CN110436997A - Compound fertilizer and its preparation method and application - Google Patents
Compound fertilizer and its preparation method and application Download PDFInfo
- Publication number
- CN110436997A CN110436997A CN201910740589.1A CN201910740589A CN110436997A CN 110436997 A CN110436997 A CN 110436997A CN 201910740589 A CN201910740589 A CN 201910740589A CN 110436997 A CN110436997 A CN 110436997A
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- CN
- China
- Prior art keywords
- compound fertilizer
- brassin lactones
- ammonium nitrate
- parts
- lactones
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/005—Following a specific plan, e.g. pattern
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/05—Fruit crops, e.g. strawberries, tomatoes or cucumbers
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/15—Leaf crops, e.g. lettuce or spinach
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C1/00—Ammonium nitrate fertilisers
-
- 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
Abstract
The present invention relates to a kind of compound fertilizers.In terms of mass fraction, which includes 98.99 parts~99.97 parts of calcium ammonium nitrate, 0.01 part~1 part of middle microelement and 0.000001 part~0.000006 part of brassin lactones.The compound fertilizer can be improved the quality of crops, and improve the yield of crops.
Description
Technical field
The present invention relates to agricultural technology field, in particular to a kind of compound fertilizer and its preparation method and application.
Background technique
With the development of science and technology improvement of living standard, people are also higher and higher for the quality requirements of crops.
Calcium ammonium nitrate can not only be directly absorbed by crops as nitrate fertilizer, and it is high with utilization rate, pH value is suitable
Medium advantage.But the advantage that current calcium ammonium nitrate improves the quality of crops is unobvious.And it can be improved agriculture using other
When the fertilizer of the quality of crop plants crops, the yield of crops is often relatively low.
Summary of the invention
Based on this, it is necessary to provide a kind of compound fertilizer of quality and yield that can be improved crops.
In addition, also providing a kind of preparation method of the compound fertilizer of quality and yield that can be improved crops.
A kind of compound fertilizer, in terms of mass fraction, comprising:
98.99 parts~99.97 parts of calcium ammonium nitrate；
0.01 part~1 part of middle microelement；And
0.000001 part~0.000006 part of brassin lactones.
Above-mentioned compound fertilizer includes calcium ammonium nitrate, middle microelement and additive, wherein additive includes in brassin
Rouge.Brassin lactones and middle microelement and calcium ammonium nitrate cooperate in above-mentioned compound fertilizer, enable above-mentioned compound fertilizer
Enough improve the quality and yield of crops.
The brassin lactones is in the high brassin lactones of 28- table, 28- high brassin in one of the embodiments,
Rouge, 24- table brassin lactones and 24- mix at least one of table brassin lactones.
The compound fertilizer further includes additive in one of the embodiments, and the additive includes surfactant
And at least one of cosolvent.
The number of the additive is 0.009999 part~0.029999 part in one of the embodiments,.
The mass percentage of the nitrate nitrogen of the calcium ammonium nitrate is 15%~20% in one of the embodiments,.
The mass percentage of water-soluble calcium is 18%~20% in the calcium ammonium nitrate in one of the embodiments,.
In one of the embodiments, the raw material of the middle microelement include in magnesium nitrate, zinc nitrate and boric acid extremely
Few one kind.
In one of the embodiments, in terms of mass fraction, above-mentioned compound fertilizer includes:
98.99 parts~99.9 parts of calcium ammonium nitrate；
0.07 part~1 part of middle microelement；And
0.000001 part~0.000006 part of brassin lactones；
Wherein, the brassin lactones is 28- high brassin lactones.
A kind of preparation method of compound fertilizer, comprising the following steps:
In terms of mass fraction, 98.99 parts~99.97 parts of calcium ammonium nitrate and 0.01 part~1 part of middle microelement are mixed
It closes, obtains mixture；And
Under the conditions of 55 DEG C~65 DEG C, 0.000001 part~0.000006 part of brassin lactones is mixed with the mixture
It closes, obtains the compound fertilizer.
The compound fertilizer that the preparation method of above-mentioned compound fertilizer or above-mentioned compound fertilizer is prepared is in plantation tomato, strawberry
Or the application in green vegetables.
Specific embodiment
It to facilitate the understanding of the present invention, below will be to invention is more fully described.The present invention can be with many not
With form realize, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes this hair
Bright disclosure is more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
The compound fertilizer of one embodiment, in terms of mass fraction, comprising:
98.99 parts~99.97 parts of calcium ammonium nitrate；
0.01 part~1 part of middle microelement；And
0.0001 part~0.0006 part of brassin lactones.
Calcium ammonium nitrate can not only be directly absorbed by crops as nitrate fertilizer, but also high-efficiency environment friendly.Further, nitric acid
The number of ammonium calcium is 98.99 parts~99.9 parts.
The mass percentage of the nitrate nitrogen of calcium ammonium nitrate is 15%~20% in one of the embodiments,.Further
Ground, the mass percentage of the nitrate nitrogen of calcium ammonium nitrate are 15%, 16% or 17%.
The mass percentage of water-soluble calcium is 18%~20% in calcium ammonium nitrate in one of the embodiments,.Into one
Step ground, the mass percentage of the water-soluble calcium of calcium ammonium nitrate are 18%, 18.5% or 19%.
Middle microelement can be the form of inorganic salts, be also possible to the form of Chelating state.Further, middle microelement
Raw material be selected from least one of magnesium nitrate, zinc nitrate and boric acid.
The raw material of middle microelement is selected from one of magnesium nitrate, zinc nitrate and boric acid in one of the embodiments,.Choosing
The raw material of one of magnesium nitrate, zinc nitrate and boric acid microelement as in is selected, can preferably be cooperated with other components.In
The number of microelement is 0.01 part~1 part.Further, the number of middle microelement is 0.02 part, 0.07 part or 0.5
Part.
Brassin lactones can preferably cooperate with other components, improve the sugariness and ascorbic content of fruit, and
It also can increase the yield of fruit.Further, brassin lactones be selected from the high brassin lactones of 28- table, 28- high brassin lactones,
24- table brassin lactones and 24- mix at least one of table brassin lactones.Preferably, brassin lactones is selected from 28- table Gao Yun
Tongue fur element lactones, 28- high brassin lactones, 24- table brassin lactones and 24- mix one of table brassin lactones.Further
Ground, brassin lactones are 28- high brassin lactones.
The number of brassin lactones is 0.000001 part~0.000006 part in one of the embodiments,.It that is to say, rue
Mass content of the tongue fur element lactones in above-mentioned compound fertilizer is 0.01ppm~0.06ppm.Herein, ppm is the percentage of quality
Rate, 1ppm expression refer to hundred a ten thousandths.When the number of brassin lactones is 0.000001 part~0.000006 part, compound fertilizer
It can be improved the anti-adversity ability of crop.Further, the number of brassin lactones be 0.000001 part, 0.000002 part or
0.000006 part.
Compound fertilizer further includes additive in one of the embodiments,.Further, additive includes surfactant
And at least one of cosolvent.Further, the number of additive is 0.009999 part~0.029999 part.Brassin lactones
Number and the sum of the number of additive be 0.01 part~0.03 part.
Further, additive is powdery.At this point, additive includes surfactant and filler.Further, surface
Activating agent is selected from least one of quaternary ammonium glycocide surfactant and organic silicon surfactant.Filler is selected from talcum powder and silicon
One of diatomaceous earth.Certainly, in some other embodiment, surfactant can also be other surfaces commonly used in the art
Activating agent is not listed one by one herein.The number of surfactant is 0.00005 part~0.0002 part, and the number of filler is
0.00949 part~0.029944 part.
In another embodiment, additive is liquid, and additive includes cosolvent.Preferably, cosolvent is selected from acetic acid
At least one of ethyl ester, water and ethyl alcohol.Certainly, in some other embodiment, cosolvent can also be that other can be molten
The solvent for solving brassin lactones, is not listed one by one herein.
Mass fraction meter in one of the embodiments, compound fertilizer are composed of the following components:
Wherein, additive includes at least one of surfactant and cosolvent；The quality of the nitrate nitrogen of calcium ammonium nitrate
Percentage composition is 15%~20%, and the mass percentage of the water-soluble calcium of calcium ammonium nitrate is 18%~20%.
In one of the embodiments, in terms of mass fraction, compound fertilizer includes:
Wherein, brassin lactones is 28- high brassin lactones；The mass percentage of the nitrate nitrogen of calcium ammonium nitrate is 15%
~16%, the mass percentage of the water-soluble calcium of calcium ammonium nitrate is 18%~19%.
Above-mentioned compound fertilizer includes calcium ammonium nitrate, middle microelement and additive, wherein additive includes in brassin
Rouge.Each component in above-mentioned compound fertilizer cooperates, so that above-mentioned compound fertilizer can be improved the quality and yield of crops.
Verified, above-mentioned compound fertilizer can be improved the soluble sugar content, calcium content and ascorbic content of crops, and will
The output increased 9.5%~16.7% of crops.
The preparation method of above-mentioned compound fertilizer, including step S110~step S130.
Step S110, calcium ammonium nitrate and middle microelement are mixed, obtains mixture.
In terms of mass fraction, 98.99 parts~99.97 parts of calcium ammonium nitrate and 0.01 part~1 part of middle microelement are mixed
It closes, obtains mixture.Mixed mode is to be stirred.
Further, further include the steps that for mixture being granulated, mixture is prepared into graininess.Further
Ground, the partial size of granular mixture are 1.0mm~6.0mm.
Step S130, under the conditions of 55 DEG C~65 DEG C, by 0.000001 part~0.000006 part brassin lactones with mix
Object mixing, obtains compound fertilizer.
Specifically, under the conditions of 55 DEG C~65 DEG C, by 0.000001 part~0.000006 part brassin lactones and mixture
Mixing, obtains compound fertilizer.Further, under the conditions of 55 DEG C~60 DEG C, by 0.000001 part~0.000006 part brassin
Lactones sprays to mixture surface, obtains compound fertilizer.
One embodiment wherein, by 0.0001 part~0.0002 part brassin lactones and 0.009999 part~0.029999
Part cosolvent mixing, obtains precoat, then under the conditions of 55 DEG C~65 DEG C, precoat is sprayed to mixture surface, is obtained
Compound fertilizer.
In another embodiment, by 0.00001 part~0.0001 part brassin lactones, 0.00005 part~0.0002 part
Surfactant and 0.000949 part~0.029944 part filler mixing, obtain precoat, then under the conditions of 55 DEG C~65 DEG C,
Precoat is sprayed into mixture surface, obtains compound fertilizer.
The preparation method of above-mentioned compound fertilizer is simple and direct, is convenient for industrialized production.
Application of the above-mentioned compound fertilizer in plantation tomato, strawberry or green vegetables.
Specifically, green vegetables refer to green vegetable, such as Brassica rapa L, cabbage heart, Chinese little greens.
When planting tomato, strawberry, green vegetables, the quality and yield of fruit can be improved using above-mentioned compound fertilizer.
The application method of above-mentioned compound fertilizer, comprising the following steps:
According to plant growth characteristic, above-mentioned compound fertilizer is used in crops seedling stage, period of blooming.
Specifically, the method for application of above-mentioned compound fertilizer is foliage-spray.Extension rate when spraying is 700 times~1000
Times.Spraying time selected at the calm cloudy day；Or when humidity is big, evaporation the is small morning 9 before or when afternoon 4 after.If spray
Rain is met after applying, and need to added once.
Further, the above-mentioned compound fertilizer after dilution sprays application to blade, the stalk in the upper, middle and lower portion of plant, and with
Subject to vacuum side of blade uniformly moistens.
Further, when vigorous period, the fertilization mode of above-mentioned compound fertilizer is that foliage-spray and root fertilising are tied
It closes.Root fertilising include cave apply, spread fertilizer over the fields, ditch spread.10,000 grams/acre~20,000 grams/acre of ampoule of root fertilising.
According to application method plantation tomato, strawberry or the green vegetables of above-mentioned compound fertilizer, it can be improved tomato, strawberry or green vegetables
Quality and yield.
Specific embodiment
It is described in detail below in conjunction with specific embodiment.In embodiment if not otherwise indicated using drug and instrument,
For this field conventional selection.Test method without specific conditions in embodiment, according to normal conditions, such as document, books
Described in condition or manufacturer recommend method realize.Number in following embodiment refers both to mass fraction.
1~embodiment of embodiment 6
(1) calcium ammonium nitrate, middle microelement and precoat of the compound fertilizer of each embodiment are weighed according to table 1.Wherein:
The precoat of embodiment 1 is by 28- high brassin lactones, polyquaternium fungicide CB-2133 (more U.S. are more) and diatom
Local soil type at.Wherein, mass percentage of the 28- high brassin lactones in precoat is 0.01%, polyquaternium fungicide CB-
2133 mass percentage in precoat is 2%, remaining is diatomite.Therefore, 28- high in the compound fertilizer of embodiment 1
The number of brassin lactones is 0.000001 part, i.e. 28- high brassin lactones is in the content of the compound fertilizer of embodiment 1
0.01ppm。
By 28- high brassin lactones, polyether-modified trisiloxanes, (Jiande City's polymerized new material has the precoat of embodiment 2
Limit company) and diatomite composition.Wherein, mass percentage of the 28- high brassin lactones in precoat is 0.02%, polyethers
Mass percentage of the modified trisiloxanes in precoat is 2%, remaining is diatomite.Therefore, the compound fertilizer of embodiment 2
The number of middle 28- high brassin lactones is 0.000006 part.I.e. 28- high brassin lactones contains in the compound fertilizer of embodiment 2
Amount is 0.06ppm.
The precoat of embodiment 3 is made of 28- high brassin lactones and ethyl acetate.Wherein, 28- high brassin lactones exists
Mass percentage in precoat is 0.01%, remaining is ethyl acetate.Therefore, 28- Gao Yun in the compound fertilizer of embodiment 3
Tongue fur element lactones number be 0.000002 part.I.e. 28- high brassin lactones is in the content of the compound fertilizer of embodiment 3
0.02ppm。
The precoat of embodiment 4 is mixed table brassin lactones, polyether-modified trisiloxanes and diatomite by 24- and is formed.Wherein,
Mass percentage of the 24- high brassin lactones in precoat is 0.02%, and polyether-modified trisiloxanes is in precoat
Mass percentage is 2%, remaining is diatomite.Therefore, in the compound fertilizer of embodiment 4 28- high brassin lactones number
It is 0.000006 part.I.e. 28- high brassin lactones is 0.06ppm in the content of the compound fertilizer of embodiment 4.
The precoat of embodiment 5 is made of indolebutyric acid (IBA), polyquaternium fungicide CB-2133 and diatomite.Its
In, mass percentage of the indolebutyric acid in precoat is 0.01%, and polyquaternium fungicide CB-2133 is in precoat
Mass percentage is 2%, remaining is diatomite.Therefore, the number of indolebutyric acid is in the compound fertilizer of embodiment 5
0.000001 part, i.e. indolebutyric acid is 0.01ppm in the content of the compound fertilizer of embodiment 5.
The precoat of embodiment 6 is by 28- high brassin lactones, polyquaternium fungicide CB-2133 (more U.S. are more) and diatom
Local soil type at.Wherein mass percentage of the 28- high brassin lactones in precoat is 1%, polyquaternium fungicide CB-2133
Mass percentage in precoat is 2%, remaining is diatomite.Therefore, 28- high rape in the compound fertilizer of embodiment 6
The number of plain lactones is 0.0001 part, i.e., 28- high brassin lactones is 1ppm in the content of the compound fertilizer of embodiment 6.
Table 1
(2) calcium ammonium nitrate of each embodiment and middle microelement are mixed respectively, is granulated, obtains the mixing of each embodiment
Object.The average grain diameter of the mixture of embodiment 1 is 4mm；The average grain diameter of the mixture of embodiment 2 is 4mm；Embodiment 3 is mixed
The average grain diameter for closing object is 6mm；The average grain diameter of the mixture of embodiment 4 is 4mm；The mixture of embodiment 5 and embodiment 6
Average grain diameter is 4mm.
(3) dry-heat air is each led into the mixture of each embodiment, so that the surface of each mixture is warming up to 60 DEG C,
Then corresponding precoat is sprayed to the mixture of each embodiment, obtains the compound fertilizer of each embodiment.
(4) to plant the fertilizer efficiency of the compound fertilizer for each embodiment that tomato, strawberry and Brassica rapa L verification step (3) obtain.
Wherein:
3 control groups are set up, control group 1~3 is named as.1 kind of plant Brassica rapa L of control group 1 and embodiment, control group 1 are made
Compound fertilizer it is roughly the same with embodiment 1, difference is, in the additive of the compound fertilizer of control group 1 be free of 28-
High brassin lactones, contains only polyquaternium fungicide CB-2133 and diatomite.Control group 2 is identical with 2 varieties of plant of embodiment
The compound fertilizer of strawberry, control group 2 is roughly the same with embodiment 2, and difference is, the additive of the compound fertilizer of control group 2
In be free of 28- high brassin lactones, contain only polyether-modified trisiloxanes and diatomite.Control group 3 and the various kind phases of embodiment 3
Same tomato, the compound fertilizer of control group 3 is roughly the same with embodiment 3, and difference is, the compound fertilizer of control group 3 is free of
28- high brassin lactones, contains only ethyl acetate.
The period that embodiment 1, embodiment 5, embodiment 6 and control group 1 spray corresponding compound fertilizer is the vigorous life of Brassica rapa L
For a long time, sprinkling number is 1 time, and each fountain height is 8,000 grams/acre.Embodiment 1, control group 2 and the sprinkling correspondence of embodiment 4 are compound
The period of fertilizer is the period of blooming of strawberry, and sprinkling number is 1 time, and each fountain height is 10,000 grams/acre.Embodiment 3 and control
The periods that group 3 sprays corresponding compound fertilizer are blooming the period phase for tomato, and sprinkling number is 1 time, each fountain height is 10 kilograms/
Mu.
Harvesting: harvesting crops corresponding to the compound fertilizer of each embodiment and the corresponding crops of control group respectively, and
It weighs respectively, calculates the yield and yield increase rate of each embodiment.
Detection: using the calcium and 2,6 1 dichloroindophenol titrations difference in saccharometer, aas determination vegetables
Detect the soluble sugar content, calcium content, ascorbic content of crops corresponding to each embodiment and control group.As a result such as
Shown in table 2.
Table 2
As can be seen from Table 2, the sugared content of the crops of 1~embodiment of embodiment 4, calcium content and ascorbic content
And yield is above control group.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of compound fertilizer, which is characterized in that in terms of mass fraction, comprising:
98.99 parts~99.97 parts of calcium ammonium nitrate；
0.01 part~1 part of middle microelement；And
0.000001 part~0.000006 part of brassin lactones.
2. compound fertilizer according to claim 1, which is characterized in that the brassin lactones is selected from the high brassin of 28- table
Lactones, 28- high brassin lactones, 24- table brassin lactones and 24- mix at least one of table brassin lactones.
3. compound fertilizer according to claim 1, which is characterized in that the compound fertilizer further includes additive, described to add
Adding agent includes at least one of surfactant and cosolvent.
4. compound fertilizer according to claim 3, which is characterized in that the number of the additive be 0.009999 part~
0.029999 part.
5. compound fertilizer according to claim 1, which is characterized in that the quality percentage of the nitrate nitrogen of the calcium ammonium nitrate contains
Amount is 15%~20%.
6. compound fertilizer according to claim 1, which is characterized in that the quality percentage of water-soluble calcium in the calcium ammonium nitrate
Content is 18%~20%.
7. compound fertilizer according to claim 1, which is characterized in that the raw material of the middle microelement include magnesium nitrate,
At least one of zinc nitrate and boric acid.
8. compound fertilizer according to claim 1, which is characterized in that in terms of mass fraction, comprising:
98.99 parts~99.9 parts of calcium ammonium nitrate；
0.07 part~1 part of middle microelement；And
0.000001 part~0.000006 part of brassin lactones；
Wherein, the brassin lactones is 28- high brassin lactones.
9. a kind of preparation method of compound fertilizer, which comprises the following steps:
In terms of mass fraction, 98.99 parts~99.97 parts of calcium ammonium nitrate and 0.01 part~1 part of middle microelement are mixed, obtained
To mixture；And
Under the conditions of 55 DEG C~65 DEG C, 0.000001 part~0.000006 part of brassin lactones is mixed with the mixture,
Obtain the compound fertilizer.
10. the preparation method system of compound fertilizer according to any one of claims 1 to 8 or compound fertilizer as claimed in claim 9
Application of the standby obtained compound fertilizer in plantation tomato, strawberry or green vegetables.
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| CN110074114A (en) * | 2019-04-29 | 2019-08-02 | 天津市汉邦植物保护剂有限责任公司 | A kind of brassinolide-containing, aqua of sugar alcohol calcium and preparation method and application |
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2019
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| US20180134633A1 (en) * | 2015-05-12 | 2018-05-17 | Basf Se | Thioether compounds as nitrification inhibitors |
| CN106358644A (en) * | 2016-08-23 | 2017-02-01 | 郭强 | Tomato production method and antimicrobial composition |
| WO2019012381A1 (en) * | 2017-07-10 | 2019-01-17 | Basf Se | Mixtures comprising a plant growth regulator (pgr) and a nitrification inhibitor such as 2-(3,4-dimethyl-1h-pyrazol-1-yl)succinic acid (dmpsa) or 3,4-dimethyl pyrazolium glycolate (dmpg) |
| CN107935665A (en) * | 2018-01-22 | 2018-04-20 | 刘建平 | Trace element fertilizer and its production method in a kind of solid, water soluble |
| CN109678581A (en) * | 2019-01-08 | 2019-04-26 | 贵州芭田生态工程有限公司 | Complete water-soluble potassium nitrate ca and mg fertilizer and preparation method thereof |
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