilizer according to claim 2, wherein the organophosphorus bacteria are gram-positive bacteria.
4. The water-retaining slow-release fertilizer according to claim 2 or 3, wherein the inorganic phosphorus bacteria are gram-negative bacteria.
5. The water-retaining slow-release fertilizer as claimed in claim 1, wherein the modified attapulgite comprises acidified attapulgite and polyaluminum ferric chloride, and the mass-to-volume ratio of the acidified attapulgite to the polyaluminum ferric chloride is 1: 3.
6. The water-retention slow-release fertilizer according to claim 5, wherein the preparation method of the modified attapulgite comprises the following steps:
step A, sample preparation: cleaning the surface of attapulgite-containing mineral, air drying, pulverizing the air dried mineral, pulverizing the mineral, and sieving with 200 mesh sieve to obtain attapulgite sample;
step B, acidification: putting a certain amount of attapulgite sample into a stirring device, adding dilute hydrochloric acid into the stirring device, wherein the mass-to-volume ratio of the attapulgite sample to the dilute hydrochloric acid is 1:5, fully stirring for 1-1.2h, standing for 12h, separating out solid substances in the stirring device, repeatedly washing the solid substances for 3-5 times by using deionized water, drying and vibrating to obtain acidified attapulgite;
step C, modification: putting a certain amount of acidified attapulgite into a reaction vessel, adding polyaluminum ferric chloride into the reaction vessel, wherein the mass-to-volume ratio of the acidified attapulgite to the polyaluminum ferric chloride is 1:3, adding a certain amount of deionized water, the mass-to-volume ratio of the acidified attapulgite to the deionized water is 1:10, fully stirring for 10-20min, heating the reaction vessel, stirring for 12h at 65-70 ℃, standing for 12h, performing solid-liquid separation after standing, drying and vibrating the separated solid, and the dried substance is modified attapulgite.
7. The water-retention slow-release fertilizer according to claim 6, wherein in the step B, the amount concentration of the dilute hydrochloric acid is 2-4 mol/L.
8. The water-retention slow-release fertilizer according to claim 6, wherein in the step C, the mass fraction of the polyaluminum ferric chloride is 10-15%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210389753.0A CN114853540A (en) | 2022-04-14 | 2022-04-14 | Water-retaining slow-release fertilizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210389753.0A CN114853540A (en) | 2022-04-14 | 2022-04-14 | Water-retaining slow-release fertilizer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1781982A (en) * | 2004-12-02 | 2006-06-07 | 中国科学院兰州化学物理研究所 | Organic-inorganic composite water retaining agent with fertilizer slow release function and its preparing method |
| CN103193552A (en) * | 2013-04-25 | 2013-07-10 | 焦楠 | Complex water-retaining synergistic chemical fertilizer |
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