Suspension foliar fertilizer and preparation method thereof

Abstract

The invention belongs to the technical field of foliar fertilizers, and particularly relates to a turbid liquid foliar fertilizer and a preparation method thereof. The method comprises the following steps: grinding natural clinoptilolite serving as a raw material to obtain natural clinoptilolite powder; activating the natural clinoptilolite powder with a sodium chloride solution to obtain activated natural clinoptilolite powder; and adding the activated natural clinoptilolite powder into a conventional foliar fertilizer solution, and uniformly mixing to obtain the suspension foliar fertilizer with a slow release effect. According to the suspension foliar fertilizer provided by the invention, the activated natural clinoptilolite powder is added into the conventional foliar fertilizer solution, so that the concentration of cations introduced into the conventional foliar fertilizer solution is increased, the number of effective nutrient elements of the foliar fertilizer sprayed at a time is increased, and the natural zeolite powder attached to the foliar surface still contains a certain number of nutrient elements; when the leaf surfaces are dewed again or are sprayed and watered, the nutrient elements can be dissolved out from the natural clinoptilolite again by water collected on the leaf surfaces, so that the fertilizer efficiency is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of foliar fertilizers, and in particular relates to a suspension foliar fertilizer and a preparation method thereof. Background Art

[0002] In general, after nitrogen, phosphorus and potassium fertilizers are applied to crop soil, they are often fixed and leached due to factors such as soil acidity, soil moisture content and soil microorganisms, which reduces fertilizer efficiency. Foliar fertilizer is sprayed directly on the leaves to avoid direct contact with the soil, thus avoiding chemical reactions between fertilizer and soil, soil adsorption of fertilizer, and fertilizer loss caused by soil leaching. Foliar fertilization avoids this phenomenon, thus effectively improving fertilizer efficiency.

[0003] Since foliar fertilizer is sprayed directly on the leaves of the aboveground part of crops, the plants have very little buffering effect on the fertilizer, resulting in two obvious shortcomings in the use of existing foliar fertilizers: first, the concentration of the foliar fertilizer solution directly sprayed on the leaves of plants should not be too high. Too high a concentration will often burn the leaves and cause fertilizer damage, while the low concentration of foliar fertilizer solution means that the number of nutrients exposed to crops is relatively small, and the effect of use is not obvious; second, the time period in which foliar fertilizer can be used is limited. Under high temperature and low humidity conditions, the foliar fertilizer solution that remains on the leaves of plants is easy to evaporate. The evaporation of the foliar fertilizer solution produces foliar fertilizer concentrate, which increases the concentration of the foliar fertilizer solution and causes leaf burns. That is, the nutrients in the foliar fertilizer solution must be absorbed by the crops before the solution evaporates to produce foliar fertilizer concentrate. Usually, foliar fertilization should be done on windless and cloudy days or in climatic conditions with high humidity and low evaporation.

[0004] In summary, the existing foliar fertilizer spraying has the problems of low concentration of nutrient elements contained in the foliar fertilizer solution and short spraying action time. Summary of the invention

[0005] Aiming at the problems of low concentration of nutrient elements contained in foliar fertilizer solution and short spraying action time in existing foliar fertilizer spraying, the present invention provides a suspension foliar fertilizer, which increases the concentration of cations introduced into the conventional foliar fertilizer solution and increases the amount of effective nutrient elements in one-time spraying of foliar fertilizer by adding activated natural clinoptilolite powder into the conventional foliar fertilizer solution.

[0006] The present invention is achieved through the following technical solutions: A method for preparing a suspension foliar fertilizer, the method comprising: (1) Preparation of zeolite powder: using natural clinoptilolite as raw material, grinding to obtain natural clinoptilolite powder; (2) zeolite activation: activating the natural clinoptilolite powder with a sodium chloride solution to obtain activated natural clinoptilolite powder; (3) Add the activated natural clinoptilolite powder to the conventional foliar fertilizer solution and mix well to obtain a suspension foliar fertilizer with a slow-release effect.

[0007] Furthermore, in step (1), the natural clinoptilolite crystals used have a pore size range of 0.1 to 1.0 nanometers, a porosity of 20%, and a specific surface area of ​​25 m 2 / g; ion exchange capacity ≥1.2 mmol / g and adsorption capacity ≥0.1cm 3 / g.

[0008] Furthermore, in step (1), the particle size of the natural clinoptilolite powder prepared satisfies: D99≦76 μm, D50≦36 μm.

[0009] Furthermore, step (2) is specifically as follows: adding the natural clinoptilolite powder to a saturated sodium chloride solution for ion activation, and the immersion time is more than 24 hours; after the ion activation is completed, removing the sodium chloride solution, adding clean water to wash repeatedly until the sodium chloride concentration in the washing liquid is less than 3 mg / l, and naturally air-drying until the surface is free of water to obtain the activated natural clinoptilolite powder.

[0010] Furthermore, in step (4), in the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.3-0.5%.

[0011] A suspension foliar fertilizer comprises a conventional foliar fertilizer solution and activated natural clinoptilolite powder.

[0012] Furthermore, in the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.3-0.5%.

[0013] Furthermore, the conventional foliar fertilizer solution includes any one or more combinations of potassium dihydrogen phosphate solution, high nitrogen water-soluble fertilizer containing ammonium nitrogen, sugar alcohol calcium foliar fertilizer solution, calcium chloride foliar fertilizer solution, and trace element foliar fertilizer solution.

[0014] Furthermore, the mass percentage concentration of potassium dihydrogen phosphate in the potassium dihydrogen phosphate solution is 0.1-0.3%; the mass percentage concentration of nitrogen fertilizer in the high-nitrogen water-soluble fertilizer containing ammonium nitrogen is 0.5-2.5%, the mass percentage concentration of sugar alcohol calcium in the sugar alcohol calcium or calcium chloride foliar fertilizer solution is 0.5-5.0%, the mass percentage concentration of calcium chloride in the calcium chloride foliar fertilizer solution is 0.5-5.0%, and the mass percentage concentration of trace elements in the trace element foliar fertilizer solution is 0.1-1.0%.

[0015] Furthermore, the suspension foliar fertilizer is sprayed on the leaves of plants at a dosage of 200 to 400 liters per hectare.

[0016] Beneficial technical effects of the present invention: The suspension foliar fertilizer provided by the invention increases the concentration of cations introduced into the conventional foliar fertilizer solution and increases the amount of effective nutrient elements in the one-time spraying of the foliar fertilizer by adding activated natural clinoptilolite powder into the conventional foliar fertilizer solution.

[0017] The suspension foliar fertilizer provided by the present invention is added with activated natural clinoptilolite powder. When the foliar solution is completely evaporated, the natural zeolite powder attached to the leaf surface still contains a certain amount of nutrient elements. When the leaf surface is dewed or sprayed with water again, the water retained on the leaf surface can dissolve the nutrient elements from the natural clinoptilolite again, thereby prolonging the fertilizer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a method for preparing a suspension foliar fertilizer in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

[0021] In order to solve the problems mentioned in the prior art that the foliar fertilizer spraying has low concentration of nutrient elements contained in the foliar fertilizer solution and short spraying action time, the present invention provides a suspension foliar fertilizer and a preparation method thereof.

[0022] Embodiment 1: A method for preparing a suspension foliar fertilizer, such as Figure 1 Said method comprises: (1) Preparation of zeolite powder: using natural clinoptilolite as raw material, grinding to obtain natural clinoptilolite powder; (2) zeolite activation: activating the natural clinoptilolite powder with a sodium chloride solution to obtain activated natural clinoptilolite powder; (3) Add the activated natural clinoptilolite powder to the conventional foliar fertilizer solution and mix well to obtain a suspension foliar fertilizer with a slow-release effect.

[0023] In step (1) of this embodiment, the pore size of the natural clinoptilolite crystals used is in the range of 0.1 to 1.0 nanometers, the porosity is ≥ 20%, and the specific surface area is ≥ 25 m 2 / g; ion exchange capacity ≥1.2 mmol / g and adsorption capacity ≥0.1cm 3 / g. Preferably, the crystals of the natural clinoptilolite used are in the form of flakes or plates, and the aggregates of the natural clinoptilolite are in the form of radial, hair-like, and porous structures.

[0024] In step (1) of this embodiment, the particle size of the natural clinoptilolite powder prepared satisfies: D99≦76 μm, D50≦36 μm.

[0025] The reason why the particle size of natural clinoptilolite powder needs to be controlled is that, on the one hand, after the particle size of natural zeolite is reduced by grinding, the specific surface area of ​​natural zeolite increases, and the diffusion path of conventional foliar fertilizer solution into the natural zeolite pores is shortened, which can increase the effective space of concentration polarization and increase the speed of ion exchange reaction. On the other hand, after the suspension is sprayed on the leaf surface, the natural zeolite powder is deposited on the leaf surface to form a layer of micronized film, which can close the pores of the plant and reduce the evaporation of water from the plant, prolong the low concentration state of cations introduced by the conventional foliar fertilizer solution, and improve the absorption effect of the conventional foliar fertilizer solution. At the same time, the particle size of natural clinoptilolite powder close to the micropores on the leaf surface can effectively improve the adhesion of natural zeolite powder on the leaf surface, and then realize that when the water of the conventional foliar fertilizer solution evaporates, the micronized film formed by the natural zeolite powder deposited on the leaf surface will absorb the residual cations and store them. When the plant leaf surface obtains water again (such as condensation, spraying, rainfall), the residual cations stored in the micronized film will be released again.

[0026] Step (2) of this embodiment is specifically as follows: adding the natural clinoptilolite powder to a saturated sodium chloride solution for ion activation, and the immersion time is more than 24 hours; after the ion activation is completed, removing the sodium chloride solution, adding clean water to wash repeatedly until the sodium chloride concentration in the washing is lower than 3 mg / l, and naturally air-drying until the surface is free of water to obtain the activated natural clinoptilolite powder.

[0027] In step (4) of this embodiment, the mass percentage concentration of the activated natural clinoptilolite powder in the suspension foliar fertilizer is 0.3-0.5%. Specifically, after preparing the conventional foliar fertilizer solution, the activated natural clinoptilolite powder is added and vigorously stirred to obtain the suspension foliar fertilizer.

[0028] In this embodiment, the conventional foliar fertilizer solution includes any one or more combinations of potassium dihydrogen phosphate solution, high nitrogen water-soluble fertilizer containing ammonium nitrogen, sugar alcohol calcium solution, and trace element foliar fertilizer solution.

[0029] In the present invention, the chemical formula of the natural clinoptilolite used is Na(AlSi5O 12 )·4H2O, a super-large negatively charged matrix composed of silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons. In order to maintain neutrality, positively charged cations are bound to the surface of the super-large negatively charged matrix. Under natural conditions, positively charged cations can be alkali metal and alkaline earth metal ions, such as Na, Ca, Sr, Ba, K, Mg and other metal ions. Under aqueous solution conditions, cations on the surface of the super-large negatively charged matrix can undergo ion exchange with other cations in the aqueous solution. The ion exchange capacity of natural clinoptilolite is the maximum capacity for ion exchange between cations on the surface of the super-large negatively charged matrix and other cations in the aqueous solution under aqueous solution conditions.

[0030] In the present invention, the natural clinoptilolite powder is activated by sodium chloride solution. After the original cation (M1) on the surface of the natural clinoptilolite is activated by the sodium chloride solution, M1 is converted into Na + .

[0031] After the activated natural clinoptilolite powder is added to the conventional foliar fertilizer solution, the original cations on the surface of the natural clinoptilolite exchange with other cations in the water body of the conventional foliar fertilizer solution, so that the water ion concentration on the surface of the natural clinoptilolite micropores is enriched, thereby adsorption concentration polarization occurs. After concentration polarization occurs, a high-concentration space of water ions appears on the surface of the natural clinoptilolite micropores, especially the solution inside the natural clinoptilolite micropores becomes a high-concentration space of water ions.

[0032] Ion exchange and concentration polarization effectively reduce the concentration of cations introduced by conventional foliar fertilizer solutions in the solution water body, and natural clinoptilolite becomes a buffer zone for the introduction of cations into conventional foliar fertilizer solutions, that is, the ion exchange of natural clinoptilolite itself and the high concentration of conventional foliar fertilizer solutions bound inside the micropores of natural zeolite introduce the cation solution, and a part of the cations introduced by the conventional foliar fertilizer solution is "stored in a warehouse", so that the apparent concentration of the cations introduced into the water body of the conventional foliar fertilizer solution is reduced. As the plant leaves absorb the cations introduced by the conventional foliar fertilizer solution, the apparent concentration of the cations introduced into the water body of the plant leaves decreases, and the cations introduced by the conventional foliar fertilizer solution "stored in a warehouse" by natural clinoptilolite are released to the water body of the plant leaves. Therefore, natural clinoptilolite plays the role of a "slow-release agent" for the introduction of cations into the conventional foliar fertilizer solution. In this way, the addition of natural zeolite powder can moderately increase the concentration of cations introduced by the conventional foliar fertilizer solution and increase the number of effective nutrients in a one-time spraying of foliar fertilizer. When the solution on the leaves has completely evaporated, the natural zeolite powder attached to the leaves still contains a certain amount of nutrients. When dew condenses on the leaves or is sprayed with water again, the water retained on the leaves can dissolve nutrients from the natural clinoptilolite again, thereby prolonging the fertilizer effect.

[0033] Specifically, the cations on the surface of natural clinoptilolite undergo the following ion exchange reaction with conventional foliar fertilizer solution: R-M1+M2 ⇌R-M2+M1; Where: R: a super-large negatively charged matrix composed of silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons; M1: the original cations on the surface of natural clinoptilolite, which are activated by sodium chloride solution and then replaced by Na + ; M2: cation introduced by conventional foliar fertilizer solution. If the conventional foliar fertilizer solution is potassium dihydrogen phosphate solution, M2 is K + If the conventional foliar fertilizer solution is a high nitrogen water-soluble fertilizer containing ammonium nitrogen, then M2 is NH4 + If the conventional foliar fertilizer solution is a sugar alcohol calcium solution, then M2 is Ca 2+ If the conventional foliar fertilizer solution contains trace elements such as iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), and magnesium (Mg), then M2 includes Fe 2+ , Mn 2+ 、Zn 2+ , Cu 2+ Mg 2+ If the foliar fertilizer solution is a combination of multiple conventional foliar fertilizer solutions, then M2 is K + , NH4 + , Ca 2+ , a combination of trace elements, etc.

[0034] Example 2: A suspension foliar fertilizer is prepared by the method described in Example 1, wherein the suspension foliar fertilizer comprises a conventional foliar fertilizer solution and activated natural clinoptilolite powder added to the conventional foliar fertilizer solution.

[0035] In this embodiment, in the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.3-0.5%.

[0036] In this embodiment, the conventional foliar fertilizer solution includes any one or more combinations of potassium dihydrogen phosphate solution, high nitrogen water-soluble fertilizer containing ammonium nitrogen, sugar alcohol calcium foliar fertilizer solution, calcium chloride foliar fertilizer solution, and trace element foliar fertilizer solution.

[0037] In this embodiment, the mass percentage concentration of potassium dihydrogen phosphate in the potassium dihydrogen phosphate solution is 0.1-0.3%; the mass percentage concentration of nitrogen fertilizer in the high nitrogen water-soluble fertilizer containing ammonium nitrogen is 0.5-2.5%, the mass percentage concentration of calcium sugar alcohol in the calcium sugar alcohol or calcium chloride foliar fertilizer solution is 0.5-5.0%, the mass percentage concentration of calcium chloride in the calcium chloride foliar fertilizer solution is 0.5-5.0%, and the mass percentage concentration of trace elements in the trace element foliar fertilizer solution is 0.1-1.0%.

[0038] The suspension foliage fertilizer is sprayed on the leaves of plants at a dosage of 200 to 400 liters per hectare. Preferably, the suspension foliage fertilizer is directly sprayed on the leaves of plants using a sprayer, and the suspension should be continuously disturbed during the spraying process to avoid the sedimentation of solid particles in the suspension.

[0039] Example 3: Foliar fertilizer was applied to a certain variety of grapes, and an experimental group and a control group were set up.

[0040] The control group was sprayed with 0.3% potassium dihydrogen phosphate every 5 days; Experimental group: using the suspension foliar fertilizer provided by the present invention, the suspension foliar fertilizer includes a conventional foliar fertilizer solution and activated natural clinoptilolite powder; the conventional foliar fertilizer solution in the experimental group is specifically a potassium dihydrogen phosphate foliar fertilizer solution; the conventional foliar fertilizer solution in the suspension foliar fertilizer uses a potassium dihydrogen phosphate foliar fertilizer solution with a mass percentage concentration of 0.35%; in the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.45%; After the first spraying, spray for the second time after 8 days, with a concentration of 0.32% potassium dihydrogen phosphate. Depending on the amount of natural zeolite powder remaining on the leaves, add natural zeolite powder at a mass percentage concentration of 0.05-0.15%. After an interval of 8 days, add natural zeolite powder at a mass percentage concentration of 0.05-0.15% to continue spraying, and so on. Use a sprayer to spray the suspension on the plant leaves at a dosage of 200-400 liters / hectare, and continue to disturb the spraying process to prevent the solid particles in the suspension from settling.

[0041] During the entire spraying cycle, the spraying volume of the experimental group was about 30% lower than that of the control group.

[0042] The results of the experimental group compared with the control group are as follows: The weight of berries increased by 3-16%; the volume of berries increased by 17-27%; the number of grape bunches increased by 5-8%; the weight of grape bunches increased by 10-21%; the sugar content increased by 3%; the fresh weight of leaves increased by 17-19%; the leaf area increased by 3-10%; and the harvest period was advanced by 1-4 days.

[0043] The control group used 0.3% potassium dihydrogen phosphate, and its ion concentration was: K + :0.022mmol / l, H2PO4 - :0.022mmol / l, The experimental group used 0.35% potassium dihydrogen phosphate, and its ion concentration was: K + :0.026mmol / l, H2PO4 - :0.026mmol / l, add natural zeolite powder at a mass percentage concentration of 0.45%, stir vigorously to obtain a suspension foliar fertilizer, let the suspension foliar fertilizer stand for 1 hour, take the supernatant to measure the ion concentration, K+ :0.020mmol / l, H2PO4 - :0.022mmol / l,Na + :0.002mmol / l. It can be seen that the natural zeolite powder effectively reduces the ion concentration of the clear liquid through ion exchange and high-concentration adsorption of concentration polarization on the inner and outer surfaces of the particles, and the "retention" of high-concentration solutions on the surface and in the pores.

[0044] According to the dosage of 200-400 liters / hectare, a conventional method of spraying a simple 0.3% potassium dihydrogen phosphate solution foliar fertilizer on the plant leaves is usually completed before 9:00, and the water droplets on the leaves are basically disappeared by 12:00, that is, the effective action time of the foliar fertilizer is only 3 hours; under the same conditions, a sprayer is used to spray a suspension foliar fertilizer consisting of a 0.35% potassium dihydrogen phosphate solution of the present invention and 0.45% supplemented natural zeolite powder on the plant leaves, and the spraying is also completed before 9:00, and the water droplets on the leaves disappear by 13:00, that is, the effective action time of the foliar fertilizer is extended to 4 hours. The principle is that the high-concentration solution "retained" on the surface and pores of the natural zeolite powder can effectively absorb the water evaporated from the leaf surface, thereby extending the retention time of the water droplets on the leaf surface.

[0045] After 4:00 p.m., the leaves were picked and the attached materials on the leaf surface were washed with water. The amount of natural zeolite powder collected was equivalent to 0.4-0.45 mg / m 2 On the second day, at the same time, the amount of natural zeolite powder equivalent to leaf surface area was measured to be 0.35-0.40 mg / m 2 , indicating that the powder has good adhesion on the leaf surface, indicating that the particle size is appropriate. After spraying the suspension foliar fertilizer, the next day and subsequent dates, the natural zeolite powder particles obtain moisture on the leaf surface again (such as condensation, spraying, rainfall), and the residual cations stored in the micronized film are released again, thereby prolonging the fertilizer effect.

[0046] Example 4: Foliar fertilizer was applied to tomatoes grown on a certain glass greenhouse, and an experimental group and a control group were set up.

[0047] The control group used 0.2% potassium dihydrogen phosphate, 0.5% urea, 0.2% borax, 0.5% calcium chloride, 0.1% EDTA-iron (Fe), 0.05% EDTA-manganese (Mn), 0.05% EDTA-zinc (Zn), and 0.05% EDTA-copper (Cu), which were fully mixed and dissolved and sprayed once every 8 days.

[0048] Experimental group: using the suspension foliar fertilizer provided by the present invention, the suspension foliar fertilizer comprises a conventional foliar fertilizer solution and activated natural clinoptilolite powder; natural zeolite powder is added according to a mass percentage concentration of 0.40%, the concentration of potassium dihydrogen phosphate in the conventional foliar fertilizer solution is increased to 0.25%, 0.5% urea is changed to 0.8% ammonium nitrate, 0.5% calcium chloride is increased to 0.75%, 0.1% EDTA-iron (Fe), 0.05% EDTA-manganese (Mn), 0.05% EDTA-zinc (Zn), and 0.05% EDTA-copper (Cu) are increased to 0.15%, 0.075%, 0.075%, and 0.075%, respectively.

[0049] The present invention adds natural zeolite powder at a mass percentage concentration of 0.40%, and vigorously stirs to obtain a suspension foliar fertilizer. After the suspension foliar fertilizer is left to stand for 1 hour, the supernatant is taken to measure the ion concentration. The test results are as follows: name Potassium dihydrogen phosphate Ammonium Nitrate Borax Calcium chloride EDTA-Fe EDTA-Mn EDTA-Zn EDTA-Cu Concentration before adding natural zeolite powder (wt.%) 0.25 0.8 0.2 0.75 0.15 0.75 0.75 0.75 Cation mole (mmol / l) 18.37 0.2 0.0105 0.051 0.0044 0.0219 0.0212 0.0213 After adding natural zeolite powder, the ion concentration of the supernatant is expressed as a percentage by weight (wt.%) 0.19 0.64 0.19 0.49 0.08 0.38 0.38 0.38 Cation mole (mmol / l) 13.86 0.16 0.01 0.03 0.00 0.01 0.01 0.01 "Retention" amount of high concentration solution on the surface and in the pores of natural zeolite powder (mmol / l) 4.5106 0.0400 0.0005 0.0179 0.0022 0.0110 0.0106 0.0107 "Retention" ratio of high concentration solution on the surface and in the pores of natural zeolite powder (%) 0.25 0.20 0.05 0.35 0.50 0.50 0.50 0.50 From the test results, it can be seen that the addition of natural zeolite powder has a stronger sustained-release effect on trace elements such as iron, manganese, zinc, and copper, and is obvious in avoiding the possible side effects of high concentrations of trace elements.

[0050] The suspension is sprayed on the leaves of plants at a dosage of 200 to 400 liters per hectare using a sprayer, and the spraying process continues to disturb to prevent the solid particles in the suspension from settling. The solution foliar fertilizer prepared by conventional methods is sprayed on the leaves of plants using a sprayer, and the spraying is usually completed before 9:00. The water droplets on the leaves are basically gone by 12:00, that is, the effective action time of the foliar fertilizer is only 3 hours; under the same conditions, the suspension foliar fertilizer containing 0.40% added natural zeolite powder is sprayed on the leaves of plants using a sprayer, and the spraying is also completed before 9:00. The water droplets on the leaves disappear at 13:00, that is, the effective action time of the foliar fertilizer is extended to 4 hours. The principle is that the high-concentration solution "retained" on the surface and pores of the natural zeolite powder can effectively absorb the water evaporated from the leaves, thereby extending the retention time of the water droplets on the leaves.

[0051] After 4:00 p.m., the leaves were picked and the attached materials on the leaf surface were washed with water. The amount of natural zeolite powder collected was equivalent to 0.45-0.50 mg / m 2 On the second day, at the same time, the amount of natural zeolite powder equivalent to leaf surface area was measured to be 0.40-0.45 mg / m 2 , indicating that the powder has good adhesion on the leaf surface, indicating that the particle size is appropriate.

[0052] In this way, after spraying the suspension foliar fertilizer, on the next day and subsequent dates, the natural zeolite powder particles obtain moisture on the leaf surface again (such as condensation, spraying, rainfall), and the residual cations stored in the micronized film are released again, thereby prolonging the fertilizer effect.

[0053] The suspension foliar fertilizer obtained by vigorous stirring should be sprayed for the second time 10 to 12 days after the first spraying. Depending on the amount of natural zeolite powder remaining on the leaves, the mixed foliar fertilizer solution is 0.22% potassium dihydrogen phosphate, 0.65% ammonium nitrate, 0.65% calcium chloride, 0.12% EDTA-iron (Fe), 0.065% EDTA-manganese (Mn), 0.065% EDTA-zinc (Zn), 0.065% EDTA-copper (Cu). Natural zeolite powder is added at a mass percentage concentration of 0.05 to 0.10%. After an interval of 10 to 12 days, additional natural zeolite powder is added at a mass percentage concentration of 0.05 to 0.10% and spraying is continued, and so on.

[0054] During the entire spraying cycle, the spraying volume of the experimental group was about 15% lower than that of the control group.

[0055] The practical effects of the experimental group after using the suspension foliar fertilizer of the present invention and the control group using the original conventional foliar fertilizer are compared as follows: the weight of berries increases by 10-20%; the volume of berries increases by 15-30%; the number of tomato bunches increases by 6-10%; the weight of tomato bunches increases by 15-25%; the sugar content increases by 3-5%; the fresh weight of leaves increases by 15-25%; the leaf area increases by 5-10%; and the harvest period is advanced by 3-6 days.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a suspension foliar fertilizer, characterized in that: The method comprises: (1) Preparation of zeolite powder: using natural clinoptilolite as raw material, grinding to obtain natural clinoptilolite powder; (2) zeolite activation: activating the natural clinoptilolite powder with a sodium chloride solution to obtain activated natural clinoptilolite powder; (3) Add the activated natural clinoptilolite powder to the conventional foliar fertilizer solution and mix well to obtain a suspension foliar fertilizer with a slow-release effect.

2. A method for preparing a suspension foliar fertilizer according to claim 1, characterized in that: In step (1), the natural clinoptilolite crystals used have a pore size range of 0.1 to 1.0 nanometers, a porosity of 20%, and a specific surface area of ​​25 m 2 / g; ion exchange capacity ≥1.2 mmol / g and adsorption capacity ≥0.1cm 3 / g.

3. A method for preparing a suspension foliar fertilizer according to claim 1, characterized in that: In step (1), the particle size of the natural clinoptilolite powder prepared satisfies: D99≦76 μm, D50≦36 μm.

4. A method for preparing a suspension foliar fertilizer according to claim 1, characterized in that: Step (2) specifically comprises: adding the natural clinoptilolite powder to a saturated sodium chloride solution for ion activation, and the immersion time is more than 24 hours; after the ion activation is completed, removing the sodium chloride solution, adding clean water to wash repeatedly until the sodium chloride concentration in the washing liquid is less than 3 mg / l, and naturally air-drying until the surface is free of water to obtain the activated natural clinoptilolite powder.

5. A method for preparing a suspension foliar fertilizer according to claim 1, characterized in that: In step (4), in the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.3-0.5%.

6. A suspension foliar fertilizer, characterized in that: The suspension foliar fertilizer comprises a conventional foliar fertilizer solution and activated natural clinoptilolite powder.

7. A suspension foliar fertilizer according to claim 6, characterized in that: In the suspension foliar fertilizer, the mass percentage concentration of the activated natural clinoptilolite powder is 0.3-0.5%.

8. A suspension foliar fertilizer according to claim 6, characterized in that: The conventional foliar fertilizer solution includes any one or more combinations of potassium dihydrogen phosphate solution, high nitrogen water-soluble fertilizer containing ammonium nitrogen, sugar alcohol calcium foliar fertilizer solution, calcium chloride foliar fertilizer solution, and trace element foliar fertilizer solution.

9. A suspension foliar fertilizer according to claim 6, characterized in that: The mass percentage concentration of potassium dihydrogen phosphate in the potassium dihydrogen phosphate solution is 0.1-0.3%; the mass percentage concentration of nitrogen fertilizer in the high-nitrogen water-soluble fertilizer containing ammonium nitrogen is 0.5-2.5%, the mass percentage concentration of calcium sugar alcohol in the calcium sugar alcohol or calcium chloride foliar fertilizer solution is 0.5-5.0%, the mass percentage concentration of calcium chloride in the calcium chloride foliar fertilizer solution is 0.5-5.0%, and the mass percentage concentration of trace elements in the trace element foliar fertilizer solution is 0.1-1.0%.

10. A suspension foliar fertilizer according to claim 6, characterized in that: The suspension foliar fertilizer is sprayed on the leaves of plants at a dosage of 200 to 400 liters per hectare.

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