60 results about "Paddy soils" patented technology

The invention discloses a method for repairing arsenic-cadmium combined polluted rice field soil, which comprises the following steps of: reducing the redox potential Eh value of the soil to-100 to-300mV by controlling the height of a flooded water layer of the polluted soil and adding a reducing agent, reducing arsenic in the soil into trivalent arsenic, and simultaneously constructing an indigenous microbial community with high arsenic methylation capability; oxidizing by draining and drying, methylating trivalent arsenic by indigenous microbial communities, and gradually volatilizing arsenic through methylation; and applying a carbon-based functional biological membrane mainly comprising a cadmium passivation flora to stably passivate cadmium. According to the method, the arsenic methylation capacity of microorganisms is improved by precisely regulating and controlling the Eh value, in-situ passivation of cadmium is enhanced through the synergistic effect of the carbon-based carrier and the composite flora, synchronous enhancement of arsenic methylation volatilization and cadmium biological membrane passivation is achieved, the difficulty that an arsenic and cadmium pollution treatment technology is'helpful 'is converted into an acting point of technical breakthrough, and the method is suitable for large-scale popularization and application. The arsenic and cadmium co-treatment of the combined polluted soil is realized.

The invention relates to the technical field of soil function improvement, in particular to a rice field soil recarburization and capacity expansion method based on a charcoal-based organic fertilizer. The method comprises the following steps: crushing a biomass raw material, pyrolyzing and cooling to obtain biochar; immersing the biochar in a functional bacteria solution containing actinomycetes and bacillus for activating treatment to obtain modified biochar; mixing the modified biochar and decomposed straw, composting and fermenting to obtain organic fertilizers with different particle sizes; the large-particle-size organic fertilizer is applied to deep soil, the soil is covered with soil after straw is laid on the soil, and the small-particle-size organic fertilizer is applied to surface soil. Through layered application, the large-particle-size biochar repairs the deep soil structure and expands the carbon storage capacity, and meanwhile, the carbon stability is improved through carbon-nitrogen synergistic metabolism driven by functional bacteria, so that the carbon immobilization efficiency is improved, meanwhile, soil recarburization and expansion are achieved, the contradiction between carbon sequestration and structure degradation and nutrient imbalance in a traditional recarburization and expansion technology is solved, and the soil recarburization and expansion efficiency is improved. Synergic improvement of a carbon sink function and agricultural productivity is promoted.

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 relates to a rice soil in-situ liquid extractor, and belongs to the technical field of agricultural liquid sampling, the rice soil in-situ liquid extractor comprises a barrel body and a filter assembly arranged on the barrel body, a plurality of through holes are formed in the side, close to the bottom, of the barrel body in a surrounding mode at equal intervals in the center line direction, and the filter assembly comprises a filter pipe coaxially arranged on the barrel body in a sleeving mode; the through holes in the barrel body are used in cooperation with the filtering pipe and the shielding pipes of the filtering assembly, the shielding pipes are used for wrapping the filtering pipe, the shielding pipes are moved in the detection process, the shielding pipes are moved in the detection process, and therefore the detection efficiency is improved, and the detection efficiency is improved. By means of the structure, the filter pipe is partially exposed, so that liquid in rice soil is separated from the soil through the exposed part of the filter pipe, the separated liquid penetrates through the through hole to enter the barrel body to achieve extraction, the shielding pipe is gradually moved to achieve section-by-section utilization of the filter pipe, the separation effect of soil particles and the liquid is guaranteed, and the liquid extraction effect is improved.

The invention discloses a reduction and remediation method for arsenic pollution of rice field soil. The reduction and remediation method comprises the following steps: S1, rice seedling raising; s2, 1-2 weeks before rice transplanting, modified biochar is added into the arsenic-polluted rice field soil to be repaired, and then flooding treatment is conducted; s3, after 1-2 weeks, rice seedlings are transplanted in shallow water, and after rice seedlings turn green in 3-5 days, water strengthening management is conducted; s4, in the early heading stage of the rice, harvesting straw on the upper portion of the rice, separating the straw from the field, ploughing soil, deeply plowing, crushing and irrigating the soil, enabling roots to float on the water surface, and collecting all the roots and separating the roots from the field; s5, the field is leveled, water is drained till the surface layer contains shallow water, and the steps S2 to S4 are repeated. According to the method, the microorganisms are loaded on the biochar and are combined with water to strengthen and manage plant absorption, in the heading stage of the rice, the overground straw and the underground root system which are rich in arsenic are integrally removed and separated from the field, and periodic repeated operation is combined, so that the total amount of arsenic in the soil is substantially reduced.

The invention belongs to the technical field of greenhouse gas emission reduction, and provides a method for reducing greenhouse gas emission of rice soil. The method comprises the following steps that a microbial electrochemical breather pipe is vertically inserted into rice field soil, the microbial electrochemical breather pipe is composed of a carbon rod and a carbon felt, the carbon rod is vertically placed and extends out of the surface of the soil, and the carbon felt is buried in the soil; a water layer is arranged on the soil surface of the rice field, the waterflooding environment of rice soil is simulated, and cultivation is conducted in the waterflooding environment. The carbon rods are used for inducing electron transfer in the rice field soil, transmission of electrons from the bottom soil to the surface soil is accelerated, the electron transfer mode effectively inhibits the methane production process of the bottom anaerobic zone, and the methane production dynamics is changed by adjusting the competition of soil microorganisms, so that the methane production efficiency is improved. The method is different from a traditional method for inhibiting methane emission through chemical additives or exogenous microorganisms, and methane inhibition in the natural soil environment is achieved through physical action.

The invention relates to the technical field of soil remediation, and particularly discloses an adsorption material, a preparation method thereof and a method for removing heavy metal cadmium in a paddy field, and the preparation method comprises the following steps: (1) treating hollow glass beads with an alkali solution for later use; (2) adding sodium alginate into pure water, and stirring to obtain a sodium alginate solution with the mass fraction of 1-2.5%; and (3) adding the hollow glass beads treated in the step (1) into a sodium alginate solution, uniformly stirring to obtain a hollow glass bead-sodium alginate solution, then sucking the hollow glass bead-sodium alginate solution by using an injector, dropwise adding the hollow glass bead-sodium alginate solution into a 0.1-0.5 mol / L calcium chloride solution, standing for 12-24 hours, filtering, washing and freeze-drying to obtain the adsorption material. The heavy metal cadmium in the rice soil can be effectively removed, secondary pollution cannot be caused, and the adsorption material is beneficial to recycling.

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 invention discloses a method for extracting plant available arsenic in rice field soil, which comprises the following steps: naturally air-drying soil, grinding and sieving to obtain a soil sample, weighing the soil sample, adding deionized water to enable the soil moisture content to be 35-110% of the maximum water-holding capacity of the soil, balancing at room temperature for 12-48 hours, adding nitric acid, oscillating and extracting at constant temperature, and filtering to obtain an extracting solution; and measuring the concentration of arsenic in the extracting solution, and calculating the content of the plant available arsenic in the measured soil sample according to the measured mass of the soil sample and the measured concentration of arsenic in the extracting solution. The method is easy and convenient to operate and low in cost, the change characteristics of the plant effectiveness of arsenic in the rice field soil in a field water management mode can be well reflected, and the measured plant effective state arsenic content in the rice field soil and the rice arsenic content have a better linear correlation relation.

The utility model relates to the field of heavy metal copper tachymeters, and particularly provides a paddy soil heavy metal copper tachymeter. The heavy metal copper tacheometer comprises a detection assembly and a soil pretreatment assembly, the detection assembly comprises a base, a heavy metal copper tacheometer body is arranged at the top end of the base, a lifting frame is located between a drying bin and the heavy metal copper tacheometer body, and a screening frame is arranged at the top end of the lifting frame. The method solves the problem that the detection accuracy is influenced by other substances contained in a soil sample which needs to be pre-treated by drying, screening, grinding and the like before detection because the rice field soil contains more moisture and impurities and the detection accuracy is not influenced by other substances contained in the sample when the heavy metal copper tachymeter performs spectral irradiation; however, most of current heavy metal copper tachemeters do not have a soil sample pretreatment structure, so that the detection efficiency needs to be further improved, and the efficiency of the detection work is 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 relates to a method for regulating the amount of artificial humic acid applied based on a potted rice water and fertilizer test, and belongs to the field of agricultural technology. The invention aims to solve the problem that there is a lack of research on the influence of the coupling of irrigation mode and artificial humic acid on the carbon fixation of rice, and the content of artificial humic acid cannot be flexibly regulated. Step 1: Plant multiple rice plants in two ways in the same test box, add different amounts of artificial humic acid to the rice in the two ways, and measure the carbon isotope content in the soil of each rice plant; the amount of artificial humic acid added to each rice plant under the two ways and the carbon isotope content in the soil are respectively used as two data sets; Step 2: Use the two data sets to train two models respectively to obtain two trained models; Step 3: Input the carbon isotope content in the soil to be tested into the corresponding trained model to predict the corresponding amount of artificial humic acid added. The present invention is used to regulate the amount of artificial humic acid added.

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 invention discloses a rice precise cadmium-resistant nano bamboo charcoal compound and a preparation method thereof, and belongs to the technical field of soil improvement, and the preparation method comprises the following specific steps: 1) preparing nano bamboo charcoal; 2) preparing an organic material; (3) preparing a ph conditioner; and (4) uniformly mixing the prepared nano bamboo charcoal, the organic material and the ph conditioner in proportion. Different conditioner formulas are produced according to the pH value and the organic matter content of rice field soil, then the nano bamboo charcoal is matched, accurate cadmium reduction of rice in different types of cadmium-polluted cultivated lands is achieved, meanwhile, the application amount of the conditioner is reduced, the cadmium reduction cost is reduced, and the method is suitable for large-scale popularization and application. The synergistic effect of cadmium reduction and high yield of rice is achieved.

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.

The invention relates to a seedling-pushing and seedling-swinging planting device for paddy field seedlings, which belongs to agricultural machinery. A seedling-pushing lever is hingedly installed on the upper end of a claw frame through an upper pin shaft so as to be able to swing left and right, a return torsion spring sleeve is arranged on the upper pin shaft, two ends of the return torsion spring are respectively contacted and positioned with the seedling-pushing lever and the claw frame, a seedling-pushing plate is arranged in a fork of the seedling pot so as to be able to slide left and right, a left and right end of a seedling-pushing rod is hingedly connected to the lower part of the seedling-pushing lever through a lower pin shaft, a right end of the seedling-pushing rod is connected with the seedling-pushing plate, a push rod seat is fixedly arranged on the right side of the claw frame and above the seedling-planting claw plate, and the push rod seat is in contact or non-contact with the upper end of the seedling-pushing lever. The device adopts a compulsory seedling-pushing structure to plant the paddy field seedlings in the paddy field soil through swinging. The device has the characteristics of novel, unique and reasonable structure, good seedling-planting operation quality, high efficiency, strong ability to adapt to land conditions and reliable use.

The invention discloses a qualitative and semi-quantitative analysis device for methyl antimony in a gas phase and a liquid phase. The device comprises a gas sample preparation device used for converting a liquid methyl antimony compound into a gaseous methyl antimony compound through a hydrogenation reaction; the methyl antimony low-temperature trapping device comprises a liquid nitrogen cooled U-shaped chromatographic column and is used for trapping and cold focusing gaseous methyl antimony; the gas chromatography-mass spectrometry system is used for separating and detecting the methyl antimony compound; wherein a gaseous methyl antimony compound generated by the gas sample preparation device is input into the methyl antimony low-temperature trapping device, is heated and then is input into the gas chromatography-mass spectrometry system for qualitative and semi-quantitative analysis. The device disclosed by the invention can be used for simultaneously analyzing gas-phase and liquid-phase samples (such as supernate and headspace gas of a rice field soil enrichment culture), detecting differential distribution of MMSb and DMSb in a liquid phase and TMSb in a gas phase, and providing comprehensive data support for researching migration and transformation of methyl antimony in an environmental medium.

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.