Liquid fertilizer special for lettuce and suitable for being planted in alkaline soil and fertilizing method of liquid fertilizer

Abstract

The invention belongs to a lettuce special liquid fertilizer suitable for alkaline soil planting and a fertilizing method thereof. Comprising a component A and a component B. The component A comprises the following raw materials in parts by weight: 6-10 parts of a potash fertilizer, 4-7 parts of ammonium polyphosphate, 23-29 parts of liquid slow-release nitrogen, 7-15 parts of mineral fulvic acid, 4-8 parts of a soil pH buffer agent, 0.3-0.8 part of a penetrant, 0.7-2.0 parts of compound trace elements and 33-40 parts of water. The component B is prepared from the following raw materials in parts by weight: 4-10 parts of a soil loosening agent, 6.5-15 parts of a soil awakening agent, 0.6-2.0 parts of polyglutamic acid and 0.1-0.5 part of a penetrating agent; the fertilizer can regulate and improve alkaline soil and improve the absorption efficiency of the lettuce on nutrient elements and other nutrients at the same time, the effects of increasing yield and improving quality are achieved in a convenient fertilization mode and with a small dosage, and further deterioration of soil and waste of resources caused by use of conventional fertilizers are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to a special liquid fertilizer for lettuce suitable for planting in alkaline soil and a fertilization method thereof. Background Art

[0002] Lettuce belongs to the genus Lactuca in the Asteraceae family. It can be eaten raw, is crisp and refreshing, rich in vitamins, cellulose, antioxidants and a large amount of carbohydrates, and contains very low calories. With the promotion of healthy eating, it is becoming more and more popular among consumers. Lettuce cultivation requires soil that is rich in organic matter, loose and well-drained. It prefers slightly acidic soil, and the pH value of the soil should be between 5-7. However, most of the soil in northern my country is alkaline, and the pH and salt content of alkaline soil are high, the content of organic matter and trace elements such as iron and manganese is low, the permeability is poor, the soil texture is hard, and it is easy to become compacted, waterlogged and leaky. If lettuce is planted on alkaline soil, it may cause trace element deficiency in the lettuce, and at the same time, the growth and respiration of the root system will be hindered, and the ability to absorb nutrients will be reduced, which will ultimately affect the quality and yield of the lettuce.

[0003] At present, most lettuce planting areas mainly use the situation of applying base fertilizer and topdressing at the same time. Some special fertilizers for lettuce have appeared in the prior art or on the market, such as the following patents: Chinese invention patent CN 108358723 A discloses an organic fertilizer for high yield of lettuce, including the following raw materials by weight: 6-11 parts of navel orange peel, 40-68 parts of rotten peaches, 32-44 parts of straw, 50-75 parts of plant ash, 45-63 parts of decomposed animal feces, 8-15 parts of ophiopogon residue, 4-10 parts of seaweed, 16-25 parts of molasses, 3-4 parts of bone meal, 0.8-2.4 parts of nicotine, 1-3 parts of protease, 2.2-4.5 parts of cellulase, 2-4 parts of flonicamid and 5-8 parts of glycerol, and provides a preparation method. Although the invention formula is rich in organic matter, it lacks nutrients, especially trace elements, and the organic fertilizer has poor water solubility, a long nutrient release cycle, and a short lettuce growth cycle, which is not conducive to the efficient absorption of nutrients by lettuce, thereby affecting the quality and yield of lettuce. Chinese invention patent CN 106631254 A discloses a special fertilizer for lettuce planting, including the following raw materials by weight: 50-60 parts of phosphorus pentoxide, 5-8 parts of superphosphate, 7-11 parts of potassium oxide, 11-20 parts of medical stone, 13 parts of ferrous sulfate and 10-11 parts of boric acid. Although the invention formula can supplement chemical elements, it does not improve the alkaline soil, cannot comprehensively improve the soil condition, and trace elements are easily fixed, the overall fertilizer nutrient utilization rate is low, and it is easy to cause further soil compaction and salinization.

[0004] Therefore, the most effective measure for growing lettuce in alkaline soil is to apply fertilizers that can both regulate and improve alkaline soil and improve the efficiency of lettuce in absorbing nutrients and other nutrients, so as to achieve the effect of increasing production and improving quality with convenient fertilization methods and less dosage, and avoid further soil deterioration and waste of resources caused by the use of conventional fertilizers. Therefore, in the current form, a fertilizer that is simple and convenient to apply, can both improve the condition of alkaline soil and improve the efficiency of fertilizer nutrient absorption and utilization is particularly important for improving the yield and quality of lettuce grown in alkaline soil. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and to provide a liquid fertilizer suitable for lettuce cultivation in alkaline soil and a fertilization method thereof, so as to overcome the defects in the prior art.

[0006] The object of the present invention is achieved in that:

[0007] A liquid fertilizer for lettuce suitable for planting in alkaline soil, comprising component A and component B.

[0008] Component A includes the following raw materials in parts by weight: 6-10 parts of potash fertilizer, 4-7 parts of ammonium polyphosphate, 23-29 parts of liquid slow-release nitrogen, 7-15 parts of mineral humic acid, 4-8 parts of soil pH buffer, 0.3-0.8 parts of penetrant, 0.7-2.0 parts of complex trace elements, and 33-40 parts of water;

[0009] Component B includes the following raw materials in parts by weight: 4-10 parts of soil loosening agent, 6.5-15 parts of soil awakening agent, 0.6-2.0 parts of polyglutamic acid, and 0.1-0.5 parts of penetrant;

[0010] The soil loosening agent comprises: reacting and stirring distilled water, acrylamide and acrylic acid at a mass ratio of 45:3:2 at room temperature for 10 minutes; then adding EDTA-Na and urea into the system, wherein the ratio of EDTA-Na, urea and distilled water is 1:1:4000-9000; then adding potassium bicarbonate into the system, wherein the ratio of potassium bicarbonate to acrylic acid is 1-1.5:1, and then adding ammonium persulfate and sodium bisulfite into the system, wherein the ratio of the weight of ammonium persulfate, sodium sulfite to the sum of the weight of acrylic acid and acrylamide is 2:1:450-850, stirring for 3 hours at a temperature of 60-70°C after the addition is completed, and cooling to room temperature after the reaction is completed, so as to obtain a finished soil loosening agent;

[0011] The penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate;

[0012] The soil awakening agent is a fermentation liquid of metabolites prepared by culturing, inoculating, fermenting, filtering and the like of spores of Streptomyces freundii.

[0013] The beneficial effects of the present invention are as follows: the present invention comprises a soil loosening agent, a pH buffer and a soil awakening agent, wherein the soil loosening agent can promote the formation of soil aggregate structure, improve soil permeability and improve soil structure from a physical aspect; the soil pH buffer reduces the pH of rhizosphere soil to a neutral region by chemical means; and the soil awakening agent can promote the rapid reproduction of beneficial bacteria in the soil, promote the beneficial bacteria to occupy a dominant position and improve the soil microbial environment; a good soil aggregate structure and a suitable pH are conducive to the diversity and richness of soil microbial species, and the microorganisms can increase the stability of aggregates by secreting adhesives by themselves, and the three interact and promote each other to improve the soil in all aspects from physical, chemical and microbial aspects; the rapid improvement of the soil is achieved through the interaction of the above three, and the synergistic components composed of polyglutamic acid, the soil loosening agent and the soil awakening agent can promote the growth and development of the crop root system, and the synergistic components are promoted to quickly approach the root system through the carrier effect of the permeating agent so as to be absorbed by the root system, so as to promote the development of the crop root system and improve the nutrient absorption efficiency, thereby achieving the effect of increasing production and improving quality.

[0014] Preferably, the potash fertilizer is a combination of two or more of potassium chloride, potassium nitrate and potassium pyrophosphate; and the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million.

[0015] Preferably, the liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%.

[0016] Preferably, the composite trace elements are a combination of two or more of EDTA zinc, EDTA manganese, EDTA copper, boric acid, and ferrous citrate.

[0017] Preferably, the composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid and ferrous citrate is 1:2:1:2.7-3.7.

[0018] Preferably, the mass ratio of component A to component B is 4 to 9:1.

[0019] Preferably, the pH buffer consists of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 4 to 6:1.

[0020] Preferably, the mass ratio of the block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate is 5-10:4:1.

[0021] Preferably, component A comprises the following raw materials in parts by weight: 8-10 parts of potash fertilizer, 5-6 parts of ammonium polyphosphate, 24-27 parts of liquid slow-release nitrogen, 8-13 parts of mineral humic acid, 4-6 parts of soil pH buffer, 0.3-0.5 parts of penetrant, 0.9-1.6 parts of complex trace elements, and 34-38 parts of water;

[0022] Component B comprises the following raw materials in parts by weight: 5-8 parts of soil loosening agent, 8-13 parts of soil awakening agent, 0.7-1.5 parts of polyglutamic acid, and 0.2-0.4 parts of penetrant.

[0023] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, the fertilizing method comprising the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5-4 h.

[0024] According to the above scheme, a special liquid fertilizer for lettuce suitable for alkaline soil planting and a fertilization method thereof are prepared. The present invention can improve the absorption efficiency of lettuce to nutrients and other nutrients while conditioning and improving alkaline soil. The fertilizer achieves the effect of increasing production and improving quality with a convenient fertilization method and a small amount, and avoids further deterioration of the soil and waste of resources caused by the use of conventional fertilizers; specifically, the liquid fertilizer of the present invention contains a soil loosening agent, a pH buffer, and a soil awakening agent, wherein the soil loosening agent can promote the formation of soil aggregate structure, improve soil permeability, and improve the soil structure from a physical aspect; the soil pH buffer reduces the pH of the rhizosphere soil to a neutral region by chemical means; and the soil awakening agent can promote the rapid reproduction of beneficial bacteria in the soil, promote the beneficial bacteria to occupy a dominant position, and improve the soil microbial environment. Good soil aggregate structure and suitable pH are conducive to the diversity and richness of soil microbial species, and the microorganisms can increase the stability of the aggregates by secreting adhesives by themselves. The three interact and promote each other, and improve the soil in all aspects from the physical, chemical, and microbial aspects. Furthermore, the B component of the liquid fertilizer of the present invention contains a soil loosening agent, a soil awakening agent, polyglutamic acid, and a soil permeabilizing agent; the soil permeabilizing agent described in the liquid fertilizer of the present invention can promote the speed and depth of infiltration of nutrients in alkaline soil, and the synergistic components composed of polyglutamic acid, a soil loosening agent and a soil awakening agent can promote the growth and development of crop roots, and through the carrier effect of the permeabilizing agent, the synergistic components are promoted to quickly approach the root system so as to be absorbed by the root system, which can more effectively promote the development and vigorous growth of crop roots than using polyglutamic acid, a soil loosening agent and a soil awakening agent alone; further, the A and B components in the liquid fertilizer for lettuce of the present invention are used in steps, that is, the soil loosening agent, soil awakening agent, polyglutamic acid and the like in the B component are first used to promote the formation of soil aggregate structure, open and stabilize soil channels, and adhere a permeation-promoting film in the soil channel through adsorption and ion exchange, while providing an aerobic environment for the rapid reproduction of soil microorganisms. Then, component A is applied to increase the efficiency of nutrients reaching the root system of the crop. In addition, the pH buffering effect of component A makes the nutrient solution reaching the rhizosphere area neutral, thereby improving the absorption and utilization efficiency of each element. As we all know, lettuce is a leafy vegetable, and the nitrate content and trace element deficiency directly affect the quality of the product. The liquid slow-release nitrogen used in the nitrogen source of the formula of the present invention is an organic small molecule nitrogen compound. Compared with other nitrogen sources, this nitrogen source has no nitrate nitrogen or very little nitrate nitrogen produced during the absorption and conversion process, so it can reduce the accumulation of nitrate content in crops.In addition, the ratio of each trace element in the present invention is particularly suitable for the need of lettuce for trace elements, and the trace elements are in a chelated state. In addition, the chelation effect of polyglutamic acid on the trace elements improves the effectiveness of the trace elements, effectively prevents trace element deficiency, and improves the quality of lettuce. The liquid fertilizer described in the present invention is suitable for the cultivation of lettuce in alkaline soil. The various components act as a whole under a given ratio and play a synergistic role with each other. There is no need to apply base fertilizer during the planting process. Only topdressing of this kind of fertilizer can quickly meet the needs of lettuce for nutrients and organic matter, avoiding the phenomenon of further soil compaction and salinization caused by low base fertilizer utilization rate. At the same time, by improving the alkaline soil, it can also promote the efficient absorption of various nutrients by lettuce, and the yield and quality of lettuce can be increased and improved with a convenient fertilization method and a small amount. DETAILED DESCRIPTION

[0025] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil and a fertilizing method thereof. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 6-10 parts of potash fertilizer, 4-7 parts of ammonium polyphosphate, 23-29 parts of liquid slow-release nitrogen, 7-15 parts of mineral humic acid, 4-8 parts of soil pH buffer, 0.3-0.8 parts of penetrant, 0.7-2.0 parts of composite trace elements, and 33-40 parts of water; the B component comprises the following raw materials in parts by weight: 4-10 parts of soil loosening agent, 6.5-15 parts of soil awakening agent, 0.6-2.0 parts of polyglutamic acid, and 0.1-0.5 parts of penetrant; the soil loosening agent comprises distilled water, acrylamide, and acrylic acid in a mass ratio of 45:3:2, reacted and stirred at room temperature to dissolve Decompose for 10 minutes; then add EDTA-Na and urea to the system, the ratio of EDTA-Na, urea and distilled water is 1:1:4000-9000; then add potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1-1.5:1, continue to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:450-850, after the addition is completed, stir for 3 hours at a temperature of 60-70°C, cool to room temperature after the reaction is completed, and obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation broth prepared by culturing, inoculating, fermenting, filtering, etc. of Streptomyces freundii spores. The viscosity average molecular weight of the loosening agent described in the present invention is 3-5 million.

[0026] Furthermore, the potash fertilizer is a combination of two or more of potassium chloride, potassium nitrate and potassium pyrophosphate; and the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million.

[0027] Furthermore, the liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%.

[0028] Furthermore, the composite trace elements are a combination of two or more of EDTA zinc, EDTA manganese, EDTA copper, boric acid, and ferrous citrate.

[0029] Furthermore, the composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid and ferrous citrate is 1:2:1:2.7-3.7.

[0030] Furthermore, the mass ratio of component A to component B is 4 to 9:1.

[0031] Furthermore, the pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 4 to 6:1.

[0032] Furthermore, the mass ratio of the block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate is 5-10:4:1.

[0033] Furthermore, component A includes the following raw materials in parts by weight: 8-10 parts of potash fertilizer, 5-6 parts of ammonium polyphosphate, 24-27 parts of liquid slow-release nitrogen, 8-13 parts of mineral humic acid, 4-6 parts of soil pH buffer, 0.3-0.5 parts of permeating agent, 0.9-1.6 parts of complex trace elements, and 34-38 parts of water; component B includes the following raw materials in parts by weight: 5-8 parts of soil loosening agent, 8-13 parts of soil awakening agent, 0.7-1.5 parts of polyglutamic acid, and 0.2-0.4 parts of permeating agent.

[0034] The preparation method of the liquid fertilizer for lettuce planted in alkaline soil is as follows: according to the proportion, potassium fertilizer, ammonium polyphosphate, liquid slow-release nitrogen, mineral humic acid, soil pH buffer, permeabilizer, and composite trace elements are weighed and added into a reaction kettle containing water, heated to 35-45° C., and stirred to dissolve to obtain component A. The soil loosening agent, soil awakening agent, polyglutamic acid, and permeabilizer are mixed and stirred evenly to obtain component B.

[0035] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5-4 h.

[0036] The liquid fertilizer described in the present invention can improve the soil from the three aspects of physics, chemistry and microorganisms, and at the same time enhance the penetration of nutrients, water and other effective ingredients, improve the absorption and utilization efficiency of nutrients by the root system, and can also enhance the efficient absorption of trace elements by crops, reduce the accumulation of nitrate content, and achieve the increase in yield and quality of lettuce with a convenient fertilization method and a small amount; specifically, the liquid fertilizer A and B components described in the present invention are used in steps, and the liquid fertilizer B component contains a soil loosening agent, a soil awakening agent, polyglutamic acid, and also contains a soil permeabilizer; in an alkaline soil environment, the alkaline soil texture is closed, and the infiltration speed of water and nutrients is slow or difficult to infiltrate, and the root system cannot get sufficient nutrient supply, resulting in obstructed root growth; the soil permeabilizer described in the present invention can promote the speed and depth of nutrient infiltration in alkaline soil, and the synergistic components composed of polyglutamic acid, soil loosening agent and soil awakening agent can promote the growth and development of crop roots, through The carrier function of the permeation agent promotes the synergistic ingredients to quickly approach the root system so that they are absorbed by the root system, so as to effectively promote the development of the crop root system and the vigorous growth. On this basis, component A is applied, and component A mainly contains effective elements for the growth of lettuce. Through the role of component B in promoting root development, the lettuce can quickly absorb the nutrients in component A; further, component A has a pH buffering effect, so that the nutrient solution reaching the rhizosphere area is in a neutral state, thereby further improving the absorption and utilization efficiency of each element; the liquid fertilizer described in the present invention contains a soil loosening agent, a pH buffer, and a soil awakening agent, wherein the soil loosening agent can promote the formation of soil aggregate structure, improve soil permeability, and improve soil structure from a physical aspect; the soil pH buffer chemically reduces the pH of the rhizosphere soil to the neutral region; and the soil awakening agent can promote the rapid reproduction of beneficial bacteria in the soil, promote beneficial bacteria to occupy a dominant position, and improve the soil microbial environment. Good soil aggregate structure and appropriate pH are conducive to the diversity and richness of soil microorganisms, and microorganisms can increase the stability of aggregates by secreting adhesives. The three interact and promote each other, and quickly improve the soil from physical, chemical, and microbiological aspects, so as to achieve the characteristics of rapid growth of lettuce under the premise of improving the soil. As we all know, the growth period of lettuce after transplanting is about one month. Based on this, how to meet the nutritional elements required for the growth of lettuce in an alkaline soil environment has become a technical problem that needs to be solved urgently. The present invention improves the soil from multiple angles, promotes the root development of lettuce, and cooperates with liquid slow-release nitrogen and other elements to promote the efficient absorption of various nutrients by lettuce, and achieves the advantages of increasing production and improving quality of lettuce under the premise of applying less fertilizer.

[0037] The present invention is described in detail and specifically by specific examples below to provide a better understanding of the present invention, but the following examples do not limit the protection scope of the present invention.

[0038] Example 1

[0039] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 6 parts of potash fertilizer, 4 parts of ammonium polyphosphate, 23 parts of liquid slow-release nitrogen, 7 parts of mineral humic acid, 4 parts of soil pH buffer, 0.3 parts of permeabilizer, 0.7 parts of composite trace elements and 33 parts of water; the B component comprises the following raw materials in parts by weight: 4 parts of soil loosening agent, 6.5 parts of soil awakening agent, 0.6 parts of polyglutamic acid and 0.1 parts of permeabilizer; the soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve at room temperature for 10 minutes; and then EDTA- Na and urea are added into the system, and the ratio of EDTA-Na, urea and distilled water is 1:1:4000; then potassium bicarbonate is added into the system, and the ratio of potassium bicarbonate to acrylic acid is 1:1, and ammonium persulfate and sodium bisulfite are continuously added into the system, and the ratio of the weight of ammonium persulfate, sodium sulfite to the sum of the weight of acrylic acid and acrylamide is 2:1:450. After the addition is completed, stir for 3 hours at a temperature of 60°C, and cool to room temperature after the reaction is completed to obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a fermentation liquid of metabolites prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is potassium chloride, potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, and the nitrogen content is greater than or equal to 28%. The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:2.7. The mass ratio of component A to component B is 4:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 4:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 5:4:1.

[0040] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, the fertilizing method comprising the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5 h.

[0041] Example 2

[0042] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 10 parts of potash fertilizer, 7 parts of ammonium polyphosphate, 29 parts of liquid slow-release nitrogen, 15 parts of mineral humic acid, 8 parts of soil pH buffer, 0.8 parts of permeabilizer, 2.0 parts of composite trace elements and 40 parts of water; the B component comprises the following raw materials in parts by weight: 10 parts of soil loosening agent, 15 parts of soil awakening agent, 2.0 parts of polyglutamic acid and 0.5 parts of permeabilizer; the soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve for 10 minutes at room temperature; and then EDTA- Na and urea are added into the system, and the ratio of EDTA-Na, urea and distilled water is 1:1:9000; then potassium bicarbonate is added into the system, and the ratio of potassium bicarbonate to acrylic acid is 1.5:1, and ammonium persulfate and sodium bisulfite are continuously added into the system, and the ratio of the weight of ammonium persulfate, sodium sulfite to the sum of the weight of acrylic acid and acrylamide is 2:1:850. After the addition is completed, stir for 3 hours at a temperature of 70°C, and cool to room temperature after the reaction is completed to obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a fermentation liquid of metabolites prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is potassium chloride and potassium nitrate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, and the nitrogen content is greater than or equal to 28%. The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:3.7. The mass ratio of component A to component B is 9:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 6:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 10:4:1.

[0043] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flooding; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flooding; the time interval between using component B and component A is 4 hours.

[0044] Example 3

[0045] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 8 parts of potassium fertilizer, 5 parts of ammonium polyphosphate, 26 parts of liquid slow-release nitrogen, 11 parts of mineral humic acid, 6 parts of soil pH buffer, 0.6 parts of permeabilizer, 1.3 parts of composite trace elements and 37 parts of water; the B component comprises the following raw materials in parts by weight: 6 parts of soil loosening agent, 10 parts of soil awakening agent, 1.3 parts of polyglutamic acid and 0.3 parts of permeabilizer; the soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve for 10 minutes at room temperature; and then adding EDTA-Na , urea is added into the system, the ratio of EDTA-Na, urea and distilled water is 1:1:6500; then potassium bicarbonate is added into the system, the ratio of potassium bicarbonate to acrylic acid is 1.25:1, ammonium persulfate and sodium bisulfite are continuously added into the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:650, after the addition is completed, stir for 3 hours at a temperature of 65°C, cool to room temperature after the reaction is completed, and the finished loosening agent is obtained; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a fermentation liquid of metabolites prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:3. The mass ratio of component A to component B is 6.5:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 5:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 7:4:1.

[0046] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 2.5 hours.

[0047] Example 4

[0048] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil and a fertilizing method thereof. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 8 parts of potassium fertilizer, 5 parts of ammonium polyphosphate, 24 parts of liquid slow-release nitrogen, 8 parts of mineral humic acid, 4 parts of soil pH buffer, 0.3 parts of permeating agent, 0.9 parts of composite trace elements and 34 parts of water; and the B component comprises the following raw materials in parts by weight: 5 parts of soil loosening agent, 8 parts of soil awakening agent, 0.7 parts of polyglutamic acid and 0.2 parts of permeating agent. The soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve at room temperature for 10 minutes; then adding EDTA-Na and urea to the system, the ratio of EDTA-Na, urea and distilled water is 1:1:8000; then adding potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1.3:1, and continuing to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:550, stirring for 3 hours at a temperature of 63°C after the addition is completed, cooling to room temperature after the reaction is completed, and obtaining the finished soil loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is potassium chloride, potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The composite trace element is a combination of EDTA zinc, EDTA manganese, EDTA copper, boric acid, and ferrous citrate. The mass ratio of component A to component B is 8:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 6:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 9:4:1.

[0049] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, the fertilizing method comprising the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 1 hour.

[0050] Example 5

[0051] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil and a fertilizing method thereof. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 10 parts of potash fertilizer, 6 parts of ammonium polyphosphate, 27 parts of liquid slow-release nitrogen, 13 parts of mineral humic acid, 6 parts of soil pH buffer, 0.05 parts of permeating agent, 1.6 parts of composite trace elements and 38 parts of water; the B component comprises the following raw materials in parts by weight: 58 parts of soil loosening agent, 13 parts of soil awakening agent, 1.5 parts of polyglutamic acid and 0.4 parts of permeating agent. The soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting, stirring and dissolving at room temperature for 10 minutes; then adding EDTA-Na and urea to the system, the ratio of EDTA-Na, urea and distilled water is 1:1:7000; then adding potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1:1, and continuing to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:600, stirring for 3 hours at a temperature of 67°C after the addition is completed, cooling to room temperature after the reaction is completed, and obtaining the finished soil loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is a combination of potassium chloride and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The composite trace element is a combination of EDTA zinc, EDTA copper, boric acid, and ferrous citrate. The mass ratio of component A to component B is 5:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 5:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 6:4:1.

[0052] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, the fertilizing method comprising the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 3 hours.

[0053] Example 6

[0054] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil and a fertilizing method thereof. The special liquid fertilizer for lettuce comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 9 parts of potassium fertilizer, 5.5 parts of ammonium polyphosphate, 25.5 parts of liquid slow-release nitrogen, 10.5 parts of mineral humic acid, 5 parts of soil pH buffer, 0.4 parts of permeating agent, 1.3 parts of composite trace elements and 36 parts of water; and the B component comprises the following raw materials in parts by weight: 6.5 parts of soil loosening agent, 10 parts of soil awakening agent, 1.1 parts of polyglutamic acid and 0.3 parts of permeating agent. The soil loosening agent comprises distilled water, acrylamide and acrylic acid in a mass ratio of 45:3:2, reacting, stirring and dissolving at room temperature for 10 minutes; then adding EDTA-Na and urea to the system, the ratio of EDTA-Na, urea and distilled water is 1:1:7000; then adding potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1.1:1, continuing to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:700, stirring for 3 hours at a temperature of 62°C after the addition is completed, cooling to room temperature after the reaction is completed, and obtaining the finished soil loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting and filtering spores of Streptomyces freundii. The potash fertilizer is a combination of potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The composite trace element is a combination of EDTA zinc, EDTA manganese, EDTA copper, and boric acid. The mass ratio of component A to component B is 7:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 4:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 6:4:1.

[0055] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, the fertilizing method comprising the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 2 hours.

[0056] Example 7

[0057] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil, comprising an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 9 parts of potash fertilizer, 5 parts of ammonium polyphosphate, 25 parts of liquid slow-release nitrogen, 10 parts of mineral humic acid, 5 parts of soil pH buffer, 0.4 parts of permeabilizer, 1.4 parts of composite trace elements, and 36 parts of water; the B component comprises the following raw materials in parts by weight: 8 parts of soil loosening agent, 10 parts of soil awakening agent, 1.0 parts of polyglutamic acid, and 0.4 parts of permeabilizer; the soil loosening agent comprises distilled water, acrylamide, and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve for 10 minutes at room temperature; then EDTA-Na and urea are added to the mixture, and the mixture is stirred and dissolved for 10 minutes. Add EDTA-Na, urea and distilled water to the system in a ratio of 1:1:8500; then add potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1.15:1, continue to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:800, after the addition is completed, heat to 65°C, stir and react for 3 hours, cool to room temperature after the reaction is completed, and obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting, filtering and the like of Streptomyces freundii spores. The potash fertilizer is a combination of potassium chloride and potassium nitrate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:2.8. The mass ratio of component A to component B is 6:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 5:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 6:4:1.

[0058] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5 h.

[0059] Example 8

[0060] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil, comprising an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 8 parts of potassium fertilizer, 6 parts of ammonium polyphosphate, 26 parts of liquid slow-release nitrogen, 12 parts of mineral humic acid, 5 parts of soil pH buffer, 0.5 parts of permeating agent, 1.4 parts of composite trace elements, and 35 parts of water; the B component comprises the following raw materials in parts by weight: 8 parts of soil loosening agent, 11 parts of soil awakening agent, 1.5 parts of polyglutamic acid, and 0.4 parts of permeating agent; the soil loosening agent comprises distilled water, acrylamide, and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve for 10 minutes at room temperature; then EDTA-Na and urea are added to the mixture, and the mixture is stirred and dissolved for 10 minutes. Add EDTA-Na, urea and distilled water to the system in a ratio of 1:1:8500; then add potassium bicarbonate to the system, the ratio of potassium bicarbonate to acrylic acid is 1.15:1, continue to add ammonium persulfate and sodium bisulfite to the system, the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:800, after the addition is completed, heat to 65°C, stir and react for 3 hours, cool to room temperature after the reaction is completed, and obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting, filtering and the like of Streptomyces freundii spores. The potash fertilizer is a combination of 8 potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%. The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:3.5. The mass ratio of component A to component B is 7:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 5:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 6:4:1.

[0061] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5 h.

[0062] Example 9

[0063] The invention discloses a special liquid fertilizer for lettuce suitable for planting in alkaline soil, comprising an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 10 parts of potash fertilizer, 6 parts of ammonium polyphosphate, 27 parts of liquid slow-release nitrogen, 8 parts of mineral humic acid, 5.5 parts of soil pH buffer, 0.45 parts of penetrant, 1.4 parts of composite trace elements, and 34 parts of water; the B component comprises the following raw materials in parts by weight: 7.5 parts of soil loosening agent, 12.5 parts of soil awakening agent, 1.0 parts of polyglutamic acid, and 0.4 parts of penetrant; the soil loosening agent comprises distilled water, acrylamide, and acrylic acid in a mass ratio of 45:3:2, reacting and stirring to dissolve for 10 minutes at room temperature; and then adding EDTA-N a. Urea is added to the system, and the ratio of EDTA-Na, urea and distilled water is 1:1:8500; then potassium bicarbonate is added to the system, and the ratio of potassium bicarbonate to acrylic acid is 1.15:1, and ammonium persulfate and sodium bisulfite are continued to be added to the system, and the ratio of the sum of the weight of ammonium persulfate, sodium sulfite and acrylic acid and acrylamide is 2:1:800. After the addition is completed, the temperature is raised to 65°C, stirred for reaction for 3 hours, and cooled to room temperature after the reaction is completed to obtain the finished loosening agent; the penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the soil awakening agent is a metabolite fermentation liquid prepared by culturing, inoculating, fermenting, filtering, etc. of Streptomyces freundii spores. The potash fertilizer is a combination of two or more of potassium chloride, potassium nitrate and potassium pyrophosphate; the viscosity-average molecular weight of the polyglutamic acid is 200,000 to 3.5 million. The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, in which the nitrogen content is greater than or equal to 28%. The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid, and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid, and ferrous citrate is 1:2:1:3. The mass ratio of component A to component B is 6:1. The pH buffer is composed of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 6:1. The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether, and sodium dodecylbenzene sulfonate is 8:4:1.

[0064] The present invention also provides a fertilizing method for a liquid fertilizer specially used for lettuce planted in alkaline soil, which is characterized in that the fertilizing method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5 h.

[0065] Test Example 1

[0066] Comparative Example 1

[0067] A liquid fertilizer, as described in Example 7, except that: the pH buffer in component A in Example 7 is replaced by potassium dihydrogen phosphate (in this state, the fertilizer has no pH buffering function); the other raw material compositions are the same as in Example 7.

[0068] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0069] Comparative Example 2

[0070] A liquid fertilizer, as described in Example 7, except that the soil loosening agent of component B is removed; the other raw material compositions are the same as those of Example 7.

[0071] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0072] Comparative Example 3

[0073] A liquid fertilizer, as described in Example 7, except that the soil awakening agent of component B is removed; the other raw material compositions are the same as those of Example 7.

[0074] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0075] Comparative Example 4

[0076] A liquid fertilizer, as described in Example 7, except that the penetrants of component A and component B in Example 1 are removed; and the other raw material compositions are the same as those in Example 7.

[0077] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0078] Comparative Example 5

[0079] A liquid fertilizer, as described in Example 7, except that the penetrant of component B in Example 7 is removed; the other raw material compositions are the same as those in Example 7.

[0080] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0081] Comparative Example 6

[0082] A liquid fertilizer, as described in Example 7, except that the soil loosening agent, soil awakening agent and polyglutamic acid in component B are removed; the other raw material compositions are the same as those in Example 7.

[0083] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0084] Comparative Example 7

[0085] A liquid fertilizer, as described in Example 7, except that the polyglutamic acid of component B is removed; the other raw material compositions are the same as those of Example 7.

[0086] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0087] Comparative Example 8

[0088] A liquid fertilizer, as described in Example 7, except that: the liquid slow-release nitrogen in component A in Example 7 is replaced by urea; and the other raw material compositions are the same as in Example 7.

[0089] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0090] Comparative Example 9

[0091] A liquid fertilizer, as described in Example 7, except that component A and component B are mixed before use; and the other raw material compositions are the same as those in Example 7.

[0092] The preparation method of the above-mentioned liquid fertilizer is the same as that of Example 7.

[0093] Test example 1: Verification of agricultural test results

[0094] Test situation: The test site is Maotan Village, Qiliying Town, Xinxiang City, Henan Province. The local soil pH is 8.05 and the irrigation water pH is 8.3. There are 12 treatments in the test, each with 3 replicates, and the final yield data is averaged.

[0095] The test treatment is as follows:

[0096] T1: the product of Example 7 above.

[0097] T2: the product of Example 8 above.

[0098] T3: the product of Example 9 above.

[0099] CK-1: the product of Comparative Example 1 above.

[0100] CK-2: the product of Comparative Example 2 above.

[0101] CK-3: the product of Comparative Example 3 above.

[0102] CK-4: the product of Comparative Example 4 above.

[0103] CK-5: the product of Comparative Example 5 above.

[0104] CK-6: the product of Comparative Example 6 above.

[0105] CK-7: the product of Comparative Example 7 above.

[0106] CK-8: the product of Comparative Example 8 above.

[0107] CK-9: the product of Comparative Example 9 above.

[0108] No base fertilizer was applied in the above test treatments. The above different treatment fertilizers were applied after the lettuce seedlings grew to four leaves and one heart. All treatments were drip-irrigated with 8L / mu / time of component A and 1.5L / mu / time of component B. Except for CK-9, which was mixed with component A and component B, the other treatments applied component B first and then component A. The fertilization interval of the two components was 0.5h. The interval between each application of component A was 7-10 days. A total of 3 fertilizations were applied during the test period. After harvest, the yield was measured and the average value was calculated. At the same time, the root index and the nitrate and VC content of the leaves were measured. The data are recorded in Table 1. In addition, the soil of each treatment after the test was taken to detect the soil porosity and the number of beneficial microorganisms and record the data in Table 2.

[0109] Table 1 Effects of different treatments on lettuce growth

[0110]

[0111] As can be seen from the data in Table 1, the yield of Comparative Example 1 is reduced by 6.46% compared with Example 7, the corresponding nitrate content is increased, the VC content is reduced, and the root growth indicators are all reduced, indicating that after the pH buffer is replaced by potassium dihydrogen phosphate, due to the lack of pH buffering improvement, the efficiency of root absorption of nutrients is reduced, resulting in the growth of lettuce being affected. Comparative Examples 2, 3, 5, 6, and 7 are all reduced in yield compared with Example 7, with a reduction range of 5.92-14.92%, and the fresh weight, surface area, and root volume of the root system are also greatly reduced, indicating that the lack of any functional component in component B will affect the root growth of lettuce, thereby causing a reduction in yield. Comparative Example 4 has a 9.51% reduction in yield compared with Example 7, and a 2.67% reduction in yield compared with Comparative Example 5, and the root growth indicators are also reduced, indicating that the lack of soil permeation agent in any component of components A and B affects the growth of lettuce. Compared with Example 7, the yield of Comparative Example 8 was reduced by 2.85%, but the nitrate content was significantly increased and the VC content was significantly reduced, indicating that after the liquid slow-release nitrogen was replaced with urea, a large amount of nitrate was produced in the later conversion and absorption process of urea, resulting in the accumulation of nitrate content in the lettuce leaves, thereby significantly reducing the quality of the lettuce. Compared with Example 7, the yield of Comparative Example 9 was reduced by 4.67%, indicating that the effect of using components A and B separately is better than that of using them together.

[0112] Table 2 Effects of different treatments on soil porosity and beneficial microorganisms

[0113] deal with Soil porosity % Number of bacteria (10,000 / g) Actinomycetes (10,000 / g) Bacillus(10,000 / g) T1 55.85 1570 165 30 T2 56.60 1500 153 29 T3 55.48 1630 169 24 CK-1 55.83 1405 138 19 CK-2 51.32 1395 126 16 CK-3 54.08 1206 76 9 CK-4 54.35 1530 145 17 CK-5 54.21 1500 129 16 CK-6 50.99 1150 65 7 CK-7 52.75 1350 119 15 CK-8 56.32 1500 149 20 CK-9 54.28 1490 133 18

[0114] As can be seen from the data in Table 2, Example 7 significantly improves the soil porosity compared to Comparative Example 2, indicating that the loosening agent helps to improve the soil porosity. The soil porosity of Comparative Example 6 is lower than that of Comparative Example 2, Comparative Example 3, and Comparative Example 7, indicating that the synergistic use of loosening agents, soil awakening agents, and polyglutamic acid is better than using a single component. Comparative Examples 3 and Comparative Example 6 are significantly lower in the number of soil bacteria, actinomycetes, and Bacillus than Example 7, indicating that the soil awakening agent helps the reproduction of beneficial microorganisms in the soil, and the number of soil microorganisms in Comparative Example 3 is lower than that in Comparative Example 6, further indicating that the effects of loosening agents, polyglutamic acid, and soil awakening agents in activating beneficial microorganisms in the soil or promoting microbial reproduction are also better than single components.

[0115] Test Example 2: Leaching Test

[0116] Test conditions: The test site is the intelligent glass greenhouse of Henan Xinlianxin Chemical Industry Group. The pH of the test soil is 8.15 and the pH of the irrigation water is 8.3. There are 12 treatments in the test, and 3 replicates are set for each treatment, the same as in Test Example 1. The test leaching column is a glass column with a diameter of 7 cm and a length of 30 cm, with an upper cylindrical shape and a lower conical shape with an embolism. A beaker is set at the outlet below the leaching column to collect the leaching solution. Before the test, a filter plate with holes is placed at the bottom of the leaching column device, a piece of filter paper is placed on the upper end of the filter plate, and 20 cm of test soil is filled on the upper end of the filter paper. Except for the CK-9 treatment, all other treatments first dilute and dissolve the B component at a volume ratio of 1:500, then take 300 mL of the dilution and pour it into the leaching column. After 1 hour, the A component is diluted and dissolved at a volume ratio of 1:500, and then 500 mL of the dilution is poured into the leaching column. For CK-9 treatment, components A and B were mixed first, then diluted and dissolved at a volume ratio of 1:500, and 800 mL of the diluted solution was poured into the leaching column. The pH of the leaching solution was measured and the data were recorded in Table 3.

[0117] Table 3 pH of leaching solution under different treatments

[0118] deal with pH of the solution deal with pH of the solution T1 6.99 CK-4 6.90 T2 7.01 CK-5 6.93 T3 6.98 CK-6 7.01 CK-1 7.91 CK-7 7.06 CK-2 6.99 CK-8 6.89 CK-3 7.02 CK-9 7.01

[0119] It can be seen from the above table that, except for the pH of the leaching solution in Comparative Example 1 which is alkaline, the pH of the leaching solutions of other treatments are all neutral, indicating that the pH buffer has the effect of adjusting the pH of the fertilizer solution, which can ensure that the fertilizer solution reaching the rhizosphere area of ​​the crop presents the neutral state most favored by the crop growth, thereby improving the absorption and utilization efficiency of the elements.

[0120] The test examples described above are part of the test examples of the present invention, rather than all the test examples. The detailed description of the test examples of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected test examples of the present invention. Based on the test examples in the present invention, all other test examples obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A liquid fertilizer for lettuce suitable for planting in alkaline soil, characterized in that: The liquid fertilizer comprises component A and component B. Component A includes the following raw materials in parts by weight: 6-10 parts of potash fertilizer, 4-7 parts of ammonium polyphosphate, 23-29 parts of liquid slow-release nitrogen, 7-15 parts of mineral humic acid, 4-8 parts of soil pH buffer, 0.3-0.8 parts of penetrant, 0.7-2.0 parts of complex trace elements, and 33-40 parts of water; Component B includes the following raw materials in parts by weight: 4-10 parts of soil loosening agent, 6.5-15 parts of soil awakening agent, 0.6-2.0 parts of polyglutamic acid, and 0.1-0.5 parts of penetrant; The soil loosening agent comprises: reacting and stirring distilled water, acrylamide and acrylic acid at a mass ratio of 45:3:2 at room temperature for 10 minutes; then adding EDTA-Na and urea into the system, wherein the ratio of EDTA-Na, urea and distilled water is 1:1:4000-9000; then adding potassium bicarbonate into the system, wherein the ratio of potassium bicarbonate to acrylic acid is 1-1.5:1, and then adding ammonium persulfate and sodium bisulfite into the system, wherein the ratio of the weight of ammonium persulfate, sodium sulfite to the sum of the weight of acrylic acid and acrylamide is 2:1:450-850, stirring for 3 hours at a temperature of 60-70°C after the addition is completed, and cooling to room temperature after the reaction is completed, so as to obtain a finished soil loosening agent; The penetrant is a composition of block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; The soil awakening agent is a fermentation liquid of metabolites prepared by culturing, inoculating, fermenting, filtering and the like of spores of Streptomyces freundii.

2. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: The potash fertilizer is a combination of two or more of potassium chloride, potassium nitrate and potassium pyrophosphate; the viscosity average molecular weight of the polyglutamic acid is 200,000 to 3.5 million.

3. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: The liquid slow-release nitrogen is an organic polymer generated by the reaction of urea and formaldehyde, wherein the nitrogen content is greater than or equal to 28%.

4. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: The composite trace elements are a combination of two or more of EDTA zinc, EDTA manganese, EDTA copper, boric acid and ferrous citrate.

5. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 4, characterized in that: The composite trace element is a composition of EDTA zinc, EDTA manganese, boric acid and ferrous citrate, and the mass ratio of the EDTA zinc, EDTA manganese, boric acid and ferrous citrate is 1:2:1:2.7-3.

7.

6. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 4, characterized in that: The mass ratio of component A to component B is 4 to 9:

1.

7. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: The pH buffer consists of potassium dihydrogen phosphate and potassium hydroxide, and the mass ratio of potassium dihydrogen phosphate to potassium hydroxide is 4-6:

1.

8. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: The mass ratio of the block polyether, fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate is 5-10:4:

1.

9. The liquid fertilizer for lettuce suitable for alkaline soil planting according to claim 1, characterized in that: Component A includes the following raw materials in parts by weight: 8-10 parts of potash fertilizer, 5-6 parts of ammonium polyphosphate, 24-27 parts of liquid slow-release nitrogen, 8-13 parts of mineral humic acid, 4-6 parts of soil pH buffer, 0.3-0.5 parts of penetrant, 0.9-1.6 parts of complex trace elements, and 34-38 parts of water; Component B comprises the following raw materials in parts by weight: 5-8 parts of soil loosening agent, 8-13 parts of soil awakening agent, 0.7-1.5 parts of polyglutamic acid, and 0.2-0.4 parts of penetrant.

10. A method for applying liquid fertilizer for lettuce grown in alkaline soil, characterized in that: The fertilization method comprises the following steps: firstly dissolving component B in water, taking the raw material at 1-1.5 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; then dissolving component A in water, taking the original solution at 5-10 L / mu / time, and then using it for root irrigation, drip irrigation or flood irrigation; the time interval between using component B and component A is 0.5-4 hours.

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