Liquid fertilizer and application

Abstract

The invention provides a liquid fertilizer and application thereof, and belongs to the technical field of saline-alkali resistance of crops. The problem of how to improve the saline-alkaline tolerance of the soybeans is solved. The liquid fertilizer comprises the following components in parts by weight: 2.5-20 parts of pyruvic acid, 40-60 parts of monoammonium phosphate, 10-20 parts of calcium chloride, 8-15 parts of magnesium chloride, 8-15 parts of zinc sulfate, 7-15 parts of manganese sulfate, 2-12 parts of alginic acid and 1851-1876 parts of water. The fertilizer containing pyruvic acid is used for improving the tolerance of the crops to the saline-alkali soil, so that the crops normally grow in the alkaline soil, and the method is an effective way for enlarging the planting area of the crops in the saline-alkali soil.

Description

Technical Field

[0001] The invention belongs to the technical field of salt-alkali resistance of crops, and in particular relates to a liquid fertilizer and application thereof. Background Art

[0002] Soil salinization is a global environmental problem that poses a serious threat to crop yield and quality. Saline-alkali soils are primarily classified as neutral saline soils and alkaline saline soils. Neutral saline soils are rich in sodium chloride and sodium sulfate, while alkaline saline soils primarily contain alkali metal salts such as sodium carbonate and sodium bicarbonate. Dissolving these salts releases large amounts of alkaline ions, including carbonate, bicarbonate, and hydroxide ions, significantly increasing soil pH. As the plant's most direct contact with the soil environment, roots are extremely sensitive to changes in the soil. Compared to single stresses such as high salinity or high pH, ​​the synergistic effect of these two stresses has a more pronounced inhibitory effect on root growth. When the rhizosphere pH exceeds 7.5, hydroxide ions begin to passively enter the cell membrane. When the rhizosphere pH exceeds 8.1, root growth is significantly inhibited. Simultaneously, carbonate ions inhibit the efflux of sodium ions, leading to intracellular sodium accumulation and toxicity. When the rhizosphere pH exceeds 9.0, root elongation is significantly inhibited, impairing the root's ability to absorb and utilize nutrients and disrupting the ion and mineral balance within the root system. Therefore, alkaline salt stress is far more harmful to plants than neutral salt stress. Summary of the Invention

[0003] In view of this, the present invention aims to propose an application of liquid fertilizer in improving the salt-alkali tolerance of crops, so as to solve the technical problem of how to improve the salt-alkali tolerance of soybeans.

[0004] To achieve the above object, the present invention adopts the following technical solutions: The invention provides a liquid fertilizer. The liquid fertilizer comprises the following components in a weight ratio: pyruvic acid and alginic acid in a ratio of 5:6.

[0005] The present invention provides a liquid fertilizer, which is composed of the following parts by weight: 2.5-20 parts of pyruvic acid, 40-60 parts of pyruvic acid monoammonium phosphate, 10-20 parts of calcium chloride, 8-15 parts of magnesium chloride, 8-15 parts of zinc sulfate, 7-15 parts of manganese sulfate, 2-12 parts of alginic acid and 1851-1876 parts of water.

[0006] The invention provides a liquid fertilizer. The liquid fertilizer is composed of the following components in parts by weight: 2.5 parts of pyruvic acid, 45 parts of pyruvic acid monoammonium phosphate, 10 parts of calcium chloride, 12 parts of magnesium chloride, 19 parts of zinc sulfate, 15 parts of manganese sulfate, 12 parts of alginic acid and 1866.5 parts of water.

[0007] The invention provides a liquid fertilizer. The liquid fertilizer is composed of the following components in parts by weight: 15 parts of pyruvic acid, 60 parts of pyruvic acid monoammonium phosphate, 20 parts of calcium chloride, 15 parts of magnesium chloride, 15 parts of zinc sulfate, 7 parts of manganese sulfate, 4 parts of alginic acid and 1851 parts of water.

[0008] The invention provides a liquid fertilizer. The liquid fertilizer is composed of the following components in parts by weight: 10 parts of pyruvic acid, 55 parts of pyruvic acid monoammonium phosphate, 12 parts of calcium chloride, 8 parts of magnesium chloride, 12 parts of zinc sulfate, 15 parts of manganese sulfate, 8 parts of alginic acid and 1841 parts of water.

[0009] The invention provides a liquid fertilizer. The liquid fertilizer is composed of the following components in parts by weight: 20 parts of pyruvic acid, 40 parts of pyruvic acid monoammonium phosphate, 15 parts of calcium chloride, 5 parts of magnesium chloride, 7 parts of zinc sulfate, 8 parts of manganese sulfate, 2 parts of alginic acid and 1876 parts of water.

[0010] The invention provides a liquid fertilizer. The liquid fertilizer is composed of the following components in parts by weight: 5 parts of pyruvic acid, 50 parts of pyruvic acid monoammonium phosphate, 10 parts of calcium chloride, 10 parts of magnesium chloride, 10 parts of zinc sulfate, 10 parts of manganese sulfate, 6 parts of alginic acid and 1871 parts of water.

[0011] The present invention provides an application of the liquid fertilizer in improving the salt-alkali tolerance of crops, wherein the crops are soybeans or sorghum, and the saline-alkali conditions are 75mM, 55mM, 65mM or 100mM saline-alkali solution.

[0012] It is further defined that the salt-alkali tolerance ability is to increase the survival rate, increase the fresh weight, increase the leaf area and increase the root length.

[0013] The invention provides a method for improving the salt-alkali tolerance of soybean or sorghum. The soybean or sorghum grown in 75mM, 55mM, 65mM or 100mM salt-alkali solution is cultured by applying the liquid fertilizer.

[0014] Compared to existing technologies, the present invention offers the following advantages: Through experimental research, the present invention provides a liquid fertilizer containing pyruvic acid. Compared to conventional liquid fertilizers, pyruvic acid has low volatility and high water solubility, effectively increasing the availability of trace elements such as calcium, magnesium, zinc, iron, and manganese in liquid fertilizer solutions. Using pyruvic acid can improve crop tolerance to saline-alkali soils, enabling them to grow normally in alkaline soils, offering an effective approach to expanding crop cultivation areas in saline-alkali lands. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1Phenotype of soybean plants resistant to stress. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only some of the embodiments of the present application, rather than all the embodiments.

[0017] Embodiment 1. A liquid fertilizer containing pyruvic acid, comprising the following raw materials by weight: Pyruvic acid 2.5 parts Monopotassium phosphate 45 parts Calcium chloride 10 parts Magnesium chloride 12 parts Zinc sulfate 10 parts Manganese sulfate 15 parts Alginic acid 12 parts Water 1866.5 parts Liquid fertilizer preparation: take pyruvic acid 2.5 parts by weight, dissolve and mix evenly, then add monopotassium phosphate 45 parts by weight, stir and dissolve. On this basis, add calcium chloride 10 parts by weight, magnesium chloride 12 parts by weight, zinc sulfate 10 parts by weight, manganese sulfate 15 parts by weight in turn, mix thoroughly, and finally add alginic acid 12 parts to prepare the liquid fertilizer.

[0018] Embodiment 2. A liquid fertilizer containing pyruvic acid, comprising the following raw materials by weight: Pyruvic acid 10 parts Monopotassium phosphate 55 parts Calcium chloride 12 parts Magnesium chloride 8 parts Zinc sulfate 12 parts Manganese sulfate 15 parts Alginic acid 8 parts Water 1841 parts Liquid fertilizer preparation: take pyruvic acid 10 parts by weight, dissolve and mix evenly, then add monopotassium phosphate 55 parts by weight, stir and dissolve. On this basis, add calcium chloride 12 parts by weight, magnesium chloride 8 parts by weight, zinc sulfate 12 parts by weight, manganese sulfate 10 parts by weight in turn, mix thoroughly, and finally add alginic acid 8 parts, 1841 parts of water to prepare the liquid fertilizer.

[0019] Embodiment 3. A liquid fertilizer containing pyruvic acid, comprising the following raw materials by weight: Pyruvic acid 15 parts Monopotassium phosphate 60 parts Calcium chloride 20 parts 15 parts of magnesium chloride 15 parts of zinc sulfate 7 parts of manganese sulfate 4 parts of alginic acid 1851 parts water Liquid fertilizer preparation: Dissolve 15 parts by weight of pyruvic acid, then add 60 parts by weight of monoammonium phosphate and stir to dissolve. Add 20 parts by weight of calcium chloride, 15 parts by weight of magnesium chloride, 15 parts by weight of zinc sulfate, and 7 parts by weight of manganese sulfate in sequence and mix thoroughly. Finally, add 4 parts of alginic acid and 1851 parts of water to prepare the liquid fertilizer.

[0020] Example 4. A liquid fertilizer containing pyruvic acid, comprising the following raw materials in parts by weight: 20 parts of pyruvic acid 40 parts of monoammonium phosphate 15 parts calcium chloride 5 parts of magnesium chloride 7 parts zinc sulfate 8 parts of manganese sulfate 2 parts of alginic acid 1876 ​​parts water Liquid fertilizer preparation: Dissolve 20 parts by weight of pyruvic acid, then add 40 parts by weight of monoammonium phosphate and stir to dissolve. Add 15 parts by weight of calcium chloride, 5 parts by weight of magnesium chloride, 7 parts by weight of zinc sulfate, and 8 parts by weight of manganese sulfate in sequence, mix thoroughly, and finally add 2 parts of alginic acid. Add 1876 parts of water to prepare the liquid fertilizer.

[0021] Example 5. A liquid fertilizer containing pyruvic acid, comprising the following raw materials in parts by weight: 5 parts of pyruvic acid 50 parts of monoammonium phosphate 10 parts calcium chloride 10 parts of magnesium chloride 10 parts zinc sulfate 10 parts of manganese sulfate 6 parts of alginic acid 1871 parts water Liquid fertilizer preparation: Dissolve 10.0 parts by weight of pyruvic acid, then add 50 parts by weight of monoammonium phosphate and stir to dissolve. Add 10 parts by weight of calcium chloride, 10 parts by weight of magnesium chloride, 10 parts by weight of zinc sulfate, and 10 parts by weight of manganese sulfate in sequence and mix thoroughly. Finally, add 6 parts of alginic acid and mix thoroughly with 1871 parts of water to prepare the liquid fertilizer.

[0022] Comparative Example 1. Pyruvic acid 0 parts 50 parts of monoammonium phosphate 10 parts calcium chloride 10 parts of magnesium chloride 10 parts zinc sulfate 10 parts of manganese sulfate 6 parts of alginic acid 1877 parts water Liquid fertilizer preparation: Take 50 parts by weight of monoammonium phosphate and stir to dissolve. Add 10 parts by weight of calcium chloride, 10 parts by weight of magnesium chloride, 10 parts by weight of zinc sulfate, and 10 parts by weight of manganese sulfate in sequence and mix thoroughly. Finally, add 6 parts of alginic acid and mix with 1877 parts of water to prepare the liquid fertilizer.

[0023] Comparative Example 2. 5 parts of pyruvic acid 50 parts of monoammonium phosphate 10 parts calcium chloride 10 parts of magnesium chloride 10 parts zinc sulfate 10 parts of manganese sulfate 0 parts of alginic acid 1878 parts water Preparation of liquid fertilizer: Take 5 parts by weight of pyruvic acid, dissolve and mix well, then add 50 parts by weight of monoammonium phosphate, and then add 10 parts by weight of calcium chloride, 10 parts by weight of magnesium chloride, 10 parts by weight of zinc sulfate, and 10 parts by weight of manganese sulfate in sequence. After fully mixing, mix with 1878 parts of water to prepare the liquid fertilizer.

[0024] Comparative Example 3. 5 parts of pyruvic acid 0 parts of monoammonium phosphate Calcium chloride 0 parts 0 parts of magnesium chloride 0 parts of zinc sulfate Manganese sulfate 0 parts 0 parts of alginic acid 1968 parts water 5 parts by weight of pyruvic acid were mixed with 1968 parts of water to prepare the liquid fertilizer.

[0025] Comparative Example 4. Pyruvic acid 0 parts 0 parts of monoammonium phosphate Calcium chloride 0 parts 0 parts of magnesium chloride 0 parts of zinc sulfate Manganese sulfate 0 parts 6 parts of alginic acid 1967 parts water 6 parts by weight of alginic acid were mixed with 1967 parts of water to prepare the liquid fertilizer.

[0026] Comparative Example 5. 5 parts of pyruvic acid 0 parts of monoammonium phosphate Calcium chloride 0 parts 0 parts of magnesium chloride 0 parts of zinc sulfate Manganese sulfate 0 parts 6 parts of alginic acid 5 parts by weight of pyruvic acid and 6 parts by weight of alginic acid were mixed with 1967 parts of water to prepare the liquid fertilizer.

[0027] Example 6. The pyruvic acid liquid fertilizer prepared in Examples 1-5 and the liquid fertilizer prepared in Comparative Examples 1-2 were selected and tested indoors as follows: 8-10 healthy soybean seeds of uniform size and intact seed coats were sterilized with 2% sodium hypochlorite for 20 minutes. After airing for 20 minutes in a clean bench to remove residual chlorine on the surface, the seeds were evenly sown in pots (10 cm x 15 cm) filled with a soil mixture (nutrient soil: sand = 1:1) at a depth of approximately 1.5 cm. The seeds were irrigated with sterile water to ensure soil moisture. After germination for approximately 5 days, when the soybean seedlings had just begun to break through the soil, they were ready for transplanting. The germinated soybean seedlings were transplanted into pots filled with vermiculite, with a total of three uniformly growing, healthy soybean seedlings per pot. The greenhouse temperature was approximately 25°C, and the photoperiod was a short-day condition of 8 hours light / 16 hours dark.

[0028] Transplanted soybean seedlings were treated with liquid fertilizer for approximately 7 days of normal growth, during the period when the first trifoliate leaves unfolded. Eight treatments were set up, encompassing Examples 1-5 and Comparative Examples 1-4. Liquid fertilizer was diluted 1:500 and drip-irrigated 200 mL per pot every other day for a total of three times. After 7 days of growth, saline-alkali treatment was applied, with each pot receiving 200 mL of a 75 mM saline-alkali solution (sodium bicarbonate:sodium carbonate = 5:1) daily. Ten days after treatment, the effects of liquid fertilizer and alkali tolerance phenotypes were observed, along with corresponding indicators measured.

[0029] Phenotypic observations were performed on soybean plants treated with liquid fertilizers of Examples 1-5 and Comparative Examples 1-4 for one week. The results are shown in Tables 1 and Figure 1As shown, under the conditions of 75mM alkali treatment, the liquid fertilizers of Comparative Examples 1 and 4 were compared, and the soybean plants were severely stressed by saline-alkali soil, and most of them died. At the same time, the fresh weight of the plants, leaf area and root length were also lower than those of other liquid fertilizer treatments, indicating that alginic acid alone or mixed with calcium, magnesium, zinc and manganese trace elements could not improve the stress tolerance of soybeans. Compared with Comparative Examples 1 and 4, the liquid fertilizers of Comparative Examples 2 and 3 with drip irrigation could improve the survival rate, plant fresh weight, leaf area and root length of soybean plants, indicating that pyruvic acid alone or mixed with calcium, magnesium, zinc and manganese trace elements could promote the growth of soybean plants and effectively improve the salt-alkali stress tolerance of soybean plants; compared with Comparative Example 2, the liquid fertilizer of Comparative Example 5 with drip irrigation could improve the survival rate, plant fresh weight, leaf area and root length of soybean plants, indicating that the mixed application of pyruvic acid and alginic acid could promote the growth of soybean plants and effectively improve the salt-alkali stress tolerance of soybean plants. Compared with Comparative Example 1 and Comparative Example 2, the soybean plant survival rate in Examples 2-5 was higher (87.89%-100%), the soybean plant fresh weight was heavier (11.93-12.49), the soybean plant total leaf area was relatively large (18200-21000), and the soybean plant root system was relatively long (32.19-35.63). It can be seen that Examples 2-5 can significantly improve the salt-alkali tolerance of soybeans. Among them, the soybean plants had the best salt-alkali tolerance indicators after drip irrigation with the liquid fertilizer prepared in Example 5, indicating that introducing an appropriate amount of alginic acid into the pyruvic acid liquid fertilizer can effectively improve the salt-alkali tolerance of soybean plants.

[0030] Table 1 Indoor potted plant test results and statistical table

[0031] Example 7. The pyruvic acid liquid fertilizer prepared in Example 5 was selected and tested indoors as follows: 8-10 healthy soybean seeds of uniform size and undamaged seed coats were sterilized with 2% sodium hypochlorite for 20 minutes, then air-dried in a clean bench for 20 minutes to remove residual chlorine on the surface. The seeds were evenly sown in a growth pot (10 cm * 15 cm) filled with mixed soil (nutrient soil: sand = 1:1) at a sowing depth of about 1.5 cm. The seeds were irrigated with sterile water to ensure soil moisture. After germination for about 5 days, when the soybean seedlings had just begun to push up the soil, they were ready for transplanting. The germinated soybean seedlings were transplanted into a growth pot filled with vermiculite, with a total of 3 soybean seedlings of uniform growth and healthy growth in each growth pot. The temperature in the greenhouse was about 25°C, and the photoperiod was a short-day condition of 8 hours of light / 16 hours of darkness.

[0032] After transplanting, the soybean seedlings grew normally for about 7 days, that is, the first three-leaf expansion period, and were treated with liquid fertilizers. Two treatments were set, namely, Example 5 and a clear water control.

[0033] Liquid fertilizer was diluted 1:500, and each pot was drip irrigated with 200 mL each time, drip irrigated every other day, and drip irrigated for a total of 3 times; Water control: each pot was drip irrigated with 200 mL of water each time, drip irrigated every other day. After 7 days of growth, salt and alkali treatment was performed; Example 5 and the water control were each divided into 3 groups, and each pot was irrigated with 200 mL of 55 mM, 65 mM and 100 mM (sodium bicarbonate: sodium carbonate = 5:1) salt and alkali solution per day, respectively. After 10 days of treatment, the effect of liquid fertilizer and alkali tolerance phenotype observation and corresponding index determination were performed.

[0034] Phenotype observation was performed on soybean plants treated with the liquid fertilizer of Example 5 and water for one week, and the results are shown in Table 2. Under the conditions of 55 mM, 65 mM and 100 mM salt and alkali solution treatment, the soybean plants treated with water were under heavy salt and alkali stress, and all the soybean plants treated with 100 mM salt and alkali solution died. Only a small amount of soybean plants survived under the conditions of 65 mM and 55 mM salt and alkali solution treatment, but the growth of the plants was significantly inhibited. The soybean plants treated with the liquid fertilizer of Example 5 survived under the conditions of 55 mM and 65 mM salt and alkali solution treatment, and the survival rate reached 88.89% under the condition of 100 mM salt and alkali solution treatment. Compared with the water treatment, the liquid fertilizer of Comparative Example 5 can improve the fresh weight, leaf area and root length of soybean plants under the stress of 55 mM, 65 mM and 100 mM different concentrations of salt and alkali solution, indicating that the application of the liquid fertilizer of Example 5 can improve the salt and alkali tolerance of soybean plants under different salt and alkali stress intensities.

[0035] Table 2 Effect of indoor pot experiment with different salt and alkali solutions and statistical table

[0036] Example 8. The liquid fertilizer prepared in Example 5 was selected for the following field tests.

[0037] Test site: A typical soda saline-alkali soil in Haoyao Sumu, Middle Right Wing of Horqin Banner, Xing'an League, Inner Mongolia, with medium to heavy alkaline soil, pH value of 8.8~10.5, and total salt content of 2.49~3.98%.

[0038] Tested soybean variety: The soybean variety was Zinong No. 7, which was selected and bred by Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences.

[0039] Test treatment: (1) Control: fertilization according to the local farmers' habit, 30 kg of compound fertilizer (N: 13.34, P: 23.48, K: 11.5) was applied per mu before sowing, and water was drip irrigated 4 days after sowing, 4 days after emergence, 11 days and 18 days.

[0040] (2) Liquid fertilizer treatment: Before sowing, 30 kg of compound fertilizer (N: 13.34, P: 23.48, K: 11.5) was applied per mu. At the same time, the liquid fertilizer of Example 5 was applied. Drip irrigation was carried out 4 times at 4 days after sowing, 4 days after emergence, 11 days after emergence, and 18 days after emergence. Each drip irrigation used 0.5 m 3 10 L of liquid fertilizer was applied for each drip irrigation, for a total of 40 L. The experimental plot was 66.7 m2 / plot and repeated 3 times.

[0041] The test showed that 11 days after seedling emergence, the pyruvic acid liquid fertilizer Qinong No. 7 drip-irrigated in Example 5 was 19.87% taller than the control. At harvest, the plant height of Qinong No. 7 drip-irrigated in Example 5 was 1.25 cm taller than the control. The average dry matter weight per plant increased by 12.53%, and the underground root weight per plant increased by 25.63%. Grain yield in the treated area was 89.2 kg / mu, while in the control area it was 148.4 kg / mu, a 39.89% increase in grain yield.

[0042] Example 9. The liquid fertilizer prepared in Example 5 was selected to conduct the following field test.

[0043] The experimental site was a typical soda saline-alkali land in Haoyao Sumu, Horqin Right Middle Banner, Xing'an League, Inner Mongolia. The soil was moderately to heavily alkaline, with a pH of 8.8-10.5 and a total salt content of 2.49-3.98%.

[0044] Sorghum variety for testing: Sorghum variety Longza 28, selected from the Crop Resources Research Institute of Heilongjiang Academy of Agricultural Sciences Experimental treatments: (1) Control: Fertilization was carried out according to local farmers' habits. 30 kg of compound fertilizer (N: 13.34, P: 23.48, K: 11.5) was applied per mu before sowing. Drip irrigation was carried out four times at 4 days after sowing, 4 days after emergence, 11 days after emergence, and 18 days after emergence.

[0045] (2) Liquid fertilizer treatment: Before sowing, 30 kg of compound fertilizer (N: 13.34, P: 23.48, K: 11.5) was applied per mu. At the same time, the liquid fertilizer of Example 5 was applied. Drip irrigation was carried out 4 times at 4 days after sowing, 4 days after emergence, 11 days after emergence, and 18 days after emergence. Each drip irrigation used 0.5 m 3 10L of liquid fertilizer was applied for each drip irrigation, for a total of 40L. The experimental plot was 66.7m2 / plot, and repeated 3 times. The test showed that 11 days after seedling emergence, Longza 28, a pyruvic acid liquid fertilizer drip-irrigated in Example 5, was 15.12% taller than the control. At harvest, Longza 28, a pyruvic acid liquid fertilizer drip-irrigated in Example 5, was 23.34 cm taller than the control. The average dry matter weight per plant increased by 36.44%, and the root weight per plant increased by 43.73%. Grain yield in the treated area was 215.6 kg / mu, while in the control area it was 278.8 kg / mu, a 29.31% increase.

[0046] The specific embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The specific embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A liquid fertilizer, characterized in that: The liquid fertilizer comprises the following composition in the following weight ratio: pyruvic acid and alginic acid in a ratio of 5:

6.

2. A liquid fertilizer, characterized in that: The liquid fertilizer is composed of the following parts by weight: 2.5-20 parts of pyruvic acid, 40-60 parts of pyruvic acid monoammonium phosphate, 10-20 parts of calcium chloride, 8-15 parts of magnesium chloride, 8-15 parts of zinc sulfate, 7-15 parts of manganese sulfate, 2-12 parts of alginic acid and 1851-1876 parts of water.

3. A liquid fertilizer, characterized in that: The liquid fertilizer is composed of the following parts by weight: 2.5 parts of pyruvic acid, 45 parts of pyruvic acid monoammonium phosphate, 10 parts of calcium chloride, 12 parts of magnesium chloride, 19 parts of zinc sulfate, 15 parts of manganese sulfate, 12 parts of alginic acid and 1866.5 parts of water.

4. A liquid fertilizer, characterized in that The liquid fertilizer is composed of the following parts by weight: 10 parts of pyruvic acid, 55 parts of pyruvic acid monoammonium phosphate, 12 parts of calcium chloride, 8 parts of magnesium chloride, 12 parts of zinc sulfate, 15 parts of manganese sulfate, 8 parts of alginic acid and 1841 parts of water.

5. A liquid fertilizer, characterized in that: The liquid fertilizer is composed of the following parts by weight: 15 parts of pyruvic acid, 60 parts of pyruvic acid monoammonium phosphate, 20 parts of calcium chloride, 15 parts of magnesium chloride, 15 parts of zinc sulfate, 7 parts of manganese sulfate, 4 parts of alginic acid and 1851 parts of water.

6. A liquid fertilizer, characterized in that: The liquid fertilizer is composed of the following parts by weight: 20 parts of pyruvic acid, 40 parts of pyruvic acid monoammonium phosphate, 15 parts of calcium chloride, 5 parts of magnesium chloride, 7 parts of zinc sulfate, 8 parts of manganese sulfate, 2 parts of alginic acid and 1876 parts of water.

7. A liquid fertilizer, characterized in that: The liquid fertilizer is composed of the following parts by weight: 5 parts of pyruvic acid, 50 parts of pyruvic acid monoammonium phosphate, 10 parts of calcium chloride, 10 parts of magnesium chloride, 10 parts of zinc sulfate, 10 parts of manganese sulfate, 6 parts of alginic acid and 1871 parts of water.

8. Use of the liquid fertilizer according to any one of claims 1 to 7 in improving the salt-alkali tolerance of crops, characterized in that: The crop is soybean or sorghum, and the saline-alkali condition is 75mM, 55mM, 65mM or 100mM saline-alkali solution.

9. The use according to claim 8, characterized in that The salt-alkali tolerance ability is to improve the survival rate, increase the fresh weight, increase the leaf area and increase the root length.

10. A method for improving the salt-alkali tolerance of soybean or sorghum, characterized in that: Soybean or sorghum grown in 75 mM, 55 mM, 65 mM or 100 mM saline-alkali solution is cultured by applying the liquid fertilizer according to any one of claims 1 to 7.

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