Method for reclaiming paddy field from sandy soil

Abstract

The invention discloses a method for reclaiming a paddy field from sandy soil, and relates to the technical field of soil reclamation, and the method comprises the following steps: arranging a sandy soil area of the paddy field to be reclaimed into a standard field surface; the method comprises the following steps: mixing bentonite, polyvinyl alcohol and talc in a weight ratio of (48-53): (1.6-2.3): (4-7) in an anhydrous manner, uniformly stirring to prepare an anti-seepage raw material, and uniformly spreading the uniformly mixed anti-seepage raw material on a field surface; the field surface where the anti-seepage raw materials are spread is stored and soaked for 45-50 days, and an anti-seepage plow pan is formed; after soaking is finished, the field is dried in the sun until the field surface is free of water and hard, and then the field surface is ground; covering 20-25cm of surface soil on the field surface, irrigating and stirring slurry to manufacture a plough layer, and completing paddy field reclamation after slurry stirring is finished. The method has the advantages that on the basis of reasonable configuration of various chemical raw materials, a sandy soil area is reclaimed into the paddy field by using a small amount of foreign soil, and the demand for the foreign soil is greatly reduced while lasting seepage prevention of the paddy field is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of soil reclamation, and in particular to a method for reclaiming paddy fields from sandy soil. Background Art

[0002] In some areas, sandy soils may be the predominant soil type. If left unused, these lands could become unused. Therefore, the most common practice is to reclaim sandy soils into paddy fields. This reclaiming of paddy fields allows sandy soils, which may not be suitable for growing dryland crops (such as wheat and corn), to be utilized, increasing arable land, improving land utilization, and ensuring food security.

[0003] The water retention capacity of paddy fields is an important factor affecting rice cultivation and its yield. Due to the poor water retention of sandy soil, it is difficult to reclaim paddy fields. At present, the reclamation of paddy fields in sandy soil usually adopts the method of covering with imported soil, but this method requires a large amount of imported soil, especially in sandy soil areas where the fine sand content accounts for more than 50%. Such areas have a higher sand content and require a large amount of imported soil to realize paddy field reclamation. However, for some areas dominated by sandy soil, imported soil basically needs to be transported in large quantities from other places. Not only is the reclamation construction period long and it is difficult to find soil sources, but the reclamation cost is high. Relying entirely on the imported soil covering is costly and takes a long time. In summary, the anti-seepage problem of sandy soil reclamation paddy fields is the key issue that determines whether sandy soil can be reclaimed into paddy fields. The current method of covering with imported soil is not only costly, but also difficult to solve the soil source problem.

[0004] Therefore, a new method for reclaiming paddy fields from sandy soil is needed, which can reduce the demand for imported soil and save costs while ensuring long-term anti-seepage of the paddy fields. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a method for reclaiming paddy fields from sandy soil, which greatly reduces the demand for imported soil while ensuring long-term anti-seepage of the paddy fields.

[0006] The present invention provides a method for reclaiming paddy fields from sandy soil, comprising the following steps: Prepare the sandy soil area to be reclaimed into paddy fields into a standard field surface; Bentonite, polyvinyl alcohol and talc in a weight ratio of (48-53): (1.6-2.3): (4-7) are mixed and stirred evenly to prepare an anti-seepage material, and the mixed anti-seepage material is evenly spread on the field surface; The field surface where the anti-seepage material has been spread is soaked in water for 45 to 50 days to form a plow bottom layer for anti-seepage effect; After soaking, dry the field until the surface is dry and hard, then roll the field surface; Cover the field surface with 20cm~25cm of topsoil, and irrigate and stir to make a tillage layer. After stirring, the paddy field reclamation is completed.

[0007] Preferably, every 100m 2 The anti-seepage raw materials in the field surface include 200 kg of bentonite, 8 kg of polyvinyl alcohol and 20 kg of talc.

[0008] Preferably, the steps of preparing the sandy soil area of ​​the paddy field to be reclaimed into a standard field surface include: Clearing sandy soil areas to be reclaimed for paddy fields; The field surface is flat, and the height difference is controlled within ±3cm; Use surveying instruments and steel rulers to lay out plots according to the design; Build ridges around the fields. After the ridges are formed, pat and compact the edges and cut the slopes according to the designed slope of the ridges. Carry out anti-seepage treatment on the ridges of fields.

[0009] Preferably, the ridge is 30 cm to 50 cm higher than the field, and the width of the ridge is 30 cm to 50 cm.

[0010] Preferably, the width of the field is 10m~20m, and the length of the field is 20m~30m.

[0011] Preferably, the anti-seepage treatment of the ridge comprises the following steps: Cover the ridge 20cm~25cm above the field surface with geotextiles; Cover the edge of the geotextile with soil for 10cm~25cm and compact it to fix it.

[0012] Preferably, the field surface where the anti-seepage material is spread is soaked in water for 48 days.

[0013] Preferably, when water is stored for soaking, the water depth in the field surface is 12cm~15cm.

[0014] Preferably, when water is stored for soaking, the water depth in the field surface is up to 14 cm.

[0015] Preferably, when making the tillage layer, if there is still 1cm~3cm of water in the field surface 3 to 5 days after the slurry is stirred, the paddy field reclamation is completed. If there is no water in the field surface 3 to 5 days after the slurry is stirred, it is necessary to cover the field surface with 5cm~10cm of topsoil again, irrigate and stir the slurry, and the paddy field reclamation is completed after the stirring is completed.

[0016] Compared with the prior art, the present invention discloses a method for reclaiming paddy fields from sandy soil, which has the following beneficial effects: This method rationally configures bentonite, polyvinyl alcohol and talc to make anti-seepage raw materials. By spreading the anti-seepage raw materials on the field surface and soaking them in water for a certain period of time, the anti-seepage raw materials seep down to form a plow bottom layer that can play an anti-seepage role. Then, a small amount of soil is covered on the surface of the plow bottom layer and stirred into a slurry to form a tillage layer, thereby realizing the reclamation of sandy soil into paddy fields. The anti-seepage treatment of this method is mainly based on the rational configuration and scientific application methods of multiple chemical raw materials, and a small amount of foreign soil is used to reclaim sandy soil areas into paddy fields. It not only greatly reduces the demand for foreign soil, saves reclamation costs and shortens reclamation period, but also solves the problem of long-term anti-seepage of paddy fields. In summary, this method can solve the problem of soil water conservation and anti-seepage in concentrated, contiguous and large-scale sandy soil areas, making up for the shortcomings of existing anti-seepage technologies and methods that are difficult to apply on a large scale and achieve long-term anti-seepage. At the same time, it also improves the regional ecological environment and reduces the actual and potential impact of wind and sand on the living environment and ecological environment of the surrounding areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0019] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the technical solution of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0022] Additionally, in the description of the present invention, "plurality" refers to two or more than two. The terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0023] Example 1 The embodiment of the present invention provides a method for reclaiming paddy fields from sandy soil. Figure 1 As shown, the following steps are included: Step 1: Determine the area for reclaiming paddy fields. Select the sandy soil area for reclaiming paddy fields. When selecting, first sample and measure the soil. Select the sandy soil area with a fine sand content of more than 50%. If the fine sand content is less than 50%, it means that the sand content in the soil area is low and the soil content is high. Considering the cost of anti-seepage materials and time, it is not necessary to perform the anti-seepage treatment in this embodiment. The existing covering soil of more than 35 cm can be used for anti-seepage. Then determine the area of ​​the sandy soil area. It is necessary to investigate whether the area is suitable for reclaiming paddy fields. At the same time, conduct an overall analysis of the terrain and perform topographic measurements.

[0024] Step 2: Prepare the field surface. Using engineering measures and in accordance with planning and design requirements, prepare the sandy soil area of ​​the paddy field to be reclaimed into a standard field surface. This is the field surface that can be directly planted with crops after the paddy field reclamation is completed.

[0025] Step 3: Spread the anti-seepage material. Mix bentonite, polyvinyl alcohol, and talc in a weight ratio of (48-53): (1.6-2.3): (4-7) without water and stir evenly to make the anti-seepage material. Spread the mixed anti-seepage material evenly on the field surface. The mixture of bentonite, polyvinyl alcohol, and talc can make the plow bottom layer compact and play a good anti-seepage role.

[0026] Step 4: Prepare the plow bottom layer. The field surface covered with the anti-seepage material is soaked in water for a preset period of time. During the soaking process, the anti-seepage material seeps down, forming a plow bottom layer that can play an anti-seepage role.

[0027] Step 5: Sun-drying the fields. After soaking, sun-dry the fields until the surface is dry and hard. Then, roll the fields to form a plow bottom layer that is compacted. Use a roller to compact the fields to create a stable soil structure that retains water and fertilizer. Rolling creates a stable soil structure, which enhances the soil's bearing capacity, erosion resistance, and anti-seepage capabilities.

[0028] Step 6: Cover the field with soil and stir. Cover the field with 20cm~25cm of topsoil. The topsoil can be black soil or other common soil. Water is poured into the soil and stirred to create a plough layer. After stirring, the paddy field is reclaimed and crops such as rice can be planted in the field.

[0029] According to the above steps, this method can solve the problem of soil water conservation and anti-seepage in concentrated, contiguous and large-scale sandy soil areas, and make up for the shortcomings of existing anti-seepage technical methods that are difficult to apply on a large scale and achieve long-term anti-seepage. The anti-seepage treatment of this method is mainly based on the reasonable configuration and scientific application methods of multiple chemical raw materials, and uses a small amount of imported soil to reclaim sandy soil areas into paddy fields. It not only greatly reduces the demand for imported soil, saves reclamation costs and shortens reclamation period, but also solves the problem of long-term anti-seepage of paddy fields. At the same time, in addition to solving the anti-seepage problem and land use problem of reclaiming paddy fields in sandy soil areas, this method also improves the regional ecological environment and reduces the actual and potential impact of wind and sand on the living environment and ecological environment of surrounding areas.

[0030] Furthermore, in the above step 3, the three chemical materials can achieve good anti-seepage effect after mixing at any value within the mixing ratio range. However, in order to achieve the dual goals of saving chemical materials and the best anti-seepage effect, further experiments were conducted to obtain the optimal mixing ratio, that is, bentonite, polyvinyl alcohol and talc are mixed in an anhydrous ratio of 50:2:5 to obtain the best anti-seepage effect. At the same time, multiple tests were conducted according to the optimal mixing ratio and it was found that per 100m 2 The anti-seepage materials in the field surface include 200kg of bentonite, 8kg of polyvinyl alcohol and 20kg of talc. 2 The best anti-seepage effect can be achieved by spreading the three mixtures in the above dosage on the field surface. 2 It is unnecessary to add more anti-seepage materials in the field surface, which will only cause waste of anti-seepage materials. If it is less, the final anti-seepage effect required cannot be achieved. In order to determine the mixing ratio of the above three chemical raw materials and the 2 The optimal mixing ratio (50:2:5) and the amount of anti-seepage raw materials used in fields were obtained through laboratory tests and field experiments.

[0031] Specific field experiment: By constructing a 1000m 2The three chemical materials were mixed in different amounts at a ratio of 50:2:5 in a square plot according to the area of ​​the test plot. The following are the anti-seepage test data of four of the mixing schemes: Experimental procedure: First, the three chemical materials from "Scheme 1" were evenly distributed throughout the waterless test plot, followed by irrigation to a depth of 12 cm. After 12 hours, all water had seeped through the field. Second, the difference between "Scheme 1" and "Scheme 2" was added to the waterless test plot, followed by irrigation to a depth of 12 cm. After 24 hours, approximately 10 cm of water had seeped through the field. Third, the difference between "Scheme 2" and "Scheme 3" was added to the waterless test plot, followed by irrigation to a depth of 12 cm. After 24 hours, approximately 4 cm of water had seeped through the field. Finally, the difference between "Scheme 3" and "Scheme 4" was added to the waterless test plot, followed by irrigation to a depth of 12 cm. After 24 hours, approximately 2 cm of water had seeped through the field. The results of the field water storage experiments on the four schemes mentioned above show that the mixing ratio of the three chemical materials in "Scheme 4" has a good water storage effect on sandy soil and can meet the actual requirements of paddy field water storage.

[0032] Furthermore, in the above step six, when making the tillage layer, if there is still 1cm~3cm of water in the field surface after 3~5 days, it means that the water has not seeped too much, the anti-seepage measures are successful, and the paddy field reclamation is completed. If there is no water in the field surface after 3~5 days, it means that there are still some pores around the field surface and the plow bottom layer that affect the anti-seepage effect. At this time, it is necessary to cover the field surface with 5cm~10cm of topsoil again, and irrigate and stir the slurry. After the stirring is completed, the paddy field reclamation is completed. When stirring, the mud seepage will block the pores around the field surface and the plow bottom layer, thereby achieving the required anti-seepage effect. At the same time, there is no need to observe whether water seeps out within 3~5 days after stirring, because after two times of covering and stirring, the covering soil thickness reaches 25cm~35cm, and coupled with the anti-seepage effect of the mixture, the anti-seepage effect can meet the required requirements after the second covering.

[0033] Example 2 As a further improvement on Example 1, in step 2 of Example 1, arranging the sandy soil area of ​​the paddy field to be reclaimed into a standard field surface includes the following steps: Step 1: Clear away tree roots, gravel, grass and other debris from the sandy soil area to be reclaimed into paddy fields; Step 2: Level the field surface, controlling the height difference within ±3cm, so that the sandy soil area of ​​the paddy field to be reclaimed is all on a relatively flat plane, which is convenient for planting rice and other crops after the paddy field reclamation is completed; Step 3: Use measuring instruments and steel rulers to lay out the fields according to the design, and use gravity irrigation to lay out the fields. The width of the fields should be no less than 10 meters and the length should be no less than 20 meters. Step 4: Build ridges around the fields. The ridges should be 30cm~50cm higher than the fields and 30cm~50cm wide. After the ridges are formed, pat and compact the edges and cut the slopes according to the designed slope of the ridges. Step 5: Carry out anti-seepage treatment on the ridges.

[0034] Furthermore, when carrying out anti-seepage treatment on the ridge, geotextile is covered on the ridge 20cm~25cm above the field surface, and then covered with 10cm~25cm of foreign soil and compacted. When laying the geotextile, the laying width on the ridge should not be less than 50% of the width of the field surface, and extend below the cultivated layer at the bottom of the ridge to a depth of generally 25cm~30cm, and the edges of the geotextile are covered with soil to fix. By covering the ridge with geotextile, the ridge can be treated for anti-seepage, so that both the field surface and the ridge have better anti-seepage effect, preventing water from leaking out.

[0035] Among them, the other structures of this embodiment are consistent with those of Example 1, and are just optimizations made to Example 1.

[0036] Example 3 As a further improvement scheme based on Example 1, further, in step 4 of Example 1, the field surface where the anti-seepage material is spread is soaked in water for 45 to 50 days. Experiments have shown that the best time is 48 days. If the soaking time is less than 45 days, the soaking time is too short, which may cause the anti-seepage material to infiltrate insufficiently, affecting the formation of the plow bottom layer and resulting in poor anti-seepage effect in the later stage. If the soaking time is more than 50 days, it is unnecessary because the anti-seepage material has infiltrated sufficiently and the soaking is sufficient. Continuing to soak will only waste water resource costs. In summary, the best time for water storage and soaking is 45 to 50 days.

[0037] Furthermore, when storing water for soaking, the water storage depth in the field is 12cm~15cm. Experiments have shown that the best is 14cm. If the water storage depth is less than 12cm, in hot weather and during the early soaking process, evaporation and water seepage will occur, resulting in less water in the field, and repeated irrigation will be required, wasting manpower. If the water storage depth is greater than 15cm, the water storage is too much and unnecessary, which will lead to waste of water resources and increase the time for drying the fields later, reducing reclamation efficiency. In summary, when storing water for soaking, the water storage depth is best within 12cm~15cm.

[0038] Among them, the other structures of this embodiment are consistent with those of Example 1, and are just optimizations made to Example 1.

[0039] The advantage of the present invention is that this method rationally configures bentonite, polyvinyl alcohol and talc to make anti-seepage raw materials, and by spreading the anti-seepage raw materials on the field surface and soaking them in water for a certain period of time, the anti-seepage raw materials seep down to form a plow bottom layer that can play an anti-seepage role, and then a small amount of soil is covered on the surface of the plow bottom layer and stirred into a slurry to form a tillage layer, thereby realizing the reclamation of sandy soil into paddy fields. The anti-seepage treatment of this method is mainly based on the rational configuration and scientific application methods of multiple chemical raw materials, and a small amount of foreign soil is used to reclaim sandy soil areas into paddy fields, which not only greatly reduces the demand for foreign soil, saves reclamation costs and shortens the reclamation period, but also solves the problem of long-term anti-seepage of paddy fields. In summary, this method can solve the problem of soil water conservation and anti-seepage in concentrated, contiguous and large-scale sandy soil areas, making up for the shortcomings of existing anti-seepage technologies that are difficult to apply on a large scale and achieve long-term anti-seepage, while also improving the regional ecological environment and reducing the actual and potential impact of wind and sand on the living environment and ecological environment of the surrounding areas.

[0040] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A method for reclaiming paddy fields from sandy soil, characterized in that: The following steps are involved: Prepare the sandy soil area to be reclaimed into paddy fields into a standard field surface; Bentonite, polyvinyl alcohol and talc in a weight ratio of (48-53): (1.6-2.3): (4-7) are mixed and stirred evenly to prepare an anti-seepage material, and the mixed anti-seepage material is evenly spread on the field surface; The field surface where the anti-seepage material has been spread is soaked in water for 45 to 50 days to form a plow bottom layer for anti-seepage; After soaking, dry the field until the surface is dry and hard, then roll the field surface; Cover the field surface with 20cm~25cm of topsoil, and irrigate and stir to make a tillage layer. After stirring, the paddy field reclamation is completed.

2. The method for reclaiming paddy fields from sandy soil according to claim 1, wherein: Every 100m 2 The anti-seepage raw materials in the field surface include 200 kg of bentonite, 8 kg of polyvinyl alcohol and 20 kg of talc.

3. The method for reclaiming paddy fields from sandy soil according to claim 1, wherein: The following steps are involved in preparing the sandy soil area to be reclaimed into paddy fields into a standard field surface: Clearing sandy soil areas to be reclaimed for paddy fields; The field surface is flat, and the height difference is controlled within ±3cm; Use surveying instruments and steel rulers to lay out plots according to the design; Build ridges around the fields. After the ridges are formed, pat and compact the edges and cut the slopes according to the designed slope of the ridges. Carry out anti-seepage treatment on the ridges of fields.

4. The method for reclaiming paddy fields from sandy soil according to claim 3, wherein: The ridge is 30cm to 50cm higher than the field, and the width of the ridge is 30cm to 50cm.

5. The method for reclaiming paddy fields from sandy soil according to claim 3, characterized in that: The width of the field is 10m~20m, and the length of the field is 20m~30m.

6. The method for reclaiming paddy fields from sandy soil according to claim 3, characterized in that: The anti-seepage treatment of field ridges includes the following steps: Cover the ridge 20cm~25cm above the field surface with geotextiles; Cover the edge of the geotextile with soil for 10cm~25cm and compact it to fix it.

7. The method for reclaiming paddy fields from sandy soil according to claim 1, characterized in that: The field surface covered with the anti-seepage material is soaked in water for 48 days.

8. The method for reclaiming paddy fields from sandy soil according to claim 1, characterized in that: When water is stored and soaked, the water depth in the field is 12cm~15cm.

9. The method for reclaiming paddy fields from sandy soil according to claim 8, characterized in that: When the water is stored and soaked, the water depth in the field can reach 14cm.

10. The method for reclaiming paddy fields from sandy soil according to claim 1, characterized in that: When making the tillage layer, if there is still 1cm~3cm of water on the field surface 3~5 days after the slurry is stirred, the paddy field reclamation is completed. If there is no water on the field surface 3~5 days after the slurry is stirred, it is necessary to cover the field surface with 5cm~10cm of topsoil again, irrigate and stir the slurry, and the paddy field reclamation is completed after the stirring is completed.

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