158 results about "Reduced nitrogen" patented technology

The invention provides a fertilizer synergist for reducing nutrient loss and inhibiting nitrification and application of the fertilizer synergist. The fertilizer synergist is prepared from the following components in percentage by mass: 95 to 98 percent of carboxyl cross-linked modified montmorillonite, 0.05 to 0.1 percent of mannan oligosaccharide, 0.1 to 0.5 percent of mannan, 1 to 3 percent of polyaspartate and 0.5 to 2 percent of a nitrification inhibiting aid. According to the fertilizer synergist capable of reducing nutrient loss and inhibiting nitrification and the application of the fertilizer synergist, the fertilizer synergist serves as a plant nutrient loss control synergist and a nitrification inhibitor and can activate a crop stress resistance signal source, promote and induce synthesis of endogenous auxin in plants, root and growth, activate phosphorus and dissolve potassium, reduce nitrogen loss and improve the yield of the plants. The fertilizer utilization rate is improved.

The invention belongs to the technical field of agriculture, and particularly relates to a method for promoting growth and development of rice based on illumination and nitrogen. One of the purposes of the invention is to provide a method for promoting growth and development of rice based on illumination and nitrogen. The method comprises the following steps: providing cultivation conditions of illumination intensity of 600-800 [mu] mol.m <-2 >. S <-1 > and nitrogen concentration of 5.51-8.11 mM for rice in a tillering stage of the rice. By accurately applying a specific combination of illumination intensity and nitrogen concentration in the tillering stage of rice, efficient loading and long-distance transportation of photosynthetic products (especially cane sugar and the like) in phloem are promoted, and the photosynthetic products are guided to be more effectively and directionally distributed to developed library organs (such as fruits, grains or root systems); therefore, the transfer and circulation efficiency of carbon-nitrogen substances in plants is improved synergistically on the whole, the waste phenomenon of nitrogen redundancy or local lack and ineffective accumulation of photosynthetic products is reduced, and finally, an important physiological regulation basis is provided for remarkably improving the yield and quality of crops.

This invention belongs to the field of biomass subcritical fertilizer production, specifically relating to a mobile photovoltaic-powered subcritical fertilizer production system and its product application aimed at reducing nitrogen and phosphorus emissions, increasing efficiency, and resource-based disposal of high-moisture waste. It includes a solar preheating system, a photovoltaic power supply system, an auxiliary heating system, a hydrothermal reaction system, and a post-treatment system. The photovoltaic power supply system and auxiliary heating system are connected to the electrical load of the hydrothermal reaction system; the hydrothermal reaction system is connected to both the solar preheating system and the post-treatment system. This invention utilizes electrodialysis technology to desalinate the hydrothermal charcoal before returning it to the field. Through electrodialysis, the desalination rate of the charcoal reaches 45%-90%, and the conductivity of the desalinated charcoal is 1.40-6.75 mS / cm. The desalinated charcoal significantly increases crop yield; chlorophyll content increases by 25.5-67.5%, fresh weight increases by 18.5%-175%, and lettuce root length increases by 37.0%-98.2%. The high degree of desalination avoids the negative effects of salt stress on lettuce roots.

The invention discloses a method for efficiently reducing nitrogen and phosphorus in greenhouse vegetable soil based on morchella esculenta cultivation, and belongs to the technical field of soil improvement and edible fungus cultivation. In order to solve the problem of soil nitrogen and phosphorus eutrophication caused by long-term continuous cropping of a facility vegetable base, by screening a specific Morchella sextella strain and combining with optimized strain culture, inoculation and field management technologies, the absorption efficiency of the Morchella sextella on the soil nitrogen and phosphorus is remarkably improved. The method specifically comprises the following steps: soil nutrient detection and eutrophication evaluation, directional culture of strains, layered soil covering and sowing, accurate supplementation of exogenous nutrition bags, and dynamic monitoring of hypha growth and nutrient absorption. Experiments show that the content of total nitrogen (TN) in soil can be reduced by 11.27%-18.01%, the content of total phosphorus (TP) can be reduced by 2.72%-6.16%, the reduction amplitude of rapidly available phosphorus (AP) can reach 2.12%-11.35%, and the accumulation of nitrogen and phosphorus in the soil can be effectively relieved. According to the method, a dual absorption mechanism is formed through hypha metabolism and sporocarp, rapid reduction of greenhouse vegetable soil nutrients is achieved, and a new way is provided for sustainable development of greenhouse agriculture.

The invention provides a nitrogen fertilizer application method for reducing nitrogen deficiency of double cropping rice under full straw returning, and belongs to the technical field of biological agriculture. According to the method, the application proportion of the tillering fertilizer is increased under the straw returning condition, the optimal application scheme is obtained, the content of ammoniacal nitrogen and nitrate nitrogen in soil is remarkably increased, the nitrogen contending benefit of soil microorganisms and crops is effectively relieved, and effective tillering formation is promoted. The technical scheme provided by the invention is beneficial to establishment of a rice root system, remarkably promotes absorption and transfer of nitrogen in plants, and improves the number of effective ears of rice, thereby remarkably improving the rice yield.

The application discloses a kind of ammonia-free denitration agent for biomass boiler and its preparation method, and preparation raw materials include, by mass percentage: oxidizing agent 13-18%, solubilizer 0.5-2%, dispersing agent 0.5-1%, absorbent 15-19%, activated carbon slurry 8-15%, and the balance is water.5, the incorporation of denitration agent can effectively reduce the monitored values of nitrogen oxides at the inlet and outlet of flue gas, whether mother liquor or diluted product has the effect of reducing nitrogen oxides, the use method is simple, low in cost, convenient to use, has greater economic value and broad application prospect.

The application discloses a kind of organic waste composting methods for reducing nitrogen loss, belong to the technical field of organic waste resource utilization, in different stages of organic waste fermentation, calcium peroxide is added, on the one hand, can maintain the oxygen environment of heap system, inhibit denitrification;On the other hand, by regulating the pH environment in system, reduce ammonia volatilization.This double synergistic effect, continue to increase efficiency in the whole composting fermentation process, oxygen regulation breaks down the gaseous nitrogen loss caused by denitrification from the root, pH regulation effectively inhibits free ammonia volatilization, the two effects cooperate with each other, throughout the whole process, can realize the efficient nitrogen conservation of organic waste raw materials from fermentation start to stable decomposition, effectively solve the problems that existing nitrogen conservation technology is not good, cost is high, easy to cause secondary pollution and affect composting maturity etc..

The present application relates to the field of crop cultivation and soil improvement technology, and discloses a wheat-corn-sunflower-legume green manure crop rotation carbon fixation and water saving method suitable for arid irrigation areas, which comprises wheat planting, corn planting, sunflower planting and legume green manure planting. The present application replaces traditional flooding irrigation with high-frequency low-amount drip irrigation mode, combines with precise water supply according to the water requirement characteristics of each crop growth period, and avoids invalid irrigation. Meanwhile, through straw returning to field, soil water evaporation is reduced, and soil conservation capacity is improved. Moreover, the present application constructs a double carbon fixation path of straw returning to field and green manure turning, straw is crushed and returned to field, organic carbon is input into soil every year, legume green manure is turned and decomposed, and soil organic matter content is improved. The present application also reduces nitrogen fertilizer application through symbiotic nitrogen fixation of legume green manure and rhizobium, protects soil microbial activity, optimizes soil carbon cycle, relieves soil degradation, and improves long-term carbon fixation potential of soil.

This invention provides a gas-phase molecular absorption spectrometry-naphthylethylenediamine hydrochloride spectrophotometric method for determining total nitrogen in waste gas from stationary pollution sources. The method comprises the following steps: S1. Reacting the waste gas with an oxidant; S2. Using an absorbent, further reacting the waste gas after S1; S3. Collecting the oxidant after S1, pretreating it to reduce nitrogen-containing compounds to nitric oxide, and detecting the total nitrogen content I; S4. Collecting the absorbent after S2 to obtain the total nitrogen content II; S5. Summing the total nitrogen content I and total nitrogen content II to obtain the total nitrogen content in the current waste gas. This method enables accurate determination of total nitrogen in waste gas from stationary pollution sources.

The invention discloses Pseudomonas tai H1R1 and application thereof in treatment of mariculture tail water, the Pseudomonas tai H1R1 has excellent high salt resistance and aerobic denitrification function, can directly convert ammonia nitrogen and nitrate into nitrogen and efficiently remove nitrogen, the nitrogen removal rate can reach 80% or above, nitrogen load in water is reduced, the nitrogen removal efficiency is improved, and the application of the Pseudomonas tai H1R1 in treatment of mariculture tail water is improved. The problem of water eutrophication caused by nitrogen can be prevented; the system can survive and breed under various severe environment conditions and treat mariculture tail water. The pseudomonas tai H1R1 disclosed by the invention can utilize organic matters in mariculture tail water as a carbon source, so that the growth speed and the growth amount of bacteria are increased, and organic wastes in a culture process are reduced, so that the strain H1R1 can promote self growth while treating the mariculture tail water; and double benefits of environmental governance and resource cyclic utilization are realized.

This invention belongs to the field of microbial technology, specifically relating to a compound microbial fertilizer that synergistically regulates rhizosphere flora and nitrogen metabolism genes and its application. The microbial agent includes: Bacillus belye (… Bacillus velezensis ), Bacillus subtilis subsp. subtilis ( Bacillus subtilis subsp. subtilis ) and Linyi Streptomyces ( Streptomyces linyiensis Two or three of the following. The microbial agent provided by this invention has significant growth-promoting and nitrogen-fixing effects when applied to crops. It can maintain or even improve soil fertility and crop yield under the condition of reducing nitrogen fertilizer application by 30%, providing a green and efficient new solution for the implementation of "nitrogen reduction and efficiency enhancement".

The application discloses a kind of weathered marble waste stone powder resource utilization composition and application thereof, belong to environmental protection technical field.The weathered marble waste stone powder resource utilization composition includes marble waste stone powder, soil and microalgae biological fertilizer SynMiCom.The application mixes soil in marble waste stone powder and then adds SynMiCom, which can significantly reduce the pH of marble waste stone powder, significantly increase the content of reduced nitrogen in marble waste stone powder, significantly increase the content of available phosphorus in marble waste stone powder, significantly increase the enzyme activity in marble waste stone powder, and significantly promote the growth of peppers in marble waste stone powder.The application utilizes the long-term weathered marble waste stone powder, which has low cost and high application value.

The invention belongs to the technical field of microorganisms, and particularly relates to a composite microbial fertilizer capable of cooperatively regulating rhizosphere flora and nitrogen metabolism genes and application of the composite microbial fertilizer, and the microbial agent comprises two or three of bacillus velezensis, bacillus subtilis subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. Subsp. When the microbial agent provided by the invention is applied to crops, the microbial agent has remarkable growth promotion and nitrogen fixation synergistic effects, can maintain and even improve soil fertility and crop yield under the condition of reducing application of a nitrogen fertilizer by 30%, and provides a green and efficient new solution for implementation of nitrogen reduction and synergistic effects.

The application discloses a preparation method of organic garbage carbon source by composite enzyme combined with nitrogen precipitation. Firstly, enzyme pretreatment is performed on organic garbage materials, starch enzyme, cellulase and hemicellulase are used in cooperation to make macromolecular structure of organic matter be broken, so that preliminary release and partial dissolution of carbon source substances are realized; subsequently, sodium tetraphenylborate is added in the pretreatment system to selectively precipitate nitrogen substances in the solution, and centrifugal separation is performed to reduce nitrogen content of the system; on the basis, potassium persulfate and iron substances are added into the obtained suspension liquid to build a Fenton-like reaction system, residual organic macromolecules are further oxidized and degraded, and the structure is optimized, so that availability and stability of the carbon source are improved. In the whole process, each link cooperates, so that the organic garbage can be efficiently converted into high-quality carbon source with high C / N ratio and COD value, and can be used in a sewage treatment system as stable external carbon source.

The present invention relates to the technical field of granary modification, and discloses an automatic granary pressure regulating system, comprising a main gas pipe installed on the inner wall of the granary, a plurality of pressure regulating devices, the pressure regulating devices comprising a housing and a pipe assembly; the main gas pipe is provided with a plurality of branch pipes, the outer ends of the pipe assemblies in each pressure regulating device being connected to corresponding branch pipes; a piston assembly is provided within the pipe assembly; when the air pressure inside the granary is greater than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the outer space; when the air pressure inside the granary is less than the air pressure outside the granary, the piston assembly moves along the pipe assembly toward the inner space; when the air pressure inside the granary is equal to the air pressure outside the granary, the piston assembly stops moving. The present invention can conveniently and stably regulate the air pressure inside the granary, prevent or reduce the exchange of gas inside the granary with gas outside the granary, thereby preventing or reducing nitrogen leakage within the granary, thereby maintaining a stable nitrogen concentration and improving the insecticide effect.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

The invention discloses trichosporon arystachys capable of reducing ammonia nitrogen and nitrite and application of the trichosporon arystachys. The saccharomycetes are named as Trichosporonashii JM-1, and the preservation number of the saccharomycetes is GDMCC No: 64448. The invention further discloses a preparation method of the saccharomycetes. The Saccharomyces cerevisiae grows well in a high-concentration ammonia nitrogen and nitrite environment, is high in nitrogen degradation efficiency and good in environmental adaptability, can be used as a functional strain for improving water quality, deodorizing farms, deodorizing garbage yards and the like, is applied to multiple places, reduces nitrogen accumulation, protects the environment, has certain degradation capability on cellulose, and can be used as a functional strain for improving the water quality, deodorizing the farms, deodorizing the garbage yards and the like. The method has great application potential in livestock and poultry aquaculture and environmental protection.

The utility model relates to the technical field of packaging equipment, and discloses a bonding track nitrogen protection sealing device which comprises a workbench, a placement groove is formed in the workbench, a frame is arranged in the placement groove, a plurality of bonding units are arranged on the frame, and a first cover plate and a second cover plate are arranged above the frame. One end of the first cover plate is connected with a bonding module, the first cover plate is provided with a working window, the second cover plate is connected with a spring, one end of the second cover plate is slidably connected with the workbench, and the first cover plate and the second cover plate are mutually decoupled; in the whole bonding process, the sealing and shielding effects are achieved through the first cover plate and the second cover plate, nitrogen loss caused by excessive loss of nitrogen can be avoided, other driving structures do not need to be additionally arranged to drive the cover plates to move, the overall structure is simple, the nitrogen loss can be reduced, meanwhile, the structure of equipment is simplified, and the cost is reduced. And the use cost of equipment is reduced.

The utility model discloses an energy-saving and consumption-reducing nitrogen production system which comprises an air filter, an air compressor, an air cooling tower, a first molecular sieve, a second molecular sieve, an electric furnace, a fractionating tower and a heat exchanger, the air filter is connected with the air compressor, and the output end of the air compressor is connected with the high-temperature gas input end of the heat exchanger; the low-temperature gas input end of the heat exchanger is connected with the fractionating tower, the high-temperature gas output end of the heat exchanger is connected with the air cooling tower, the low-temperature gas output end of the heat exchanger is connected with the electric furnace, the first molecular sieve is connected with the second molecular sieve, and the air cooling tower is connected with the first molecular sieve and the second molecular sieve through pipelines. The fractionating tower is connected with the first molecular sieve and the second molecular sieve through pipelines, and the second molecular sieve is connected with the electric furnace. According to the utility model, the electric quantity consumption of the electric furnace is reduced, the electric quantity consumption of the air cooling tower is reduced, the service life of the binding post is prolonged, and unnecessary consumption is avoided.

The invention discloses a rice cultivation method without nitrogen fertilizer application, which comprises the following steps: laying a detachable aeration perforated pipe with a specific specification in a rice field, starting a direct-current aerator by utilizing power supply of a solar panel, carrying out intermittent aeration stirring to uniformly mix water, inputting nitrogen, keeping the dissolved oxygen concentration not more than 0.5 mg / L, and creating a suitable environment for nitrogen-fixing bacteria. 6-10 days before rice planting, nitrogen-fixing flora of clostridium pasteurianum is subjected to enrichment culture, and nitrogen is fixed by the nitrogen-fixing flora. During planting, the water depth of the rice field is controlled to be 5-15 cm, the nitrogen-fixing flora concentration is adjusted for nitrogen supply according to different growth cycle requirements of rice, and no nitrogen fertilizer is added in the whole process. According to the method, the rice grows by using nitrogen fixed by the nitrogen-fixing bacteria as a nitrogen fertilizer, and the nitrogen fertilizer does not need to be additionally applied, so that the rice planting cost is greatly saved, and the pollution of nitrogen to soil, water and air is also reduced; in addition, the solar panel is used for providing electric energy, and energy-consumption-free operation of the whole rice nitrogen-fertilizer-free cultivation system is achieved.

The application discloses a sewage purification device based on an AOA process and particularly relates to the technical field of sewage purification, comprising a treatment tank arranged on the ground and used for treating sewage, two auxiliary components arranged on the upper part of the inner surface of the treatment tank, a stirring component one arranged below the auxiliary component on the rear side, a mixing component arranged on the middle part of the inner surface of the treatment tank, and a stirring component two arranged on the front side of the inner surface of the treatment tank. The application forms a nearly sealed anaerobic reaction space through cooperation of the intercepting plate one and the intercepting plate two, realizes a low-oxygen environment required by anaerobic reaction, avoids penetration of external oxygen to destroy anaerobic conditions, realizes continuous air suction and gas collection of the anaerobic zone and the anoxic zone through cooperation of the sliding plate, the vertical plate and the air bag, reduces the oxygen content above the anaerobic zone to guarantee reaction conditions, recycles methane generated by the anaerobic reaction, reduces nitrogen residue in the anoxic zone, and solves the problems of methane leakage pollution and sludge floating caused by nitrogen adhesion to sludge.

The utility model discloses a farmland discharge outlet capable of reducing nitrogen and phosphorus non-point source pollutant discharge, which comprises a percolation dam arranged at the position of a farmland ridge discharge outlet and an adjustable waterproof assembly, the percolation dam is filled with a permeable purification material, and the adjustable waterproof assembly is arranged on one side, facing the farmland, of the percolation dam; the adjustable waterproof assembly can adjust the water level height of the farmland so as to meet the water demand requirements of aquatic or humid crops in different growth periods. The device has the functions of water retention in a dry season, farmland runoff purification in a rainwater period or a drainage period and flood regulation and storage, and the height of the farmland water level can be adjusted through the adjustable waterproof assembly according to the water demand requirements of aquatic or hygrophilous crops in different growth periods. The percolation dam body can purify runoff generated by conventional rainfall or runoff at the front end of rainstorm or runoff generated during drainage to a certain degree by filling permeable purification materials, the paddy field can serve as a temporary storage pond in the rainstorm period to slow down the runoff water drainage rate, the downstream flood intensity is relieved, and the effect of flood storage is achieved.

The invention relates to the technical field of agricultural resources and environment, in particular to a fertilization method for reducing nitrogen loss of an apple orchard. The apple branch biochar is prepared from the apple orchard pruning waste, and resource utilization of the waste is achieved. Through the synergistic effect of the apple branch charcoal, dicyandiamide and the reduced nitrogen fertilizer, the loss of nitrate nitrogen in soil is obviously slowed down, the conversion of ammonium nitrogen is inhibited, and a nitrogen cycle functional microflora is regulated, so that the application amount of the nitrogen fertilizer is reduced, the utilization rate of the nitrogen fertilizer is improved, and the environmental pollution is reduced; the growth of apple plants can be obviously promoted, the root configuration is improved, and the root activity and the nitrate reductase activity are improved.

The invention discloses a nitrogen and phosphorus adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental protection and resource utilization. The preparation method comprises the following steps: uniformly mixing coal gangue powder with NaOH, calcining, adding water, carrying out hydrothermal reaction with NaAlO2, washing, centrifuging, and drying to obtain CGMS; the preparation method comprises the following steps: preparing a sodium alginate solution, adding CGMS into water to obtain a CGMS solution, adding a sodium alginate solution into the CGMS solution, then adding a NiCl2 solution, and finally adding a glutaraldehyde solution to obtain a mixed solution, stirring, centrifuging, washing and drying to obtain SA-CGMS; and finally, mixing the sludge with SA-CGMS, drying, carrying out ball milling on the dried material, screening, granulating into balls, drying, and finally calcining to obtain the nitrogen and phosphorus adsorbent. The nitrogen and phosphorus adsorbent prepared by the invention has the nitrogen and phosphorus resistance and control of 90% or more, and can significantly reduce the leaching loss of nitrogen and phosphorus. And after being continuously used for 6-8 years, the nitrogen-phosphorus adsorbent is applied to the permeable control layer, so that the soil fertility of the barren farmland in the karst region can be increased, carbon sequestration can be realized, and heavy metals and antibiotic pollutants in a plough layer can be adsorbed.

The application discloses a method for wastewater denitrification by ion beam superposition biological method, comprising the following steps: (1) air ionization is used to generate charged air particles, and the charged air particles are dissolved into industrial wastewater after being treated by a magnetic field to obtain solution A; the air ionization and the magnetic field treatment are performed by an anion beam device; the magnetic field treatment is a combined frequency magnetic field treatment; (2) the solution A obtained in the step (1) is placed into a wastewater denitrification biochemical tank to perform microbial treatment; the microbial treatment comprises microbial nitrification treatment and denitrification treatment. The method for wastewater denitrification by ion beam superposition biological method can selectively strengthen the action of microbial population and rapidly activate microorganisms by providing charged air particles and biological electromagnetic waves in wastewater; meanwhile, the method can provide the required electrons for reduction of nitrite nitrogen to nitrogen, realize the functions of simultaneous nitrification and denitrification in the case of lacking carbon source, improve the ammonia nitrogen removal efficiency and total nitrogen removal efficiency of low C / N ratio wastewater, and significantly reduce the operation cost.

This invention provides a method for preparing high-nitrogen-content vanadium-containing steelmaking additive silicon vanadium ferronitride, comprising the following steps: 1) mixing vanadium oxide and a carbon source at a C / O molar ratio of 0.8-1, briquetting the mixture, and then placing it in a nitrogen atmosphere for a reduction nitriding reaction at 1100-1400 °C to obtain a one-step product; 2) crushing the one-step product obtained in step 1), mixing it with a silicon source and an iron source, briquetting the mixture, and then placing it in a nitrogen atmosphere for densification treatment at 1300-1500 °C to obtain high-nitrogen-content silicon vanadium ferronitride, wherein the silicon source is ferrosilicon and / or silicon. This invention can obtain high-purity, uniformly composed, and highly dense silicon vanadium ferronitride, improving the automation level and continuous production capability of the production process.

The invention provides a method for improving the utilization rate of nitrogen fertilizer and application thereof. According to the method disclosed by the invention, the effects of expanding the capacity and improving the efficiency of the soil nitrogen are achieved through measures such as appropriate organic substitution, accurate water control of the rice field, timely straw coverage and limestone neutralization, and key technologies of soil nitrogen fertilization and efficient nitrogen fertilizer utilization such as classified nitrogen application, recarburization and nitrogen fixation, water retention and nitrogen saving, acid regulation and nitrogen promotion are created; therefore, the nitrogen fertilizer utilization rate is increased, and the crop yield is increased. By coating the fertilizer and the like, the slow release effect is achieved, the nitrogen loss is further reduced, and the nitrogen fertilizer utilization rate is increased.

The invention provides a geotrophic bacterium SG265 and application thereof, and belongs to the technical field of microbial agents. The geotrophic bacteria SG265 disclosed by the invention is preserved in Guangdong Microbial Culture Collection Center on May 7, 2025, the preservation number is GDMCC No: 66266, and the geotrophic bacteria SG265 is named as Geotalea sp. In taxonomy. The terrestrial nutrient bacteria SG265 are anaerobic nitrogen-fixing bacteria, have iron reduction and nitrogen fixation functions at the same time, can reduce nitrogen into nitrogen fertilizer available for crops under the anaerobic condition, can greatly increase the content of available nitrogen in soil, can effectively promote rice growth, can reduce the application amount of the nitrogen fertilizer, can reduce environmental pollution, and can improve the yield of rice. The method has a good application prospect in agricultural production.

The application discloses a method for reducing nitrogen and phosphorus loss of slope farmland, which comprises the following steps: step 1, determining a slope farmland catchment area and estimating nitrogen and phosphorus loss load of a SWAT model; step 2, designing a drainage ditch, a rain and sewage diversion device and a diversion pipe according to the estimation result of the model; and step 3, designing a vegetation retention pool according to the runoff of the slope farmland; the vegetation retention pool effectively reduces the loss of nitrogen and phosphorus of the slope farmland through the absorption of plants, the filtration of sediments and the retention effect of water flow. The method can realize diversion treatment of small rain and high-concentration nitrogen and phosphorus runoff in the early stage of heavy rain, and the nitrogen reduction rate of the slope farmland drainage reaches 70-80%, and the phosphorus reduction rate reaches 80-90%.

This application provides the use of the MsGRF1c gene in regulating alfalfa nodule senescence, nitrogen fixation efficiency, and biomass. This application demonstrates that the MsGRF1c gene can delay alfalfa nodule senescence, improve nodule nitrogen fixation efficiency, and thereby increase plant biomass under low-nitrogen conditions. This new discovery complements the regulatory mechanism for nodule senescence in legumes and has important utility in reducing nitrogen fertilizer application.