A soil conditioner made from oyster shells suitable for sugarcane planting and a preparation method thereof

Abstract

The invention relates to the technical field of soil conditioners, and provides an oyster shell soil conditioner suitable for sugarcane planting and a preparation method thereof, so as to solve the defects of the soil conditioner in the prior art that it is unfavorable to the growth of plants and is easy to cause soil compaction after long-term use. The invention comprises the following preparation steps: (1) preparing oyster shell powder; (2) adding auxiliary materials: adding organic biological fermentation concentrate to the oyster shell powder, wherein the amount of the organic biological fermentation concentrate is 40%-120% of the weight of the oyster shell powder; (3) mixing uniformly: mixing the oyster shell powder and the auxiliary materials and stirring uniformly; (4) granulating: feeding the oyster shell powder into a granulator for granulation to obtain primary granules; (5) drying treatment; and (6) wrapping tea stalk powder.

Description

Technical Field

[0001] The invention relates to the technical field of soil conditioners, and in particular to a soil conditioner made from oyster shells suitable for sugarcane planting and a preparation method thereof. Background Art

[0002] When planting sugarcane, suitable soil is needed. Overly acidic or alkaline soil will affect the growth quality of sugarcane. The suitable soil pH value for sugarcane growth and development is 5.5-7.5. Long-term planting of sugarcane in the soil and the use of various fertilizers and pesticides will lead to deterioration of soil physical and chemical properties, soil acidification and compaction, nutrient imbalance, and poor ability to resist disasters. The activity of soil microorganisms decreases after acidification, and the bacterial community also changes accordingly, affecting the normal growth of sugarcane, resulting in a decrease in sugarcane yield and quality.

[0003] In order to improve the soil quality for growing sugarcane, soil conditioners are often used in the prior art. Common soil conditioners are generally mineral soil conditioners, which generally contain minerals such as calcium, magnesium, silicon, and phosphorus. They can effectively increase the mineral nutrients in the soil and improve the physical, chemical, and biological properties of the soil.

[0004] Chinese patent application No. 201610986367.4 discloses a method for preparing a silicic acid soil conditioner using tailings powder, which is carried out according to the following steps: (1) crushing the tailings powder, bentonite and alkali metal hydroxide to less than 200 mesh; (2) mixing the tailings powder and bentonite at a mass ratio of 1:(1-1.5); thoroughly mixing the mixture with alkali metal hydroxide at a mass ratio of 1:(0.3-0.5); adding an activator, wherein the amount of the activator added is 0.25-0.3 times the mass of the alkali metal hydroxide added; stirring and mixing the above-mentioned mixture with water at a mass ratio of 1:(1.2-1.5); (3) subjecting the mixture to a hydrothermal reaction at a temperature of 180-220°C in a closed reactor for a reaction time of 5-7 hours; (4) drying, crushing, sieving and granulating the reactants to obtain a silicon-rich acidic soil conditioner. The soil conditioner can recycle the tailings powder, which not only solves the environmental pollution caused by the extensive treatment of tailings powder, but also saves resources. This type of soil conditioner can improve the pH value of the soil in the short term, but if used for a long time, it is easy to make the air permeability of the soil worse, affect the respiration of plant roots, and easily cause hardening. In addition, the tailings powder may contain heavy metals. The accumulation of these heavy metals in the soil will affect the growth of plants and enter the human body through the food chain, posing a threat to human health. Summary of the invention

[0005] Therefore, in view of the above problems, the present invention provides a soil conditioner made of oyster shells suitable for sugarcane planting and a preparation method thereof, so as to solve the defects of the soil conditioners in the prior art that they are not conducive to the growth of plants and easily cause the soil to become compacted after long-term use.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a method for preparing an oyster shell soil conditioner suitable for sugarcane planting, comprising the following preparation steps:

[0007] (1) Preparation of oyster shell powder: collecting, washing, drying, and crushing oyster shells, and sieving through a 300-mesh to 500-mesh sieve to obtain oyster shell powder; then calcining, grinding, and sieving the oyster shell powder to obtain oyster shell powder with a particle size of 5 μm to 10 μm;

[0008] (2) Adding auxiliary materials: adding organic biological fermentation concentrate to the oyster shell powder, wherein the amount of the organic biological fermentation concentrate is 40%-120% of the weight of the oyster shell powder;

[0009] (3) Mixing evenly: mixing the oyster shell powder and the auxiliary materials and stirring evenly;

[0010] (4) Granulation: Send the material to the granulator for granulation to obtain primary granules;

[0011] (5) Drying treatment;

[0012] (6) Coating tea stem powder: spraying a bio-based adhesive on the surface of the primary particles after drying, and then sprinkle the tea stem powder into the particles, and mix them thoroughly to obtain a granular soil conditioner.

[0013] Furthermore: the tea stem powder is obtained by crushing the tea stems to a particle size of 1 μm-100 μm.

[0014] Furthermore: the particle size of the primary particles is 5mm-15mm.

[0015] Further: the bio-based adhesive is cassava flour glue.

[0016] Further: the specific process of step (1) cleaning is: using a cleaning device to clean the oyster shells, the cleaning device includes a cylinder for containing the oyster shells, the cylinder is provided with a stirring brush, the stirring brush includes a brush head and a brush rod connected to the brush head, the other end of the brush rod is connected to a driving device, and the brush rod can drive the brush head to rotate by starting the driving device;

[0017] First, the oyster shells are sent to a cleaning device for cleaning. Light salt water is pre-added in the cleaning device. The oyster shells are soaked in the light salt water for 1 hour to 2 hours to make the mud and sand on the surface of the oyster shells fall off. The light salt water containing mud and sand is drained, and then clean water is added. The driving device is started to make the brush head run to brush the oyster shells for 2 hours to 3 hours. The water is drained and the oyster shells are rinsed with clean water to complete the cleaning of the oyster shells.

[0018] Furthermore: the specific process of crushing in step (1) is: sending the dried oyster shells into a coarse crusher for preliminary crushing, and then sending them into a fine crusher for secondary crushing.

[0019] Furthermore, the preparation process of the organic biological fermentation thick material is as follows: a. preparing raw materials: 100 parts by weight of molasses, 20-50 parts by weight of soybean meal, 1000-2000 parts by weight of water and 2-5 parts by weight of yeast; b. mixing the raw materials, stirring evenly, and fermenting for 10-30 days, stirring once to three times a day during the fermentation process; c. filtering out impurities and solid particles, and taking the fermentation liquid, which is the organic biological fermentation thick material.

[0020] An oyster shell soil conditioner suitable for sugarcane planting comprises the following raw materials in parts by weight: 100 parts of oyster shell powder, 40-120 parts of organic biological fermentation thick material, 10-25 parts of bio-based adhesive and 40-80 parts of tea stem powder. The organic biological fermentation thick material comprises the following raw materials in parts by weight: 100 parts by weight of molasses, 20-50 parts by weight of soybean meal, 1000-2000 parts by weight of water and 2-5 parts by weight of yeast.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are:

[0022] The oyster shell soil conditioner suitable for sugarcane planting of the present invention uses oyster shell powder and organic biological fermentation thick material as main raw materials, and recycles oyster shells, which not only solves the problem of environmental pollution caused by oyster shell accumulation, but also realizes resource recycling; the organic biological fermentation thick material is used as a raw material, and the organic biological fermentation thick material uses molasses, soybean meal, and yeast as raw materials. These raw materials are rich in minerals, amino acids, vitamins and beneficial microorganisms. When the raw materials are combined with oyster shell powder, they can be absorbed by the dense pores on the surface of the oyster shell powder. When applied to the soil, they can contact with the soil, improve soil quality, provide nutrients for sugarcane growth, promote the healthy growth of sugarcane, and improve the quality of sugarcane.

[0023] The raw materials used in the soil conditioner of the present invention are relatively environmentally friendly. After being applied to the soil and used for a long time, it will not cause soil compaction and can also improve the quality of the soil.

[0024] The soil conditioner of the present invention adopts oyster shell powder as the main raw material. After the oyster shell powder is processed, the outermost layer is tea stalk powder and the inner layer is primary particles. The two are bonded by a bio-based adhesive. The tea stalk powder on the outermost layer contacts the soil first. The tea stalk powder is rich in nitrogen, phosphorus and potassium fertilizers required for the growth of sugarcane, and can promote the growth and development of sugarcane. The addition of tea stalk powder can improve the air permeability of the soil, make the soil looser, and is beneficial to the respiration and growth of the sugarcane root system. In addition, the tea stalk contains a small amount of antibacterial substances, which can reduce the occurrence of sugarcane diseases and insect pests to a certain extent.

[0025] The soil conditioner of the present invention is a granular material, which is convenient for storage and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a soil conditioner in Example 1 of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the cleaning device in the first embodiment of the present invention. DETAILED DESCRIPTION

[0028] Embodiment 1

[0029] refer to Figure 1 and Figure 2 , an oyster shell soil conditioner suitable for sugarcane planting, comprising the following raw materials in parts by weight: 100 parts of oyster shell powder, 40 parts of organic biological fermentation thick material, 10 parts of bio-based adhesive and 40 parts of tea stem powder, wherein the organic biological fermentation thick material comprises the following raw materials in parts by weight: 100 parts by weight of molasses, 20 parts by weight of soybean meal, 1000 parts by weight of water and 2 parts by weight of yeast. The bio-based adhesive is cassava flour glue.

[0030] The above-mentioned method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting comprises the following preparation steps:

[0031] Preparation of oyster shell powder: collecting, washing, drying, crushing oyster shells, and passing through a 300-mesh sieve to obtain oyster shell powder; then calcining, grinding and sieving the oyster shell powder to obtain oyster shell powder with a particle size of 5 μm;

[0032] The specific cleaning process is: use a cleaning device to clean the oyster shells, refer to Figure 2 The cleaning device includes a cylinder 4 for holding oyster shells, and a stirring brush is arranged in the cylinder 4. The stirring brush includes a brush head 51 and a brush rod 52 connected to the brush head. The other end of the brush rod is connected to a driving device 6. By starting the driving device 6, the brush rod 52 can drive the brush head 51 to rotate;

[0033] First, the oyster shells are sent to a cleaning device for cleaning. The cleaning device is pre-filled with light salt water. The oyster shells are soaked in the light salt water for 1 hour to make the mud and sand on the surface of the oyster shells fall off, the light salt water containing mud and sand is drained, and then clean water is added. The driving device is started to make the brush head run to brush the oyster shells for 2 hours, the water is drained, and the oyster shells are rinsed with clean water to complete the cleaning of the oyster shells;

[0034] The specific process of crushing is as follows: the dried oyster shells are sent to a coarse crusher for preliminary crushing, and then sent to a fine crusher for secondary crushing;

[0035] Adding auxiliary materials: adding organic biological fermentation concentrate to the oyster shell powder, wherein the amount of the organic biological fermentation concentrate is 40% of the weight of the oyster shell powder;

[0036] The preparation process of the organic biological fermentation thick material is as follows: a. preparing raw materials: 100 parts by weight of molasses, 20 parts by weight of soybean meal, 1000 parts by weight of water and 2 parts by weight of yeast; b. mixing the raw materials, stirring evenly, and fermenting for 10 days, stirring once a day during the fermentation process; c. filtering out impurities and solid particles, and taking the fermentation liquid, which is the organic biological fermentation thick material;

[0037] (3) Mixing evenly: mixing the oyster shell powder and the auxiliary materials and stirring evenly;

[0038] (4) Granulation: Send the material to the granulator for granulation to obtain primary granules;

[0039] (5) Drying treatment;

[0040] (6) Coating tea stem powder: spray cassava flour glue on the surface of the primary particles after drying, then sprinkle tea stem powder, mix well and evenly, to obtain a granular soil conditioner.

[0041] The tea stem powder is obtained by crushing the tea stems to a particle size of 1 μm, and the particle size of the primary particles is 5 mm.

[0042] refer to Figure 1 The soil conditioner of this embodiment has an outermost layer of tea stem powder 1, an inner layer of primary particles 2, and cassava powder glue 3 between the two.

[0043] Embodiment 2

[0044] An oyster shell soil conditioner suitable for sugarcane planting comprises the following raw materials in parts by weight: 100 parts of oyster shell powder, 80 parts of organic biological fermentation thick material, 15 parts of cassava flour glue and 60 parts of tea stem powder. The organic biological fermentation thick material comprises the following raw materials in parts by weight: 100 parts by weight of molasses, 35 parts by weight of soybean meal, 1500 parts by weight of water and 4 parts by weight of yeast.

[0045] The above-mentioned method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting comprises the following preparation steps:

[0046] (1) Preparation of oyster shell powder: collecting, washing, drying, and crushing oyster shells, and passing through a 400-mesh sieve to obtain oyster shell powder; then calcining, grinding, and sieving the oyster shell powder to obtain oyster shell powder with a particle size of 7 μm;

[0047] (2) Adding auxiliary materials: adding organic biological fermentation thick material to the oyster shell powder, wherein the amount of the organic biological fermentation thick material is 80% of the weight of the oyster shell powder; the preparation process of the organic biological fermentation thick material is as follows: a. preparing raw materials: 100 parts by weight of molasses, 35 parts by weight of soybean meal, 1500 parts by weight of water and 4 parts by weight of yeast; b. mixing the raw materials, stirring evenly, and fermenting for 20 days, stirring twice a day during the fermentation process; c. filtering out impurities and solid particles, and taking the fermentation liquid, which is the organic biological fermentation thick material;

[0048] (3) Mixing evenly: mixing the oyster shell powder and the auxiliary materials and stirring evenly;

[0049] (4) Granulation: Send the material to the granulator for granulation to obtain primary granules;

[0050] (5) Drying treatment;

[0051] (6) Coating tea stem powder: spray cassava flour glue on the surface of the primary particles after drying, then sprinkle tea stem powder, mix well and evenly, to obtain a granular soil conditioner.

[0052] The tea stem powder is obtained by crushing the tea stems to a particle size of 50 μm, and the particle size of the primary particles is 10 mm.

[0053] The specific process of cleaning and crushing in step (1) is the same as that in Example 1.

[0054] Embodiment 3

[0055] An oyster shell soil conditioner suitable for sugarcane planting comprises the following raw materials in parts by weight: 100 parts of oyster shell powder, 120 parts of organic biological fermentation concentrate, 25 parts of bio-based adhesive, and 80 parts of tea stem powder. The organic biological fermentation concentrate comprises the following raw materials in parts by weight: 100 parts by weight of molasses, 50 parts by weight of soybean meal, 2000 parts by weight of water, and 5 parts by weight of yeast.

[0056] The above-mentioned method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting comprises the following preparation steps:

[0057] (1) Preparation of oyster shell powder: collecting, washing, drying, and crushing oyster shells, and passing through a 500-mesh sieve to obtain oyster shell powder; then calcining, grinding, and sieving the oyster shell powder to obtain oyster shell powder with a particle size of 10 μm;

[0058] (2) Adding auxiliary materials: adding organic biological fermentation thick material to the oyster shell powder, wherein the amount of the organic biological fermentation thick material is 120% of the weight of the oyster shell powder; the preparation process of the organic biological fermentation thick material is as follows: a. preparing raw materials: 100 parts by weight of molasses, 50 parts by weight of soybean meal, 2000 parts by weight of water and 5 parts by weight of yeast; b. mixing the raw materials, stirring evenly, and fermenting for 30 days, stirring 3 times a day during the fermentation process; c. filtering out impurities and solid particles, and taking the fermentation liquid, which is the organic biological fermentation thick material;

[0059] (3) Mixing evenly: mixing the oyster shell powder and the auxiliary materials and stirring evenly;

[0060] (4) Granulation: Send the material to the granulator for granulation to obtain primary granules;

[0061] (5) Drying treatment;

[0062] (6) Coating tea stem powder: spraying a bio-based adhesive on the surface of the primary particles after drying, and then sprinkle the tea stem powder into the particles, and mix them thoroughly to obtain a granular soil conditioner.

[0063] The tea stem powder is obtained by crushing tea stems to a particle size of 100 μm, and the particle size of the primary particles is 15 mm.

[0064] The specific process of cleaning and crushing in step (1) is the same as that in Example 1.

[0065] Comparative Example 1

[0066] Use cow dung as soil conditioner.

[0067] The soil conditioners of Examples 1 to 3 of the present invention and the cow dung soil conditioner of Comparative Example 1 were used to condition an acidic soil with a pH of about 5. After 6 months, the test was conducted. The results are as follows:

[0068] Embodiment 1 Embodiment 2 Embodiment 3 Comparative Example 1 Soil pH 5.8 5.9 6.0 5.2

[0069] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting, characterized in that: The method comprises the following preparation steps: (1) Preparation of oyster shell powder: collecting, washing, drying and crushing oyster shells, and passing through a 300-500 mesh sieve to obtain oyster shell powder; then calcining, grinding and sieving the oyster shell powder to obtain oyster shell powder with a particle size of 5 μm to 10 μm; (2) Adding auxiliary materials: adding organic biological fermentation concentrate to the oyster shell powder, wherein the amount of the organic biological fermentation concentrate is 40%-120% of the weight of the oyster shell powder; (3) Mixing evenly: mixing the oyster shell powder and the auxiliary materials and stirring evenly; (4) Granulation: Send the material to the granulator for granulation to obtain primary granules; (5) Drying treatment; (6) Coating tea stem powder: spraying a bio-based adhesive on the surface of the primary particles after drying, and then sprinkling the tea stem powder, and mixing them thoroughly to obtain a granular soil conditioner; The tea stem powder is obtained by crushing tea stems to a particle size of 1 μm-100 μm; the particle size of the primary particles is 5 mm-15 mm; The bio-based adhesive is cassava flour glue; The preparation process of the organic biological fermentation thick material is as follows: a. preparing raw materials: 100 parts by weight of molasses, 20-50 parts by weight of soybean meal, 1000-2000 parts by weight of water and 2-5 parts by weight of yeast; b. mixing the raw materials, stirring evenly, and fermenting for 10-30 days, stirring once to three times a day during the fermentation process; c. filtering out impurities and solid particles, and taking the fermentation liquid, which is the organic biological fermentation thick material; The granular soil conditioner comprises the following raw materials in parts by weight: 100 parts of oyster shell powder, 40-120 parts of organic biological fermentation concentrate, 10-25 parts of bio-based adhesive and 40-80 parts of tea stem powder; the organic biological fermentation concentrate comprises the following raw materials in parts by weight: 100 parts by weight of molasses, 20-50 parts by weight of soybean meal, 1000-2000 parts by weight of water and 2-5 parts by weight of yeast.

2. The method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting according to claim 1, characterized in that: The specific process of step (1) cleaning is as follows: using a cleaning device to clean the oyster shells, the cleaning device includes a cylinder for containing the oyster shells, the cylinder is provided with a stirring brush, the stirring brush includes a brush head and a brush rod connected to the brush head, the other end of the brush rod is connected to a driving device, and the brush rod can drive the brush head to rotate by starting the driving device; first, the oyster shells are sent to the cleaning device for cleaning, the cleaning device is pre-filled with light salt water, the oyster shells are soaked in the light salt water for 1h-2h, the mud and sand on the surface of the oyster shells are dropped, the light salt water containing mud and sand is drained, and then clean water is added, the driving device is started, the brush head is operated to brush the oyster shells for 2h-3h, the water is drained and the oyster shells are rinsed with clean water, and the cleaning of the oyster shells is completed.

3. The method for preparing a soil conditioner made from oyster shells suitable for sugarcane planting according to claim 1, characterized in that: The specific process of the crushing in step (1) is as follows: the dried oyster shells are sent to a coarse crusher for preliminary crushing, and then sent to a fine crusher for secondary crushing.

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