CN113816795A

CN113816795A - Medium trace element liquid fertilizer suitable for alkaline soil

Info

Publication number: CN113816795A
Application number: CN202111278189.7A
Authority: CN
Inventors: 高进华; 姚然; 张广忠; 徐勤政; 马瑞成; 杨恒哲; 白静; 刘兆辉
Original assignee: Stanley Agricultural Group Co Ltd
Current assignee: Stanley Agricultural Group Co Ltd
Priority date: 2021-10-30
Filing date: 2021-10-30
Publication date: 2021-12-21

Abstract

The invention discloses a medium-trace element liquid fertilizer suitable for alkaline soil, which comprises mineral potassium fulvate, xanthan gum, mannitol, polyglutamic acid, polyacrylamide, lactic acid, citric acid, organic silicon, a calcium fertilizer, a magnesium fertilizer, a zinc fertilizer, a boron fertilizer and a molybdenum fertilizer; the polyglutamic acid is a biological macromolecule prepared by a biological fermentation method; the polyglutamic acid has molecular weight distribution of 5-200 Da; the molecular weight of the liquid polyglutamic acid selected by the invention is between 10 and 20 ten thousand Da, and the content of the polyglutamic acid is 7.0 percent. The invention can effectively adjust the pH value of the soil, reduce the fixation of medium and trace elements in the soil and improve the utilization rate of the medium and trace elements; the liquid fertilizer is suitable for various periods of crop growth, and can effectively promote the crop growth and improve the quality; the liquid fertilizer is safe and pollution-free in the production process, and does not produce secondary pollution in the use process.

Description

Medium trace element liquid fertilizer suitable for alkaline soil

Technical Field

The invention belongs to the technical field of fertilizers, and particularly relates to a medium-trace element liquid fertilizer suitable for alkaline soil.

Background

In recent years, macroelements of nitrogen, phosphorus and potassium are used in large quantities, but medium and trace element supplement is ignored. The trace elements required by the plant are less but essential elements for the normal growth and development of the plant, and the factors influencing the effectiveness of the trace elements in the soil comprise natural factors and non-natural factors, such as soil matrix, soil forming process, fertilizer application and the like.

Most of trace elements in the soil exist in the soil in a compound and combined form, and in parts of northern areas of China, the content of organic matters in the soil is low, the concentration of salt ions is high, the pH value is alkaline, and large and medium trace elements in the soil are deficient; most of medium trace elements have high utilization rate in the soil with acidic pH, the fertilizer has low utilization rate due to the property of saline-alkali soil, and the trace elements are easy to be fixed after being applied into the soil to form a combined state which is difficult to be absorbed and utilized by plants, so that the effectiveness of the trace elements is influenced; therefore, the research on the medium and trace element fertilizer applicable to the alkaline soil has important significance for improving the effectiveness of the medium and trace element fertilizer.

With the increasingly deep understanding of the action of people on medium and trace elements, research on medium and trace element fertilizers at home and abroad is increasing day by day, common medium and trace elements at present mainly comprise liquid trace element fertilizers, organic liquid fertilizer slow-release granular fertilizers, functional trace element fertilizers and the like, and domestic medium and trace element fertilizers mainly comprise multiple elements, are in a chelated state and are safe to crops.

At the single agitating unit of the common adoption of mixing material in-process, at the stirring in-process, the material is followed stirring vane rotation easily, and stirring effect is unsatisfactory, need mix the stirring for a long time to the material that is difficult for dissolving to produce the precipitate easily.

According to the characteristics of alkaline soil and the effectiveness of medium and trace elements in the soil, the medium and trace element fertilizer which is safe, efficient and suitable for the alkaline soil is prepared by using biomacromolecules and organic acid to improve the pH value of the soil and the granular structure of the soil.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides the medium-trace element liquid fertilizer suitable for alkaline soil, can effectively adjust the pH value of the soil, reduces the fixation of the medium-trace element in the soil, and improves the utilization rate of the medium-trace element; the liquid fertilizer is suitable for various periods of crop growth, and can effectively promote the crop growth and improve the quality; the liquid fertilizer is safe and pollution-free in the production process, and does not produce secondary pollution in the use process.

In order to achieve the purpose, the invention adopts the technical scheme that:

the medium trace element liquid fertilizer suitable for alkaline soil includes mineral potassium fulvate, xanthan gum, mannitol, polyglutamic acid, polyacrylamide, lactic acid, citric acid, organosilicon, calcium fertilizer, magnesium fertilizer, zinc fertilizer, boron fertilizer and molybdenum fertilizer.

In the invention, the polyglutamic acid is a biological macromolecule prepared by a biological fermentation method. The polyglutamic acid has a molecular weight distribution of between 5 and 200 million Da. The molecular weight of the liquid polyglutamic acid selected by the invention is between 10 and 20 ten thousand Da, and the content of the polyglutamic acid is 7.0 percent.

In the invention, the mineral potassium fulvate is a short-chain molecular structure substance obtained by alkali activation from natural humic acid, and is a natural mineral active element potash fertilizer. The mineral source potassium fulvate powder has the humic acid content of more than or equal to 50 percent and the fulvic acid content of more than or equal to 35 percent.

In the present invention, the polyacrylamide is anionic. The molecular weight of the polyacrylamide is between 100 and 200 million, the hydrolysis degree is between 20 and 25, the solid content is more than or equal to 90 percent, and the pH value is neutral.

In the invention, the xanthan gum is microbial extracellular polysaccharide which is produced by using carbohydrate such as corn starch and the like as main raw materials through fermentation engineering and has wide action, and the molecular weight is more than 100 ten thousand.

In the invention, the mannitol is a sugar alcohol, is a white crystalline powder product and has an effective content of more than or equal to 98 percent.

In the invention, the lactic acid is a liquid product, and the effective content is more than or equal to 98 percent.

In the invention, the citric acid is a solid powder product, and the effective content is more than or equal to 98 percent.

In the invention, the organic silicon is a liquid product, and the effective content is more than or equal to 98 percent.

In the invention, the calcium fertilizer is calcium nitrate tetrahydrate, and the effective content is more than or equal to 98 percent.

In the invention, the magnesium fertilizer is magnesium nitrate hexahydrate, and the effective content is more than or equal to 98 percent.

In the invention, the boric fertilizer is boric acid, and the effective content is more than or equal to 98 percent.

In the invention, the zinc fertilizer is zinc sulfate monohydrate, and the effective content is more than or equal to 98 percent.

In the invention, the molybdenum fertilizer is ammonium heptamolybdate, and the effective content is more than or equal to 98 percent.

The invention provides a medium trace element fertilizer suitable for alkaline soil, which comprises the following effective components in parts by weight:

5-40 parts of required phosphorus ore source potassium fulvate, 0.2-5 parts of xanthan gum, 5-20 parts of mannitol, 0.1-10 parts of polyglutamic acid, 0.2-2 parts of polyacrylamide, 1-20 parts of lactic acid, 1-20 parts of citric acid, 0.1-3 parts of organic silicon, 10-50 parts of calcium fertilizer, 10-50 parts of magnesium fertilizer, 0.2-1 part of zinc fertilizer, 0.2-1 part of boron fertilizer, 0.02-0.1 part of molybdenum fertilizer and 300 parts of water, which are uniformly mixed by a stirring device for use;

in the invention, the preferable medium trace element fertilizer suitable for the alkaline soil is found to comprise the following dosage in parts by weight:

300 portions of water, 14 to 20 portions of mineral potassium humate, 0.2 to 1 portion of xanthan gum, 8 to 13 portions of mannitol, 1 to 3 portions of polyglutamic acid, 0.2 to 0.5 portion of polyacrylamide, 7 to 13 portions of lactic acid, 5 to 12 portions of citric acid, 0.1 to 1 portion of organic silicon, 20 to 30 portions of calcium fertilizer, 10 to 20 portions of magnesium fertilizer, 0.3 to 0.7 portion of zinc fertilizer, 0.3 to 0.7 portion of boron fertilizer and 0.02 to 0.05 portion of molybdenum fertilizer.

The stirring device comprises a motor, a connecting flange, a fixed cover, a fixed rod, a driven gear, a rotary sleeve, a movable baffle, a water permeable hole, an inner rack, a helical blade, a rotating shaft, a driving gear, a movable support, stirring rods, a fixed blade and a movable blade, wherein the connecting flange is fixedly arranged at one end of the motor, the rotating shaft is fixedly connected with the output end of the motor, a plurality of stirring rods are fixedly arranged at the tail end of the rotating shaft, two groups of movable blades are movably arranged on the stirring rods, one group of fixed blade is arranged between the two groups of movable blades on the same stirring rod, one end of the fixed rod is fixedly arranged below the connecting flange, the other end of the fixed rod is connected with the fixed cover, the center of the fixed cover is movably connected with the rotating shaft, the rotary sleeve is movably arranged outside the fixed cover, the center of the rotary sleeve is externally connected with the rotating shaft, the driving gear is arranged on the rotating shaft between the rotary sleeve and the fixed cover, the driving gear is connected with the driven gear in a meshed mode, the driven gear is movably mounted on a fixed rod and connected with the inner rack in a meshed mode, the inner rack is fixedly mounted on the inner side of the rotating sleeve, a movable baffle is fixedly mounted on the outer side of the rotating sleeve and provided with a plurality of water permeable holes, a movable support is fixedly mounted on the movable support below the movable baffle and is movably connected with the rotating shaft, spiral blades are arranged between the rotating sleeve and the movable support, and the spiral blades are fixedly mounted on the rotating shaft.

Compared with the prior art, the invention has the beneficial effects that:

1) the mineral source potassium fulvate is added, contains a plurality of active groups, can chelate medium trace elements, reduces the fixation in soil, and can effectively improve the granular structure of the soil, increase the porosity of the soil and facilitate the growth of plant roots;

2) the lactic acid and the citric acid are organic acids, so that the fertilizer is acidic, safe for crop growth, capable of improving the buffering performance of soil, adjusting the pH value of the soil, improving the activity and the moving speed of medium and trace elements in the soil and beneficial to the absorption of the trace elements by plants; the polyglutamic acid and the polyacrylamide are macromolecular bioactive substances, so that the hardening condition of soil can be effectively improved, water and fertilizer retention and chelation soil improvement are facilitated, and meanwhile, the decomposed micromolecular substances can also play a role in promoting the growth of crops;

3) the medium trace element substances such as calcium, magnesium, boron, zinc, molybdenum and the like are effectively combined with the synergist, so that on one hand, required nutrient substances can be supplemented for crops, and on the other hand, the acid-base balance of soil can be adjusted, the soil environment is improved, and the utilization rate of nutrient elements is improved.

4) Through setting up multiunit rabbling mechanism, make the material accomplish quick homogeneous mixing work, rotation axis below equidistance sets up three puddlers of group, install movable blade on the puddler, the puddler is rotating in-process movable blade resource under the rivers effect, the upset rivers direction, prevent that the material from rotating along with the axle, through addding reduction gear group, make adjustable fender's rotational speed be less than the rotational speed of helical blade and puddler, drive the in-process of rotating blade and stirring board rotation at the rotation axis, adjustable fender is rotatory slower all the time, play and block liquid along with the effect of axle rotation, the rivers also can flow between the hole of permeating water at adjustable fender rotation in-process, further disturb the liquid flow direction, make the fertile more even of liquid mix.

Drawings

FIG. 1 is a schematic structural diagram of a medium trace element liquid fertilizer stirring device suitable for alkaline soil;

FIG. 2 is a schematic side view of the stirring device;

FIG. 3 is a schematic view of the internal structure of the rotating sleeve;

FIG. 4 is a schematic structural view of a helical stirring blade;

in the figure: 10. a motor; 11. a connecting flange; 12. a fixed cover; 13. fixing the rod; 131. a driven gear; 14. rotating the sleeve; 141. a movable baffle; 142. water permeable holes; 143. an inner rack; 15. a helical blade; 16. a rotating shaft; 161. a driving gear; 17. a movable support; 18. a stirring rod; 19. a fixed blade; 20. a movable blade.

Detailed Description

For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 4.

Polyglutamic acid is a biopolymer produced by a microbial fermentation method, and is a polymer formed of glutamic acid units. The polyglutamic acid has excellent water solubility, super-strong adsorbability and biodegradability, has the functions of water retention and chelation as a macromolecular substance, can reduce water and fertilizer loss, chelate medium and trace elements, improve the microbial structure of soil, improve the looseness and the air permeability of the soil and improve the hardening condition of the soil. After the polyglutamic acid is degraded into polypeptide, small peptide and monomer, the function of biostimulation and plant nutrition can be achieved, the plant photosynthesis rate is improved, and the plant nutrition metabolism is enhanced.

The mineral potassium fulvate is a short carbon chain molecular structure substance extracted from natural humic acid. The potassium fulvate contains various nutrient components such as trace elements, rare earth elements, plant growth regulators, virus inhibitors and the like, the mineral potassium fulvate has small molecular weight and more active groups, and can chelate major and medium trace nutrient elements to be better utilized by plants; meanwhile, the plant disease can be prevented and controlled, the plant resistance is improved, the microscopic biological activity of the plant is excited, the nutrient absorption is improved, and the germination and growth of the plant are promoted. The mineral potassium fulvate can activate hardened soil, improve the air permeability of the soil, improve the soil structure and create a good rhizosphere environment for plant growth. The fertilizer can supplement nutrients lost in soil in time, activate soil, have vitality and reduce continuous cropping diseases caused by excessive absorption of nutrients in soil.

The polyacrylamide can improve the soil structure, eliminate soil hardening, enhance the soil permeability, improve the buffering performance of the soil and enable the soil to be more suitable for crop growth.

Mannitol is easy to dissolve in water, the solubility of medium and trace elements in liquid can be improved, after mannitol and medium and trace elements are chelated, double-channel transportation of medium and trace elements in plants can be realized, the moving speed is improved, and the fertilizer utilization rate is improved.

The xanthan gum can play a role in thickening the fertilizer, has a good suspension effect on insoluble solids and oil drops, and can avoid the precipitation of the water-soluble fertilizer.

The calcium and the magnesium are used as medium element fertilizers required by crops and have important effects on the growth of the crops. Calcium is an important component of the cell wall, stabilizing the cell membrane, and acting as a second messenger. Magnesium is a chlorophyll component, can promote photosynthesis, plays an important role in the formation of carbohydrates, fats, lipids, nucleic acids and proteins, and can promote the formation of vitamin A and vitamin C in crops to improve the quality of the crops.

Boron, zinc and molybdenum are trace elements required by crops. Zinc is a growth element, participates in the synthesis of auxin and the generation of chlorophyll, and is a component and an activator of various enzymes. Boron is a reproductive element, influences the development of reproductive organs, can promote pollen formation, improve fruit setting rate, promote cell elongation and tissue differentiation, and promote carbohydrate transport and protein metabolism. Molybdenum participates in the reduction of nitric acid and the nitrogen fixation of leguminous plants, influences the phosphorus metabolism in the plants, increases the absorption of phosphorus by the plants and participates in the physiological action of protein synthesis.

The research of the invention finds that the reasonable combination of the medium trace elements and the synergistic substance can effectively improve the utilization rate of the medium trace elements in alkaline earth

the required phosphorus ore source potassium fulvate accounts for 5-40 parts, the required xanthan gum accounts for 0.2-5 parts, the required mannitol accounts for 5-20 parts, the required polyglutamic acid accounts for 0.1-10 parts, the required polyacrylamide accounts for 0.2-2 parts, the required lactic acid accounts for 1-20 parts, the required citric acid accounts for 1-20 parts, the required organosilicon accounts for 0.1-3 parts, the required calcium fertilizer accounts for 10-50 parts, the required magnesium fertilizer accounts for 10-50 parts, the required zinc fertilizer accounts for 0.2-1 part, the required boron fertilizer accounts for 0.2-1 part, the required molybdenum fertilizer accounts for 0.02-0.1 part, and the required water accounts for 180-300 parts.

Example 1

The medium trace element liquid fertilizer suitable for alkaline soil needs 280 parts of water, 16 parts of mineral potassium fulvate, 0.5 part of xanthan gum, 10 parts of mannitol, 2 parts of polyglutamic acid, 0.2 part of polyacrylamide, 8 parts of lactic acid, 7 parts of citric acid, 0.3 part of organosilicon, 30 parts of calcium fertilizer, 20 parts of magnesium fertilizer, 0.5 part of zinc fertilizer, 0.5 part of boron fertilizer and 0.03 part of molybdenum fertilizer.

1) Adding 220 parts of water into a big beaker, adding 10 parts of mannitol, and fully dissolving to obtain uniformly mixed liquid;

2) and (3) adding 16 parts of mineral source potassium fulvate into the liquid obtained in the step (1), and stirring and dissolving to ensure that the solution has no residue.

3) And (3) adding 2 parts of polyglutamic acid, 10 parts of citric acid and 8 parts of lactic acid into the liquid obtained in the step (2), and fully and uniformly stirring.

4) And (3) sequentially adding 30 parts of calcium fertilizer, 20 parts of magnesium fertilizer, 0.5 part of zinc fertilizer, 0.5 part of boron fertilizer and 0.03 part of molybdenum fertilizer into the liquid obtained in the step (3), and fully and uniformly stirring to dissolve the calcium fertilizer, the magnesium fertilizer and the molybdenum fertilizer.

5) And (4) adding 0.3 part of organic silicon into the liquid obtained in the step (4), and fully and uniformly stirring.

6) And (3) adding 60 parts of water into another beaker, sequentially dissolving 0.5 part of xanthan gum and 0.3 part of polyacrylamide, adding the obtained solution into the liquid obtained in the step (5), and uniformly mixing by using a stirring device to obtain the medium-trace element liquid fertilizer suitable for the alkaline soil.

The stirring device comprises a motor 10, a connecting flange 11, a fixed cover 12, a fixed rod 13, a driven gear 131, a rotating sleeve 14, a movable baffle 141, a water permeable hole 142, an internal rack 143, a helical blade 15, a rotating shaft 16, a driving gear 161, a movable support 17, a stirring rod 18, a fixed blade 19 and a movable blade 20, wherein the connecting flange 11 is fixedly installed at one end of the motor 10, the rotating shaft 16 is fixedly connected at the output end of the motor 10, a plurality of stirring rods 18 are fixedly installed at the tail end of the rotating shaft 16, two groups of movable blades 20 are movably installed on the stirring rods 18, one group of fixed blades 19 are installed between the two groups of movable blades 20 on the same stirring rod 18, one end of the fixed rod 13 is fixedly installed below the connecting flange 11, the other end of the fixed rod 13 is connected with the fixed cover 12, the center of the fixed cover 12 is movably connected with the rotating shaft 16, and the rotating sleeve 14 is movably installed outside the fixed cover 12, the external and rotation axis 16 swing joint of rotatory sleeve 14 center, be equipped with driving gear 161 on the rotation axis 16 between rotatory sleeve 14 and the fixed lid 12, driving gear 161 is connected with driven gear 131 meshing, driven gear 131 movable mounting is on a dead lever 13, driven gear 131 is connected with the meshing of internal rack 143, internal rack 143 fixed mounting is inboard at rotatory sleeve 14, the fixed mounting in the outside of rotatory sleeve 14 has adjustable fender 141, the last a plurality of holes 142 that permeate water that are equipped with of adjustable fender 141, fixed mounting is on movable support 17 below adjustable fender 141, adjustable support 17 and rotation axis 16 swing joint, be equipped with helical blade 15 between rotatory sleeve 14 and the adjustable support 17, helical blade 15 fixed mounting is on rotation axis 16.

Example 2

Compared with example 1, the difference is that the amount of water needed is 280 parts, the amount of mineral potassium fulvate is 16 parts, the amount of xanthan gum is 0.5 part, the amount of mannitol is 10 parts, the amount of polyglutamic acid is 2 parts, the amount of polyacrylamide is 0.2 part, the amount of lactic acid is 8 parts, the amount of citric acid is 7 parts, the amount of organosilicon is 0.3 part, the amount of calcium fertilizer is 20 parts, the amount of magnesium fertilizer is 15 parts, the amount of zinc fertilizer is 0.5 part, the amount of boron fertilizer is 0.5 part, and the amount of molybdenum fertilizer is 0.03 part.

A medium trace element liquid fertilizer suitable for alkaline soil use was prepared according to the steps (1) to (6) in example 1.

Example 3

Compared with example 1, the difference is that the amount of water needed is 280 parts, the amount of mineral potassium fulvate is 16 parts, the amount of xanthan gum is 0.5 part, the amount of mannitol is 10 parts, the amount of polyglutamic acid is 2 parts, the amount of polyacrylamide is 0.2 part, the amount of lactic acid is 8 parts, the amount of citric acid is 7 parts, the amount of organosilicon is 0.3 part, the amount of calcium fertilizer is 25 parts, the amount of magnesium fertilizer is 15 parts, the amount of zinc fertilizer is 0.5 part, the amount of boron fertilizer is 0.5 part, and the amount of molybdenum fertilizer is 0.03 part.

And (3) fertilizer efficiency test:

the test site is a Standby demonstration park;

the soil tested: saline-alkali soil of Jiangsu Liyunnang;

and (3) test crops: potting the pakchoi;

soil information: the soil to be tested is saline-alkali soil, the soil nutrient is 1.2 percent of organic matter content, 10.7mg/kg of nitrate nitrogen, 27.9mg/kg of available phosphorus, 54.2mg/kg of quick-acting potassium and the pH value is 8.3.

And (3) test treatment: the invention sets 4 processes, each process has 10 repetitions, and the specific processing information is as follows

Treatment 1: no medium trace element fertilizer is applied for treatment, and 0.3g of urea, 0.34g of monoammonium phosphate and 0.33kg of potassium sulfate are used in each pot.

And (3) treatment 2: and in contrast fertilization treatment, 0.3g of urea, 0.34g of monoammonium phosphate and 0.33kg of potassium sulfate are used in each pot, and a common medium-trace element liquid fertilizer is applied every 10 days in a growth period, wherein 0.4ml of the liquid fertilizer is applied in each pot in a diluted 500-time flush manner.

And (3) treatment: in the fertilization treatment of the medium and trace element liquid fertilizer in the embodiment 1, 0.3g of urea, 0.34g of monoammonium phosphate and 0.33kg of potassium sulfate are used in each pot, and the medium and trace element liquid fertilizer suitable for saline-alkali soil is applied every 10 days in a growth period, wherein 0.4ml of the liquid fertilizer is applied in each pot, and the diluted liquid fertilizer is applied by 500 times.

And (4) treatment: in the fertilization treatment of the medium and trace element liquid fertilizer in the embodiment 2, 0.3g of urea, 0.34g of monoammonium phosphate and 0.33kg of potassium sulfate are used in each pot, and the medium and trace element liquid fertilizer suitable for saline-alkali soil is applied every 10 days in a growth period, wherein 0.4ml of the liquid fertilizer is applied in each pot, and the diluted liquid fertilizer is applied by 500 times.

And (4) treatment 5: in the fertilization treatment of the medium and trace element liquid fertilizer in the embodiment 3, 0.3g of urea, 0.34g of monoammonium phosphate and 0.33kg of potassium sulfate are used in each pot, and the medium and trace element liquid fertilizer suitable for saline-alkali soil is applied every 10 days in a growth period, wherein 0.4ml of the liquid fertilizer is applied in each pot, and the diluted liquid fertilizer is applied by 500 times.

Test arrangement:

the obtained saline-alkali soil is fully and uniformly mixed with urea, monoammonium phosphate and potassium sulfate, the same nutrients of soil in each basin are ensured, and the mixed soil is filled in a basin of 2kg for standby. Each experiment was repeated 10 times. And (3) pouring 300ml of water into each pot to fully wet the soil, uniformly scattering 8 pakchoi seeds into each pot, covering soil, thinning after 3-4 leaves of the seedlings, and leaving 1 plant with the same growth vigor in each pot. The test time is 4 months and 6 days, the harvesting time is 5 months and 20 days, and the growth period is 44 days. Except that the applied medium trace element liquid fertilizer is different, the other management modes are the same.

Results and analysis:

TABLE 1 Fertilizer application

TABLE 2 Effect of three treatments on the Chinese cabbage growth index

Treatment of	Plant height (cm)	Root length (cm)	Fresh weight of single plant (g)
				Process 1	19.1a	9.12b	45.32c
Treatment 2	23.33a	8.56b	54.27b
				Treatment 3	24.03a	12.1a	68.41a
Treatment 4	21.75a	10.11ab	61.22ab
				Treatment 5	21.46a	9.76ab	63.58a

From the above experimental comparison, it can be seen that treatment 3, i.e., treatment with the alkaline earth-suitable medium trace element liquid fertilizer of example 1, exhibited the best plant height, root length, and fresh weight per plant, and the yield was significantly improved compared to treatment 1 and treatment 2.

The medium trace element liquid fertilizer suitable for alkaline soil is used, and the plant height, the root length and the fresh weight of a single plant of the pakchoi are obviously improved compared with the treatments 1 and 2, namely the medium trace element fertilizer is not applied and the common medium trace element fertilizer is used.

Compared with the control treatment, the fresh weight, the plant height and the root length of the samples in the example 2 and the example 3 are obviously improved.

Wherein, the treatment 3, namely the medium and trace element liquid fertilizer in the example 1 is used, the yield is improved by 44.15 percent compared with the treatment not suitable for the medium and trace element fertilizer, and the yield is improved by 20.32 percent compared with the yield obtained by applying the common medium and trace element fertilizer.

The fertilizer is suitable for alkaline-earth medium-trace element fertilizers, can effectively provide required medium-trace nutrient elements for plants, and improves the root length and the yield of the pakchoi; improve soil, improve fertilizer utilization rate and provide good growth environment for crops.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.

Claims

1. The medium trace element liquid fertilizer suitable for alkaline soil is characterized by comprising mineral source potassium fulvate, xanthan gum, mannitol, polyglutamic acid, polyacrylamide, lactic acid, citric acid, organic silicon, a calcium fertilizer, a magnesium fertilizer, a zinc fertilizer, a boron fertilizer and a molybdenum fertilizer.

2. The medium trace element liquid fertilizer applicable to alkaline soil according to claim 1, wherein the polyglutamic acid is a biopolymer prepared by a biological fermentation method; the polyglutamic acid has a molecular weight distribution of between 5 and 200 million Da; the molecular weight of the liquid polyglutamic acid selected by the invention is between 10 and 20 ten thousand Da, and the content of the polyglutamic acid is 7.0 percent.

3. The medium trace element liquid fertilizer applicable to alkaline soil according to claim 1, wherein the mineral potassium fulvate is a short-chain molecular structure substance obtained by alkali activation from natural humic acid, and is a natural mineral active element potassium fertilizer; the mineral source potassium fulvate powder has the humic acid content of more than or equal to 50 percent and the fulvic acid content of more than or equal to 35 percent.

4. The medium trace element liquid fertilizer applicable to alkaline soil according to claim 1, wherein the polyacrylamide is anionic; the molecular weight of the polyacrylamide is between 100 and 200 million, the hydrolysis degree is between 20 and 25, the solid content is more than or equal to 90 percent, and the pH value is neutral.

5. The fertilizer as claimed in claim 1, wherein said xanthan gum is a broad-spectrum microbial exopolysaccharide produced by fermentation engineering using carbohydrate such as corn starch as main raw material and having a molecular weight of 100 ten thousand or more.

6. The medium trace element liquid fertilizer applicable to alkaline soil according to claim 1, wherein mannitol is a sugar alcohol which is a white crystalline powder product with effective content of more than or equal to 98%; the lactic acid is a liquid product, and the effective content is more than or equal to 98 percent; the citric acid is a solid powder product, and the effective content is more than or equal to 98 percent; the organic silicon is a liquid product, and the effective content is more than or equal to 98 percent; the calcium fertilizer is calcium nitrate tetrahydrate, and the effective content is more than or equal to 98 percent; the magnesium fertilizer is magnesium nitrate hexahydrate, and the effective content is more than or equal to 98 percent; the boric fertilizer is boric acid, and the effective content is more than or equal to 98 percent; the zinc fertilizer is zinc sulfate monohydrate, and the effective content is more than or equal to 98 percent; the molybdenum fertilizer is ammonium heptamolybdate, and the effective content is more than or equal to 98 percent.

7. The medium trace element liquid fertilizer applicable to alkaline soil according to claim 1, wherein the medium trace element fertilizer comprises the following components in parts by weight:

8. The fertilizer as claimed in claim 1, wherein the stirring device comprises a motor, a connecting flange, a fixing cover, a fixing rod, a driven gear, a rotating sleeve, a movable baffle, a water permeable hole, an internal rack, a helical blade, a rotating shaft, a driving gear, a movable support, a stirring rod, a fixed blade and a movable blade, the connecting flange is fixedly installed at one end of the motor, the rotating shaft is fixedly connected at the output end of the motor, and a plurality of stirring rods are fixedly installed at the tail end of the rotating shaft.

9. The fertilizer as claimed in claim 1, wherein two sets of movable blades are movably mounted on the stirring rod, a set of fixed blades is mounted between the two sets of movable blades on the same stirring rod, one end of a fixed rod is fixedly mounted below the connecting flange, the other end of the fixed rod is connected with a fixed cover, the center of the fixed cover is movably connected with the rotating shaft, a rotating sleeve is movably mounted on the outer side of the fixed cover, the center of the rotating sleeve is externally arranged and movably connected with the rotating shaft, a driving gear is arranged on the rotating shaft between the rotating sleeve and the fixed cover and meshed with a driven gear, the driven gear is movably mounted on a fixed rod and meshed with an inner rack, the inner rack is fixedly mounted on the inner side of the rotating sleeve, a movable baffle is fixedly mounted on the outer side of the rotating sleeve, and a plurality of water permeable holes are formed in the movable baffle, the lower part of the movable baffle is fixedly arranged on a movable support which is movably connected with the rotating shaft, and a helical blade is arranged between the rotating sleeve and the movable support and fixedly arranged on the rotating shaft.