37 results about "Paddy soils" patented technology

The invention relates to the field of soil nutrient management, in particular to a rice soil nutrient coordinated regulation and control method and system based on big data analysis, and the method comprises the steps: firstly, collecting data through a multi-source sensing array, and constructing a feature state space with time sequence memory; a physical field theory is introduced, and the buffer effect of soil on nutrients is modeled into a chemical potential energy field by utilizing a variety Hooke's law, so that the system instability is quantified, and the problem of excessive fertilization caused by a hysteresis effect is solved. In the aspect of control decision, rolling horizon optimization is adopted, the potential energy burden serves as a penalty term to be introduced into a genetic algorithm, and blind topdressing under model mismatch is prevented by adaptively correcting and searching a spatial constraint boundary through a predicted residual error of a previous period. And finally, a smoothing instruction is generated through low-pass filtering, and accurate and steady regulation and control of rice soil nutrients are realized.

The invention discloses a preparation method and an application method of straw wet biochar for carbon sequestration and emission reduction in rice and wheat rotation. The preparation method comprises the specific steps of preparation and application of the straw wet biochar. The preparation method of the straw wet biochar comprises the steps of raw material preparation, low-temperature combustion, normal-temperature slow oxidation, electromagnetic radiation treatment, microwave heating and light wave sterilization, filtration and freezing and cold storage treatment. The method is mainly used for improving straw resource utilization of a rice and wheat system. The preparation process is low in energy consumption and little in smoke dust, carbon volatilization in the straw is reduced, and the content of fixed carbon in the straw is greatly increased. According to the specific application, the compound fertilizer is mixed with fertilizer according to a certain weight ratio of the compound fertilizer to plough layer rice soil and then applied at a time during rice planting. Wherein the nitrogen fertilizer is a mixture of quick-acting urea nitrogen and slow-release urea nitrogen, and the phosphate fertilizer and the potash fertilizer are conventional fertilizers. The fertilizer can promote the increase of gaps in rice soil and the water retention of wheat soil, reduces the emission of N2O, CO2 and CH4 in the rice and wheat planting process after being applied, improves the organic carbon content of soil, reduces the emission of greenhouse gas carbon (CO2), and promotes the increase of the crop rotation yield of rice and wheat.

The invention belongs to the technical field of rice cultivation and soil improvement, and particularly relates to a fertilization method for acid rice field soil improvement and application thereof. According to the method, an organic fertilizer is used for replacing 25% of conventional formula fertilizer (formula fertilizer containing nitrogen, phosphorus and potassium), and medium trace elements of magnesium, boron and zinc are applied in a combined manner; or medium trace elements such as magnesium, boron and zinc are additionally applied on the basis of application of a conventional formula fertilizer, and quick lime is added, so that the problem of aggravated soil acidification caused by application of a single chemical fertilizer is relieved, the rice yield is increased, meanwhile, the content of exchangeable acid in soil is reduced, and the total amount of exchangeable salt-based ions in the soil and the effective state content of elements are increased, thereby increasing the pH of the soil and improving the yield of the rice. The acid resistance of the soil is enhanced, and the acid soil is effectively improved.

The present application belongs to the technical field of soil environment regulation, and particularly relates to a paddy soil carbon fixation and emission reduction regulation method based on a ferrihydrite-organic matter complex. The ferrihydrite-organic matter complex is prepared through coprecipitation, the mineral combination degree of organic carbon in soil is improved, and the biological availability thereof is reduced, so as to alleviate the process of organic carbon decomposition and greenhouse gas emission mediated by microorganisms. Under the condition of redox fluctuation, the complex can maintain good structural stability, slow down the process of iron reduction and dissolution and the process of organic carbon release accompanying the same. In addition, the ferrihydrite as an electron acceptor can participate in the electron competition process under anaerobic conditions, so as to inhibit the production of methane to a certain extent. Therefore, the ferrihydrite-organic matter complex can realize the synergistic regulation of organic carbon stabilization and greenhouse gas emission reduction in paddy soil.

This invention relates to the field of agricultural environment and soil fertilizer technology, and in particular to a method for increasing paddy field yield and reducing N2O emissions by regulating the application rate of zero-valent iron. The method includes the following steps: at the early tillering stage of rice, zero-valent iron is mixed with tillering fertilizer and applied to the paddy field soil; the application rate of zero-valent iron is 20-50 mg / kg (dry soil basis). ‑1 The method involves applying booting fertilizer to the paddy soil during the early booting stage of rice, and irrigating throughout the entire rice growth cycle. This invention, by applying an appropriate amount of zero-valent iron in a single application on top of conventional fertilizer application, can synergistically achieve greenhouse gas emission reduction and increased grain yield, providing a feasible path for green production in paddy fields.

The invention belongs to the technical field of soil improvement, and discloses a soil conditioner with an acidified soil improving function and a preparation method thereof. The conditioner is prepared from biomass charcoal, peat containing humic acid, crab shells, eggshells, clamshells, bamboo charcoal, zeolite powder, kieselguhr, biogas residues, potassium fulvate, calcium magnesium phosphate fertilizer, animal waste and a microbial agent according to the mass percent. The invention relates to the technical field of soil improvement. The modifier realizes a multi-dimensional synergistic effect through alkaline neutralization, humus buffering, slow-release fertilizer supply and microbial activation, can significantly improve the pH value of acidified rice field soil after one-time application, increases 0.6-1.0 unit, effectively increases the contents of soil organic matters, total nitrogen, available phosphorus and available potassium, improves the soil structure and microbial activity, and improves the soil quality. And the yield of rice is increased by about 10% or above. The method is suitable for soil improvement and green agricultural production of southern acidic rice fields.

The utility model discloses a microorganism mediated reactor for regulating and controlling activity of cadmium and arsenic in rice field soil, and relates to the technical field of reactors. The microorganism mediated reactor for regulating and controlling the activity of cadmium and arsenic in the rice field soil comprises a heating box and a reaction box, the heating box is arranged on the outer side of the reaction box, a box cover is arranged at the top of the reaction box, a thermometer is arranged in the reaction box, a feeding port is formed in the outer wall of the box cover, and discharging ports are formed in the bottoms of the heating box and the reaction box. A motor is fixedly connected to the top of the box cover, a rotating shaft is connected to an output shaft of the motor, a mounting plate is fixedly connected to the outer wall of the rotating shaft, and stirring paddles are fixedly connected to the outer wall of the mounting plate. Through the combined design of the rotating ring, the scraping plate and the scraping ring, not only can mixing be assisted in the reaction process, but also adhesive substances attached to the inner wall of the reaction box can be automatically scraped off after the reaction is finished, so that the requirement and difficulty of manual cleaning are reduced, the maintenance efficiency of equipment is improved, and the service life of the equipment is prolonged.

The application relates to a driving rack simulating a paddy field soil tiller, which can adjust the deviation angles of driving impellers in all directions and can adjust the deviation angles of the driving impellers according to certain rules. The driving rack comprises a simulation groove, a driving mechanism and a walking mechanism. One end of a universal coupling is connected with the central shaft of the driving impeller, and the other end is connected with the output shaft of the transmission mechanism, so that the torque transmission between the transmission mechanism and the driving impeller under different angles can be realized. The angle adjusting mechanism comprises an adjusting sleeve sleeved on the central shaft and at least two telescopic adjusting mechanisms arranged in the circumferential direction of the adjusting sleeve. One end of the telescopic adjusting mechanism is spherically connected with the outer circumferential surface of the adjusting sleeve, and the other end is spherically connected with a fixed body. The telescopic adjusting mechanism comprises a driving module and a telescopic arm. The included angle between any two telescopic adjusting mechanisms is greater than 0 DEG and smaller than 180 DEG. The position adjustment of the adjusting sleeve in the plane perpendicular to the central shaft is realized through the telescopic cooperation of the telescopic adjusting mechanisms.

The invention discloses a nano zeolite coupled biomass charcoal-based slow release fertilizer suitable for acidic rice soil, a preparation method and application, and aims to solve the problems of low pH value, high methane emission flux, low nutrient utilization rate and the like of the acidic rice soil. By constructing a nano zeolite-biomass charcoal-slow release fertilizer-silicon fertilizer synergistic regulation system, the stability of organic carbon in soil and the slow release capacity of nutrients are improved by utilizing a composite material formed by embedding nano zeolite into pores of biomass charcoal; the alkalinity and physiological functions of the silicon fertilizer are used for improving the soil pH and the oxygen secreting capacity of the rice root system, and cooperative emission reduction is achieved through the two paths of inhibiting methane generation and promoting methane oxidation. Field test results show that the pH value of acidic rice soil can be increased by 0.5-1.5 units in a rice growing season, the accumulated emission of methane is reduced by 27%-40%, and the rice yield is increased by 12%-20%. The invention has the advantages of easily available raw materials, simple process, good operability and the like, and can realize the synergistic effect of acid soil improvement, carbon sequestration and emission reduction and crop yield and efficiency increase.

The invention discloses a Plusteria monocytogenes strain capable of reducing antibiotic resistance genes and promoting growth and application of the Plusteria monocytogenes strain. The strain is separated from rice soil, and is identified as Plusteria based on physiological and biochemical characteristics and 16S rRNA (ribosomal Ribonucleic Acid) analysis. The Plusteria bacteria provided by the invention have a remarkable reduction effect on antibiotic resistance genes in the organic fertilizer; pot experiment results show that the strain can effectively reduce abundance of antibiotic resistance genes at the upper part and the root part of the lettuce and can significantly promote growth of the lettuce.

The application discloses a fertilizer additive combination for improving red paddy soil aggregate and potassium availability and a method for applying the same, and belongs to the technical field of soil improvement and fertilization. The application realizes the improvement of the physicochemical properties of soil by compounding the fertilizer with functional additives and applying the fertilizer in layers and steps. The application has the characteristics of stable improvement effect, wide application range, simple operation, low cost and the like, and is suitable for the comprehensive improvement and sustainable utilization of the physicochemical properties of red paddy soil.

This invention discloses a method for improving tropical acidic soil based on deep tillage and synergistic use of alkaline materials, belonging to the field of agricultural soil improvement technology. This method targets strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0, and includes: deep tillage to a depth of 35-45 cm at a soil moisture content of 15%-20%, with complete return of crushed straw to the field; uniform application of a compound conditioner on the surface, consisting of: 80-120 kg / mu of quicklime, 80-120 kg / mu of biomass ash, and 150-250 kg / mu of calcium-magnesium soil conditioner, wherein the biomass ash is a byproduct of a biomass power plant, and the pH value is 9-10 under a water-to-soil ratio of 1:2.5; and rotary tillage to ensure that the coefficient of variation of the material distribution within the 0-20 cm soil layer is ≤ 12%. This invention utilizes deep tillage and the synergistic effect of three materials in a specific ratio to form a three-level buffer system of "rapid-release-long-lasting effect," achieving rapid improvement and long-term stability of soil pH. It solves the problems of soil compaction and short-lasting effect caused by the application of lime alone, while effectively alleviating deep acidification. It is particularly suitable for strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0.

The present invention relates to the technical field of soil function improvement, specifically a method for increasing carbon and expanding the capacity of paddy field soil based on biochar-based organic fertilizer. The method comprises: crushing the biomass raw material, pyrolyzing and cooling it to obtain biochar; immersing the biochar in a functional bacterial solution containing actinomycetes and bacillus for activation treatment to obtain modified biochar; mixing the modified biochar with decomposed straw for composting and fermentation to obtain organic fertilizers of different particle sizes; applying large-particle organic fertilizers to the deep soil, laying straw on the soil and covering it with soil, and applying small-particle organic fertilizers to the surface soil. The present application uses layered application to enable large-particle biochar to repair the deep soil structure and expand the carbon pool capacity. At the same time, the carbon-nitrogen synergistic metabolism driven by functional bacteria improves carbon stability, thereby achieving soil carbon increase and expansion while improving carbon sequestration efficiency, solving the contradiction between carbon sequestration and structural degradation and nutrient imbalance in traditional carbon increase and expansion technologies, and promoting the coordinated improvement of carbon sink function and agricultural productivity.

The invention belongs to the technical field of soil nitrogen fixation and environmental protection, and relates to a method for enhancing soil nitrogen fixation by using pure iron powder. A method for enhancing soil nitrogen fixation by using pure iron powder comprises the following steps: mixing rice soil and wheat straw powder to obtain a soil sample; the method comprises the following steps: mixing a soil sample with pure iron powder under a waterflooding condition; pure iron powder is added to regulate and control microbial ecology of rice soil biological nitrogen fixation, the soil iron reduction process is enhanced, the abundance of iron reducing bacteria in soil is improved, the relative contribution of iron reducing bacteria nitrogen fixation is enhanced to a certain extent, the diversity of iron reducing bacteria communities is reduced, the ecological niches of dominant groups are enhanced, and the ecological niches of the dominant groups are increased. Finally, the nitrogenase activity of the soil is enhanced, and the nitrogen fixation capacity of the rice soil is improved.

The present application relates to the field of soil improvement, and discloses a method and system for improving the soil texture structure of clay reclamation paddy soil, comprising: obtaining aeolian sand and organic material, respectively performing material pretreatment to obtain qualified aeolian sand and qualified organic material; performing ploughing and loosening treatment on the soil of a target area to obtain clean soil after ploughing and loosening treatment; mixing the qualified aeolian sand, the qualified organic material and the clean soil to obtain mixed soil, and performing permeability evaluation and optimization on the mixed soil to obtain qualified mixed soil; laying a ploughed bottom layer on the qualified mixed soil, repeatedly performing flooding-drying cycle treatment on the ploughed bottom layer, and then laying a ploughing layer on the qualified mixed soil, and performing flatness adjustment and flatness optimization on the ploughing layer to realize improvement of the soil texture structure.The present application can effectively improve the structure of reclamation paddy soil, improve the soil permeability and fertility, and provide a good soil environment for the growth of rice.

The invention belongs to the technical field of microbial agents for soil improvement, and particularly relates to application of a microbial agent for promoting carbon immobilization of a red soil rice field. The microbial inoculum is rhodococcus erythropolis or a synthetic microbial inoculum of rhodococcus erythropolis and pseudomonas aeruginosa, and after the rice seedlings are transplanted to red soil for 3 days, 25mL of suspension liquid of the related microbial inoculum is inoculated to the rhizosphere of each rice seedling. According to the application, the rhizosphere microenvironment is improved, input of plant photosynthetic carbon into soil is activated, meanwhile, the carbon utilization efficiency and conversion capacity of soil in-situ microbial communities are remarkably improved, accumulation of microbial source carbon is promoted, the molecular composition structure of soluble organic matter is remodeled, and finally formation and accumulation of a soil carbon library are promoted and stabilized.

This invention belongs to the field of pesticide technology, and more specifically relates to a pesticide composition for controlling soil-borne diseases of rice and its preparation method. The pesticide composition of this invention exhibits excellent control effects against rice bakanae disease, damping-off, and sheath blight, with a long-lasting effect, meeting the control needs throughout the entire rice growth cycle. Simultaneously, the introduction of an ecological regulator adjusts the soil pH to a suitable range, promoting the reproduction of beneficial microorganisms, which not only reduces the amount of chemical pesticides used but also significantly increases rice yield and reduces the risk of pesticide residues.

The present invention discloses a method for repairing light to moderate cadmium contaminated paddy soil using mugwort-rice intercropping, the steps are: 1) paddy preparation; 2) mugwort seedling cultivation; 3) rice variety selection and seedling cultivation; 4) establishing an intercropping system: mugwort with a plant height of about 15-20 cm and rice seedlings are transplanted into a prepared field, and a row of mugwort is intercropped with a row of rice, with a plant spacing of 18-25 cm × 18-25 cm; 5) water management; 6) above-ground part harvest. Among them, mugwort selects Qi mugwort produced in Qichun, Hubei. The present invention is simple, easy to operate and manage. Compared with single-crop mugwort or rice, intercropping improves the enrichment capacity of mugwort and rice to cadmium, and heavy metal removal efficiency is relatively high. Calculated by harvesting 2 crops per year, 4.1 g cadmium can be removed per mu of mugwort per year.

This invention belongs to the field of agricultural biotechnology and fertilizer preparation technology, and more specifically relates to a compound fertilizer for the prevention and control of soil-borne diseases in rice and its preparation method. The compound fertilizer for the prevention and control of soil-borne diseases in rice provided by this invention has a four-layer gradient structure, consisting of a core, a middle layer, an isolation transition layer, and an outer layer from the inside out. The core includes urea, potassium dihydrogen phosphate, potassium chloride, potassium silicate, and chitosan oligosaccharides; the middle layer is a drug-loaded biochar slow-release layer; the isolation transition layer is formed by cross-linking sodium alginate and phytic acid; and the outer layer is a microbial protective layer. Through the core-shell-membrane multi-layer gradient structure design, physical isolation and sequential release of each component are achieved. The isolation transition layer effectively blocks direct contact between chemical fungicides and beneficial microorganisms, solving the problem of fungicide-microorganism interaction; at the same time, this structure ensures the orderly release of nutrients, fungicides, and microorganisms, matching the growth and disease occurrence patterns of rice.

The invention relates to the field of coastal agriculture, in particular to shrimp shell fermentation liquor and a preparation method thereof. The preparation method comprises the following steps: drying fresh shrimp shells to obtain dried shrimp shells; based on the total volume of the culture medium, inoculating trichoderma fermentation strains into the fermentation culture medium for culturing; fermentation seed liquid is obtained; and mixing the dried shrimp shells without sterilization with the fermentation seed solution, sealing, and then fermenting. According to the technical scheme, the trichoderma harzianum is used for fermenting the shrimp shells, and the shrimp shell fermentation liquor is prepared from the unsterilized shrimp shells and multiple strains of the trichoderma harzianum in a synergistic manner, so that the degradation rate of the shrimp shells is optimal. When the shrimp shell fermentation liquor is applied to rice, the contents of rapidly available phosphorus, rapidly available potassium and organic matters in rice soil are increased, and the content of alkali-hydrolyzable nitrogen is remarkably increased, so that the growth of plant height, stem diameter, stem leaves and root systems of the rice is promoted.

The invention relates to the technical field of soil improvement, and particularly discloses a rice soil improver and a method for improving gleying rice soil. The rice soil improver provided by the invention comprises a component A and a component B, the component A is an organic-inorganic compound and comprises the following raw materials in parts by weight: 100-200 parts of kitchen waste fermentation products, 1-5 parts of slow-release calcium peroxide and 5-10 parts of a microbial agent I; wherein the slow-release calcium peroxide is prepared from the following raw materials in parts by weight: 100 parts of calcium peroxide, 70 to 80 parts of sepiolite and 10 to 15 parts of binder; the component B is microalgae gel beads and comprises the following raw materials: a microbial agent II, algae species and 2-5wt% of a sodium alginate solution. The rice soil improver provided by the invention can significantly improve the hardening and long-term oxygen deficit problems of gleying rice field soil, increase the effective fertility of the soil, promote the improvement of rice root activity and nutrient absorption, and finally increase the rice yield.

The invention belongs to the technical field of rice planting, and particularly relates to a method for reducing gleying type rice soil obstacles and increasing the rice yield. The method comprises the steps that before rice planting, drainage ditches are formed around a rice field; applying a base fertilizer; transplanting the seedlings to a seedling establishment period, and controlling a water layer of seedling protection water; fertilization is performed in the tillering stage and the jointing-booting stage respectively; meanwhile, during the milk ripe stage from the tillering stage to the grouting and fruiting stage, irrigation is conducted according to the lower limit of the soil water potential, when the lower limit of the soil water potential reaches-15 kPa, irrigation is conducted so that the water layer can be kept to be 10-15 mm, and circulation is conducted; from the wax ripening stage to the yellow ripening stage of the filling and fruiting stage, naturally drying until harvesting; wherein during the milk ripe stage from the tillering stage to the grouting and fruiting stage, when the depth of the water layer exceeds 5 cm due to rainfall, water is drained, so that the depth of the water layer is kept at most 5 cm. The invention provides a new choice for reducing the gleying type rice soil obstacles and increasing the rice yield.

The present application relates to the field of soil nutrient management, in particular to a rice soil nutrient synergistic regulation method and system based on big data analysis, first, data is collected through a multi-source sensing array, and a characteristic state space with time sequence memory is constructed. By introducing physical field theory, the buffer effect of soil on nutrients is modeled as a chemical potential energy field using the variable Hook's law to quantify system instability and solve the problem of excessive fertilization caused by hysteresis effect. In the control decision, the rolling time domain optimization is adopted, the potential energy burden is introduced into the genetic algorithm as a penalty term, and the search space constraint boundary is adaptively corrected through the prediction residual of the last period to prevent blind topdressing under model mismatch. Finally, a smooth instruction is generated through low-pass filtering to realize accurate and stable regulation of rice soil nutrients.

The invention discloses a rice cadmium pollution prediction method and system based on a multi-layer perceptron, and belongs to the field of cadmium pollution monitoring, and the method comprises the steps: obtaining rice soil sample data of various background regions, and marking positive and negative samples; the rice soil sample data is composed of multiple soil characteristics including the cadmium content; preprocessing the rice soil sample data; a multi-layer perceptron classifier is constructed and trained based on the preprocessed rice soil sample data, and the multi-layer perceptron classifier takes multiple soil features as input and takes whether rice cadmium exceeds the standard or not as an output target; the trained multi-layer perceptron classifier is used for conducting cadmium pollution prediction on rice soil data of the area to be predicted, and when the probability that rice cadmium exceeds the standard is predicted to be larger than a preset threshold value, it is indicated that rice cadmium has the standard exceeding risk; otherwise, the overproof risk of rice cadmium is low. According to the method, more comprehensive soil characteristics and an advanced MLP nonlinear classification model are introduced, so that the recognition capability of the rice cadmium exceeding standard sample is remarkably improved.

This invention discloses the application of the rice lead transporter gene OsNRAMP5 in reducing lead uptake in rice. Extensive experiments demonstrate that CRISPR / Cas9 editing to knock out the rice OsNRAMP5 gene significantly reduces Pb uptake by roots and accumulation in the aboveground parts. Under hydroponic conditions, increasing the Mn concentration in the nutrient solution significantly inhibits Pb uptake by rice roots. Furthermore, when rice is planted in Pb-contaminated paddy soil, the OsNRAMP5 knockout mutant shows a significant reduction in Pb accumulation in both grains and straw.

This invention provides a biological method for activating organic phosphorus in gleyed paddy soil, belonging to the field of soil improvement technology. The biological method involves introducing green algae into the paddy field after the rice seedlings have turned green, artificially cultivating a periclump biological community. This community utilizes the photosynthetic oxygen release from the periclump to increase the soil's redox potential and soil microbial activity, accelerating organic matter mineralization. Simultaneously, the method introduces phosphate-solubilizing bacteria into the paddy field after the rice enters the tillering stage, increasing the abundance and activity of phosphate-solubilizing bacteria in the soil. These bacteria then produce phosphatases, further accelerating organic phosphorus mineralization. The biological method provided by this invention effectively increases the abundance and activity of phosphate-solubilizing bacteria in gleyed paddy soil, thereby increasing the available phosphorus content in the soil.

The application discloses a method for promoting methane oxidation coupling iron reduction and nitrogen fixation process in paddy field soil, selects paddy field soil which has not applied or applied less nitrogen fertilizer for a long time, depletes organic carbon and nitrogen in the soil by flooding, adds ferrihydrite, enriches methane oxidation nitrogen fixation microorganisms and iron reduction microorganisms, and application of the method in enriching the methane oxidation nitrogen fixation microorganisms and the iron reduction microorganisms and in reducing paddy field methane emission and nitrogen fertilizer application. The application provides an environment-friendly technology, can enrich iron-dependent methane oxidation coupling biological nitrogen fixation related microorganisms, is suitable for paddy field soil with low iron oxide content and less nitrogen fertilizer application, has strong actual operability, can enhance biological nitrogen fixation of the paddy field, and couples the iron reduction process, so that the use of nitrogen fertilizer is reduced and pollution to the environment is reduced.

The present invention discloses a method for controlling greenhouse gas emissions from rice fields, comprising the following steps: applying basal fertilizer 4 to 6 days before transplanting, applying tillering fertilizer after the seedlings turn green, applying ear fertilizer 1 during the panicle differentiation period when the seedlings grow branches and ears, and applying ear fertilizer 2 2 to 3 days before the seedlings head; adding potassium humate bio-organic fertilizer at a rate of 30% pure nitrogen of chemical fertilizer as basal fertilizer, and applying tillering fertilizer 1, ear fertilizer 2, and ear fertilizer 2 to prevent and control greenhouse gas emissions from rice fields. The method comprises applying functional organic fertilizer and nitrification inhibitor to rice soil, thereby reducing chemical fertilizer input, lowering fertilizer costs, improving nitrogen fertilizer utilization, ensuring rice yield, regulating the population structure of soil nitrifying and denitrifying functional microorganisms, and significantly reducing greenhouse gas emissions from farmland soil.

The application belongs to the technical field of soil improvement, and particularly relates to a method for increasing the content of active organic carbon in paddy field soil. By adding crop straw, inorganic fertilizer and a mixture composed of algal species and bacterial species in an artificial carrier, the effect of reasonably optimizing the components of the artificial carrier is achieved, and then necessary nutrients are provided for the cultivation of periphyton; when the artificial carrier is appropriately put into the paddy field with the depth of 2-3 cm of the field surface water, the rapid growth of periphyton in the flooded environment is facilitated, and the photosynthetic carbon fixation and extracellular material secretion capacity of periphyton are simultaneously improved, and then the effect of increasing the active organic carbon in the paddy field soil is achieved.

The application discloses a rice film mulching transplanting device and method, relates to the technical field of rice transplanting, and solves the problem that the rice film mulching transplanting device is inconvenient to use and difficult to adjust the number of rice seedlings according to the size of a rice field, thereby reducing the rice seedling efficiency. The rice film mulching transplanting device and method comprise a vehicle frame, a plurality of rice storage mechanisms are movably arranged on one side of the vehicle frame, a rice transplanting mechanism is movably arranged on the outer side of each of the rice storage mechanisms, a turning mechanism is movably arranged on the two sides of the rice transplanting mechanism, and a film laying mechanism is movably arranged on the outer side of the rice transplanting mechanism. The film laying mechanism is arranged, the plastic film on the surface of a film laying roller can be laid on the ground through the rolling of the film laying roller, the device can realize automatic rice seedling and film mulching, and the loss of water in the soil of the rice is reduced.