A rice cultivation method based on oxygenation control irrigation

Abstract

The embodiment of the application provides a rice cultivation method based on oxygen increasing irrigation control, which comprises the following steps: laying multiple layers of oxygen increasing pipelines in a rice planting field, each layer of the oxygen increasing pipelines can control the oxygen release speed independently, and then sowing or transplanting rice in the field; detecting the oxygen concentration of the root zone of different soil layer depths in a time manner to obtain real-time root zone oxygen concentration data; determining a target oxygen concentration curve of the root zone in the current growth period according to the growth period of the rice; adjusting the oxygen release amount and duration of each layer of the oxygen increasing pipelines according to the deviation between the real-time detected root zone oxygen concentration and the target oxygen concentration curve, starting oxygen increasing when the root zone oxygen concentration is lower than the lower limit of the target value, and stopping oxygen increasing when the root zone oxygen concentration is higher than the upper limit of the target value; and performing oxygen dissolving treatment on irrigation water, and delivering the oxygen-rich water containing oxygen to the rice root zone through drip irrigation. The application adopts the method of laying oxygen increasing pipelines in layers, which is suitable for oxygen increasing in different growth periods of the rice, and the process is water-saving and consumption-reducing.

Description

Technical Field

[0001] This invention relates to the field of rice cultivation technology, and in particular to a rice cultivation method based on oxygen-enhanced controlled irrigation. Background Technology

[0002] Rice is a major food crop in my country, requiring a large amount of water for its growth, and is typically cultivated using flooded cultivation methods. However, prolonged flooding can lead to soil hypoxia, inhibiting root respiration and consequently affecting nutrient absorption and yield. To address this hypoxia problem in paddy fields, oxygen-enhancing irrigation is commonly used. This involves dissolving oxygen in the irrigation water or directly delivering oxygen to the root zone, improving the oxidative environment and promoting root development and nutrient absorption.

[0003] However, existing aeration irrigation methods suffer from imprecise aeration. Traditional aeration methods mostly involve uniform aeration across the entire field, failing to provide stratified aeration based on the root distribution depth at different growth stages of rice. The vertical distribution characteristics of rice roots differ at different growth stages; roots are concentrated at different soil depths during tillering, jointing, heading, and grain-filling stages. Uniform aeration across the entire field can lead to insufficient aeration in some soil layers and excessive aeration in others, resulting in low oxygen utilization. Furthermore, continuous aeration causes energy waste and high operating costs. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a rice cultivation method based on oxygen-enhanced controlled irrigation.

[0005] To solve the above-mentioned technical problems, the embodiments of the present invention adopt the following technical solution: a rice cultivation method based on oxygen-enhanced controlled irrigation, comprising the following steps:

[0006] S1. A multi-layer oxygenation pipeline is vertically laid in the soil profile of the rice planting field. The oxygenation pipeline is set at different depths from the ground surface. The oxygen release rate of each layer of the oxygenation pipeline can be controlled independently. After the pipeline is laid, rice is sown or transplanted in the field.

[0007] S2. Periodically detect the oxygen concentration in the root zone at different soil depths to obtain real-time oxygen concentration data in the root zone;

[0008] S3. Based on the growth stage of rice, determine the target oxygen concentration curve of the root zone during the current growth stage, and the target oxygen concentration curve is matched with the depth of the root active layer.

[0009] S4. Based on the deviation between the real-time detected root zone oxygen concentration and the target oxygen concentration curve, adjust the oxygen release amount and duration of each layer of oxygenation pipeline. Start oxygenation when the root zone oxygen concentration is lower than the lower limit of the target value, and stop oxygenation when the root zone oxygen concentration is higher than the upper limit of the target value.

[0010] S5. Dissolve oxygen in the irrigation water and regularly deliver oxygen-enriched water to the rice root zone via drip irrigation.

[0011] Furthermore, in step S1, the oxygenation pipeline is set at different depths of 10cm, 20cm, and 30cm.

[0012] Furthermore, in step S2, the step of periodically detecting the root zone oxygen concentration at different soil depths to obtain real-time root zone oxygen concentration data specifically includes:

[0013] S21. Install oxygen concentration sensors near the oxygenation pipelines on each floor, with the sensor probe buried at the same depth as the corresponding oxygenation pipeline.

[0014] S22, the oxygen concentration sensor has a measurement range of 0-20 mg / L;

[0015] S23. The sampling interval is one hour, and oxygen concentration data of each soil layer depth is automatically collected;

[0016] S24. Filter the collected oxygen concentration data to remove outliers and obtain real-time root zone oxygen concentration data.

[0017] Furthermore, in step S3, the rice growth period includes the tillering stage, jointing stage, heading stage, and grain-filling stage, and each growth stage corresponds to a different target oxygen concentration curve in the root zone.

[0018] Furthermore, in step S5, the dissolved oxygen treatment of the irrigation water specifically includes:

[0019] S51. Irrigation water is introduced into a dissolved oxygen device, wherein a microporous aerator is installed inside the dissolved oxygen device.

[0020] S52. Pure oxygen or oxygen-enriched air is introduced into the irrigation water through a microporous aerator, with the oxygen flow rate controlled at 0.5-2.0 L / min.

[0021] S53. Stir the water in the dissolved oxygen device, and control the stirring speed at 100-300 rpm.

[0022] S54. The single dissolved oxygen treatment time is 5-15 minutes to maintain the dissolved oxygen content of irrigation water at 8-12 mg / L;

[0023] S55. Monitor the dissolved oxygen content of irrigation water after oxygenation in real time, and stop aeration when it reaches the preset threshold.

[0024] Furthermore, the specific parameters for delivering oxygen-enriched water via drip irrigation are as follows: the drip irrigation tape spacing is 60-80cm, the dripper flow rate is 1.5-3.0L / h, the drip irrigation working pressure is controlled at 0.08-0.15MPa, the duration of each drip irrigation is controlled at 30-90 minutes, and the drip irrigation frequency is 2-3 days / time.

[0025] Furthermore, before vertically laying multi-layer aeration pipelines in the soil profile of the rice planting field, the tillage layer of the field is plowed, and the mixed base fertilizer is deeply applied into the tillage layer.

[0026] Furthermore, after the rice harvest is completed, the multi-layered oxygenation pipeline buried in the soil will be pulled out and recycled.

[0027] By adopting the above technical solution, the embodiments of the present invention have at least the following beneficial effects: The embodiments of the present invention lay multiple layers of oxygenation pipelines and periodically detect the oxygen concentration in the root zone at different soil depths. Based on the deviation between the real-time detection data and the target oxygen concentration curve, the oxygen release and duration of each layer of oxygenation pipelines are dynamically adjusted to keep the oxygen concentration in the root zone stable within a suitable range, thereby avoiding insufficient or excessive oxygenation and promoting root respiration and nutrient absorption in rice. Furthermore, the layered oxygenation of the oxygenation pipelines is combined with dissolved oxygen drip irrigation of irrigation water. While oxygenating, oxygen-enriched water is also delivered through drip irrigation, further supplementing the oxygen in the rice root zone and improving the oxygenation effect. There is no need for the traditional method of continuously delivering oxygen-enriched water through dissolved oxygen drip irrigation of irrigation water. The present invention can adjust the timing and amount of drip irrigation according to different growth stages of rice, reducing water consumption and lowering equipment operating costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of an optional embodiment of the rice cultivation method based on oxygen-enhanced controlled irrigation of the present invention;

[0030] Figure 2 This is a flowchart of step S2 of an optional embodiment of the rice cultivation method based on oxygen-enhanced controlled irrigation of the present invention;

[0031] Figure 3 This is a flowchart of step S5 of an optional embodiment of the rice cultivation method based on oxygen-enhanced controlled irrigation of the present invention. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present invention can be combined with each other unless otherwise specified.

[0033] like Figures 1-3 As shown, an optional embodiment of the present invention provides a rice cultivation method based on oxygen-enhanced controlled irrigation, comprising the following steps:

[0034] S1. A multi-layer oxygenation pipeline is vertically laid in the soil profile of the rice planting field. The oxygenation pipeline is set at different depths from the ground surface. The oxygen release rate of each layer of the oxygenation pipeline can be controlled independently. After the pipeline is laid, rice is sown or transplanted in the field.

[0035] S2. Periodically detect the oxygen concentration in the root zone at different soil depths to obtain real-time oxygen concentration data in the root zone;

[0036] S3. Based on the growth stage of rice, determine the target oxygen concentration curve of the root zone during the current growth stage, and the target oxygen concentration curve is matched with the depth of the root active layer.

[0037] S4. Based on the deviation between the real-time detected root zone oxygen concentration and the target oxygen concentration curve, adjust the oxygen release amount and duration of each layer of oxygenation pipeline. Start oxygenation when the root zone oxygen concentration is lower than the lower limit of the target value, and stop oxygenation when the root zone oxygen concentration is higher than the upper limit of the target value.

[0038] S5. Dissolve oxygen in the irrigation water and regularly deliver oxygen-enriched water to the rice root zone via drip irrigation.

[0039] This invention employs a multi-layered oxygenation pipeline system and periodically monitors the oxygen concentration in the root zone at different soil depths. Based on the deviation between real-time monitoring data and the target oxygen concentration curve, the oxygen release and duration of each layer of the oxygenation pipeline are dynamically adjusted to maintain a stable oxygen concentration in the root zone within a suitable range. This avoids insufficient or excessive oxygenation, promoting root respiration and nutrient absorption in rice. Furthermore, the layered oxygenation of the pipeline system is combined with dissolved oxygen drip irrigation. While providing oxygenation, oxygen-enriched water is also delivered via drip irrigation, further supplementing the oxygen supply to the rice root zone and enhancing the oxygenation effect. This eliminates the need for the continuous delivery of oxygen-enriched water using traditional dissolved oxygen drip irrigation. This invention allows for adjustments to the timing and amount of drip irrigation according to different growth stages of rice, reducing water consumption and lowering equipment operating costs.

[0040] In another embodiment of the invention, combined with Figure 1As shown, in step S1, the oxygenation pipelines are set at different depths of 10cm, 20cm, and 30cm. In this embodiment, the rice roots are mainly concentrated in the shallow soil layer of 0-10cm during the tillering stage, 0-20cm during the jointing stage, and 0-30cm during the heading and grain-filling stages. By setting up the above three layers of oxygenation pipelines, it can be ensured that the deep active roots can also obtain sufficient oxygen, avoiding insufficient nutrient absorption caused by hypoxia in the deep roots.

[0041] In another embodiment of the invention, combined with Figure 2 As shown, in step S2, the step of periodically detecting the root zone oxygen concentration at different soil depths to obtain real-time root zone oxygen concentration data specifically includes:

[0042] S21. Install oxygen concentration sensors near the oxygenation pipelines on each floor. The sensor probes should be buried at the same depth as the corresponding oxygenation pipelines, i.e., at depths of 10cm, 20cm, and 30cm respectively.

[0043] S22, the oxygen concentration sensor has a measurement range of 0-20 mg / L;

[0044] S23. The sampling interval is one hour, and oxygen concentration data of each soil layer depth is automatically collected;

[0045] S24. Filter the collected oxygen concentration data to remove outliers and obtain real-time root zone oxygen concentration data.

[0046] In this embodiment, by setting up corresponding sensors and filtering the collected data to remove outliers, the oxygen content of the root system of each coating can be accurately obtained, ensuring the stability of layered oxygenation.

[0047] In another embodiment of the invention, combined with Figure 1 As shown, in step S3, the rice growth stages include the tillering stage, jointing stage, heading stage, and grain-filling stage, each corresponding to a different target oxygen concentration curve in the root zone:

[0048] During the tillering stage: the target oxygen concentration in the 0-10cm soil layer is 5-7 mg / L, in the 10-20cm soil layer it is 4-6 mg / L, and in the 20-30cm soil layer it is 3-5 mg / L;

[0049] During the jointing stage: the target oxygen concentration in the 0-10cm soil layer is 6-8mg / L, in the 10-20cm soil layer it is 5-7mg / L, and in the 20-30cm soil layer it is 4-6mg / L;

[0050] During the heading stage: the target oxygen concentration in the 0-10cm soil layer is 7-9 mg / L, in the 10-20cm soil layer it is 6-8 mg / L, and in the 20-30cm soil layer it is 5-7 mg / L;

[0051] During the grouting period: the target oxygen concentration for the 0-10cm soil layer is 6-8mg / L, for the 10-20cm soil layer it is 5-7mg / L, and for the 20-30cm soil layer it is 4-6mg / L.

[0052] The target oxygen concentration curve is matched with the depth of the active root layer to ensure that the main root distribution layer can obtain sufficient oxygen supply.

[0053] In another embodiment of the invention, combined with Figure 3 As shown, in step S5, the dissolved oxygen treatment of the irrigation water specifically includes:

[0054] S51. Irrigation water is introduced into a dissolved oxygen device, wherein a microporous aerator is installed inside the dissolved oxygen device.

[0055] S52. Pure oxygen or oxygen-enriched air is introduced into the irrigation water through a microporous aerator, with the oxygen flow rate controlled at 0.5-2.0 L / min.

[0056] S53. Stir the water in the dissolved oxygen device, and control the stirring speed at 100-300 rpm.

[0057] S54. The single dissolved oxygen treatment time is 5-15 minutes to maintain the dissolved oxygen content of irrigation water at 8-12 mg / L;

[0058] S55. Monitor the dissolved oxygen content of irrigation water after oxygenation in real time, and stop aeration when it reaches the preset threshold (10mg / L).

[0059] In this embodiment, oxygen is dissolved through a microporous aerator, and the aeration flow rate, stirring speed and oxygenation time are controlled accordingly to further improve the oxygen dissolution efficiency in the water.

[0060] In practical applications, the irrigation volume and dissolved oxygen ratio of oxygen-enriched water can be dynamically adjusted according to the working status of the pipeline oxygenation system. After dissolved oxygen treatment, the irrigation water is delivered to the rice root zone via drip irrigation. This utilizes the pipeline oxygenation system to share the oxygen supply needs of the root zone, significantly reducing the water consumption for oxygen-enriched water drip irrigation. In this embodiment, the multi-layered oxygenation pipeline can supply oxygen to roots at different soil depths, prioritizing the replenishment of oxygen gaps in the deep root zone. This allows the oxygen-enriched water drip irrigation system to meet the limited oxygen and water supply needs of the shallow root system.

[0061] When all layers of oxygenation pipelines are running at full capacity, that is, when all depths of oxygenation pipelines are simultaneously opened and continuously release oxygen at the maximum rate, the overall oxygen supply capacity of the root zone in the field reaches its peak. At this time, the dissolved oxygen concentration of the oxygen-enriched water can be reduced to 50% to 70% of the conventional ratio, and the amount of water used for a single irrigation can be reduced by more than 30% simultaneously.

[0062] When some soil layer pipelines are intermittently started and stopped, only the pipelines in that local soil layer release oxygen intermittently, and the overall oxygen supply intensity is lower than the full-load operation state. In this case, the oxygen-enriched water parameters can be adjusted slightly. This combination mode changes the traditional method of relying on oxygen-enriched water for oxygen supply and water replenishment throughout the process. Under the premise of ensuring that the oxygen concentration in the root zone remains stable within the target range, it effectively reduces irrigation water consumption and water dissolved oxygen treatment costs.

[0063] In another embodiment of the invention, combined with Figure 1 As shown, the specific parameters for delivering oxygen-enriched water via drip irrigation are as follows: the drip tape spacing is 60-80cm, the dripper flow rate is 1.5-3.0L / h, the drip irrigation working pressure is controlled at 0.08-0.15MPa, the duration of each drip irrigation is determined according to soil moisture, and the frequency is controlled at 30-90 minutes, with a frequency of 2-3 days / time. In this embodiment, by setting the above parameters, it is possible to ensure that oxygen-enriched water is evenly delivered to all parts of the field. Combined with stratified oxygen supply, it can save water used for dissolved oxygen drip irrigation and reduce equipment operating costs.

[0064] In another embodiment of the invention, combined with Figure 1 As shown, before vertically laying multi-layer aeration pipelines in the soil profile of a rice paddy, the topsoil is tilled, and a mixed base fertilizer is deeply applied into the topsoil. In this embodiment, firstly, the topsoil is tilled to a depth of 25-30cm, and a mixed base fertilizer (2000kg / ha of organic fertilizer and 500kg / ha of compound fertilizer) is deeply applied into the topsoil. Trenches are dug to a depth of 35-40cm, with a spacing of 3-4m. Holes with a diameter of 4cm are drilled at 10cm, 20cm, and 30cm below the soil surface on the sidewalls of the trenches. The aeration pipelines (using PE flexible tubing with an outer diameter of 16mm) are inserted into the holes, and the pipelines are surrounded by breathable fillers (such as expanded clay or perlite) to ensure that oxygen can diffuse evenly into the soil. The soil is backfilled and compacted to ensure that the pipelines are fixed and leak-proof.

[0065] In another embodiment of the invention, combined with Figure 1 As shown, after step S5, once the rice harvest is complete, the multi-layered aeration pipeline buried in the soil is pulled out and retrieved. In this embodiment, the pipeline is buried inside the cultivated layer, with no protruding components on the surface, and the pipeline does not need to be moved during the entire rice harvesting process. This facilitates manual harvesting; the pipeline removal is arranged after harvesting to allow for subsequent tillage. This layout method is suitable for small-scale planting and manually managed farmland production.

[0066] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many variations under the guidance of the present invention without departing from the spirit and scope of the claims. These variations are all within the scope of protection of the present invention.

Claims

1. A rice cultivation method based on oxygen-enhanced controlled irrigation, characterized in that, The method includes the following steps: S1. A multi-layer oxygenation pipeline is vertically laid in the soil profile of the rice planting field. The oxygenation pipeline is set at different depths from the ground surface. The oxygen release rate of each layer of the oxygenation pipeline can be controlled independently. After the pipeline is laid, rice is sown or transplanted in the field. S2. Periodically detect the oxygen concentration in the root zone at different soil depths to obtain real-time oxygen concentration data in the root zone; S3. Based on the growth stage of rice, determine the target oxygen concentration curve of the root zone during the current growth stage, and the target oxygen concentration curve is matched with the depth of the root active layer. S4. Based on the deviation between the real-time detected root zone oxygen concentration and the target oxygen concentration curve, adjust the oxygen release amount and duration of each layer of oxygenation pipeline. Start oxygenation when the root zone oxygen concentration is lower than the lower limit of the target value, and stop oxygenation when the root zone oxygen concentration is higher than the upper limit of the target value. S5. Dissolve oxygen in the irrigation water and regularly deliver oxygen-enriched water to the rice root zone via drip irrigation.

2. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1, characterized in that, In step S1, the oxygenation pipeline is set at different depths of 10cm, 20cm, and 30cm.

3. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1 or 2, characterized in that, In step S2, the step of periodically detecting the root zone oxygen concentration at different soil depths to obtain real-time root zone oxygen concentration data specifically includes: S21. Install oxygen concentration sensors near the oxygenation pipelines on each floor, with the sensor probe buried at the same depth as the corresponding oxygenation pipeline. S22, the oxygen concentration sensor has a measurement range of 0-20 mg / L; S23. The sampling interval is one hour, and oxygen concentration data of each soil layer depth is automatically collected; S24. Filter the collected oxygen concentration data to remove outliers and obtain real-time root zone oxygen concentration data.

4. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1, characterized in that, In step S3, the rice growth period includes the tillering stage, jointing stage, heading stage, and grain-filling stage, and each growth stage corresponds to a different target oxygen concentration curve in the root zone.

5. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1, characterized in that, In step S5, the dissolved oxygen treatment of the irrigation water specifically includes: S51. Irrigation water is introduced into a dissolved oxygen device, wherein a microporous aerator is installed inside the dissolved oxygen device. S52. Pure oxygen or oxygen-enriched air is introduced into the irrigation water through a microporous aerator, with the oxygen flow rate controlled at 0.5-2.0 L / min. S53. Stir the water in the dissolved oxygen device, and control the stirring speed at 100-300 rpm. S54. The single dissolved oxygen treatment time is 5-15 minutes to maintain the dissolved oxygen content of irrigation water at 8-12 mg / L; S55. Monitor the dissolved oxygen content of irrigation water after oxygenation in real time, and stop aeration when it reaches the preset threshold.

6. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 5, characterized in that, The specific parameters for delivering oxygen-enriched water via drip irrigation are as follows: the drip tape spacing is 60-80cm, the dripper flow rate is 1.5-3.0L / h, the drip irrigation working pressure is controlled at 0.08-0.15MPa, the duration of each drip irrigation is controlled at 30-90 minutes, and the drip irrigation frequency is 2-3 days / time.

7. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1, characterized in that, Before laying multi-layered aeration pipelines vertically in the soil profile of the rice planting field, the tillage layer of the field is plowed and the mixed base fertilizer is deeply applied into the tillage layer.

8. The rice cultivation method based on oxygen-enhanced controlled irrigation according to claim 1, characterized in that, After step S5, once the rice harvest is complete, the multi-layered oxygenation pipeline buried in the soil is pulled out and recycled.

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